8290011: IGV: Remove dead code and cleanup

Reviewed-by: chagedorn

src/utils/IdealGraphVisualizer/Bytecodes/src/main/java/com/sun/hotspot/igv/bytecodes/BytecodeNode.java

@@ -59,9 +59,7 @@ public class BytecodeNode extends AbstractNode {
         List<InputNode> nodeList = selector.selectMultiple(matcher);
         if (nodeList.size() > 0) {
             nodes = new LinkedHashSet<>();
-            for (InputNode n : nodeList) {
+            nodes.addAll(nodeList);
-                nodes.add(n);
-            }
             displayName += " (" + nodes.size() + " nodes)";
         }
 
@@ -88,12 +86,12 @@ public class BytecodeNode extends AbstractNode {
 
     @Override
     public Action[] getActions(boolean b) {
-        return new Action[]{(Action) SelectBytecodesAction.findObject(SelectBytecodesAction.class, true)};
+        return new Action[]{SelectBytecodesAction.findObject(SelectBytecodesAction.class, true)};
     }
 
     @Override
     public Action getPreferredAction() {
-        return (Action) SelectBytecodesAction.findObject(SelectBytecodesAction.class, true);
+        return SelectBytecodesAction.findObject(SelectBytecodesAction.class, true);
     }
 
     @Override

src/utils/IdealGraphVisualizer/Bytecodes/src/main/java/com/sun/hotspot/igv/bytecodes/BytecodeViewTopComponent.java

@@ -29,12 +29,11 @@ import com.sun.hotspot.igv.data.InputGraph;
 import com.sun.hotspot.igv.data.services.InputGraphProvider;
 import com.sun.hotspot.igv.util.LookupHistory;
 import java.awt.BorderLayout;
-import java.io.Serializable;
 import org.openide.ErrorManager;
 import org.openide.explorer.ExplorerManager;
 import org.openide.explorer.ExplorerUtils;
 import org.openide.explorer.view.BeanTreeView;
-import org.openide.util.*;
+import org.openide.util.NbBundle;
 import org.openide.windows.TopComponent;
 import org.openide.windows.WindowManager;
 
@@ -62,7 +61,7 @@ final class BytecodeViewTopComponent extends TopComponent implements ExplorerMan
 
         treeView = new BeanTreeView();
         treeView.setRootVisible(false);
-        this.add(BorderLayout.CENTER, treeView);
+        add(BorderLayout.CENTER, treeView);
         associateLookup(ExplorerUtils.createLookup(manager, getActionMap()));
     }
 
@@ -109,11 +108,6 @@ final class BytecodeViewTopComponent extends TopComponent implements ExplorerMan
         LookupHistory.removeListener(InputGraphProvider.class, this);
     }
 
-    @Override
-    public Object writeReplace() {
-        return new ResolvableHelper();
-    }
-
     @Override
     protected String preferredID() {
         return PREFERRED_ID;
@@ -156,15 +150,6 @@ final class BytecodeViewTopComponent extends TopComponent implements ExplorerMan
         manager.setRootContext(rootNode);
     }
 
-    static final class ResolvableHelper implements Serializable {
-
-        private static final long serialVersionUID = 1L;
-
-        public Object readResolve() {
-            return BytecodeViewTopComponent.getDefault();
-        }
-    }
-
     /** This method is called from within the constructor to
      * initialize the form.
      * WARNING: Do NOT modify this code. The content of this method is

src/utils/IdealGraphVisualizer/Bytecodes/src/main/java/com/sun/hotspot/igv/bytecodes/MethodNode.java

@@ -42,7 +42,7 @@ public class MethodNode extends AbstractNode {
 
         private InputMethod method;
         private InputGraph graph;
-        private String bciString;
+        private final String bciString;
 
         public MethodNodeChildren(InputMethod method, InputGraph graph, String bciString) {
             this.method = method;

src/utils/IdealGraphVisualizer/Bytecodes/src/main/java/com/sun/hotspot/igv/bytecodes/SelectBytecodesCookie.java

@@ -34,7 +34,7 @@ import org.openide.nodes.Node;
  */
 public class SelectBytecodesCookie implements Node.Cookie {
 
-    private Set<InputNode> nodes;
+    private final Set<InputNode> nodes;
 
     /** Creates a new instance of SelectBytecodesCookie */
     public SelectBytecodesCookie(Set<InputNode> nodes) {

src/utils/IdealGraphVisualizer/Bytecodes/src/main/resources/com/sun/hotspot/igv/bytecodes/layer.xml

@@ -13,6 +13,7 @@
         <folder name="Window">
             <file name="BytecodeViewAction.shadow">
                 <attr name="originalFile" stringvalue="Actions/Window/com-sun-hotspot-igv-bytecodes-BytecodeViewAction.instance"/>
+                <attr name="position" intvalue="1"/>
             </file>
         </folder>
     </folder>

src/utils/IdealGraphVisualizer/ControlFlow/src/main/java/com/sun/hotspot/igv/controlflow/BlockConnectionWidget.java

@@ -24,9 +24,9 @@
 package com.sun.hotspot.igv.controlflow;
 
 import com.sun.hotspot.igv.data.InputBlockEdge;
+import com.sun.hotspot.igv.layout.Cluster;
 import com.sun.hotspot.igv.layout.Link;
 import com.sun.hotspot.igv.layout.Port;
-import com.sun.hotspot.igv.layout.Cluster;
 import java.awt.BasicStroke;
 import java.awt.Point;
 import java.awt.Stroke;
@@ -45,28 +45,22 @@ public class BlockConnectionWidget extends ConnectionWidget implements Link {
     private static final Stroke DASHED_STROKE = new BasicStroke(1.0f, BasicStroke.CAP_SQUARE, BasicStroke.JOIN_MITER, 10.0f, new float[]{5, 5}, 0);
     private static final Stroke BOLD_DASHED_STROKE = new BasicStroke(2.5f, BasicStroke.CAP_SQUARE, BasicStroke.JOIN_MITER, 10.0f, new float[]{5, 5}, 0);
 
-    private BlockWidget from;
+    private final BlockWidget from;
-    private BlockWidget to;
+    private final BlockWidget to;
-    private Port inputSlot;
+    private final Port inputSlot;
-    private Port outputSlot;
+    private final Port outputSlot;
     private List<Point> points;
-    private InputBlockEdge edge;
     private boolean isDashed = false;
     private boolean isBold = false;
 
     public BlockConnectionWidget(ControlFlowScene scene, InputBlockEdge edge) {
         super(scene);
 
-        this.edge = edge;
         this.from = (BlockWidget) scene.findWidget(edge.getFrom());
         this.to = (BlockWidget) scene.findWidget(edge.getTo());
         inputSlot = to.getInputSlot();
         outputSlot = from.getOutputSlot();
-        points = new ArrayList<Point>();
+        points = new ArrayList<>();
-    }
-
-    public InputBlockEdge getEdge() {
-        return edge;
     }
 
     public Port getTo() {

src/utils/IdealGraphVisualizer/ControlFlow/src/main/java/com/sun/hotspot/igv/controlflow/BlockWidget.java

@@ -27,11 +27,7 @@ import com.sun.hotspot.igv.data.InputBlock;
 import com.sun.hotspot.igv.layout.Cluster;
 import com.sun.hotspot.igv.layout.Port;
 import com.sun.hotspot.igv.layout.Vertex;
-import java.awt.Color;
+import java.awt.*;
-import java.awt.Dimension;
-import java.awt.Font;
-import java.awt.Point;
-import java.awt.Rectangle;
 import org.netbeans.api.visual.border.BorderFactory;
 import org.netbeans.api.visual.model.ObjectState;
 import org.netbeans.api.visual.widget.LabelWidget;
@@ -43,11 +39,10 @@ import org.netbeans.api.visual.widget.LabelWidget;
 public class BlockWidget extends LabelWidget implements Vertex {
 
     public static final Dimension MIN_SIZE = new Dimension(20, 20);
-    private InputBlock block;
+    private final InputBlock block;
-    private Port inputSlot;
+    private final Port inputSlot;
-    private Port outputSlot;
+    private final Port outputSlot;
     private Cluster cluster;
-    private boolean root;
     private static final Font font = new Font(Font.SANS_SERIF, Font.PLAIN, 12);
     private static final Font boldFont = font.deriveFont(Font.BOLD);
     public static final Color NORMAL_FOREGROUND_COLOR = Color.BLACK;
@@ -123,15 +118,7 @@ public class BlockWidget extends LabelWidget implements Vertex {
     }
 
     public boolean isRoot() {
-        return root;
+        return false;
-    }
-
-    public void setCluster(Cluster c) {
-        cluster = c;
-    }
-
-    public void setRoot(boolean b) {
-        root = b;
     }
 
     public int compareTo(Vertex o) {

src/utils/IdealGraphVisualizer/ControlFlow/src/main/java/com/sun/hotspot/igv/controlflow/ControlFlowScene.java

@@ -23,11 +23,11 @@
  */
 package com.sun.hotspot.igv.controlflow;
 
-import com.sun.hotspot.igv.data.InputBlockEdge;
 import com.sun.hotspot.igv.data.InputBlock;
+import com.sun.hotspot.igv.data.InputBlockEdge;
 import com.sun.hotspot.igv.data.InputGraph;
-import com.sun.hotspot.igv.data.services.InputGraphProvider;
 import com.sun.hotspot.igv.data.InputNode;
+import com.sun.hotspot.igv.data.services.InputGraphProvider;
 import com.sun.hotspot.igv.util.LookupHistory;
 import java.awt.Color;
 import java.awt.Point;
@@ -36,22 +36,17 @@ import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.Set;
 import javax.swing.BorderFactory;
-import org.netbeans.api.visual.action.ActionFactory;
+import org.netbeans.api.visual.action.*;
-import org.netbeans.api.visual.action.MoveProvider;
-import org.netbeans.api.visual.action.RectangularSelectDecorator;
-import org.netbeans.api.visual.action.RectangularSelectProvider;
-import org.netbeans.api.visual.action.SelectProvider;
-import org.netbeans.api.visual.action.WidgetAction;
 import org.netbeans.api.visual.anchor.AnchorFactory;
 import org.netbeans.api.visual.anchor.AnchorShape;
-import org.netbeans.api.visual.router.RouterFactory;
-import org.netbeans.api.visual.widget.LayerWidget;
-import org.netbeans.api.visual.widget.Widget;
 import org.netbeans.api.visual.graph.GraphScene;
 import org.netbeans.api.visual.graph.layout.GraphLayout;
 import org.netbeans.api.visual.layout.LayoutFactory;
 import org.netbeans.api.visual.layout.SceneLayout;
+import org.netbeans.api.visual.router.RouterFactory;
 import org.netbeans.api.visual.widget.ConnectionWidget;
+import org.netbeans.api.visual.widget.LayerWidget;
+import org.netbeans.api.visual.widget.Widget;
 
 /**
  *
@@ -59,34 +54,33 @@ import org.netbeans.api.visual.widget.ConnectionWidget;
  */
 public class ControlFlowScene extends GraphScene<InputBlock, InputBlockEdge> implements SelectProvider, MoveProvider, RectangularSelectDecorator, RectangularSelectProvider {
 
-    private HashSet<BlockWidget> selection;
+    private final HashSet<BlockWidget> selection;
     private InputGraph oldGraph;
-    private LayerWidget edgeLayer;
+    private final LayerWidget edgeLayer;
-    private LayerWidget mainLayer;
+    private final LayerWidget mainLayer;
-    private LayerWidget selectLayer;
+    private final WidgetAction hoverAction = createWidgetHoverAction();
-    private WidgetAction hoverAction = this.createWidgetHoverAction();
+    private final WidgetAction selectAction = new DoubleClickSelectAction(this);
-    private WidgetAction selectAction = new DoubleClickSelectAction(this);
+    private final WidgetAction moveAction = ActionFactory.createMoveAction(null, this);
-    private WidgetAction moveAction = ActionFactory.createMoveAction(null, this);
 
     public ControlFlowScene() {
-        selection = new HashSet<BlockWidget>();
+        selection = new HashSet<>();
 
-        this.getInputBindings().setZoomActionModifiers(0);
+        getInputBindings().setZoomActionModifiers(0);
-        this.setLayout(LayoutFactory.createAbsoluteLayout());
+        setLayout(LayoutFactory.createAbsoluteLayout());
 
         mainLayer = new LayerWidget(this);
-        this.addChild(mainLayer);
+        addChild(mainLayer);
 
         edgeLayer = new LayerWidget(this);
-        this.addChild(edgeLayer);
+        addChild(edgeLayer);
 
-        selectLayer = new LayerWidget(this);
+        LayerWidget selectLayer = new LayerWidget(this);
-        this.addChild(selectLayer);
+        addChild(selectLayer);
 
-        this.getActions().addAction(hoverAction);
+        getActions().addAction(hoverAction);
-        this.getActions().addAction(selectAction);
+        getActions().addAction(selectAction);
-        this.getActions().addAction(ActionFactory.createRectangularSelectAction(this, selectLayer, this));
+        getActions().addAction(ActionFactory.createRectangularSelectAction(this, selectLayer, this));
-        this.getActions().addAction(ActionFactory.createMouseCenteredZoomAction(1.1));
+        getActions().addAction(ActionFactory.createMouseCenteredZoomAction(1.1));
     }
 
     public void setGraph(InputGraph g) {
@@ -95,12 +89,12 @@ public class ControlFlowScene extends GraphScene<InputBlock, InputBlockEdge> imp
         }
         oldGraph = g;
 
-        ArrayList<InputBlock> blocks = new ArrayList<InputBlock>(this.getNodes());
+        ArrayList<InputBlock> blocks = new ArrayList<>(getNodes());
         for (InputBlock b : blocks) {
             removeNode(b);
         }
 
-        ArrayList<InputBlockEdge> edges = new ArrayList<InputBlockEdge>(this.getEdges());
+        ArrayList<InputBlockEdge> edges = new ArrayList<>(getEdges());
         for (InputBlockEdge e : edges) {
             removeEdge(e);
         }
@@ -113,15 +107,15 @@ public class ControlFlowScene extends GraphScene<InputBlock, InputBlockEdge> imp
             addEdge(e);
             assert g.getBlocks().contains(e.getFrom());
             assert g.getBlocks().contains(e.getTo());
-            this.setEdgeSource(e, e.getFrom());
+            setEdgeSource(e, e.getFrom());
-            this.setEdgeTarget(e, e.getTo());
+            setEdgeTarget(e, e.getTo());
         }
 
-        GraphLayout<InputBlock, InputBlockEdge> layout = new HierarchicalGraphLayout<InputBlock, InputBlockEdge>();//GridGraphLayout();
+        GraphLayout<InputBlock, InputBlockEdge> layout = new HierarchicalGraphLayout<>();
         SceneLayout sceneLayout = LayoutFactory.createSceneGraphLayout(this, layout);
         sceneLayout.invokeLayout();
 
-        this.validate();
+        validate();
     }
 
     public void clearSelection() {
@@ -135,7 +129,7 @@ public class ControlFlowScene extends GraphScene<InputBlock, InputBlockEdge> imp
     public void selectionChanged() {
         InputGraphProvider p = LookupHistory.getLast(InputGraphProvider.class);
         if (p != null) {
-            Set<InputNode> inputNodes = new HashSet<InputNode>();
+            Set<InputNode> inputNodes = new HashSet<>();
             for (BlockWidget w : selection) {
                 inputNodes.addAll(w.getBlock().getNodes());
             }
@@ -155,14 +149,17 @@ public class ControlFlowScene extends GraphScene<InputBlock, InputBlockEdge> imp
         selectionChanged();
     }
 
+    @Override
     public boolean isAimingAllowed(Widget widget, Point point, boolean b) {
         return false;
     }
 
+    @Override
     public boolean isSelectionAllowed(Widget widget, Point point, boolean b) {
         return true;
     }
 
+    @Override
     public void select(Widget widget, Point point, boolean change) {
         if (widget == this) {
             clearSelection();
@@ -185,18 +182,22 @@ public class ControlFlowScene extends GraphScene<InputBlock, InputBlockEdge> imp
         }
     }
 
-    public void movementStarted(Widget widget) {
+    @Override
-    }
+    public void movementStarted(Widget widget) {}
 
-    public void movementFinished(Widget widget) {
+    @Override
-    }
 
+    public void movementFinished(Widget widget) {}
+
+    @Override
     public Point getOriginalLocation(Widget widget) {
         return widget.getPreferredLocation();
     }
 
+    @Override
     public void setNewLocation(Widget widget, Point location) {
-        if (selection.contains(widget)) {
+        assert widget instanceof BlockWidget;
+        if (selection.contains((BlockWidget) widget)) {
             // move entire selection
             Point originalLocation = getOriginalLocation(widget);
             int xOffset = location.x - originalLocation.x;
@@ -211,6 +212,7 @@ public class ControlFlowScene extends GraphScene<InputBlock, InputBlockEdge> imp
         }
     }
 
+    @Override
     public Widget createSelectionWidget() {
         Widget widget = new Widget(this);
         widget.setOpaque(false);
@@ -219,6 +221,7 @@ public class ControlFlowScene extends GraphScene<InputBlock, InputBlockEdge> imp
         return widget;
     }
 
+    @Override
     public void performSelection(Rectangle rectangle) {
 
         if (rectangle.width < 0) {
@@ -232,7 +235,7 @@ public class ControlFlowScene extends GraphScene<InputBlock, InputBlockEdge> imp
         }
 
         boolean changed = false;
-        for (InputBlock b : this.getNodes()) {
+        for (InputBlock b : getNodes()) {
             BlockWidget w = (BlockWidget) findWidget(b);
             Rectangle r = new Rectangle(w.getBounds());
             r.setLocation(w.getLocation());
@@ -257,6 +260,7 @@ public class ControlFlowScene extends GraphScene<InputBlock, InputBlockEdge> imp
 
     }
 
+    @Override
     protected Widget attachNodeWidget(InputBlock node) {
         BlockWidget w = new BlockWidget(this, node);
         mainLayer.addChild(w);
@@ -266,6 +270,7 @@ public class ControlFlowScene extends GraphScene<InputBlock, InputBlockEdge> imp
         return w;
     }
 
+    @Override
     protected Widget attachEdgeWidget(InputBlockEdge edge) {
         BlockConnectionWidget w = new BlockConnectionWidget(this, edge);
         switch (edge.getState()) {
@@ -282,16 +287,18 @@ public class ControlFlowScene extends GraphScene<InputBlock, InputBlockEdge> imp
         return w;
     }
 
+    @Override
     protected void attachEdgeSourceAnchor(InputBlockEdge edge, InputBlock oldSourceNode, InputBlock sourceNode) {
-        Widget w = this.findWidget(edge);
+        Widget w = findWidget(edge);
         assert w instanceof ConnectionWidget;
         ConnectionWidget cw = (ConnectionWidget) w;
         cw.setSourceAnchor(AnchorFactory.createRectangularAnchor(findWidget(sourceNode)));
 
     }
 
+    @Override
     protected void attachEdgeTargetAnchor(InputBlockEdge edge, InputBlock oldTargetNode, InputBlock targetNode) {
-        Widget w = this.findWidget(edge);
+        Widget w = findWidget(edge);
         assert w instanceof ConnectionWidget;
         ConnectionWidget cw = (ConnectionWidget) w;
         cw.setTargetAnchor(AnchorFactory.createRectangularAnchor(findWidget(targetNode)));

src/utils/IdealGraphVisualizer/ControlFlow/src/main/java/com/sun/hotspot/igv/controlflow/ControlFlowTopComponent.java

@@ -28,7 +28,6 @@ import com.sun.hotspot.igv.data.InputGraph;
 import com.sun.hotspot.igv.data.services.InputGraphProvider;
 import com.sun.hotspot.igv.util.LookupHistory;
 import java.awt.BorderLayout;
-import java.io.Serializable;
 import javax.swing.JScrollPane;
 import org.openide.ErrorManager;
 import org.openide.util.NbBundle;
@@ -51,12 +50,11 @@ final class ControlFlowTopComponent extends TopComponent implements ChangedListe
         setToolTipText(NbBundle.getMessage(ControlFlowTopComponent.class, "HINT_ControlFlowTopComponent"));
 
         scene = new ControlFlowScene();
-        this.setLayout(new BorderLayout());
+        setLayout(new BorderLayout());
-        this.associateLookup(scene.getLookup());
+        associateLookup(scene.getLookup());
-
 
         JScrollPane panel = new JScrollPane(scene.createView());
-        this.add(panel, BorderLayout.CENTER);
+        add(panel, BorderLayout.CENTER);
     }
 
     /**
@@ -114,11 +112,6 @@ final class ControlFlowTopComponent extends TopComponent implements ChangedListe
         scene.setGraph(new InputGraph(""));
     }
 
-    @Override
-    public Object writeReplace() {
-        return new ResolvableHelper();
-    }
-
     @Override
     protected String preferredID() {
         return PREFERRED_ID;
@@ -130,15 +123,6 @@ final class ControlFlowTopComponent extends TopComponent implements ChangedListe
         scene.getView().requestFocus();
     }
 
-    static final class ResolvableHelper implements Serializable {
-
-        private static final long serialVersionUID = 1L;
-
-        public Object readResolve() {
-            return ControlFlowTopComponent.getDefault();
-        }
-    }
-
     /** This method is called from within the constructor to
      * initialize the form.
      * WARNING: Do NOT modify this code. The content of this method is

src/utils/IdealGraphVisualizer/ControlFlow/src/main/java/com/sun/hotspot/igv/controlflow/HierarchicalGraphLayout.java

@@ -24,20 +24,10 @@
 package com.sun.hotspot.igv.controlflow;
 
 import com.sun.hotspot.igv.hierarchicallayout.HierarchicalLayoutManager;
-import com.sun.hotspot.igv.layout.Cluster;
+import com.sun.hotspot.igv.layout.*;
-import com.sun.hotspot.igv.layout.LayoutGraph;
-import com.sun.hotspot.igv.layout.Link;
-import com.sun.hotspot.igv.layout.Port;
-import com.sun.hotspot.igv.layout.Vertex;
 import java.awt.Dimension;
 import java.awt.Point;
-import java.util.ArrayList;
+import java.util.*;
-import java.util.Collection;
-import java.util.HashMap;
-import java.util.LinkedHashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
 import org.netbeans.api.visual.graph.layout.GraphLayout;
 import org.netbeans.api.visual.graph.layout.UniversalGraph;
 import org.netbeans.api.visual.widget.Widget;
@@ -48,13 +38,12 @@ import org.netbeans.api.visual.widget.Widget;
  */
 public class HierarchicalGraphLayout<N, E> extends GraphLayout<N, E> {
 
-    public HierarchicalGraphLayout() {
+    public HierarchicalGraphLayout() {}
-    }
 
     private class LinkWrapper implements Link {
 
-        private VertexWrapper from;
+        private final VertexWrapper from;
-        private VertexWrapper to;
+        private final VertexWrapper to;
 
         public LinkWrapper(VertexWrapper from, VertexWrapper to) {
             this.from = from;
@@ -78,7 +67,7 @@ public class HierarchicalGraphLayout<N, E> extends GraphLayout<N, E> {
         }
 
         public List<Point> getControlPoints() {
-            return new ArrayList<Point>();
+            return new ArrayList<>();
         }
 
         public void setControlPoints(List<Point> list) {
@@ -92,9 +81,9 @@ public class HierarchicalGraphLayout<N, E> extends GraphLayout<N, E> {
 
     private class VertexWrapper implements Vertex {
 
-        private N node;
+        private final N node;
-        private UniversalGraph<N, E> graph;
+        private final UniversalGraph<N, E> graph;
-        private Port slot;
+        private final Port slot;
         private Point position;
 
         public VertexWrapper(N node, UniversalGraph<N, E> graph) {
@@ -122,6 +111,7 @@ public class HierarchicalGraphLayout<N, E> extends GraphLayout<N, E> {
 
         public Dimension getSize() {
             Widget w = graph.getScene().findWidget(node);
+            assert w.getBounds() != null;
             return w.getBounds().getSize();
         }
 
@@ -151,9 +141,9 @@ public class HierarchicalGraphLayout<N, E> extends GraphLayout<N, E> {
 
     protected void performGraphLayout(UniversalGraph<N, E> graph) {
 
-        Set<LinkWrapper> links = new LinkedHashSet<LinkWrapper>();
+        Set<LinkWrapper> links = new LinkedHashSet<>();
-        Set<VertexWrapper> vertices = new LinkedHashSet<VertexWrapper>();
+        Set<VertexWrapper> vertices = new LinkedHashSet<>();
-        Map<N, VertexWrapper> vertexMap = new HashMap<N, VertexWrapper>();
+        Map<N, VertexWrapper> vertexMap = new HashMap<>();
 
         for (N node : graph.getNodes()) {
             VertexWrapper v = new VertexWrapper(node, graph);

src/utils/IdealGraphVisualizer/ControlFlow/src/main/resources/com/sun/hotspot/igv/controlflow/layer.xml

@@ -10,6 +10,7 @@
         <folder name="Window">
             <file name="ControlFlowAction.shadow">
                 <attr name="originalFile" stringvalue="Actions/Window/com-sun-hotspot-igv-controlflow-ControlFlowAction.instance"/>
+                <attr name="position" intvalue="2"/>
             </file>
         </folder>
     </folder>

src/utils/IdealGraphVisualizer/Coordinator/src/main/java/com/sun/hotspot/igv/coordinator/FolderNode.java

@@ -28,8 +28,8 @@ import com.sun.hotspot.igv.data.*;
 import com.sun.hotspot.igv.util.PropertiesSheet;
 import com.sun.hotspot.igv.util.StringUtils;
 import java.awt.Image;
-import java.util.List;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import org.openide.nodes.AbstractNode;
 import org.openide.nodes.Children;
@@ -45,11 +45,11 @@ import org.openide.util.lookup.InstanceContent;
  */
 public class FolderNode extends AbstractNode {
 
-    private InstanceContent content;
+    private final InstanceContent content;
-    private FolderChildren children;
+    private final FolderChildren children;
     // NetBeans node corresponding to each opened graph. Used to highlight the
     // focused graph in the Outline window.
-    private static Map<InputGraph, GraphNode> graphNode = new HashMap<>();
+    private static final Map<InputGraph, GraphNode> graphNode = new HashMap<>();
     private boolean selected = false;
 
     private static class FolderChildren extends Children.Keys<FolderElement> implements ChangedListener {
@@ -128,12 +128,9 @@ public class FolderNode extends AbstractNode {
         if (folder instanceof FolderElement) {
             final FolderElement folderElement = (FolderElement) folder;
             this.setDisplayName(folderElement.getName());
-            content.add(new RemoveCookie() {
+            content.add((RemoveCookie) () -> {
-                @Override
-                public void remove() {
                 children.destroyNodes(children.getNodes());
                 folderElement.getParent().removeElement(folderElement);
-                }
             });
         }
     }
@@ -163,7 +160,7 @@ public class FolderNode extends AbstractNode {
 
     public boolean isRootNode() {
         Folder folder = getFolder();
-        return (folder != null && folder instanceof GraphDocument);
+        return (folder instanceof GraphDocument);
     }
 
     @Override

src/utils/IdealGraphVisualizer/Coordinator/src/main/java/com/sun/hotspot/igv/coordinator/GraphNode.java

@@ -23,12 +23,7 @@
  */
 package com.sun.hotspot.igv.coordinator;
 
-import com.sun.hotspot.igv.coordinator.actions.CloneGraphAction;
+import com.sun.hotspot.igv.coordinator.actions.*;
-import com.sun.hotspot.igv.coordinator.actions.DiffGraphAction;
-import com.sun.hotspot.igv.coordinator.actions.DiffGraphCookie;
-import com.sun.hotspot.igv.coordinator.actions.GraphCloneCookie;
-import com.sun.hotspot.igv.coordinator.actions.GraphOpenCookie;
-import com.sun.hotspot.igv.coordinator.actions.GraphRemoveCookie;
 import com.sun.hotspot.igv.data.InputGraph;
 import com.sun.hotspot.igv.data.Properties;
 import com.sun.hotspot.igv.data.services.GraphViewer;
@@ -37,12 +32,7 @@ import com.sun.hotspot.igv.util.StringUtils;
 import java.awt.Image;
 import javax.swing.Action;
 import org.openide.actions.OpenAction;
-import org.openide.nodes.AbstractNode;
+import org.openide.nodes.*;
-import org.openide.nodes.Children;
-import org.openide.nodes.NodeAdapter;
-import org.openide.nodes.NodeEvent;
-import org.openide.nodes.NodeMemberEvent;
-import org.openide.nodes.Sheet;
 import org.openide.util.ImageUtilities;
 import org.openide.util.Lookup;
 import org.openide.util.lookup.AbstractLookup;
@@ -132,12 +122,12 @@ public class GraphNode extends AbstractNode {
 
     @Override
     public Action[] getActions(boolean b) {
-        return new Action[]{(Action) DiffGraphAction.findObject(DiffGraphAction.class, true), (Action) CloneGraphAction.findObject(CloneGraphAction.class, true), (Action) OpenAction.findObject(OpenAction.class, true)};
+        return new Action[]{DiffGraphAction.findObject(DiffGraphAction.class, true), CloneGraphAction.findObject(CloneGraphAction.class, true), OpenAction.findObject(OpenAction.class, true)};
     }
 
     @Override
     public Action getPreferredAction() {
-        return (Action) OpenAction.findObject(OpenAction.class, true);
+        return OpenAction.findObject(OpenAction.class, true);
     }
 
     @Override

src/utils/IdealGraphVisualizer/Coordinator/src/main/java/com/sun/hotspot/igv/coordinator/OutlineTopComponent.java

@@ -37,7 +37,6 @@ import java.awt.Dimension;
 import java.io.IOException;
 import java.io.ObjectInput;
 import java.io.ObjectOutput;
-import java.io.Serializable;
 import java.util.HashSet;
 import java.util.Set;
 import javax.swing.UIManager;
@@ -66,8 +65,6 @@ public final class OutlineTopComponent extends TopComponent implements ExplorerM
     private ExplorerManager manager;
     private final GraphDocument document;
     private FolderNode root;
-    private Server server;
-    private Server binaryServer;
     private SaveAllAction saveAllAction;
     private RemoveAllAction removeAllAction;
     private GraphNode[] selectedGraphs = new GraphNode[0];
@@ -138,8 +135,7 @@ public final class OutlineTopComponent extends TopComponent implements ExplorerM
             }
         };
 
-        server = new Server(getDocument(), callback, false);
+        new Server(callback);
-        binaryServer = new Server(getDocument(), callback, true);
     }
 
     public void clear() {
@@ -286,15 +282,6 @@ public final class OutlineTopComponent extends TopComponent implements ExplorerM
         super.writeExternal(objectOutput);
     }
 
-    static final class ResolvableHelper implements Serializable {
-
-        private static final long serialVersionUID = 1L;
-
-        public Object readResolve() {
-            return OutlineTopComponent.getDefault();
-        }
-    }
-
     /** This method is called from within the constructor to
      * initialize the form.
      * WARNING: Do NOT modify this code. The content of this method is

src/utils/IdealGraphVisualizer/Coordinator/src/main/java/com/sun/hotspot/igv/coordinator/actions/ImportAction.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -26,31 +26,24 @@ package com.sun.hotspot.igv.coordinator.actions;
 
 import com.sun.hotspot.igv.coordinator.OutlineTopComponent;
 import com.sun.hotspot.igv.data.GraphDocument;
-import com.sun.hotspot.igv.data.serialization.BinaryParser;
 import com.sun.hotspot.igv.data.serialization.GraphParser;
 import com.sun.hotspot.igv.data.serialization.ParseMonitor;
 import com.sun.hotspot.igv.data.serialization.Parser;
 import com.sun.hotspot.igv.settings.Settings;
-import java.awt.event.ActionEvent;
 import java.io.File;
-import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.nio.channels.FileChannel;
 import java.nio.file.StandardOpenOption;
 import java.util.logging.Level;
 import java.util.logging.Logger;
+import javax.swing.Action;
 import javax.swing.JFileChooser;
 import javax.swing.SwingUtilities;
 import javax.swing.filechooser.FileFilter;
-import javax.swing.Action;
 import org.netbeans.api.progress.ProgressHandle;
 import org.netbeans.api.progress.ProgressHandleFactory;
-import org.openide.util.Exceptions;
+import org.openide.util.*;
-import org.openide.util.RequestProcessor;
-import org.openide.util.HelpCtx;
-import org.openide.util.NbBundle;
 import org.openide.util.actions.CallableSystemAction;
-import org.openide.util.Utilities;
 
 /**
  *
@@ -65,12 +58,12 @@ public final class ImportAction extends CallableSystemAction {
 
             @Override
             public boolean accept(File f) {
-                return f.getName().toLowerCase().endsWith(".xml") || f.getName().toLowerCase().endsWith(".bgv") || f.isDirectory();
+                return f.getName().toLowerCase().endsWith(".xml") || f.isDirectory();
             }
 
             @Override
             public String getDescription() {
-                return "Graph files (*.xml, *.bgv)";
+                return "Graph files (*.xml)";
             }
         };
     }
@@ -102,8 +95,7 @@ public final class ImportAction extends CallableSystemAction {
                                 try {
                                     int prog = (int) (WORKUNITS * (double) channel.position() / (double) start);
                                     handle.progress(prog);
-                                } catch (IOException ex) {
+                                } catch (IOException ignored) {}
-                                }
                             }
                             @Override
                             public void setState(String state) {
@@ -115,8 +107,6 @@ public final class ImportAction extends CallableSystemAction {
                     final OutlineTopComponent component = OutlineTopComponent.findInstance();
                     if (file.getName().endsWith(".xml")) {
                         parser = new Parser(channel, monitor, null);
-                    } else if (file.getName().endsWith(".bgv")) {
-                        parser = new BinaryParser(channel, monitor, component.getDocument(), null);
                     } else {
                         parser = null;
                     }
@@ -126,12 +116,9 @@ public final class ImportAction extends CallableSystemAction {
                                 try {
                                     final GraphDocument document = parser.parse();
                                     if (document != null) {
-                                        SwingUtilities.invokeLater(new Runnable(){
+                                        SwingUtilities.invokeLater(() -> {
-                                                @Override
-                                                public void run() {
                                             component.requestActive();
                                             component.getDocument().addGraphDocument(document);
-                                                }
                                         });
                                     }
                                 } catch (IOException ex) {
@@ -142,8 +129,6 @@ public final class ImportAction extends CallableSystemAction {
                                 Logger.getLogger(getClass().getName()).log(Level.INFO, "Loaded in " + file + " in " + ((stop - startTime) / 1000.0) + " seconds");
                             }
                         });
-                } catch (FileNotFoundException ex) {
-                    Exceptions.printStackTrace(ex);
                 } catch (IOException ex) {
                     Exceptions.printStackTrace(ex);
                 }

src/utils/IdealGraphVisualizer/Coordinator/src/main/java/com/sun/hotspot/igv/coordinator/actions/RemoveAllAction.java

@@ -25,10 +25,7 @@
 package com.sun.hotspot.igv.coordinator.actions;
 
 import com.sun.hotspot.igv.coordinator.OutlineTopComponent;
-import java.awt.event.InputEvent;
-import java.awt.event.KeyEvent;
 import javax.swing.Action;
-import javax.swing.KeyStroke;
 import org.openide.util.HelpCtx;
 import org.openide.util.NbBundle;
 import org.openide.util.actions.CallableSystemAction;

src/utils/IdealGraphVisualizer/Coordinator/src/main/java/com/sun/hotspot/igv/coordinator/actions/SaveAllAction.java

@@ -25,15 +25,11 @@
 package com.sun.hotspot.igv.coordinator.actions;
 
 import com.sun.hotspot.igv.coordinator.OutlineTopComponent;
-import java.awt.event.InputEvent;
-import java.awt.event.KeyEvent;
 import javax.swing.Action;
-import javax.swing.KeyStroke;
 import org.openide.util.HelpCtx;
 import org.openide.util.NbBundle;
-import org.openide.util.NbBundle.Messages;
-import org.openide.util.actions.CallableSystemAction;
 import org.openide.util.Utilities;
+import org.openide.util.actions.CallableSystemAction;
 
 /**
  *

src/utils/IdealGraphVisualizer/Coordinator/src/main/java/com/sun/hotspot/igv/coordinator/actions/SaveAsAction.java

@@ -25,19 +25,21 @@
 package com.sun.hotspot.igv.coordinator.actions;
 
 import com.sun.hotspot.igv.coordinator.FolderNode;
-import com.sun.hotspot.igv.coordinator.OutlineTopComponent;
 import com.sun.hotspot.igv.data.Folder;
 import com.sun.hotspot.igv.data.GraphDocument;
 import com.sun.hotspot.igv.data.Group;
 import com.sun.hotspot.igv.data.serialization.Printer;
 import com.sun.hotspot.igv.settings.Settings;
-import java.io.*;
+import java.io.File;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+import java.io.Writer;
+import java.nio.file.Files;
 import javax.swing.Action;
 import javax.swing.JFileChooser;
 import org.openide.nodes.Node;
 import org.openide.util.HelpCtx;
 import org.openide.util.NbBundle;
-import org.openide.util.actions.CookieAction;
 import org.openide.util.actions.NodeAction;
 
 /**
@@ -52,7 +54,6 @@ public final class SaveAsAction extends NodeAction {
 
     @Override
     protected void performAction(Node[] activatedNodes) {
-        final OutlineTopComponent component = OutlineTopComponent.findInstance();
         GraphDocument doc = new GraphDocument();
         for (Node node : activatedNodes) {
             if (node instanceof FolderNode) {
@@ -84,23 +85,16 @@ public final class SaveAsAction extends NodeAction {
             }
             Settings.get().put(Settings.DIRECTORY, dir.getAbsolutePath());
             try {
-                try (Writer writer = new OutputStreamWriter(new FileOutputStream(file))) {
+                try (Writer writer = new OutputStreamWriter(Files.newOutputStream(file.toPath()))) {
                     Printer p = new Printer();
                     p.export(writer, doc);
                 }
-            } catch (FileNotFoundException e) {
-                e.printStackTrace();
             } catch (IOException e) {
                 e.printStackTrace();
-
             }
         }
     }
 
-    protected int mode() {
-        return CookieAction.MODE_SOME;
-    }
-
     @Override
     public String getName() {
         return NbBundle.getMessage(SaveAsAction.class, "CTL_SaveAsAction");

src/utils/IdealGraphVisualizer/Coordinator/src/main/resources/com/sun/hotspot/igv/coordinator/layer.xml

@@ -46,6 +46,7 @@
 
     <folder name="Menu">
         <folder name="File">
+            <attr name="position" intvalue="50"/>
             <file name="Export_hidden"/>
             <file name="Import_hidden"/>
             <file name="Separator2.instance_hidden"/>
@@ -98,6 +99,7 @@
         </folder>
 
         <folder name="Edit">
+            <attr name="position" intvalue="100"/>
             <file name="org-openide-actions-UndoAction.shadow">
                 <attr name="originalFile" stringvalue="Actions/Edit/org-openide-actions-UndoAction.instance"/>
                 <attr name="position" intvalue="100"/>
@@ -132,6 +134,7 @@
         </folder>
 
         <folder name="View">
+            <attr name="position" intvalue="150"/>
             <!-- Hidden menu entries from other modules -->
             <file name="Separator1.instance_hidden"/>
             <file name="Separator2.instance_hidden"/>
@@ -159,14 +162,18 @@
         <folder name="Versioning_hidden"/>
 
         <folder name="Options">
+            <attr name="position" intvalue="200"/>
             <file name="org-netbeans-modules-options-OptionsWindowAction.shadow">
                 <attr name="originalFile" stringvalue="Actions/Window/org-netbeans-modules-options-OptionsWindowAction.instance"/>
+                <attr name="position" intvalue="1"/>
             </file>
         </folder>
 
         <folder name="Window">
+            <attr name="position" intvalue="250"/>
             <file name="OutlineAction.shadow">
                 <attr name="originalFile" stringvalue="Actions/Window/com-sun-hotspot-igv-coordinator-actions-OutlineAction.instance"/>
+                <attr name="position" intvalue="4"/>
             </file>
             <!-- Hidden menu entries from other modules -->
             <file name="Web_hidden"/>
@@ -188,6 +195,7 @@
         </folder>
 
         <folder name="Help">
+            <attr name="position" intvalue="300"/>
             <!-- Hidden menu entries from other modules -->
             <file name="Separator1.instance_hidden"/>
             <file name="netbeans-kb.url_hidden"/>

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/ChangedEvent.java

@@ -30,7 +30,7 @@ package com.sun.hotspot.igv.data;
  */
 public class ChangedEvent<T> extends Event<ChangedListener<T>> {
 
-    private T object;
+    private final T object;
 
     /**
      * Creates a new event with the specific object as the one for which the event gets fired.

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/Event.java

@@ -32,7 +32,7 @@ import java.util.List;
  */
 public abstract class Event<L> {
 
-    private List<L> listener;
+    private final List<L> listener;
     private boolean fireEvents;
     private boolean eventWasFired;
 
@@ -45,10 +45,6 @@ public abstract class Event<L> {
         listener.add(l);
     }
 
-    /**
-     * Remove listener
-     * @param l
-     */
     public void removeListener(final L l) {
         listener.remove(l);
     }

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/GraphDocument.java

@@ -32,8 +32,8 @@ import java.util.List;
  */
 public class GraphDocument extends Properties.Entity implements ChangedEventProvider<GraphDocument>, Folder {
 
-    private List<FolderElement> elements;
+    private final List<FolderElement> elements;
-    private ChangedEvent<GraphDocument> changedEvent;
+    private final ChangedEvent<GraphDocument> changedEvent;
 
     public GraphDocument() {
         elements = new ArrayList<>();

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/Group.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -31,26 +31,18 @@ import java.util.*;
  */
 public class Group extends Properties.Entity implements ChangedEventProvider<Group>, Folder, FolderElement {
 
-    private final List<FolderElement> elements;
     private final List<InputGraph> graphs;
-
     private InputMethod method;
-    private transient ChangedEvent<Group> changedEvent;
+    private final transient ChangedEvent<Group> changedEvent;
     private Folder parent;
 
     public Group(Folder parent) {
-        elements = new ArrayList<>();
         graphs = new ArrayList<>();
         changedEvent = new ChangedEvent<>(this);
         this.parent = parent;
 
-        // Ensure that name and type are never null
+        // Ensure that name is never null
         getProperties().setProperty("name", "");
-        getProperties().setProperty("type", "");
-    }
-
-    public void fireChangedEvent() {
-        changedEvent.fire();
     }
 
     public void setMethod(InputMethod method) {
@@ -67,34 +59,35 @@ public class Group extends Properties.Entity implements ChangedEventProvider<Gro
     }
 
     @Override
-    public List<FolderElement> getElements() {
+    public void addElement(FolderElement element) {
-        return Collections.unmodifiableList(elements);
+        assert element instanceof InputGraph;
-    }
+        graphs.add((InputGraph) element);
-
+        element.setParent(this);
-    public int getGraphsCount() {
+        getChangedEvent().fire();
-        return elements.size();
     }
 
     @Override
-    public void addElement(FolderElement element) {
+    public void removeElement(FolderElement element) {
-        elements.add(element);
+        assert element instanceof InputGraph;
-        if (element instanceof InputGraph) {
+        if (graphs.remove((InputGraph) element)) {
-            graphs.add((InputGraph) element);
+            getChangedEvent().fire();
-        } else {
-
         }
-        element.setParent(this);
+    }
-        changedEvent.fire();
+
+    @Override
+    public List<FolderElement> getElements() {
+        return Collections.unmodifiableList(graphs);
+    }
+
+    public List<InputGraph> getGraphs() {
+        return Collections.unmodifiableList(graphs);
     }
 
     public Set<Integer> getAllNodes() {
         Set<Integer> result = new HashSet<>();
-        for (FolderElement e : elements) {
+        for (InputGraph g : graphs) {
-            if (e instanceof InputGraph) {
-                InputGraph g = (InputGraph) e;
             result.addAll(g.getNodesAsSet());
         }
-        }
         return result;
     }
 
@@ -102,7 +95,7 @@ public class Group extends Properties.Entity implements ChangedEventProvider<Gro
     public String toString() {
         StringBuilder sb = new StringBuilder();
         sb.append("Group ").append(getProperties()).append("\n");
-        for (FolderElement g : elements) {
+        for (FolderElement g : getElements()) {
             sb.append(g.toString());
             sb.append('\n');
         }
@@ -121,7 +114,7 @@ public class Group extends Properties.Entity implements ChangedEventProvider<Gro
 
     InputGraph getPrev(InputGraph graph) {
         InputGraph lastGraph = null;
-        for (FolderElement e : elements) {
+        for (FolderElement e : getElements()) {
             if (e == graph) {
                 return lastGraph;
             }
@@ -134,7 +127,7 @@ public class Group extends Properties.Entity implements ChangedEventProvider<Gro
 
     InputGraph getNext(InputGraph graph) {
         boolean found = false;
-        for (FolderElement e : elements) {
+        for (FolderElement e : getElements()) {
             if (e == graph) {
                 found = true;
             } else if (found && e instanceof InputGraph) {
@@ -144,35 +137,10 @@ public class Group extends Properties.Entity implements ChangedEventProvider<Gro
         return null;
     }
 
-    public InputGraph getLastGraph() {
-        InputGraph lastGraph = null;
-        for (FolderElement e : elements) {
-            if (e instanceof InputGraph) {
-                lastGraph = (InputGraph) e;
-            }
-        }
-        return lastGraph;
-    }
-
     @Override
     public Folder getParent() {
          return parent;
     }
-
-    @Override
-    public void removeElement(FolderElement element) {
-        if (elements.remove(element)) {
-            if (element instanceof InputGraph) {
-                graphs.remove((InputGraph) element);
-            }
-            changedEvent.fire();
-        }
-    }
-
-    public List<InputGraph> getGraphs() {
-        return graphs;
-    }
-
     @Override
     public void setParent(Folder parent) {
         this.parent = parent;

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/InputBlock.java

@@ -32,9 +32,9 @@ import java.util.*;
 public class InputBlock {
 
     private List<InputNode> nodes;
-    private String name;
+    private final String name;
-    private InputGraph graph;
+    private final InputGraph graph;
-    private Set<InputBlock> successors;
+    private final Set<InputBlock> successors;
     private boolean artificial;
 
     @Override
@@ -49,7 +49,7 @@ public class InputBlock {
             return true;
         }
 
-        if (o == null || (!(o instanceof InputBlock))) {
+        if ((!(o instanceof InputBlock))) {
             return false;
         }
 
@@ -113,13 +113,11 @@ public class InputBlock {
     }
 
     void addSuccessor(InputBlock b) {
-        if (!successors.contains(b)) {
         successors.add(b);
     }
-    }
 
-    void setArtificial(boolean artificial) {
+    void setArtificial() {
-        this.artificial = artificial;
+        this.artificial = true;
     }
 
     public boolean isArtificial() {

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/InputBlockEdge.java

@@ -35,10 +35,10 @@ public class InputBlockEdge {
         DELETED
     }
 
-    private InputBlock from;
+    private final InputBlock from;
-    private InputBlock to;
+    private final InputBlock to;
     private State state = State.SAME;
-    private String label;
+    private final String label;
 
     public InputBlockEdge(InputBlock from, InputBlock to, String label) {
         assert from != null;
@@ -70,7 +70,7 @@ public class InputBlockEdge {
 
     @Override
     public boolean equals(Object obj) {
-        if (obj != null && obj instanceof InputBlockEdge) {
+        if (obj instanceof InputBlockEdge) {
             InputBlockEdge e = (InputBlockEdge) obj;
             return e.from.equals(from) && e.to.equals(to);
         }

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/InputBytecode.java

@@ -29,10 +29,10 @@ package com.sun.hotspot.igv.data;
  */
 public class InputBytecode {
 
-    private int bci;
+    private final int bci;
-    private String name;
+    private final String name;
-    private String operands;
+    private final String operands;
-    private String comment;
+    private final String comment;
     private InputMethod inlined;
 
     public InputBytecode(int bci, String name, String operands, String comment) {

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/InputEdge.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -24,8 +24,7 @@
 package com.sun.hotspot.igv.data;
 
 import java.util.Comparator;
-import java.util.WeakHashMap;
+import java.util.Objects;
-import java.lang.ref.WeakReference;
 
 /**
  *
@@ -40,26 +39,18 @@ public class InputEdge {
         DELETED
     }
 
-    public static final Comparator<InputEdge> OUTGOING_COMPARATOR = new Comparator<InputEdge>(){
+    public static final Comparator<InputEdge> OUTGOING_COMPARATOR = (o1, o2) -> {
-
-        @Override
-            public int compare(InputEdge o1, InputEdge o2) {
             if (o1.getFromIndex() == o2.getFromIndex()) {
                 return o1.getTo() - o2.getTo();
             }
             return o1.getFromIndex() - o2.getFromIndex();
-            }
         };
 
-    public static final Comparator<InputEdge> INGOING_COMPARATOR = new Comparator<InputEdge>(){
+    public static final Comparator<InputEdge> INGOING_COMPARATOR = (o1, o2) -> {
-
-        @Override
-            public int compare(InputEdge o1, InputEdge o2) {
             if (o1.getToIndex() == o2.getToIndex()) {
                 return o1.getFrom() - o2.getFrom();
             }
             return o1.getToIndex() - o2.getToIndex();
-            }
         };
 
     private final char toIndex;
@@ -70,14 +61,6 @@ public class InputEdge {
     private final String type;
     private State state;
 
-    public InputEdge(char toIndex, int from, int to) {
-        this((char) 0, toIndex, from, to, null, null);
-    }
-
-    public InputEdge(char fromIndex, char toIndex, int from, int to) {
-        this(fromIndex, toIndex, from, to, null, null);
-    }
-
     public InputEdge(char fromIndex, char toIndex, int from, int to, String label, String type) {
         this.toIndex = toIndex;
         this.fromIndex = fromIndex;
@@ -88,31 +71,6 @@ public class InputEdge {
         this.type = type.intern();
     }
 
-    static WeakHashMap<InputEdge, WeakReference<InputEdge>> immutableCache = new WeakHashMap<>();
-
-    public static synchronized InputEdge createImmutable(char fromIndex, char toIndex, int from, int to, String label, String type) {
-        InputEdge edge = new InputEdge(fromIndex, toIndex, from, to, label, type, State.IMMUTABLE);
-        WeakReference<InputEdge> result = immutableCache.get(edge);
-        if (result != null) {
-            InputEdge edge2 = result.get();
-            if (edge2 != null) {
-                return edge2;
-            }
-        }
-        immutableCache.put(edge, new WeakReference<>(edge));
-        return edge;
-    }
-
-    public InputEdge(char fromIndex, char toIndex, int from, int to, String label, String type, State state) {
-        this.toIndex = toIndex;
-        this.fromIndex = fromIndex;
-        this.from = from;
-        this.to = to;
-        this.state = state;
-        this.label = label;
-        this.type = type;
-    }
-
     public State getState() {
         return state;
     }
@@ -154,14 +112,14 @@ public class InputEdge {
 
     @Override
     public boolean equals(Object o) {
-        if (o == null || !(o instanceof InputEdge)) {
+        if (!(o instanceof InputEdge)) {
             return false;
         }
         InputEdge conn2 = (InputEdge) o;
         boolean result = conn2.fromIndex == fromIndex && conn2.toIndex == toIndex && conn2.from == from && conn2.to == to;
         if (result && (state == State.IMMUTABLE || conn2.state == State.IMMUTABLE)) {
             // Immutable instances must be exactly the same
-            return conn2.label == label && conn2.state == state;
+            return Objects.equals(conn2.label, label) && conn2.state == state;
         }
         return result;
     }

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/InputGraph.java

@@ -31,13 +31,13 @@ import java.util.*;
  */
 public class InputGraph extends Properties.Entity implements FolderElement {
 
-    private Map<Integer, InputNode> nodes;
+    private final Map<Integer, InputNode> nodes;
-    private List<InputEdge> edges;
+    private final List<InputEdge> edges;
     private Folder parent;
     private Group parentGroup;
-    private Map<String, InputBlock> blocks;
+    private final Map<String, InputBlock> blocks;
-    private List<InputBlockEdge> blockEdges;
+    private final List<InputBlockEdge> blockEdges;
-    private Map<Integer, InputBlock> nodeToBlock;
+    private final Map<Integer, InputBlock> nodeToBlock;
     private boolean isDiffGraph;
     private InputGraph firstGraph;
     private InputGraph secondGraph;
@@ -64,7 +64,7 @@ public class InputGraph extends Properties.Entity implements FolderElement {
     }
 
     public boolean isDiffGraph() {
-        return this.isDiffGraph;
+        return isDiffGraph;
     }
 
     public InputGraph getFirstGraph() {
@@ -114,7 +114,7 @@ public class InputGraph extends Properties.Entity implements FolderElement {
     public Map<InputNode, List<InputEdge>> findAllOutgoingEdges() {
         Map<InputNode, List<InputEdge>> result = new HashMap<>(getNodes().size());
         for(InputNode n : this.getNodes()) {
-            result.put(n, new ArrayList<InputEdge>());
+            result.put(n, new ArrayList<>());
         }
 
         for(InputEdge e : this.edges) {
@@ -175,16 +175,6 @@ public class InputGraph extends Properties.Entity implements FolderElement {
         nodeToBlock.clear();
     }
 
-    public void setEdge(int fromIndex, int toIndex, int from, int to) {
-        assert fromIndex == ((char)fromIndex) : "Downcast must be safe";
-        assert toIndex == ((char)toIndex) : "Downcast must be safe";
-
-        InputEdge edge = new InputEdge((char)fromIndex, (char)toIndex, from, to);
-        if(!this.getEdges().contains(edge)) {
-            this.addEdge(edge);
-        }
-    }
-
     public void ensureNodesInBlocks() {
         InputBlock noBlock = null;
         Set<InputNode> scheduledNodes = new HashSet<>();
@@ -304,7 +294,7 @@ public class InputGraph extends Properties.Entity implements FolderElement {
 
     public InputBlock addArtificialBlock() {
         InputBlock b = addBlock("(no block)");
-        b.setArtificial(true);
+        b.setArtificial();
         return b;
     }
 

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/InputMethod.java

@@ -35,13 +35,13 @@ import java.util.regex.Pattern;
  */
 public class InputMethod extends Properties.Entity {
 
-    private String name;
+    private final String name;
-    private int bci;
+    private final int bci;
-    private String shortName;
+    private final String shortName;
-    private List<InputMethod> inlined;
+    private final List<InputMethod> inlined;
     private InputMethod parentMethod;
-    private Group group;
+    private final Group group;
-    private List<InputBytecode> bytecodes;
+    private final List<InputBytecode> bytecodes;
 
     @Override
     public int hashCode() {
@@ -55,10 +55,9 @@ public class InputMethod extends Properties.Entity {
 
     @Override
     public boolean equals(Object o) {
-        if (o == null || (!(o instanceof InputMethod))) {
+        if ((!(o instanceof InputMethod))) {
             return false;
         }
-
         final InputMethod im = (InputMethod) o;
         return name.equals(im.name) && bci == im.bci && shortName.equals(im.shortName) &&
                inlined.equals(im.inlined) && bytecodes.equals(im.bytecodes);

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/InputNode.java

@@ -23,10 +23,6 @@
  */
 package com.sun.hotspot.igv.data;
 
-import java.util.ArrayList;
-import java.util.Comparator;
-import java.util.List;
-
 /**
  *
  * @author Thomas Wuerthinger
@@ -34,37 +30,6 @@ import java.util.List;
 public class InputNode extends Properties.Entity {
 
     private int id;
-    private List<InputGraph> subgraphs;
-
-    public static final Comparator<InputNode> COMPARATOR = new Comparator<InputNode>() {
-        @Override
-        public int compare(InputNode o1, InputNode o2) {
-            return o1.getId() - o2.getId();
-        }
-    };
-
-    public static Comparator<InputNode> getPropertyComparator(final String propertyName) {
-        return new Comparator<InputNode>() {
-
-            @Override
-            public int compare(InputNode o1, InputNode o2) {
-
-                int i1 = 0;
-                try {
-                    i1 = Integer.parseInt(o1.getProperties().get(propertyName));
-                } catch(NumberFormatException e) {
-                }
-
-                int i2 = 0;
-                try {
-                    i2 = Integer.parseInt(o2.getProperties().get(propertyName));
-                } catch(NumberFormatException e) {
-                }
-
-                return i1 - i2;
-            }
-        };
-    }
 
     public InputNode(InputNode n) {
         super(n);
@@ -83,17 +48,6 @@ public class InputNode extends Properties.Entity {
         return id;
     }
 
-    public void addSubgraph(InputGraph graph) {
-        if (subgraphs == null) {
-            subgraphs = new ArrayList<>();
-        }
-        subgraphs.add(graph);
-    }
-
-    public List<InputGraph> getSubgraphs() {
-        return subgraphs;
-    }
-
     @Override
     public boolean equals(Object o) {
         if (!(o instanceof InputNode)) {

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/Pair.java

@@ -58,7 +58,7 @@ public class Pair<L, R> {
 
     @Override
     public boolean equals(Object o) {
-        if (o == null || !(o instanceof Pair)) {
+        if (!(o instanceof Pair<?, ?>)) {
             return false;
         }
         Pair<?, ?> obj = (Pair<?, ?>) o;

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/Properties.java

@@ -26,7 +26,6 @@ package com.sun.hotspot.igv.data;
 import java.io.Serializable;
 import java.lang.ref.WeakReference;
 import java.util.*;
-import java.util.Map.Entry;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import java.util.regex.PatternSyntaxException;
@@ -188,7 +187,7 @@ public class Properties implements Serializable, Iterable<Property> {
 
     public static class InvertPropertyMatcher implements PropertyMatcher {
 
-        private PropertyMatcher matcher;
+        private final PropertyMatcher matcher;
 
         public InvertPropertyMatcher(PropertyMatcher matcher) {
             this.matcher = matcher;
@@ -210,8 +209,8 @@ public class Properties implements Serializable, Iterable<Property> {
 
     public static class StringPropertyMatcher implements PropertyMatcher {
 
-        private String name;
+        private final String name;
-        private String value;
+        private final String value;
 
         public StringPropertyMatcher(String name, String value) {
             if (name == null) {
@@ -240,8 +239,8 @@ public class Properties implements Serializable, Iterable<Property> {
 
     public static class RegexpPropertyMatcher implements PropertyMatcher {
 
-        private String name;
+        private final String name;
-        private Pattern valuePattern;
+        private final Pattern valuePattern;
 
         public RegexpPropertyMatcher(String name, String value) {
             this(name, value, 0);
@@ -312,13 +311,10 @@ public class Properties implements Serializable, Iterable<Property> {
             }
         }
 
-        pairs.sort(new Comparator<String[]>() {
+        pairs.sort((o1, o2) -> {
-            @Override
-            public int compare(String[] o1, String[] o2) {
             assert o1.length == 2;
             assert o2.length == 2;
             return o1[0].compareTo(o2[0]);
-            }
         });
 
         StringBuilder sb = new StringBuilder();
@@ -337,7 +333,7 @@ public class Properties implements Serializable, Iterable<Property> {
 
     public static class PropertySelector<T extends Properties.Provider> {
 
-        private Collection<T> objects;
+        private final Collection<T> objects;
 
         public PropertySelector(Collection<T> objects) {
             this.objects = objects;

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/Property.java

@@ -32,8 +32,8 @@ import java.io.Serializable;
 public class Property implements Serializable {
 
     public static final long serialVersionUID = 1L;
-    private String name;
+    private final String name;
-    private String value;
+    private final String value;
 
     Property(String name, String value) {
         this.name = name;

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/Source.java

@@ -31,8 +31,8 @@ import java.util.*;
  */
 public class Source {
 
-    private List<InputNode> sourceNodes;
+    private final List<InputNode> sourceNodes;
-    private Set<Integer> set;
+    private final Set<Integer> set;
 
     public Source() {
         sourceNodes = new ArrayList<>(1);
@@ -56,12 +56,7 @@ public class Source {
 
     public interface Provider {
 
-        public Source getSource();
+        Source getSource();
     }
 
-    public void addSourceNodes(Source s) {
-        for (InputNode n : s.getSourceNodes()) {
-            addSourceNode(n);
-        }
-    }
 }

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/serialization/BinaryParser.java

@@ -1,937 +0,0 @@
-/*
- * Copyright (c) 2012, 2021, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.  Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-package com.sun.hotspot.igv.data.serialization;
-
-import com.sun.hotspot.igv.data.*;
-import com.sun.hotspot.igv.data.Properties;
-import com.sun.hotspot.igv.data.services.GroupCallback;
-import java.io.EOFException;
-import java.io.IOException;
-import java.nio.ByteBuffer;
-import java.nio.channels.ReadableByteChannel;
-import java.util.*;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-import javax.swing.SwingUtilities;
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
-
-import static java.nio.charset.StandardCharsets.UTF_8;
-
-public class BinaryParser implements GraphParser {
-    private static final int BEGIN_GROUP = 0x00;
-    private static final int BEGIN_GRAPH = 0x01;
-    private static final int CLOSE_GROUP = 0x02;
-
-    private static final int POOL_NEW = 0x00;
-    private static final int POOL_STRING = 0x01;
-    private static final int POOL_ENUM = 0x02;
-    private static final int POOL_CLASS = 0x03;
-    private static final int POOL_METHOD = 0x04;
-    private static final int POOL_NULL = 0x05;
-    private static final int POOL_NODE_CLASS = 0x06;
-    private static final int POOL_FIELD = 0x07;
-    private static final int POOL_SIGNATURE = 0x08;
-
-    private static final int KLASS = 0x00;
-    private static final int ENUM_KLASS = 0x01;
-
-    private static final int PROPERTY_POOL = 0x00;
-    private static final int PROPERTY_INT = 0x01;
-    private static final int PROPERTY_LONG = 0x02;
-    private static final int PROPERTY_DOUBLE = 0x03;
-    private static final int PROPERTY_FLOAT = 0x04;
-    private static final int PROPERTY_TRUE = 0x05;
-    private static final int PROPERTY_FALSE = 0x06;
-    private static final int PROPERTY_ARRAY = 0x07;
-    private static final int PROPERTY_SUBGRAPH = 0x08;
-
-    private static final String NO_BLOCK = "noBlock";
-
-    private final GroupCallback callback;
-    private final List<Object> constantPool;
-    private final ByteBuffer buffer;
-    private final ReadableByteChannel channel;
-    private final GraphDocument rootDocument;
-    private final Deque<Folder> folderStack;
-    private final Deque<byte[]> hashStack;
-    private final ParseMonitor monitor;
-
-    private MessageDigest digest;
-
-    private enum Length {
-        S,
-        M,
-        L
-    }
-
-    private interface LengthToString {
-        String toString(Length l);
-    }
-
-    private abstract static class Member implements LengthToString {
-        public final Klass holder;
-        public final int accessFlags;
-        public final String name;
-        public Member(Klass holder, String name, int accessFlags) {
-            this.holder = holder;
-            this.accessFlags = accessFlags;
-            this.name = name;
-        }
-    }
-
-    private static class Method extends Member {
-        public final Signature signature;
-        public final byte[] code;
-        public Method(String name, Signature signature, byte[] code, Klass holder, int accessFlags) {
-            super(holder, name, accessFlags);
-            this.signature = signature;
-            this.code = code;
-        }
-        @Override
-        public String toString() {
-            StringBuilder sb = new StringBuilder();
-            sb.append(holder).append('.').append(name).append('(');
-            for (int i = 0; i < signature.argTypes.length; i++) {
-                if (i > 0) {
-                    sb.append(", ");
-                }
-                sb.append(signature.argTypes[i]);
-            }
-            sb.append(')');
-            return sb.toString();
-        }
-        @Override
-        public String toString(Length l) {
-            switch(l) {
-                case M:
-                    return holder.toString(Length.L) + "." + name;
-                case S:
-                    return holder.toString(Length.S) + "." + name;
-                default:
-                case L:
-                    return toString();
-            }
-        }
-    }
-
-    private static class Signature {
-        public final String returnType;
-        public final String[] argTypes;
-        public Signature(String returnType, String[] argTypes) {
-            this.returnType = returnType;
-            this.argTypes = argTypes;
-        }
-    }
-
-    private static class Field extends Member {
-        public final String type;
-        public Field(String type, Klass holder, String name, int accessFlags) {
-            super(holder, name, accessFlags);
-            this.type = type;
-        }
-        @Override
-        public String toString() {
-            return holder + "." + name;
-        }
-        @Override
-        public String toString(Length l) {
-            switch(l) {
-                case M:
-                    return holder.toString(Length.L) + "." + name;
-                case S:
-                    return holder.toString(Length.S) + "." + name;
-                default:
-                case L:
-                    return toString();
-            }
-        }
-    }
-
-    private static class Klass implements LengthToString {
-        public final String name;
-        public final String simpleName;
-        public Klass(String name) {
-            this.name = name;
-            String simple;
-            try {
-                simple = name.substring(name.lastIndexOf('.') + 1);
-            } catch (IndexOutOfBoundsException ioobe) {
-                simple = name;
-            }
-            this.simpleName = simple;
-        }
-        @Override
-        public String toString() {
-            return name;
-        }
-        @Override
-        public String toString(Length l) {
-            switch(l) {
-                case S:
-                    return simpleName;
-                default:
-                case L:
-                case M:
-                    return toString();
-            }
-        }
-    }
-
-    private static class EnumKlass extends Klass {
-        public final String[] values;
-        public EnumKlass(String name, String[] values) {
-            super(name);
-            this.values = values;
-        }
-    }
-
-    private static class Port {
-        public final boolean isList;
-        public final String name;
-        private Port(boolean isList, String name) {
-            this.isList = isList;
-            this.name = name;
-        }
-    }
-
-    private static class TypedPort extends Port {
-        public final EnumValue type;
-        private TypedPort(boolean isList, String name, EnumValue type) {
-            super(isList, name);
-            this.type = type;
-        }
-    }
-
-    private static class NodeClass {
-        public final String className;
-        public final String nameTemplate;
-        public final List<TypedPort> inputs;
-        public final List<Port> sux;
-        private NodeClass(String className, String nameTemplate, List<TypedPort> inputs, List<Port> sux) {
-            this.className = className;
-            this.nameTemplate = nameTemplate;
-            this.inputs = inputs;
-            this.sux = sux;
-        }
-        @Override
-        public String toString() {
-            return className;
-        }
-    }
-
-    private static class EnumValue implements LengthToString {
-        public EnumKlass enumKlass;
-        public int ordinal;
-        public EnumValue(EnumKlass enumKlass, int ordinal) {
-            this.enumKlass = enumKlass;
-            this.ordinal = ordinal;
-        }
-        @Override
-        public String toString() {
-            return enumKlass.simpleName + "." + enumKlass.values[ordinal];
-        }
-        @Override
-        public String toString(Length l) {
-            switch(l) {
-                case S:
-                    return enumKlass.values[ordinal];
-                default:
-                case M:
-                case L:
-                    return toString();
-            }
-        }
-    }
-
-    public BinaryParser(ReadableByteChannel channel, ParseMonitor monitor, GraphDocument rootDocument, GroupCallback callback) {
-        this.callback = callback;
-        constantPool = new ArrayList<>();
-        buffer = ByteBuffer.allocateDirect(256 * 1024);
-        buffer.flip();
-        this.channel = channel;
-        this.rootDocument = rootDocument;
-        folderStack = new LinkedList<>();
-        hashStack = new LinkedList<>();
-        this.monitor = monitor;
-        try {
-            this.digest = MessageDigest.getInstance("SHA-1");
-        } catch (NoSuchAlgorithmException e) {
-        }
-    }
-
-    private void fill() throws IOException {
-        // All the data between lastPosition and position has been
-        // used so add it to the digest.
-        int position = buffer.position();
-        buffer.position(lastPosition);
-        byte[] remaining = new byte[position - buffer.position()];
-        buffer.get(remaining);
-        digest.update(remaining);
-        assert position == buffer.position();
-
-        buffer.compact();
-        if (channel.read(buffer) < 0) {
-            throw new EOFException();
-        }
-        buffer.flip();
-        lastPosition = buffer.position();
-    }
-
-    private void ensureAvailable(int i) throws IOException {
-        if (i > buffer.capacity()) {
-            throw new IllegalArgumentException(String.format("Can not request %d bytes: buffer capacity is %d", i, buffer.capacity()));
-        }
-        while (buffer.remaining() < i) {
-            fill();
-        }
-    }
-
-    private int readByte() throws IOException {
-        ensureAvailable(1);
-        return ((int)buffer.get()) & 0xff;
-    }
-
-    private int readInt() throws IOException {
-        ensureAvailable(4);
-        return buffer.getInt();
-    }
-
-    private char readShort() throws IOException {
-        ensureAvailable(2);
-        return buffer.getChar();
-    }
-
-    private long readLong() throws IOException {
-        ensureAvailable(8);
-        return buffer.getLong();
-    }
-
-    private double readDouble() throws IOException {
-        ensureAvailable(8);
-        return buffer.getDouble();
-    }
-
-    private float readFloat() throws IOException {
-        ensureAvailable(4);
-        return buffer.getFloat();
-    }
-
-    private String readString() throws IOException {
-        return new String(readBytes(), UTF_8).intern();
-    }
-
-    private byte[] readBytes() throws IOException {
-        int len = readInt();
-        if (len < 0) {
-            return null;
-        }
-        byte[] b = new byte[len];
-        int bytesRead = 0;
-        while (bytesRead < b.length) {
-            int toRead = Math.min(b.length - bytesRead, buffer.capacity());
-            ensureAvailable(toRead);
-            buffer.get(b, bytesRead, toRead);
-            bytesRead += toRead;
-        }
-        return b;
-    }
-
-    private String readIntsToString() throws IOException {
-        int len = readInt();
-        if (len < 0) {
-            return "null";
-        }
-        ensureAvailable(len * 4);
-        StringBuilder sb = new StringBuilder().append('[');
-        for (int i = 0; i < len; i++) {
-            sb.append(buffer.getInt());
-            if (i < len - 1) {
-                sb.append(", ");
-            }
-        }
-        sb.append(']');
-        return sb.toString().intern();
-    }
-
-    private String readDoublesToString() throws IOException {
-        int len = readInt();
-        if (len < 0) {
-            return "null";
-        }
-        ensureAvailable(len * 8);
-        StringBuilder sb = new StringBuilder().append('[');
-        for (int i = 0; i < len; i++) {
-            sb.append(buffer.getDouble());
-            if (i < len - 1) {
-                sb.append(", ");
-            }
-        }
-        sb.append(']');
-        return sb.toString().intern();
-    }
-
-    private String readPoolObjectsToString() throws IOException {
-        int len = readInt();
-        if (len < 0) {
-            return "null";
-        }
-        StringBuilder sb = new StringBuilder().append('[');
-        for (int i = 0; i < len; i++) {
-            sb.append(readPoolObject(Object.class));
-            if (i < len - 1) {
-                sb.append(", ");
-            }
-        }
-        sb.append(']');
-        return sb.toString().intern();
-    }
-
-    private <T> T readPoolObject(Class<T> klass) throws IOException {
-        int type = readByte();
-        if (type == POOL_NULL) {
-            return null;
-        }
-        if (type == POOL_NEW) {
-            return (T) addPoolEntry(klass);
-        }
-        assert assertObjectType(klass, type);
-        char index = readShort();
-        if (index < 0 || index >= constantPool.size()) {
-            throw new IOException("Invalid constant pool index : " + index);
-        }
-        Object obj = constantPool.get(index);
-        return (T) obj;
-    }
-
-    private boolean assertObjectType(Class<?> klass, int type) {
-        switch(type) {
-            case POOL_CLASS:
-                return klass.isAssignableFrom(EnumKlass.class);
-            case POOL_ENUM:
-                return klass.isAssignableFrom(EnumValue.class);
-            case POOL_METHOD:
-                return klass.isAssignableFrom(Method.class);
-            case POOL_STRING:
-                return klass.isAssignableFrom(String.class);
-            case POOL_NODE_CLASS:
-                return klass.isAssignableFrom(NodeClass.class);
-            case POOL_FIELD:
-                return klass.isAssignableFrom(Field.class);
-            case POOL_SIGNATURE:
-                return klass.isAssignableFrom(Signature.class);
-            case POOL_NULL:
-                return true;
-            default:
-                return false;
-        }
-    }
-
-    private Object addPoolEntry(Class<?> klass) throws IOException {
-        char index = readShort();
-        int type = readByte();
-        assert assertObjectType(klass, type) : "Wrong object type : " + klass + " != " + type;
-        Object obj;
-        switch(type) {
-            case POOL_CLASS: {
-                String name = readString();
-                int klasstype = readByte();
-                if (klasstype == ENUM_KLASS) {
-                    int len = readInt();
-                    String[] values = new String[len];
-                    for (int i = 0; i < len; i++) {
-                        values[i] = readPoolObject(String.class);
-                    }
-                    obj = new EnumKlass(name, values);
-                } else if (klasstype == KLASS) {
-                    obj = new Klass(name);
-                } else {
-                    throw new IOException("unknown klass type : " + klasstype);
-                }
-                break;
-            }
-            case POOL_ENUM: {
-                EnumKlass enumClass = readPoolObject(EnumKlass.class);
-                int ordinal = readInt();
-                obj = new EnumValue(enumClass, ordinal);
-                break;
-            }
-            case POOL_NODE_CLASS: {
-                String className = readString();
-                String nameTemplate = readString();
-                int inputCount = readShort();
-                List<TypedPort> inputs = new ArrayList<>(inputCount);
-                for (int i = 0; i < inputCount; i++) {
-                    boolean isList = readByte() != 0;
-                    String name = readPoolObject(String.class);
-                    EnumValue inputType = readPoolObject(EnumValue.class);
-                    inputs.add(new TypedPort(isList, name, inputType));
-                }
-                int suxCount = readShort();
-                List<Port> sux = new ArrayList<>(suxCount);
-                for (int i = 0; i < suxCount; i++) {
-                    boolean isList = readByte() != 0;
-                    String name = readPoolObject(String.class);
-                    sux.add(new Port(isList, name));
-                }
-                obj = new NodeClass(className, nameTemplate, inputs, sux);
-                break;
-            }
-            case POOL_METHOD: {
-                Klass holder = readPoolObject(Klass.class);
-                String name = readPoolObject(String.class);
-                Signature sign = readPoolObject(Signature.class);
-                int flags = readInt();
-                byte[] code = readBytes();
-                obj = new Method(name, sign, code, holder, flags);
-                break;
-            }
-            case POOL_FIELD: {
-                Klass holder = readPoolObject(Klass.class);
-                String name = readPoolObject(String.class);
-                String fType = readPoolObject(String.class);
-                int flags = readInt();
-                obj = new Field(fType, holder, name, flags);
-                break;
-            }
-            case POOL_SIGNATURE: {
-                int argc = readShort();
-                String[] args = new String[argc];
-                for (int i = 0; i < argc; i++) {
-                    args[i] = readPoolObject(String.class);
-                }
-                String returnType = readPoolObject(String.class);
-                obj = new Signature(returnType, args);
-                break;
-            }
-            case POOL_STRING: {
-                obj = readString();
-                break;
-            }
-            default:
-                throw new IOException("unknown pool type");
-        }
-        while (constantPool.size() <= index) {
-            constantPool.add(null);
-        }
-        constantPool.set(index, obj);
-        return obj;
-    }
-
-    private Object readPropertyObject() throws IOException {
-        int type = readByte();
-        switch (type) {
-            case PROPERTY_INT:
-                return readInt();
-            case PROPERTY_LONG:
-                return readLong();
-            case PROPERTY_FLOAT:
-                return readFloat();
-            case PROPERTY_DOUBLE:
-                return readDouble();
-            case PROPERTY_TRUE:
-                return Boolean.TRUE;
-            case PROPERTY_FALSE:
-                return Boolean.FALSE;
-            case PROPERTY_POOL:
-                return readPoolObject(Object.class);
-            case PROPERTY_ARRAY:
-                int subType = readByte();
-                switch(subType) {
-                    case PROPERTY_INT:
-                        return readIntsToString();
-                    case PROPERTY_DOUBLE:
-                        return readDoublesToString();
-                    case PROPERTY_POOL:
-                        return readPoolObjectsToString();
-                    default:
-                        throw new IOException("Unknown type");
-                }
-            case PROPERTY_SUBGRAPH:
-                InputGraph graph = parseGraph("");
-                new Group(null).addElement(graph);
-                return graph;
-            default:
-                throw new IOException("Unknown type");
-        }
-    }
-
-    @Override
-    public GraphDocument parse() throws IOException {
-        folderStack.push(rootDocument);
-        hashStack.push(null);
-        if (monitor != null) {
-            monitor.setState("Starting parsing");
-        }
-        try {
-            while(true) {
-                parseRoot();
-            }
-        } catch (EOFException e) {
-
-        }
-        if (monitor != null) {
-            monitor.setState("Finished parsing");
-        }
-        return rootDocument;
-    }
-
-    private void parseRoot() throws IOException {
-        int type = readByte();
-        switch(type) {
-            case BEGIN_GRAPH: {
-                final Folder parent = folderStack.peek();
-                final InputGraph graph = parseGraph();
-                SwingUtilities.invokeLater(new Runnable(){
-                    @Override
-                    public void run() {
-                        parent.addElement(graph);
-                    }
-                });
-                break;
-            }
-            case BEGIN_GROUP: {
-                final Folder parent = folderStack.peek();
-                final Group group = parseGroup(parent);
-                if (callback == null || parent instanceof Group) {
-                    SwingUtilities.invokeLater(new Runnable(){
-                        @Override
-                        public void run() {
-                            parent.addElement(group);
-                        }
-                    });
-                }
-                folderStack.push(group);
-                hashStack.push(null);
-                if (callback != null && parent instanceof GraphDocument) {
-                    callback.started(group);
-                }
-                break;
-            }
-            case CLOSE_GROUP: {
-                if (folderStack.isEmpty()) {
-                    throw new IOException("Unbalanced groups");
-                }
-                folderStack.pop();
-                hashStack.pop();
-                break;
-            }
-            default:
-                throw new IOException("unknown root : " + type);
-        }
-    }
-
-    private Group parseGroup(Folder parent) throws IOException {
-        String name = readPoolObject(String.class);
-        String shortName = readPoolObject(String.class);
-        if (monitor != null) {
-            monitor.setState(shortName);
-        }
-        Method method = readPoolObject(Method.class);
-        int bci = readInt();
-        Group group = new Group(parent);
-        group.getProperties().setProperty("name", name);
-        parseProperties(group.getProperties());
-        if (method != null) {
-            InputMethod inMethod = new InputMethod(group, method.name, shortName, bci);
-            inMethod.setBytecodes("TODO");
-            group.setMethod(inMethod);
-        }
-        return group;
-    }
-
-    int lastPosition = 0;
-
-    private InputGraph parseGraph() throws IOException {
-        if (monitor != null) {
-            monitor.updateProgress();
-        }
-        String title = readPoolObject(String.class);
-        digest.reset();
-        lastPosition = buffer.position();
-        InputGraph graph = parseGraph(title);
-
-        int position = buffer.position();
-        buffer.position(lastPosition);
-        byte[] remaining = new byte[position - buffer.position()];
-        buffer.get(remaining);
-        digest.update(remaining);
-        assert position == buffer.position();
-        lastPosition = buffer.position();
-
-        byte[] d = digest.digest();
-        byte[] hash = hashStack.peek();
-        if (hash != null && Arrays.equals(hash, d)) {
-            graph.getProperties().setProperty("_isDuplicate", "true");
-        } else {
-            hashStack.pop();
-            hashStack.push(d);
-        }
-        return graph;
-    }
-
-    private void parseProperties(Properties properties) throws IOException {
-        int propCount = readShort();
-        for (int j = 0; j < propCount; j++) {
-            String key = readPoolObject(String.class);
-            Object value = readPropertyObject();
-            properties.setProperty(key, value != null ? value.toString() : "null");
-        }
-    }
-
-    private InputGraph parseGraph(String title) throws IOException {
-        InputGraph graph = new InputGraph(title);
-        parseProperties(graph.getProperties());
-        parseNodes(graph);
-        parseBlocks(graph);
-        graph.ensureNodesInBlocks();
-        for (InputNode node : graph.getNodes()) {
-            node.internProperties();
-        }
-        return graph;
-    }
-
-    private void parseBlocks(InputGraph graph) throws IOException {
-        int blockCount = readInt();
-        List<Edge> edges = new LinkedList<>();
-        for (int i = 0; i < blockCount; i++) {
-            int id = readInt();
-            String name = id >= 0 ? Integer.toString(id) : NO_BLOCK;
-            InputBlock block = graph.addBlock(name);
-            int nodeCount = readInt();
-            for (int j = 0; j < nodeCount; j++) {
-                int nodeId = readInt();
-                if (nodeId < 0) {
-                    continue;
-                }
-                final Properties properties = graph.getNode(nodeId).getProperties();
-                final String oldBlock = properties.get("block");
-                if(oldBlock != null) {
-                    properties.setProperty("block", oldBlock + ", " + name);
-                } else {
-                    block.addNode(nodeId);
-                    properties.setProperty("block", name);
-                }
-            }
-            int edgeCount = readInt();
-            for (int j = 0; j < edgeCount; j++) {
-                int to = readInt();
-                edges.add(new Edge(id, to));
-            }
-        }
-        for (Edge e : edges) {
-            String fromName = e.from >= 0 ? Integer.toString(e.from) : NO_BLOCK;
-            String toName = e.to >= 0 ? Integer.toString(e.to) : NO_BLOCK;
-            graph.addBlockEdge(graph.getBlock(fromName), graph.getBlock(toName));
-        }
-    }
-
-    private void parseNodes(InputGraph graph) throws IOException {
-        int count = readInt();
-        Map<String, Object> props = new HashMap<>();
-        List<Edge> inputEdges = new ArrayList<>(count);
-        List<Edge> succEdges = new ArrayList<>(count);
-        for (int i = 0; i < count; i++) {
-            int id = readInt();
-            InputNode node = new InputNode(id);
-            final Properties properties = node.getProperties();
-            NodeClass nodeClass = readPoolObject(NodeClass.class);
-            int preds = readByte();
-            if (preds > 0) {
-                properties.setProperty("hasPredecessor", "true");
-            }
-            properties.setProperty("idx", Integer.toString(id));
-            int propCount = readShort();
-            for (int j = 0; j < propCount; j++) {
-                String key = readPoolObject(String.class);
-                if (key.equals("hasPredecessor") || key.equals("name") || key.equals("class") || key.equals("id") || key.equals("idx")) {
-                    key = "!data." + key;
-                }
-                Object value = readPropertyObject();
-                if (value instanceof InputGraph) {
-                    InputGraph subgraph = (InputGraph) value;
-                    subgraph.getProperties().setProperty("name", node.getId() + ":" + key);
-                    node.addSubgraph((InputGraph) value);
-                } else {
-                    properties.setProperty(key, value != null ? value.toString() : "null");
-                    props.put(key, value);
-                }
-            }
-            ArrayList<Edge> currentEdges = new ArrayList<>();
-            int portNum = 0;
-            for (TypedPort p : nodeClass.inputs) {
-                if (p.isList) {
-                    int size = readShort();
-                    for (int j = 0; j < size; j++) {
-                        int in = readInt();
-                        if (in >= 0) {
-                            Edge e = new Edge(in, id, (char) (preds + portNum), p.name + "[" + j + "]", p.type.toString(Length.S), true);
-                            currentEdges.add(e);
-                            inputEdges.add(e);
-                            portNum++;
-                        }
-                    }
-                } else {
-                    int in = readInt();
-                    if (in >= 0) {
-                        Edge e = new Edge(in, id, (char) (preds + portNum), p.name, p.type.toString(Length.S), true);
-                        currentEdges.add(e);
-                        inputEdges.add(e);
-                        portNum++;
-                    }
-                }
-
-            }
-            portNum = 0;
-            for (Port p : nodeClass.sux) {
-                if (p.isList) {
-                    int size = readShort();
-                    for (int j = 0; j < size; j++) {
-                        int sux = readInt();
-                        if (sux >= 0) {
-                            Edge e = new Edge(id, sux, (char) portNum, p.name + "[" + j + "]", "Successor", false);
-                            currentEdges.add(e);
-                            succEdges.add(e);
-                            portNum++;
-                        }
-                    }
-                } else {
-                    int sux = readInt();
-                    if (sux >= 0) {
-                        Edge e = new Edge(id, sux, (char) portNum, p.name, "Successor", false);
-                        currentEdges.add(e);
-                        succEdges.add(e);
-                        portNum++;
-                    }
-                }
-            }
-            properties.setProperty("name", createName(currentEdges, props, nodeClass.nameTemplate));
-            properties.setProperty("class", nodeClass.className);
-            switch (nodeClass.className) {
-                case "BeginNode":
-                    properties.setProperty("shortName", "B");
-                    break;
-                case "EndNode":
-                    properties.setProperty("shortName", "E");
-                    break;
-            }
-            graph.addNode(node);
-            props.clear();
-        }
-
-        Set<InputNode> nodesWithSuccessor = new HashSet<>();
-
-        for (Edge e : succEdges) {
-            assert !e.input;
-            char fromIndex = e.num;
-            nodesWithSuccessor.add(graph.getNode(e.from));
-            char toIndex = 0;
-            graph.addEdge(InputEdge.createImmutable(fromIndex, toIndex, e.from, e.to, e.label, e.type));
-        }
-        for (Edge e : inputEdges) {
-            assert e.input;
-            char fromIndex = (char) (nodesWithSuccessor.contains(graph.getNode(e.from)) ? 1 : 0);
-            char toIndex = e.num;
-            graph.addEdge(InputEdge.createImmutable(fromIndex, toIndex, e.from, e.to, e.label, e.type));
-        }
-    }
-
-    static final Pattern templatePattern = Pattern.compile("\\{(p|i)#([a-zA-Z0-9$_]+)(/(l|m|s))?\\}");
-
-    private String createName(List<Edge> edges, Map<String, Object> properties, String template) {
-        Matcher m = templatePattern.matcher(template);
-        StringBuffer sb = new StringBuffer();
-        while (m.find()) {
-            String name = m.group(2);
-            String type = m.group(1);
-            String result;
-            switch (type) {
-                case "i":
-                    StringBuilder inputString = new StringBuilder();
-                    for(Edge edge : edges) {
-                        if (edge.label.startsWith(name) && (name.length() == edge.label.length() || edge.label.charAt(name.length()) == '[')) {
-                            if (inputString.length() > 0) {
-                                inputString.append(", ");
-                            }
-                            inputString.append(edge.from);
-                        }
-                    }
-                    result = inputString.toString();
-                    break;
-                case "p":
-                    Object prop = properties.get(name);
-                    String length = m.group(4);
-                    if (prop == null) {
-                        result = "?";
-                    } else if (length != null && prop instanceof LengthToString) {
-                        LengthToString lengthProp = (LengthToString) prop;
-                        switch(length) {
-                            default:
-                            case "l":
-                                result = lengthProp.toString(Length.L);
-                                break;
-                            case "m":
-                                result = lengthProp.toString(Length.M);
-                                break;
-                            case "s":
-                                result = lengthProp.toString(Length.S);
-                                break;
-                        }
-                    } else {
-                        result = prop.toString();
-                    }
-                    break;
-                default:
-                    result = "#?#";
-                    break;
-            }
-            result = result.replace("\\", "\\\\");
-            result = result.replace("$", "\\$");
-            m.appendReplacement(sb, result);
-        }
-        m.appendTail(sb);
-        return sb.toString().intern();
-    }
-
-    private static class Edge {
-        final int from;
-        final int to;
-        final char num;
-        final String label;
-        final String type;
-        final boolean input;
-        public Edge(int from, int to) {
-            this(from, to, (char) 0, null, null, false);
-        }
-        public Edge(int from, int to, char num, String label, String type, boolean input) {
-            this.from = from;
-            this.to = to;
-            this.label = label != null ? label.intern() : label;
-            this.type = type != null ? type.intern() : type;
-            this.num = num;
-            this.input = input;
-        }
-    }
-}

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/serialization/GraphParser.java

@@ -28,5 +28,5 @@ import com.sun.hotspot.igv.data.GraphDocument;
 import java.io.IOException;
 
 public interface GraphParser {
-    public GraphDocument parse() throws IOException;
+    GraphDocument parse() throws IOException;
 }

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/serialization/ParseMonitor.java

@@ -26,8 +26,8 @@ package com.sun.hotspot.igv.data.serialization;
 
 public interface ParseMonitor {
 
-    public void updateProgress();
+    void updateProgress();
 
-    public void setState(String state);
+    void setState(String state);
 
 }

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/serialization/Parser.java

@@ -29,7 +29,6 @@ import com.sun.hotspot.igv.data.serialization.XMLParser.HandoverElementHandler;
 import com.sun.hotspot.igv.data.serialization.XMLParser.TopElementHandler;
 import com.sun.hotspot.igv.data.services.GroupCallback;
 import java.io.IOException;
-import java.io.InputStream;
 import java.nio.channels.Channels;
 import java.nio.channels.ReadableByteChannel;
 import java.util.ArrayList;
@@ -39,9 +38,6 @@ import java.util.Map;
 import javax.swing.SwingUtilities;
 import javax.xml.parsers.ParserConfigurationException;
 import javax.xml.parsers.SAXParserFactory;
-import javax.xml.transform.Source;
-import javax.xml.transform.stream.StreamSource;
-import javax.xml.validation.SchemaFactory;
 import org.xml.sax.InputSource;
 import org.xml.sax.SAXException;
 import org.xml.sax.SAXParseException;
@@ -95,12 +91,12 @@ public class Parser implements GraphParser {
     public static final String SUCCESSOR_ELEMENT = "successor";
     public static final String ASSEMBLY_ELEMENT = "assembly";
     public static final String DIFFERENCE_PROPERTY = "difference";
-    private TopElementHandler<GraphDocument> xmlDocument = new TopElementHandler<>();
+    private final TopElementHandler<GraphDocument> xmlDocument = new TopElementHandler<>();
-    private Map<Group, Boolean> differenceEncoding = new HashMap<>();
+    private final Map<Group, Boolean> differenceEncoding = new HashMap<>();
-    private Map<Group, InputGraph> lastParsedGraph = new HashMap<>();
+    private final Map<Group, InputGraph> lastParsedGraph = new HashMap<>();
-    private GroupCallback groupCallback;
+    private final GroupCallback groupCallback;
-    private HashMap<String, Integer> idCache = new HashMap<>();
+    private final HashMap<String, Integer> idCache = new HashMap<>();
-    private ArrayList<Pair<String, String>> blockConnections = new ArrayList<>();
+    private final ArrayList<Pair<String, String>> blockConnections = new ArrayList<>();
     private int maxId = 0;
     private GraphDocument graphDocument;
     private final ParseMonitor monitor;
@@ -118,7 +114,7 @@ public class Parser implements GraphParser {
             id = maxId++;
             idCache.put(i, id);
         }
-        return id.intValue();
+        return id;
     }
 
     // <graphDocument>

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/serialization/Printer.java

@@ -36,7 +36,7 @@ import java.util.Set;
  */
 public class Printer {
 
-    private InputStream in;
+    private final InputStream in;
 
     public Printer() {
         this(null);
@@ -52,8 +52,7 @@ public class Printer {
 
         try {
             export(xmlWriter, document);
-        } catch (IOException ex) {
+        } catch (IOException ignored) {}
-        }
     }
 
     private void export(XMLWriter xmlWriter, GraphDocument document) throws IOException {

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/serialization/XMLParser.java

@@ -23,7 +23,6 @@
  */
 package com.sun.hotspot.igv.data.serialization;
 
-import com.sun.hotspot.igv.data.Properties;
 import java.util.HashMap;
 import java.util.Stack;
 import org.xml.sax.Attributes;
@@ -39,16 +38,10 @@ public class XMLParser implements ContentHandler {
 
     public static class MissingAttributeException extends SAXException {
 
-        private String name;
-
         public MissingAttributeException(String name) {
             super("Missing attribute \"" + name + "\"");
-            this.name = name;
         }
 
-        public String getAttributeName() {
-            return this.getMessage();
-        }
     }
 
     public static class HandoverElementHandler<P> extends ElementHandler<P, P> {
@@ -76,24 +69,20 @@ public class XMLParser implements ContentHandler {
 
     public static class ElementHandler<T, P> {
 
-        private String name;
+        private final String name;
-        private Stack<T> object = new Stack<>();
+        private final Stack<T> object = new Stack<>();
         private Attributes attr;
         private StringBuilder currentText;
         private ParseMonitor monitor;
-        private HashMap<String, ElementHandler<?, ? super T>> hashtable;
+        private final HashMap<String, ElementHandler<?, ? super T>> hashtable;
-        private boolean needsText;
+        private final boolean needsText;
-        private Stack<ElementHandler<P, ?>> parentElement = new Stack<>();
+        private final Stack<ElementHandler<P, ?>> parentElement = new Stack<>();
-        private Stack<P> parentObject = new Stack<>();
+        private final Stack<P> parentObject = new Stack<>();
 
         public ElementHandler(String name) {
             this(name, false);
         }
 
-        public ElementHandler<P, ?> getParentElement() {
-            return parentElement.peek();
-        }
-
         public P getParentObject() {
             return parentObject.peek();
         }
@@ -141,15 +130,6 @@ public class XMLParser implements ContentHandler {
             return s;
         }
 
-        public void processAttributesAsProperties(Properties p) {
-            int length = attr.getLength();
-            for (int i = 0; i < length; i++) {
-                String val = attr.getValue(i);
-                String localName = attr.getLocalName(i);
-                p.setProperty(val, localName);
-            }
-        }
-
         public void startElement(ElementHandler<P, ?> parentElement, Attributes attr, ParseMonitor monitor) throws SAXException {
             this.currentText = new StringBuilder();
             this.attr = attr;
@@ -179,8 +159,8 @@ public class XMLParser implements ContentHandler {
             currentText.append(c, start, length);
         }
     }
-    private Stack<ElementHandler> stack;
+    private final Stack<ElementHandler> stack;
-    private ParseMonitor monitor;
+    private final ParseMonitor monitor;
 
     public XMLParser(TopElementHandler rootHandler, ParseMonitor monitor) {
         this.stack = new Stack<>();

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/serialization/XMLWriter.java

@@ -36,8 +36,8 @@ import java.util.Stack;
  */
 public class XMLWriter extends Writer {
 
-    private Writer inner;
+    private final Writer inner;
-    private Stack<String> elementStack;
+    private final Stack<String> elementStack;
 
     public XMLWriter(Writer inner) {
         this.inner = inner;
@@ -114,7 +114,7 @@ public class XMLWriter extends Writer {
     }
 
     public void writeProperties(Properties props) throws IOException {
-        if (props.iterator().hasNext() == false) {
+        if (!props.iterator().hasNext()) {
             return;
         }
 

src/utils/IdealGraphVisualizer/Data/src/test/java/com/sun/hotspot/igv/data/ChangedEventTest.java

@@ -24,8 +24,8 @@
 
 package com.sun.hotspot.igv.data;
 
-import static org.junit.Assert.assertEquals;
 import org.junit.*;
+import static org.junit.Assert.assertEquals;
 
 /**
  *

src/utils/IdealGraphVisualizer/Data/src/test/java/com/sun/hotspot/igv/data/ControllableChangedListenerTest.java

@@ -24,8 +24,8 @@
 
 package com.sun.hotspot.igv.data;
 
-import static org.junit.Assert.*;
 import org.junit.*;
+import static org.junit.Assert.*;
 
 /**
  *

src/utils/IdealGraphVisualizer/Data/src/test/java/com/sun/hotspot/igv/data/GroupTest.java

@@ -26,8 +26,8 @@ package com.sun.hotspot.igv.data;
 
 import java.util.Arrays;
 import java.util.HashSet;
-import static org.junit.Assert.assertEquals;
 import org.junit.*;
+import static org.junit.Assert.assertEquals;
 
 /**
  *

src/utils/IdealGraphVisualizer/Data/src/test/java/com/sun/hotspot/igv/data/InputMethodTest.java

@@ -26,8 +26,8 @@ package com.sun.hotspot.igv.data;
 
 import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.CoreMatchers.nullValue;
-import static org.junit.Assert.assertThat;
 import org.junit.*;
+import static org.junit.Assert.assertThat;
 
 /**
  *

src/utils/IdealGraphVisualizer/Data/src/test/java/com/sun/hotspot/igv/data/PairTest.java

@@ -25,8 +25,8 @@
 
 package com.sun.hotspot.igv.data;
 
-import static org.junit.Assert.*;
 import org.junit.*;
+import static org.junit.Assert.*;
 
 /**
  *

src/utils/IdealGraphVisualizer/Data/src/test/java/com/sun/hotspot/igv/data/PropertiesTest.java

@@ -25,11 +25,7 @@
 
 package com.sun.hotspot.igv.data;
 
-import com.sun.hotspot.igv.data.Properties.InvertPropertyMatcher;
+import com.sun.hotspot.igv.data.Properties.*;
-import com.sun.hotspot.igv.data.Properties.PropertyMatcher;
-import com.sun.hotspot.igv.data.Properties.PropertySelector;
-import com.sun.hotspot.igv.data.Properties.RegexpPropertyMatcher;
-import com.sun.hotspot.igv.data.Properties.StringPropertyMatcher;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Iterator;

src/utils/IdealGraphVisualizer/Data/src/test/java/com/sun/hotspot/igv/data/PropertyTest.java

@@ -25,8 +25,8 @@
 
 package com.sun.hotspot.igv.data;
 
-import static org.junit.Assert.*;
 import org.junit.*;
+import static org.junit.Assert.*;
 
 /**
  *

src/utils/IdealGraphVisualizer/Data/src/test/java/com/sun/hotspot/igv/data/SourceTest.java

@@ -26,8 +26,8 @@ package com.sun.hotspot.igv.data;
 
 import java.util.Arrays;
 import java.util.LinkedHashSet;
-import static org.junit.Assert.assertEquals;
 import org.junit.*;
+import static org.junit.Assert.assertEquals;
 
 /**
  *

src/utils/IdealGraphVisualizer/Data/src/test/java/com/sun/hotspot/igv/data/Util.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -33,16 +33,6 @@ import static org.junit.Assert.*;
  */
 public class Util {
 
-    public static void assertGraphDocumentNotEquals(GraphDocument a, GraphDocument b) {
-        try {
-            assertGraphDocumentEquals(a, b);
-        } catch(AssertionError e) {
-            return;
-        }
-
-        fail("Graphs documents are equal!");
-    }
-
     public static void assertGraphDocumentEquals(GraphDocument a, GraphDocument b) {
 
         if (a.getElements().size() != b.getElements().size()) {
@@ -61,19 +51,9 @@ public class Util {
         }
     }
 
-    public static void assertGroupNotEquals(Group a, Group b) {
-        try {
-            assertGroupEquals(a, b);
-        } catch(AssertionError e) {
-            return;
-        }
-
-        fail("Groups are equal!");
-    }
-
     public static void assertGroupEquals(Group a, Group b) {
 
-        if (a.getGraphsCount() != b.getGraphsCount()) {
+        if (a.getElements().size() != b.getElements().size()) {
             fail();
         }
 

src/utils/IdealGraphVisualizer/Data/src/test/java/com/sun/hotspot/igv/data/serialization/ParserTest.java

@@ -26,15 +26,15 @@
 package com.sun.hotspot.igv.data.serialization;
 
 import com.sun.hotspot.igv.data.*;
-import java.io.*;
+import java.io.ByteArrayInputStream;
+import java.io.CharArrayWriter;
+import java.io.IOException;
+import java.io.InputStream;
 import java.nio.channels.Channels;
-
 import static java.nio.charset.StandardCharsets.UTF_8;
+import org.junit.*;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
-import org.junit.*;
-import org.openide.util.Exceptions;
-import org.xml.sax.InputSource;
 
 /**
  *

src/utils/IdealGraphVisualizer/Difference/src/main/java/com/sun/hotspot/igv/difference/Difference.java

@@ -287,9 +287,6 @@ public class Difference {
     }
 
     private static InputGraph createDiff(InputGraph a, InputGraph b) {
-
-        Set<InputNode> matched = new HashSet<>();
-
         Set<NodePair> pairs = new HashSet<>();
         for (InputNode n : a.getNodes()) {
             String s = n.getProperties().get(MAIN_PROPERTY);

src/utils/IdealGraphVisualizer/Filter/src/main/java/com/sun/hotspot/igv/filter/AbstractFilter.java

@@ -38,7 +38,7 @@ public abstract class AbstractFilter implements Filter {
     private Properties properties;
 
     public AbstractFilter() {
-        changedEvent = new ChangedEvent<Filter>(this);
+        changedEvent = new ChangedEvent<>(this);
         properties = new Properties();
     }
 

src/utils/IdealGraphVisualizer/Filter/src/main/java/com/sun/hotspot/igv/filter/ColorFilter.java

@@ -24,8 +24,8 @@
 package com.sun.hotspot.igv.filter;
 
 import com.sun.hotspot.igv.data.Properties;
-import com.sun.hotspot.igv.graph.Connection.ConnectionStyle;
 import com.sun.hotspot.igv.graph.*;
+import com.sun.hotspot.igv.graph.Connection.ConnectionStyle;
 import java.awt.Color;
 import java.util.ArrayList;
 import java.util.List;

src/utils/IdealGraphVisualizer/Filter/src/main/java/com/sun/hotspot/igv/filter/CombineFilter.java

@@ -74,7 +74,7 @@ public class CombineFilter extends AbstractFilter {
                             }
                         }
 
-                        slot.getSource().addSourceNodes(f.getSource());
+                        slot.getSource().addSourceNode(f.getInputNode());
                         if (r.getShortProperty() != null) {
                             String s = f.getProperties().get(r.getShortProperty());
                             if (s != null && s.length() > 0) {
@@ -130,7 +130,7 @@ public class CombineFilter extends AbstractFilter {
                                     pos = Integer.parseInt(succ.getProperties().get("con"));
                                 }
                                 OutputSlot slot = f.createOutputSlot(pos);
-                                slot.getSource().addSourceNodes(succ.getSource());
+                                slot.getSource().addSourceNode(succ.getInputNode());
                                 if (r.getShortProperty() != null) {
                                     String s = succ.getProperties().get(r.getShortProperty());
                                     if (s != null && s.length() > 0) {

src/utils/IdealGraphVisualizer/Filter/src/main/java/com/sun/hotspot/igv/filter/CustomFilter.java

@@ -25,7 +25,10 @@
 package com.sun.hotspot.igv.filter;
 
 import com.sun.hotspot.igv.graph.Diagram;
-import javax.script.*;
+import javax.script.Bindings;
+import javax.script.ScriptContext;
+import javax.script.ScriptEngine;
+import javax.script.ScriptException;
 import org.openide.cookies.OpenCookie;
 import org.openide.util.Exceptions;
 

src/utils/IdealGraphVisualizer/Filter/src/main/java/com/sun/hotspot/igv/filter/RemoveBlockFilter.java

@@ -23,9 +23,9 @@
  */
 package com.sun.hotspot.igv.filter;
 
-import com.sun.hotspot.igv.graph.Diagram;
 import com.sun.hotspot.igv.graph.Block;
 import com.sun.hotspot.igv.graph.BlockSelector;
+import com.sun.hotspot.igv.graph.Diagram;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;

src/utils/IdealGraphVisualizer/Filter/src/main/java/com/sun/hotspot/igv/filter/SplitFilter.java

@@ -56,9 +56,9 @@ public class SplitFilter extends AbstractFilter {
             for (InputSlot is : f.getInputSlots()) {
                 for (FigureConnection c : is.getConnections()) {
                     OutputSlot os = c.getOutputSlot();
-                    if (f.getSource().getSourceNodes().size() > 0) {
+                    if (f.getInputNode() != null) {
-                        os.getSource().addSourceNodes(f.getSource());
+                        os.getSource().addSourceNode(f.getInputNode());
-                        os.setAssociatedNode(f.getSource().getSourceNodes().get(0));
+                        os.setAssociatedNode(f.getInputNode());
                         os.setColor(f.getColor());
                     }
 
@@ -73,9 +73,9 @@ public class SplitFilter extends AbstractFilter {
             for (OutputSlot os : f.getOutputSlots()) {
                 for (FigureConnection c : os.getConnections()) {
                     InputSlot is = c.getInputSlot();
-                    if (f.getSource().getSourceNodes().size() > 0) {
+                    if (f.getInputNode() != null) {
-                        is.getSource().addSourceNodes(f.getSource());
+                        is.getSource().addSourceNode(f.getInputNode());
-                        is.setAssociatedNode(f.getSource().getSourceNodes().get(0));
+                        is.setAssociatedNode(f.getInputNode());
                         is.setColor(f.getColor());
                     }
 

src/utils/IdealGraphVisualizer/Filter/src/main/java/com/sun/hotspot/igv/filter/WarningFilter.java

@@ -24,7 +24,9 @@
 package com.sun.hotspot.igv.filter;
 
 import com.sun.hotspot.igv.data.Properties;
-import com.sun.hotspot.igv.graph.*;
+import com.sun.hotspot.igv.graph.Diagram;
+import com.sun.hotspot.igv.graph.Figure;
+import com.sun.hotspot.igv.graph.Selector;
 import java.util.ArrayList;
 import java.util.List;
 

src/utils/IdealGraphVisualizer/FilterWindow/src/main/java/com/sun/hotspot/igv/filterwindow/FilterNode.java

@@ -60,13 +60,7 @@ public class FilterNode extends CheckNode implements LookupListener, ChangedList
 
         content.add(filter.getEditor());
         this.filter = filter;
-        filter.getChangedEvent().addListener(new ChangedListener<Filter>() {
+        filter.getChangedEvent().addListener(source -> update());
-
-            @Override
-            public void changed(Filter source) {
-                update();
-            }
-        });
 
         update();
 

src/utils/IdealGraphVisualizer/FilterWindow/src/main/java/com/sun/hotspot/igv/filterwindow/FilterTopComponent.java

@@ -184,13 +184,7 @@ public final class FilterTopComponent extends TopComponent implements LookupList
             filterSettings.add(setting);
 
             // Sort alphabetically
-            filterSettings.sort(new Comparator<FilterSetting>() {
+            filterSettings.sort(Comparator.comparing(FilterSetting::getName));
-
-                @Override
-                public int compare(FilterSetting o1, FilterSetting o2) {
-                    return o1.getName().compareTo(o2.getName());
-                }
-            });
 
             updateComboBox();
         }
@@ -268,13 +262,7 @@ public final class FilterTopComponent extends TopComponent implements LookupList
         }
 
         public FilterChildren() {
-            sequence.getChangedEvent().addListener(new ChangedListener<FilterChain>() {
+            sequence.getChangedEvent().addListener(source -> addNotify());
-
-                @Override
-                public void changed(FilterChain source) {
-                    addNotify();
-                }
-            });
 
             setBefore(false);
         }
@@ -706,13 +694,4 @@ public final class FilterTopComponent extends TopComponent implements LookupList
         }
         updateComboBox();
     }
-
-    static final class ResolvableHelper implements Serializable {
-
-        private static final long serialVersionUID = 1L;
-
-        public Object readResolve() {
-            return FilterTopComponent.getDefault();
-        }
-    }
 }

src/utils/IdealGraphVisualizer/FilterWindow/src/main/resources/com/sun/hotspot/igv/filterwindow/layer.xml

@@ -28,6 +28,7 @@
         <folder name="Window">
             <file name="FilterAction.shadow">
                 <attr name="originalFile" stringvalue="Actions/Window/com-sun-hotspot-igv-filterwindow-actions-FilterAction.instance"/>
+                <attr name="position" intvalue="3"/>
             </file>
         </folder>
     </folder>

src/utils/IdealGraphVisualizer/Graph/src/main/java/com/sun/hotspot/igv/graph/AnySelector.java

@@ -23,8 +23,8 @@
  */
 package com.sun.hotspot.igv.graph;
 
-import java.util.List;
 import java.util.ArrayList;
+import java.util.List;
 
 // Selects blocks where any node is selected.
 public class AnySelector implements BlockSelector {
@@ -39,7 +39,7 @@ public class AnySelector implements BlockSelector {
     public List<Block> selected(Diagram d) {
         List<Block> l = new ArrayList<>();
         for (Figure f : selector.selected(d)) {
-            l.add(d.getBlock(f.getBlock()));
+            l.add(f.getBlock());
         }
         return l;
     }

src/utils/IdealGraphVisualizer/Graph/src/main/java/com/sun/hotspot/igv/graph/Block.java

@@ -23,9 +23,9 @@
  */
 package com.sun.hotspot.igv.graph;
 
-import java.awt.Dimension;
 import com.sun.hotspot.igv.data.InputBlock;
 import com.sun.hotspot.igv.layout.Cluster;
+import java.awt.Dimension;
 import java.awt.Rectangle;
 import java.util.HashSet;
 import java.util.Set;
@@ -45,10 +45,6 @@ public class Block implements Cluster {
         this.diagram = diagram;
     }
 
-    public Cluster getOuter() {
-        return null;
-    }
-
     public InputBlock getInputBlock() {
         return inputBlock;
     }

src/utils/IdealGraphVisualizer/Graph/src/main/java/com/sun/hotspot/igv/graph/Diagram.java

@@ -23,15 +23,9 @@
  */
 package com.sun.hotspot.igv.graph;
 
-import com.sun.hotspot.igv.data.InputBlock;
+import com.sun.hotspot.igv.data.*;
-import com.sun.hotspot.igv.data.InputBlockEdge;
-import com.sun.hotspot.igv.data.InputEdge;
-import com.sun.hotspot.igv.data.InputGraph;
-import com.sun.hotspot.igv.data.InputNode;
 import com.sun.hotspot.igv.data.Properties;
-import com.sun.hotspot.igv.data.Properties.StringPropertyMatcher;
 import java.awt.Font;
-import java.awt.Color;
 import java.util.*;
 
 /**
@@ -41,32 +35,19 @@ import java.util.*;
 public class Diagram {
 
     private List<Figure> figures;
-    private Map<InputBlock, Block> blocks;
+    private final Map<InputBlock, Block> blocks;
-    private InputGraph graph;
+    private final String nodeText;
-    private int curId;
+    private final String shortNodeText;
-    private String nodeText;
+    private final String tinyNodeText;
-    private String shortNodeText;
+    public static final Font FONT = new Font("Arial", Font.PLAIN, 12);
-    private String tinyNodeText;
+    public static final Font SLOT_FONT = new Font("Arial", Font.PLAIN, 10);
-    private final Font font;
+    public static final Font BOLD_FONT = FONT.deriveFont(Font.BOLD);
-    private final Font slotFont;
+
-    private final Font boldFont;
     // Whether widgets derived from this diagram should be adapted for the
     // control-flow graph view.
     private boolean cfg;
     private final Set<BlockConnection> blockConnections;
 
-    public Font getFont() {
-        return font;
-    }
-
-    public Font getSlotFont() {
-        return slotFont;
-    }
-
-    public Font getBoldFont() {
-        return boldFont;
-    }
-
     public boolean isCFG() {
         return cfg;
     }
@@ -75,21 +56,68 @@ public class Diagram {
         this.cfg = cfg;
     }
 
-    private Diagram(InputGraph graph, String nodeText, String shortNodeText,
+    public Diagram(InputGraph graph, String nodeText, String shortNodeText,
                    String tinyNodeText) {
-        figures = new ArrayList<>();
+        assert graph != null;
-        blocks = new LinkedHashMap<>(8);
+
-        this.nodeText = "";
-        this.shortNodeText = "";
-        this.font = new Font("Arial", Font.PLAIN, 12);
-        this.slotFont = new Font("Arial", Font.PLAIN, 10);
-        this.boldFont = this.font.deriveFont(Font.BOLD);
-        this.cfg = false;
-        this.blockConnections = new HashSet<>();
-        this.graph = graph;
         this.nodeText = nodeText;
         this.shortNodeText = shortNodeText;
         this.tinyNodeText = tinyNodeText;
+        this.figures = new ArrayList<>();
+        this.blocks = new LinkedHashMap<>(8);
+        this.blockConnections = new HashSet<>();
+        this.cfg = false;
+        int curId = 0;
+
+        for (InputBlock b : graph.getBlocks()) {
+            blocks.put(b, new Block(b, this));
+        }
+
+        Collection<InputNode> nodes = graph.getNodes();
+        Hashtable<Integer, Figure> figureHash = new Hashtable<>();
+        for (InputNode n : nodes) {
+            Figure f = new Figure(this, curId, n);
+            curId++;
+            f.getProperties().add(n.getProperties());
+            f.setBlock(blocks.get(graph.getBlock(n)));
+            figureHash.put(n.getId(), f);
+            this.figures.add(f);
+        }
+
+        for (InputEdge e : graph.getEdges()) {
+            int from = e.getFrom();
+            int to = e.getTo();
+            Figure fromFigure = figureHash.get(from);
+            Figure toFigure = figureHash.get(to);
+
+            if(fromFigure == null || toFigure == null) continue;
+
+            int fromIndex = e.getFromIndex();
+            while (fromFigure.getOutputSlots().size() <= fromIndex) {
+                fromFigure.createOutputSlot();
+            }
+            OutputSlot outputSlot = fromFigure.getOutputSlots().get(fromIndex);
+
+            int toIndex = e.getToIndex();
+            while (toFigure.getInputSlots().size() <= toIndex) {
+                toFigure.createInputSlot();
+            }
+            InputSlot inputSlot = toFigure.getInputSlots().get(toIndex);
+
+            FigureConnection c = createConnection(inputSlot, outputSlot, e.getLabel());
+
+            if (e.getState() == InputEdge.State.NEW) {
+                c.setStyle(Connection.ConnectionStyle.BOLD);
+            } else if (e.getState() == InputEdge.State.DELETED) {
+                c.setStyle(Connection.ConnectionStyle.DASHED);
+            }
+        }
+
+        for (InputBlockEdge e : graph.getBlockEdges()) {
+            Block p = getBlock(e.getFrom());
+            Block s = getBlock(e.getTo());
+            blockConnections.add(new BlockConnection(p, s, e.getLabel()));
+        }
     }
 
     public Block getBlock(InputBlock b) {
@@ -113,27 +141,16 @@ public class Diagram {
         return tinyNodeText;
     }
 
-    public void updateBlocks() {
-        blocks.clear();
-        for (InputBlock b : graph.getBlocks()) {
-            Block curBlock = new Block(b, this);
-            blocks.put(b, curBlock);
-        }
-    }
-
     public Collection<Block> getBlocks() {
         return Collections.unmodifiableCollection(blocks.values());
     }
 
-    public List<Figure> getFigures() {
+    public Collection<InputBlock> getInputBlocks() {
-        return Collections.unmodifiableList(figures);
+        return Collections.unmodifiableCollection(blocks.keySet());
     }
 
-    public Figure createFigure() {
+    public List<Figure> getFigures() {
-        Figure f = new Figure(this, curId);
+        return Collections.unmodifiableList(figures);
-        curId++;
-        this.figures.add(f);
-        return f;
     }
 
     public FigureConnection createConnection(InputSlot inputSlot, OutputSlot outputSlot, String label) {
@@ -142,88 +159,11 @@ public class Diagram {
         return new FigureConnection(inputSlot, outputSlot, label);
     }
 
-    public Map<InputNode, Set<Figure>> calcSourceToFigureRelation() {
-        Map<InputNode, Set<Figure>> map = new HashMap<>();
-
-        for(InputNode node : this.getGraph().getNodes()) {
-            map.put(node, new HashSet<Figure>());
-        }
-
-        for(Figure f : this.getFigures()) {
-            for(InputNode node : f.getSource().getSourceNodes()) {
-                map.get(node).add(f);
-            }
-        }
-
-        return map;
-    }
-
-    public static Diagram createDiagram(InputGraph graph, String nodeText,
-                                        String shortNodeText,
-                                        String tinyNodeText) {
-        if (graph == null) {
-            return null;
-        }
-
-        Diagram d = new Diagram(graph, nodeText, shortNodeText, tinyNodeText);
-        d.updateBlocks();
-
-        Collection<InputNode> nodes = graph.getNodes();
-        Hashtable<Integer, Figure> figureHash = new Hashtable<>();
-        for (InputNode n : nodes) {
-            Figure f = d.createFigure();
-            f.getSource().addSourceNode(n);
-            f.getProperties().add(n.getProperties());
-            f.setSubgraphs(n.getSubgraphs());
-            f.setBlock(graph.getBlock(n));
-            figureHash.put(n.getId(), f);
-        }
-
-        for (InputEdge e : graph.getEdges()) {
-
-            int from = e.getFrom();
-            int to = e.getTo();
-            Figure fromFigure = figureHash.get(from);
-            Figure toFigure = figureHash.get(to);
-
-            if(fromFigure == null || toFigure == null) continue;
-            assert fromFigure != null && toFigure != null;
-
-            int fromIndex = e.getFromIndex();
-            while (fromFigure.getOutputSlots().size() <= fromIndex) {
-                fromFigure.createOutputSlot();
-            }
-            OutputSlot outputSlot = fromFigure.getOutputSlots().get(fromIndex);
-
-            int toIndex = e.getToIndex();
-            while (toFigure.getInputSlots().size() <= toIndex) {
-                toFigure.createInputSlot();
-            }
-            InputSlot inputSlot = toFigure.getInputSlots().get(toIndex);
-
-            FigureConnection c = d.createConnection(inputSlot, outputSlot, e.getLabel());
-
-            if (e.getState() == InputEdge.State.NEW) {
-                c.setStyle(Connection.ConnectionStyle.BOLD);
-            } else if (e.getState() == InputEdge.State.DELETED) {
-                c.setStyle(Connection.ConnectionStyle.DASHED);
-            }
-        }
-
-        for (InputBlockEdge e : graph.getBlockEdges()) {
-            Block p = d.getBlock(e.getFrom());
-            Block s = d.getBlock(e.getTo());
-            d.blockConnections.add(new BlockConnection(p, s, e.getLabel()));
-        }
-
-        return d;
-    }
-
     public void removeAllBlocks(Set<Block> blocksToRemove) {
         Set<Figure> figuresToRemove = new HashSet<>();
         for (Block b : blocksToRemove) {
             for (Figure f : getFigures()) {
-                if (f.getBlock() == b.getInputBlock()) {
+                if (f.getBlock() == b) {
                     figuresToRemove.add(f);
                 }
             }
@@ -273,14 +213,6 @@ public class Diagram {
         this.figures.remove(succ);
     }
 
-    public String getName() {
-        return graph.getName();
-    }
-
-    public InputGraph getGraph() {
-        return graph;
-    }
-
     public Set<FigureConnection> getConnections() {
         Set<FigureConnection> connections = new HashSet<>();
         for (Figure f : figures) {
@@ -302,24 +234,6 @@ public class Diagram {
         return connections;
     }
 
-    public Figure getRootFigure() {
-        Properties.PropertySelector<Figure> selector = new Properties.PropertySelector<>(figures);
-        Figure root = selector.selectSingle(new StringPropertyMatcher("name", "Root"));
-        if (root == null) {
-            root = selector.selectSingle(new StringPropertyMatcher("name", "Start"));
-        }
-        if (root == null) {
-            List<Figure> rootFigures = getRootFigures();
-            if (rootFigures.size() > 0) {
-                root = rootFigures.get(0);
-            } else if (figures.size() > 0) {
-                root = figures.get(0);
-            }
-        }
-
-        return root;
-    }
-
     public void printStatistics() {
         System.out.println("=============================================================");
         System.out.println("Diagram statistics");
@@ -354,14 +268,4 @@ public class Diagram {
 
         System.out.println("=============================================================");
     }
-
-    public List<Figure> getRootFigures() {
-        ArrayList<Figure> rootFigures = new ArrayList<>();
-        for (Figure f : figures) {
-            if (f.getPredecessors().size() == 0) {
-                rootFigures.add(f);
-            }
-        }
-        return rootFigures;
-    }
 }

src/utils/IdealGraphVisualizer/Graph/src/main/java/com/sun/hotspot/igv/graph/Figure.java

@@ -23,18 +23,15 @@
  */
 package com.sun.hotspot.igv.graph;
 
-import com.sun.hotspot.igv.data.InputBlock;
-import com.sun.hotspot.igv.data.InputGraph;
 import com.sun.hotspot.igv.data.InputNode;
 import com.sun.hotspot.igv.data.Properties;
-import com.sun.hotspot.igv.data.Source;
 import com.sun.hotspot.igv.layout.Cluster;
 import com.sun.hotspot.igv.layout.Vertex;
 import java.awt.*;
 import java.util.List;
 import java.util.*;
 
-public class Figure extends Properties.Entity implements Source.Provider, Vertex {
+public class Figure extends Properties.Entity implements Vertex {
 
     public static final int INSET = 8;
     public static final int SLOT_WIDTH = 10;
@@ -46,20 +43,19 @@ public class Figure extends Properties.Entity implements Source.Provider, Vertex
     public static final int WARNING_WIDTH = 16;
     protected List<InputSlot> inputSlots;
     protected List<OutputSlot> outputSlots;
-    private Source source;
+    private final InputNode inputNode;
-    private Diagram diagram;
+    private final Diagram diagram;
     private Point position;
-    private List<Figure> predecessors;
+    private final List<Figure> predecessors;
-    private List<Figure> successors;
+    private final List<Figure> successors;
-    private List<InputGraph> subgraphs;
     private Color color;
     private String warning;
-    private int id;
+    private final int id;
-    private String idString;
+    private final String idString;
     private String[] lines;
     private int heightCash = -1;
     private int widthCash = -1;
-    private InputBlock block;
+    private Block block;
     private final FontMetrics metrics;
 
     public int getHeight() {
@@ -132,20 +128,19 @@ public class Figure extends Properties.Entity implements Source.Provider, Vertex
             widthCash = Math.max(widthCash, Figure.getSlotsWidth(outputSlots));
     }
 
-    protected Figure(Diagram diagram, int id) {
+    protected Figure(Diagram diagram, int id, InputNode node) {
         this.diagram = diagram;
-        this.source = new Source();
+        this.inputNode = node;
-        inputSlots = new ArrayList<>(5);
+        this.inputSlots = new ArrayList<>(5);
-        outputSlots = new ArrayList<>(1);
+        this.outputSlots = new ArrayList<>(1);
-        predecessors = new ArrayList<>(6);
+        this.predecessors = new ArrayList<>(6);
-        successors = new ArrayList<>(6);
+        this.successors = new ArrayList<>(6);
         this.id = id;
-        idString = Integer.toString(id);
+        this.idString = Integer.toString(id);
-
         this.position = new Point(0, 0);
         this.color = Color.WHITE;
         Canvas canvas = new Canvas();
-        metrics = canvas.getFontMetrics(diagram.getFont().deriveFont(Font.BOLD));
+        this.metrics = canvas.getFontMetrics(Diagram.FONT.deriveFont(Font.BOLD));
     }
 
     public int getId() {
@@ -172,11 +167,11 @@ public class Figure extends Properties.Entity implements Source.Provider, Vertex
         return diagram.isCFG() && !getPredecessors().isEmpty();
     }
 
-    public void setBlock(InputBlock block) {
+    public void setBlock(Block block) {
         this.block = block;
     }
 
-    public InputBlock getBlock() {
+    public Block getBlock() {
         return block;
     }
 
@@ -185,19 +180,11 @@ public class Figure extends Properties.Entity implements Source.Provider, Vertex
     }
 
     public Set<Figure> getPredecessorSet() {
-        Set<Figure> result = new HashSet<>();
+        return Collections.unmodifiableSet(new HashSet<>(getPredecessors()));
-        for (Figure f : getPredecessors()) {
-            result.add(f);
-        }
-        return Collections.unmodifiableSet(result);
     }
 
     public Set<Figure> getSuccessorSet() {
-        Set<Figure> result = new HashSet<>();
+        return Collections.unmodifiableSet(new HashSet<>(getSuccessors()));
-        for (Figure f : getSuccessors()) {
-            result.add(f);
-        }
-        return Collections.unmodifiableSet(result);
     }
 
     public List<Figure> getSuccessors() {
@@ -222,14 +209,6 @@ public class Figure extends Properties.Entity implements Source.Provider, Vertex
         successors.remove(f);
     }
 
-    public List<InputGraph> getSubgraphs() {
-        return subgraphs;
-    }
-
-    public void setSubgraphs(List<InputGraph> subgraphs) {
-        this.subgraphs = subgraphs;
-    }
-
     @Override
     public void setPosition(Point p) {
         this.position = p;
@@ -244,9 +223,8 @@ public class Figure extends Properties.Entity implements Source.Provider, Vertex
         return diagram;
     }
 
-    @Override
+    public InputNode getInputNode() {
-    public Source getSource() {
+        return inputNode;
-        return source;
     }
 
     public InputSlot createInputSlot() {
@@ -255,13 +233,6 @@ public class Figure extends Properties.Entity implements Source.Provider, Vertex
         return slot;
     }
 
-    public InputSlot createInputSlot(int index) {
-        InputSlot slot = new InputSlot(this, index);
-        inputSlots.add(slot);
-        inputSlots.sort(Slot.slotIndexComparator);
-        return slot;
-    }
-
     public void removeSlot(Slot s) {
 
         assert inputSlots.contains(s) || outputSlots.contains(s);
@@ -273,15 +244,12 @@ public class Figure extends Properties.Entity implements Source.Provider, Vertex
 
         if (inputSlots.contains(s)) {
             inputSlots.remove(s);
-        } else if (outputSlots.contains(s)) {
+        } else outputSlots.remove(s);
-            outputSlots.remove(s);
-        }
     }
 
-    public OutputSlot createOutputSlot() {
+    public void createOutputSlot() {
         OutputSlot slot = new OutputSlot(this, -1);
         outputSlots.add(slot);
-        return slot;
     }
 
     public OutputSlot createOutputSlot(int index) {
@@ -345,13 +313,13 @@ public class Figure extends Properties.Entity implements Source.Provider, Vertex
         String[] strings = diagram.getNodeText().split("\n");
         List<String> result = new ArrayList<>(strings.length + 1);
 
-        for (int i = 0; i < strings.length; i++) {
+        for (String string : strings) {
-            result.add(getProperties().resolveString(strings[i]));
+            result.add(getProperties().resolveString(string));
         }
 
         if (hasInputList()) {
             String inputList = " ← ";
-            List<String> inputs = new ArrayList<String>(getPredecessors().size());
+            List<String> inputs = new ArrayList<>(getPredecessors().size());
             for (Figure p : getPredecessors()) {
                 inputs.add(p.getProperties().resolveString(diagram.getTinyNodeText()));
             }
@@ -366,13 +334,12 @@ public class Figure extends Properties.Entity implements Source.Provider, Vertex
         }
 
         lines = result.toArray(new String[0]);
-        // Set the "label" property of each input node, so that by default
+        // Set the "label" property of the input node, so that by default
         // search is done on the node label (without line breaks). See also
         // class NodeQuickSearch in the View module.
-        for (InputNode n : getSource().getSourceNodes()) {
+        String label = inputNode.getProperties().resolveString(diagram.getNodeText());
-            String label = n.getProperties().resolveString(diagram.getNodeText());
+        inputNode.getProperties().setProperty("label", label.replaceAll("\\R", " "));
-            n.getProperties().setProperty("label", label.replaceAll("\\R", " "));
+
-        }
         // Update figure dimensions, as these are affected by the node text.
         updateWidth();
         updateHeight();
@@ -390,33 +357,18 @@ public class Figure extends Properties.Entity implements Source.Provider, Vertex
         return idString;
     }
 
-    public InputNode getFirstSourceNode() {
-        return getSource().getSourceNodes().get(0);
-    }
-
     public static int getVerticalOffset() {
         return Figure.SLOT_WIDTH - Figure.OVERLAPPING;
     }
 
     public Cluster getCluster() {
-        if (getSource().getSourceNodes().size() == 0) {
+        return block;
-            assert false : "Should never reach here, every figure must have at least one source node!";
-            return null;
-        } else {
-            final InputBlock inputBlock = diagram.getGraph().getBlock(getFirstSourceNode());
-            assert inputBlock != null;
-            Cluster result = diagram.getBlock(inputBlock);
-            assert result != null;
-            return result;
-        }
     }
 
     @Override
     public boolean isRoot() {
-
+        if (inputNode != null && inputNode.getProperties().get("name") != null) {
-        List<InputNode> sourceNodes = source.getSourceNodes();
+            return inputNode.getProperties().get("name").equals("Root");
-        if (sourceNodes.size() > 0 && getFirstSourceNode().getProperties().get("name") != null) {
-            return getFirstSourceNode().getProperties().get("name").equals("Root");
         } else {
             return false;
         }
@@ -426,8 +378,4 @@ public class Figure extends Properties.Entity implements Source.Provider, Vertex
     public int compareTo(Vertex f) {
         return toString().compareTo(f.toString());
     }
-
-    public Rectangle getBounds() {
-        return new Rectangle(this.getPosition(), new Dimension(this.getWidth(), this.getHeight()));
-    }
 }

src/utils/IdealGraphVisualizer/Graph/src/main/java/com/sun/hotspot/igv/graph/FigureConnection.java

@@ -23,8 +23,8 @@
  */
 package com.sun.hotspot.igv.graph;
 
-import com.sun.hotspot.igv.layout.Port;
 import com.sun.hotspot.igv.layout.Cluster;
+import com.sun.hotspot.igv.layout.Port;
 import java.awt.Color;
 import java.awt.Point;
 import java.util.ArrayList;

src/utils/IdealGraphVisualizer/Graph/src/main/java/com/sun/hotspot/igv/graph/Slot.java

@@ -78,24 +78,7 @@ public abstract class Slot implements Port, Source.Provider, Properties.Provider
         }
         return p;
     }
-    public static final Comparator<Slot> slotIndexComparator = new Comparator<Slot>() {
+    public static final Comparator<Slot> slotIndexComparator = Comparator.comparingInt(o -> o.wantedIndex);
-
-        @Override
-        public int compare(Slot o1, Slot o2) {
-            return o1.wantedIndex - o2.wantedIndex;
-        }
-    };
-    public static final Comparator<Slot> slotFigureComparator = new Comparator<Slot>() {
-
-        @Override
-        public int compare(Slot o1, Slot o2) {
-            return o1.figure.getId() - o2.figure.getId();
-        }
-    };
-
-    public InputNode getAssociatedNode() {
-        return associatedNode;
-    }
 
     public void setAssociatedNode(InputNode node) {
         associatedNode = node;
@@ -107,7 +90,7 @@ public abstract class Slot implements Port, Source.Provider, Properties.Provider
         } else {
             BufferedImage image = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB);
             Graphics g = image.getGraphics();
-            g.setFont(figure.getDiagram().getSlotFont().deriveFont(Font.BOLD));
+            g.setFont(Diagram.SLOT_FONT.deriveFont(Font.BOLD));
             FontMetrics metrics = g.getFontMetrics();
             return Math.max(Figure.SLOT_WIDTH, metrics.stringWidth(shortName) + 6);
         }

src/utils/IdealGraphVisualizer/HierarchicalLayout/src/main/java/com/sun/hotspot/igv/hierarchicallayout/ClusterEdge.java

@@ -23,9 +23,9 @@
  */
 package com.sun.hotspot.igv.hierarchicallayout;
 
+import com.sun.hotspot.igv.layout.Cluster;
 import com.sun.hotspot.igv.layout.Link;
 import com.sun.hotspot.igv.layout.Port;
-import com.sun.hotspot.igv.layout.Cluster;
 import java.awt.Point;
 import java.util.List;
 
@@ -35,8 +35,8 @@ import java.util.List;
  */
 public class ClusterEdge implements Link {
 
-    private ClusterNode from;
+    private final ClusterNode from;
-    private ClusterNode to;
+    private final ClusterNode to;
     private List<Point> points;
 
     public ClusterEdge(ClusterNode from, ClusterNode to) {

src/utils/IdealGraphVisualizer/HierarchicalLayout/src/main/java/com/sun/hotspot/igv/hierarchicallayout/ClusterIngoingConnection.java

@@ -23,9 +23,9 @@
  */
 package com.sun.hotspot.igv.hierarchicallayout;
 
+import com.sun.hotspot.igv.layout.Cluster;
 import com.sun.hotspot.igv.layout.Link;
 import com.sun.hotspot.igv.layout.Port;
-import com.sun.hotspot.igv.layout.Cluster;
 import java.awt.Point;
 import java.util.ArrayList;
 import java.util.List;
@@ -37,28 +37,16 @@ import java.util.List;
 public class ClusterIngoingConnection implements Link {
 
     private List<Point> controlPoints;
-    private ClusterInputSlotNode inputSlotNode;
+    private final Port inputSlot;
-    private Link connection;
+    private final Port outputSlot;
-    private Port inputSlot;
-    private Port outputSlot;
 
     public ClusterIngoingConnection(ClusterInputSlotNode inputSlotNode, Link c) {
-        this.inputSlotNode = inputSlotNode;
+        this.controlPoints = new ArrayList<>();
-        this.connection = c;
-        this.controlPoints = new ArrayList<Point>();
 
         inputSlot = c.getTo();
         outputSlot = inputSlotNode.getOutputSlot();
     }
 
-    public Link getConnection() {
-        return connection;
-    }
-
-    public ClusterInputSlotNode getInputSlotNode() {
-        return inputSlotNode;
-    }
-
     public Port getTo() {
         return inputSlot;
     }

src/utils/IdealGraphVisualizer/HierarchicalLayout/src/main/java/com/sun/hotspot/igv/hierarchicallayout/ClusterInputSlotNode.java

@@ -35,23 +35,12 @@ import java.awt.Point;
  */
 public class ClusterInputSlotNode implements Vertex {
 
-    private final int SIZE = 0;
     private Point position;
-    private Port inputSlot;
+    private final Port inputSlot;
-    private Port outputSlot;
+    private final Port outputSlot;
-    private ClusterNode blockNode;
+    private final ClusterNode blockNode;
-    private InterClusterConnection interBlockConnection;
-    private Cluster cluster;
-    private ClusterIngoingConnection conn;
 
-    public void setIngoingConnection(ClusterIngoingConnection c) {
+    private final String id;
-        conn = c;
-    }
-
-    public ClusterIngoingConnection getIngoingConnection() {
-        return conn;
-    }
-    private String id;
 
     @Override
     public String toString() {
@@ -79,7 +68,7 @@ public class ClusterInputSlotNode implements Vertex {
 
             @Override
             public String toString() {
-                return "OutPort of " + thisNode.toString();
+                return "OutPort of " + thisNode;
             }
         };
 
@@ -98,7 +87,7 @@ public class ClusterInputSlotNode implements Vertex {
 
             @Override
             public String toString() {
-                return "InPort of " + thisNode.toString();
+                return "InPort of " + thisNode;
             }
         };
     }
@@ -107,16 +96,12 @@ public class ClusterInputSlotNode implements Vertex {
         return inputSlot;
     }
 
-    public InterClusterConnection getInterBlockConnection() {
-        return interBlockConnection;
-    }
-
     public Port getOutputSlot() {
         return outputSlot;
     }
 
     public Dimension getSize() {
-        return new Dimension(SIZE, SIZE);
+        return new Dimension(0, 0);
     }
 
     public void setPosition(Point p) {
@@ -127,12 +112,8 @@ public class ClusterInputSlotNode implements Vertex {
         return position;
     }
 
-    public void setInterBlockConnection(InterClusterConnection interBlockConnection) {
-        this.interBlockConnection = interBlockConnection;
-    }
-
     public Cluster getCluster() {
-        return cluster;
+        return null;
     }
 
     public boolean isRoot() {

src/utils/IdealGraphVisualizer/HierarchicalLayout/src/main/java/com/sun/hotspot/igv/hierarchicallayout/ClusterNode.java

@@ -29,11 +29,7 @@ import com.sun.hotspot.igv.layout.Port;
 import com.sun.hotspot.igv.layout.Vertex;
 import java.awt.Dimension;
 import java.awt.Point;
-import java.util.ArrayList;
+import java.util.*;
-import java.util.Collections;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Set;
 
 /**
  *
@@ -43,14 +39,12 @@ public class ClusterNode implements Vertex {
 
     private Cluster cluster;
     private Port inputSlot;
-    private Port outputSlot;
+    private final Set<Vertex> subNodes;
-    private Set<Vertex> subNodes;
     private Dimension size;
     private Point position;
-    private Set<Link> subEdges;
+    private final Set<Link> subEdges;
-    private boolean dirty;
     private boolean root;
-    private String name;
+    private final String name;
     private final int border;
     private final Dimension nodeOffset;
     private final int headerVerticalSpace;
@@ -59,10 +53,10 @@ public class ClusterNode implements Vertex {
     public ClusterNode(Cluster cluster, String name, int border,
                        Dimension nodeOffset, int headerVerticalSpace,
                        Dimension emptySize) {
-        this.subNodes = new HashSet<Vertex>();
+        this.subNodes = new HashSet<>();
-        this.subEdges = new HashSet<Link>();
+        this.subEdges = new HashSet<>();
         this.cluster = cluster;
-        position = new Point(0, 0);
+        this.position = new Point(0, 0);
         this.name = name;
         this.border = border;
         this.nodeOffset = nodeOffset;
@@ -94,8 +88,6 @@ public class ClusterNode implements Vertex {
     }
 
     public void updateSize() {
-
-
         calculateSize();
 
         final ClusterNode widget = this;
@@ -114,22 +106,6 @@ public class ClusterNode implements Vertex {
                 return "ClusterInput(" + name + ")";
             }
         };
-
-        outputSlot = new Port() {
-
-            public Point getRelativePosition() {
-                return new Point(size.width / 2, 0);//size.height);
-            }
-
-            public Vertex getVertex() {
-                return widget;
-            }
-
-            @Override
-            public String toString() {
-                return "ClusterOutput(" + name + ")";
-            }
-        };
     }
 
     private void calculateSize() {
@@ -174,7 +150,7 @@ public class ClusterNode implements Vertex {
         }
 
         for (Link l : subEdges) {
-            List<Point> points = new ArrayList<Point>(l.getControlPoints());
+            List<Point> points = new ArrayList<>(l.getControlPoints());
             for (Point p : points) {
                 p.x -= minX;
                 p.y -= minY;
@@ -192,10 +168,6 @@ public class ClusterNode implements Vertex {
 
     }
 
-    public Port getOutputSlot() {
-        return outputSlot;
-    }
-
     public Dimension getSize() {
         return size;
     }
@@ -215,7 +187,7 @@ public class ClusterNode implements Vertex {
 
         for (Link e : subEdges) {
             List<Point> arr = e.getControlPoints();
-            ArrayList<Point> newArr = new ArrayList<Point>(arr.size());
+            ArrayList<Point> newArr = new ArrayList<>(arr.size());
             for (Point p : arr) {
                 if (p != null) {
                     Point p2 = new Point(p);
@@ -238,10 +210,6 @@ public class ClusterNode implements Vertex {
         cluster = c;
     }
 
-    public void setDirty(boolean b) {
-        dirty = b;
-    }
-
     public void setRoot(boolean b) {
         root = b;
     }

src/utils/IdealGraphVisualizer/HierarchicalLayout/src/main/java/com/sun/hotspot/igv/hierarchicallayout/ClusterOutgoingConnection.java

@@ -23,9 +23,9 @@
  */
 package com.sun.hotspot.igv.hierarchicallayout;
 
+import com.sun.hotspot.igv.layout.Cluster;
 import com.sun.hotspot.igv.layout.Link;
 import com.sun.hotspot.igv.layout.Port;
-import com.sun.hotspot.igv.layout.Cluster;
 import java.awt.Point;
 import java.util.ArrayList;
 import java.util.List;
@@ -37,18 +37,13 @@ import java.util.List;
 public class ClusterOutgoingConnection implements Link {
 
     private List<Point> intermediatePoints;
-    private ClusterOutputSlotNode outputSlotNode;
+    private final Port inputSlot;
-    private Link connection;
+    private final Port outputSlot;
-    private Port inputSlot;
-    private Port outputSlot;
 
     public ClusterOutgoingConnection(ClusterOutputSlotNode outputSlotNode, Link c) {
-        this.outputSlotNode = outputSlotNode;
+        this.intermediatePoints = new ArrayList<>();
-        this.connection = c;
+        this.outputSlot = c.getFrom();
-        this.intermediatePoints = new ArrayList<Point>();
+        this.inputSlot = outputSlotNode.getInputSlot();
-
-        outputSlot = c.getFrom();
-        inputSlot = outputSlotNode.getInputSlot();
     }
 
     public Port getTo() {

src/utils/IdealGraphVisualizer/HierarchicalLayout/src/main/java/com/sun/hotspot/igv/hierarchicallayout/ClusterOutputSlotNode.java

@@ -35,15 +35,13 @@ import java.awt.Point;
  */
 public class ClusterOutputSlotNode implements Vertex {
 
-    private final int SIZE = 0;
     private Point position;
-    private Port inputSlot;
+    private final Port inputSlot;
-    private Port outputSlot;
+    private final Port outputSlot;
-    private ClusterNode blockNode;
+    private final ClusterNode blockNode;
-    private boolean root;
     private Cluster cluster;
     private ClusterOutgoingConnection conn;
-    private String id;
+    private final String id;
 
     public void setOutgoingConnection(ClusterOutgoingConnection c) {
         this.conn = c;
@@ -79,7 +77,7 @@ public class ClusterOutputSlotNode implements Vertex {
 
             @Override
             public String toString() {
-                return "InPort of " + thisNode.toString();
+                return "InPort of " + thisNode;
             }
         };
 
@@ -88,7 +86,7 @@ public class ClusterOutputSlotNode implements Vertex {
             public Point getRelativePosition() {
                 Point p = new Point(thisNode.getPosition());
                 p.x += blockNode.getBorder();
-                p.y = 0;//thisBlockNode.getSize().height;
+                p.y = 0;
                 return p;
             }
 
@@ -98,13 +96,13 @@ public class ClusterOutputSlotNode implements Vertex {
 
             @Override
             public String toString() {
-                return "OutPort of " + thisNode.toString();
+                return "OutPort of " + thisNode;
             }
         };
     }
 
     public Dimension getSize() {
-        return new Dimension(SIZE, SIZE);
+        return new Dimension(0, 0);
     }
 
     public void setPosition(Point p) {
@@ -127,16 +125,12 @@ public class ClusterOutputSlotNode implements Vertex {
         cluster = c;
     }
 
-    public void setRoot(boolean b) {
-        root = b;
-    }
-
     public Cluster getCluster() {
         return cluster;
     }
 
     public boolean isRoot() {
-        return root;
+        return false;
     }
 
     public int compareTo(Vertex o) {

src/utils/IdealGraphVisualizer/HierarchicalLayout/src/main/java/com/sun/hotspot/igv/hierarchicallayout/Edge.java

@@ -1,90 +0,0 @@
-/*
- * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- *
- */
-package com.sun.hotspot.igv.hierarchicallayout;
-
-/**
- *
- * @author Thomas Wuerthinger
- */
-public class Edge<N, E> {
-
-    private E data;
-    private Node<N, E> source;
-    private Node<N, E> dest;
-
-    protected Edge(Graph<N, E> graph, Node<N, E> source, Node<N, E> dest, E data) {
-        setData(data);
-        this.source = source;
-        this.dest = dest;
-        assert source != null;
-        assert dest != null;
-        assert source.getGraph() == dest.getGraph();
-        assert source.getGraph() != null;
-        assert dest.getGraph() != null;
-    }
-
-    public Node<N, E> getSource() {
-        return source;
-    }
-
-    public Node<N, E> getDest() {
-        return dest;
-    }
-
-    public E getData() {
-        return data;
-    }
-
-    public void setData(E e) {
-        data = e;
-    }
-
-    public void remove() {
-        source.getGraph().removeEdge(this, null);
-    }
-
-    public boolean isSelfLoop() {
-        return source == dest;
-    }
-
-    public void reverse() {
-
-        // Remove from current source / dest
-        source.removeOutEdge(this);
-        dest.removeInEdge(this);
-
-        Node<N, E> tmp = source;
-        source = dest;
-        dest = tmp;
-
-        // Add to new source / dest
-        source.addOutEdge(this);
-        dest.addInEdge(this);
-    }
-
-    @Override
-    public String toString() {
-        return "Edge (" + source + " -- " + dest + "): " + data;
-    }
-}

src/utils/IdealGraphVisualizer/HierarchicalLayout/src/main/java/com/sun/hotspot/igv/hierarchicallayout/Graph.java

@@ -1,292 +0,0 @@
-/*
- * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- *
- */
-package com.sun.hotspot.igv.hierarchicallayout;
-
-import java.util.*;
-
-/**
- *
- * @author Thomas Wuerthinger
- */
-public class Graph<N, E> {
-
-    private HashMap<Object, Node<N, E>> nodes;
-    private HashMap<Object, Edge<N, E>> edges;
-    private List<Node<N, E>> nodeList;
-
-    public Graph() {
-        nodes = new HashMap<>();
-        edges = new HashMap<>();
-        nodeList = new ArrayList<>();
-    }
-
-    public Node<N, E> createNode(N data, Object key) {
-        Node<N, E> n = new Node<>(this, data);
-        assert key == null || !nodes.containsKey(key);
-        if (key != null) {
-            nodes.put(key, n);
-        }
-        nodeList.add(n);
-        return n;
-    }
-
-    public Edge<N, E> createEdge(Node<N, E> source, Node<N, E> dest, E data, Object key) {
-        Edge<N, E> e = new Edge<>(this, source, dest, data);
-        source.addOutEdge(e);
-        dest.addInEdge(e);
-        if (key != null) {
-            edges.put(key, e);
-        }
-        return e;
-    }
-
-    public Node<N, E> getNode(Object key) {
-        return nodes.get(key);
-    }
-
-    public Edge<N, E> getEdge(Object key) {
-        return edges.get(key);
-    }
-
-    public Collection<Edge<N, E>> getEdges() {
-        return Collections.unmodifiableCollection(edges.values());
-    }
-
-    public Collection<Node<N, E>> getNodes() {
-        return Collections.unmodifiableList(nodeList);
-    }
-
-    public void removeEdge(Edge<N, E> e, Object key) {
-        assert key == null || edges.containsKey(key);
-        if (key != null) {
-            edges.remove(key);
-        }
-        e.getSource().removeOutEdge(e);
-        e.getDest().removeInEdge(e);
-    }
-
-    public class DFSTraversalVisitor {
-
-        public void visitNode(Node<N, E> n) {
-        }
-
-        public boolean visitEdge(Edge<N, E> e, boolean backEdge) {
-            return true;
-        }
-    }
-
-    public class BFSTraversalVisitor {
-
-        public void visitNode(Node<N, E> n, int depth) {
-        }
-    }
-
-    public List<Node<N, E>> getNodesWithInDegree(int x) {
-        return getNodesWithInDegree(x, true);
-    }
-
-    public List<Node<N, E>> getNodesWithInDegree(int x, boolean countSelfLoops) {
-
-        List<Node<N, E>> result = new ArrayList<>();
-        for (Node<N, E> n : getNodes()) {
-            if (n.getInDegree(countSelfLoops) == x) {
-                result.add(n);
-            }
-        }
-
-        return result;
-
-    }
-
-    private void markReachable(Node<N, E> startingNode) {
-        ArrayList<Node<N, E>> arr = new ArrayList<>();
-        arr.add(startingNode);
-        for (Node<N, E> n : getNodes()) {
-            n.setReachable(false);
-        }
-        traverseDFS(arr, new DFSTraversalVisitor() {
-
-            @Override
-            public void visitNode(Node<N, E> n) {
-                n.setReachable(true);
-            }
-        });
-    }
-
-    public void traverseBFS(Node<N, E> startingNode, BFSTraversalVisitor tv, boolean longestPath) {
-
-        if (longestPath) {
-            markReachable(startingNode);
-        }
-
-        for (Node<N, E> n : getNodes()) {
-            n.setVisited(false);
-            n.setActive(false);
-        }
-
-        Queue<Node<N, E>> queue = new LinkedList<>();
-        queue.add(startingNode);
-        startingNode.setVisited(true);
-        int layer = 0;
-        Node<N, E> lastOfLayer = startingNode;
-        Node<N, E> lastAdded = null;
-
-        while (!queue.isEmpty()) {
-
-            Node<N, E> current = queue.poll();
-            tv.visitNode(current, layer);
-            current.setActive(false);
-
-
-            for (Edge<N, E> e : current.getOutEdges()) {
-                if (!e.getDest().isVisited()) {
-
-                    boolean allow = true;
-                    if (longestPath) {
-                        for (Node<N, E> pred : e.getDest().getPredecessors()) {
-                            if ((!pred.isVisited() || pred.isActive()) && pred.isReachable()) {
-                                allow = false;
-                                break;
-                            }
-                        }
-                    }
-
-                    if (allow) {
-                        queue.offer(e.getDest());
-                        lastAdded = e.getDest();
-                        e.getDest().setVisited(true);
-                        e.getDest().setActive(true);
-                    }
-                }
-            }
-
-            if (current == lastOfLayer && !queue.isEmpty()) {
-                lastOfLayer = lastAdded;
-                layer++;
-            }
-        }
-    }
-
-    public void traverseDFS(DFSTraversalVisitor tv) {
-        traverseDFS(getNodes(), tv);
-    }
-
-    public void traverseDFS(Collection<Node<N, E>> startingNodes, DFSTraversalVisitor tv) {
-
-        for (Node<N, E> n : getNodes()) {
-            n.setVisited(false);
-            n.setActive(false);
-        }
-
-        boolean result = false;
-        for (Node<N, E> n : startingNodes) {
-            traverse(tv, n);
-        }
-    }
-
-    private void traverse(DFSTraversalVisitor tv, Node<N, E> n) {
-
-        if (!n.isVisited()) {
-            n.setVisited(true);
-            n.setActive(true);
-            tv.visitNode(n);
-
-            for (Edge<N, E> e : n.getOutEdges()) {
-
-                Node<N, E> next = e.getDest();
-                if (next.isActive()) {
-                    tv.visitEdge(e, true);
-                } else {
-                    if (tv.visitEdge(e, false)) {
-                        traverse(tv, next);
-                    }
-                }
-            }
-
-            n.setActive(false);
-        }
-
-    }
-
-    public boolean hasCycles() {
-
-        for (Node<N, E> n : getNodes()) {
-            n.setVisited(false);
-            n.setActive(false);
-        }
-
-        boolean result = false;
-        for (Node<N, E> n : getNodes()) {
-            result |= checkCycles(n);
-            if (result) {
-                break;
-            }
-        }
-        return result;
-    }
-
-    private boolean checkCycles(Node<N, E> n) {
-
-        if (n.isActive()) {
-            return true;
-        }
-
-        if (!n.isVisited()) {
-
-            n.setVisited(true);
-            n.setActive(true);
-
-            for (Node<N, E> succ : n.getSuccessors()) {
-                if (checkCycles(succ)) {
-                    return true;
-                }
-            }
-
-            n.setActive(false);
-
-        }
-
-        return false;
-    }
-
-    @Override
-    public String toString() {
-
-        StringBuilder s = new StringBuilder();
-        s.append("Nodes: ");
-        for (Node<N, E> n : getNodes()) {
-            s.append(n.toString());
-            s.append("\n");
-        }
-
-        s.append("Edges: ");
-
-        for (Edge<N, E> e : getEdges()) {
-            s.append(e.toString());
-            s.append("\n");
-        }
-
-        return s.toString();
-    }
-}

src/utils/IdealGraphVisualizer/HierarchicalLayout/src/main/java/com/sun/hotspot/igv/hierarchicallayout/HierarchicalCFGLayoutManager.java

@@ -23,22 +23,15 @@
  */
 package com.sun.hotspot.igv.hierarchicallayout;
 
-import java.awt.Dimension;
-import java.awt.Rectangle;
-import java.awt.Canvas;
-import java.awt.Font;
-import java.awt.FontMetrics;
-import java.util.*;
-import com.sun.hotspot.igv.layout.Cluster;
-import com.sun.hotspot.igv.layout.LayoutGraph;
 import com.sun.hotspot.igv.layout.LayoutManager;
-import com.sun.hotspot.igv.layout.Link;
+import com.sun.hotspot.igv.layout.*;
-import com.sun.hotspot.igv.layout.Vertex;
+import java.awt.*;
+import java.util.*;
 
 public class HierarchicalCFGLayoutManager implements LayoutManager {
 
     private static final int BLOCK_BORDER = 5;
-    private FontMetrics fontMetrics;
+    private final FontMetrics fontMetrics;
     // Lays out nodes within a single cluster (basic block).
     private LayoutManager subManager;
     // Lays out clusters in the CFG.
@@ -78,13 +71,12 @@ public class HierarchicalCFGLayoutManager implements LayoutManager {
         // Compute layout for each cluster.
         for (Cluster c : clusters) {
             ClusterNode n = clusterNode.get(c);
-            subManager.doLayout(new LayoutGraph(n.getSubEdges(), n.getSubNodes()), new HashSet<Link>());
+            subManager.doLayout(new LayoutGraph(n.getSubEdges(), n.getSubNodes()), new HashSet<>());
             n.updateSize();
         }
 
         // Compute inter-cluster layout.
-        manager.doLayout(new LayoutGraph(clusterEdges, new HashSet<>(clusterNode.values())),
+        manager.doLayout(new LayoutGraph(clusterEdges, new HashSet<>(clusterNode.values())), new HashSet<>());
-                         new HashSet<Link>());
 
         // Write back results.
         writeBackClusterBounds(clusterNode);
@@ -144,11 +136,11 @@ public class HierarchicalCFGLayoutManager implements LayoutManager {
         // Map from "primitive" cluster edges to their input links.
         Map<AbstractMap.SimpleEntry<Cluster, Cluster>, Link> inputLink = new HashMap<>();
         for (Link l : graph.getLinks()) {
-            inputLink.put(new AbstractMap.SimpleEntry<Cluster, Cluster>(l.getFromCluster(), l.getToCluster()), l);
+            inputLink.put(new AbstractMap.SimpleEntry<>(l.getFromCluster(), l.getToCluster()), l);
         }
         for (ClusterEdge ce : clusterEdges) {
             assert (ce.getControlPoints() != null);
-            Link l = inputLink.get(new AbstractMap.SimpleEntry<Cluster, Cluster>(ce.getFromCluster(), ce.getToCluster()));
+            Link l = inputLink.get(new AbstractMap.SimpleEntry<>(ce.getFromCluster(), ce.getToCluster()));
             l.setControlPoints(ce.getControlPoints());
         }
     }

src/utils/IdealGraphVisualizer/HierarchicalLayout/src/main/java/com/sun/hotspot/igv/hierarchicallayout/HierarchicalClusterLayoutManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -23,20 +23,10 @@
  */
 package com.sun.hotspot.igv.hierarchicallayout;
 
+import com.sun.hotspot.igv.layout.*;
 import java.awt.Point;
 import java.awt.Rectangle;
-import java.util.HashMap;
+import java.util.*;
-import java.util.List;
-import java.util.Set;
-import java.util.ArrayList;
-import java.util.HashSet;
-import java.util.TreeSet;
-import com.sun.hotspot.igv.layout.Cluster;
-import com.sun.hotspot.igv.layout.LayoutGraph;
-import com.sun.hotspot.igv.layout.LayoutManager;
-import com.sun.hotspot.igv.layout.Link;
-import com.sun.hotspot.igv.layout.Port;
-import com.sun.hotspot.igv.layout.Vertex;
 
 /**
  *
@@ -53,10 +43,6 @@ public class HierarchicalClusterLayoutManager implements LayoutManager {
         this.combine = combine;
     }
 
-    public void doLayout(LayoutGraph graph) {
-        doLayout(graph, new HashSet<Vertex>(), new HashSet<Vertex>(), new HashSet<Link>());
-    }
-
     public void doLayout(LayoutGraph graph, Set<? extends Link> importantLinks) {
         doLayout(graph);
     }
@@ -69,34 +55,32 @@ public class HierarchicalClusterLayoutManager implements LayoutManager {
         this.manager = manager;
     }
 
-    public void doLayout(LayoutGraph graph, Set<? extends Vertex> firstLayerHint, Set<? extends Vertex> lastLayerHint, Set<? extends Link> importantLinks) {
+    public void doLayout(LayoutGraph graph) {
 
         assert graph.verify();
 
-        HashMap<Cluster, List<Vertex>> lists = new HashMap<Cluster, List<Vertex>>();
+        HashMap<Cluster, List<Link>> listsConnection = new HashMap<>();
-        HashMap<Cluster, List<Link>> listsConnection = new HashMap<Cluster, List<Link>>();
+        HashMap<Cluster, HashMap<Port, ClusterInputSlotNode>> clusterInputSlotHash = new HashMap<>();
-        HashMap<Cluster, HashMap<Port, ClusterInputSlotNode>> clusterInputSlotHash = new HashMap<Cluster, HashMap<Port, ClusterInputSlotNode>>();
+        HashMap<Cluster, HashMap<Port, ClusterOutputSlotNode>> clusterOutputSlotHash = new HashMap<>();
-        HashMap<Cluster, HashMap<Port, ClusterOutputSlotNode>> clusterOutputSlotHash = new HashMap<Cluster, HashMap<Port, ClusterOutputSlotNode>>();
 
-        HashMap<Cluster, ClusterNode> clusterNodes = new HashMap<Cluster, ClusterNode>();
+        HashMap<Cluster, ClusterNode> clusterNodes = new HashMap<>();
-        HashMap<Cluster, Set<ClusterInputSlotNode>> clusterInputSlotSet = new HashMap<Cluster, Set<ClusterInputSlotNode>>();
+        HashMap<Cluster, Set<ClusterInputSlotNode>> clusterInputSlotSet = new HashMap<>();
-        HashMap<Cluster, Set<ClusterOutputSlotNode>> clusterOutputSlotSet = new HashMap<Cluster, Set<ClusterOutputSlotNode>>();
+        HashMap<Cluster, Set<ClusterOutputSlotNode>> clusterOutputSlotSet = new HashMap<>();
-        Set<Link> clusterEdges = new HashSet<Link>();
+        Set<Link> clusterEdges = new HashSet<>();
-        Set<Link> interClusterEdges = new HashSet<Link>();
+        Set<Link> interClusterEdges = new HashSet<>();
-        HashMap<Link, ClusterOutgoingConnection> linkClusterOutgoingConnection = new HashMap<Link, ClusterOutgoingConnection>();
+        HashMap<Link, ClusterOutgoingConnection> linkClusterOutgoingConnection = new HashMap<>();
-        HashMap<Link, InterClusterConnection> linkInterClusterConnection = new HashMap<Link, InterClusterConnection>();
+        HashMap<Link, InterClusterConnection> linkInterClusterConnection = new HashMap<>();
-        HashMap<Link, ClusterIngoingConnection> linkClusterIngoingConnection = new HashMap<Link, ClusterIngoingConnection>();
+        HashMap<Link, ClusterIngoingConnection> linkClusterIngoingConnection = new HashMap<>();
-        Set<ClusterNode> clusterNodeSet = new HashSet<ClusterNode>();
+        Set<ClusterNode> clusterNodeSet = new HashSet<>();
 
         Set<Cluster> cluster = graph.getClusters();
         int z = 0;
         for (Cluster c : cluster) {
-            lists.put(c, new ArrayList<Vertex>());
+            listsConnection.put(c, new ArrayList<>());
-            listsConnection.put(c, new ArrayList<Link>());
+            clusterInputSlotHash.put(c, new HashMap<>());
-            clusterInputSlotHash.put(c, new HashMap<Port, ClusterInputSlotNode>());
+            clusterOutputSlotHash.put(c, new HashMap<>());
-            clusterOutputSlotHash.put(c, new HashMap<Port, ClusterOutputSlotNode>());
+            clusterOutputSlotSet.put(c, new TreeSet<>());
-            clusterOutputSlotSet.put(c, new TreeSet<ClusterOutputSlotNode>());
+            clusterInputSlotSet.put(c, new TreeSet<>());
-            clusterInputSlotSet.put(c, new TreeSet<ClusterInputSlotNode>());
             ClusterNode cn = new ClusterNode(c, "" + z);
             clusterNodes.put(c, cn);
             clusterNodeSet.add(cn);
@@ -156,7 +140,7 @@ public class HierarchicalClusterLayoutManager implements LayoutManager {
                 }
 
                 if (outputSlotNode == null) {
-                    outputSlotNode = new ClusterOutputSlotNode(clusterNodes.get(fromCluster), "Out " + fromCluster.toString() + " " + samePort.toString());
+                    outputSlotNode = new ClusterOutputSlotNode(clusterNodes.get(fromCluster), "Out " + fromCluster.toString() + " " + samePort);
                     clusterOutputSlotSet.get(fromCluster).add(outputSlotNode);
                     ClusterOutgoingConnection conn = new ClusterOutgoingConnection(outputSlotNode, l);
                     outputSlotNode.setOutgoingConnection(conn);
@@ -171,16 +155,13 @@ public class HierarchicalClusterLayoutManager implements LayoutManager {
                 }
 
                 if (inputSlotNode == null) {
-                    inputSlotNode = new ClusterInputSlotNode(clusterNodes.get(toCluster), "In " + toCluster.toString() + " " + samePort.toString());
+                    inputSlotNode = new ClusterInputSlotNode(clusterNodes.get(toCluster), "In " + toCluster.toString() + " " + samePort);
                     clusterInputSlotSet.get(toCluster).add(inputSlotNode);
                 }
 
                 ClusterIngoingConnection conn = new ClusterIngoingConnection(inputSlotNode, l);
-                inputSlotNode.setIngoingConnection(conn);
                 clusterNodes.get(toCluster).addSubEdge(conn);
-                if (samePort != null) {
                 clusterInputSlotHash.get(toCluster).put(samePort, inputSlotNode);
-                }
 
                 linkClusterIngoingConnection.put(l, conn);
 
@@ -194,13 +175,13 @@ public class HierarchicalClusterLayoutManager implements LayoutManager {
         Timing t = null;
 
         if (TRACE) {
-            new Timing("Child timing");
+            t = new Timing("Child timing");
             t.start();
         }
 
         for (Cluster c : cluster) {
             ClusterNode n = clusterNodes.get(c);
-            subManager.doLayout(new LayoutGraph(n.getSubEdges(), n.getSubNodes()), new HashSet<Link>());
+            subManager.doLayout(new LayoutGraph(n.getSubEdges(), n.getSubNodes()), new HashSet<>());
             n.updateSize();
         }
 
@@ -235,7 +216,7 @@ public class HierarchicalClusterLayoutManager implements LayoutManager {
                 assert conn2 != null;
                 assert conn3 != null;
 
-                List<Point> points = new ArrayList<Point>();
+                List<Point> points = new ArrayList<>();
 
                 points.addAll(conn1.getControlPoints());
                 points.addAll(conn2.getControlPoints());

src/utils/IdealGraphVisualizer/HierarchicalLayout/src/main/java/com/sun/hotspot/igv/hierarchicallayout/HierarchicalLayoutManager.java

@@ -56,9 +56,9 @@ public class HierarchicalLayoutManager implements LayoutManager {
         SAME_OUTPUTS
     }
     // Options
-    private Combine combine;
+    private final Combine combine;
-    private int dummyWidth;
+    private final int dummyWidth;
-    private int dummyHeight;
+    private final int dummyHeight;
     private int xOffset;
     private int layerOffset;
     private int maxLayerLength;
@@ -71,14 +71,13 @@ public class HierarchicalLayoutManager implements LayoutManager {
     private HashMap<Vertex, LayoutNode> vertexToLayoutNode;
     private HashMap<Link, List<Point>> reversedLinkStartPoints;
     private HashMap<Link, List<Point>> reversedLinkEndPoints;
-    private HashMap<LayoutEdge, LayoutEdge> bottomEdgeHash;
     private HashMap<Link, List<Point>> splitStartPoints;
     private HashMap<Link, List<Point>> splitEndPoints;
     private LayoutGraph graph;
     private List<LayoutNode>[] layers;
     private int layerCount;
     private Set<? extends Link> importantLinks;
-    private Set<Link> linksToFollow;
+    private final Set<Link> linksToFollow;
 
     private class LayoutNode {
 
@@ -123,7 +122,7 @@ public class HierarchicalLayoutManager implements LayoutManager {
         }
     }
 
-    private abstract class AlgorithmPart {
+    private abstract static class AlgorithmPart {
 
         public void start() {
             if (CHECK) {
@@ -159,10 +158,6 @@ public class HierarchicalLayoutManager implements LayoutManager {
         }
     }
 
-    public HierarchicalLayoutManager() {
-        this(Combine.NONE);
-    }
-
     public HierarchicalLayoutManager(Combine b) {
         this.combine = b;
         this.dummyWidth = DUMMY_WIDTH;
@@ -183,10 +178,6 @@ public class HierarchicalLayoutManager implements LayoutManager {
         this.layerOffset = layerOffset;
     }
 
-    public int getMaxLayerLength() {
-        return maxLayerLength;
-    }
-
     public void setMaxLayerLength(int v) {
         maxLayerLength = v;
     }
@@ -216,7 +207,7 @@ public class HierarchicalLayoutManager implements LayoutManager {
 
     @Override
     public void doLayout(LayoutGraph graph) {
-        doLayout(graph, new HashSet<Link>());
+        doLayout(graph, new HashSet<>());
 
     }
 
@@ -231,7 +222,6 @@ public class HierarchicalLayoutManager implements LayoutManager {
         selfEdges = new HashSet<>();
         reversedLinkStartPoints = new HashMap<>();
         reversedLinkEndPoints = new HashMap<>();
-        bottomEdgeHash = new HashMap<>();
         nodes = new ArrayList<>();
         splitStartPoints = new HashMap<>();
         splitEndPoints = new HashMap<>();
@@ -452,7 +442,6 @@ public class HierarchicalLayoutManager implements LayoutManager {
                                 points.add(null);
                                 points.addAll(splitEndPoints.get(e.link));
 
-                                //checkPoints(points);
                                 if (reversedLinks.contains(e.link)) {
                                     Collections.reverse(points);
                                 }
@@ -476,7 +465,6 @@ public class HierarchicalLayoutManager implements LayoutManager {
                             if (reversedLinks.contains(e.link)) {
                                 Collections.reverse(points);
                             }
-                            //checkPoints(points);
                             assert !linkPositions.containsKey(e.link);
                             linkPositions.put(e.link, points);
                         }
@@ -538,48 +526,8 @@ public class HierarchicalLayoutManager implements LayoutManager {
         }
     }
 
-    private static class Segment {
+    private static final Comparator<LayoutNode> nodePositionComparator = Comparator.comparingInt(n -> n.pos);
-
+    private static final Comparator<LayoutNode> nodeProcessingDownComparator = (n1, n2) -> {
-        public float d;
-        public int orderNumber = -1;
-        public ArrayList<LayoutNode> nodes = new ArrayList<>();
-        public HashSet<Segment> succs = new HashSet<>();
-        public HashSet<Segment> preds = new HashSet<>();
-        public Region region;
-    }
-    private static final Comparator<Segment> segmentComparator = new Comparator<Segment>() {
-
-        @Override
-        public int compare(Segment s1, Segment s2) {
-            return s1.orderNumber - s2.orderNumber;
-        }
-    };
-
-    private static class Region {
-
-        public float d;
-        public int minOrderNumber;
-        public SortedSet<Segment> segments = new TreeSet<>(segmentComparator);
-        public HashSet<Region> succs = new HashSet<>(4);
-        public HashSet<Region> preds = new HashSet<>(4);
-    }
-    private static final Comparator<Region> regionComparator = new Comparator<Region>() {
-
-        @Override
-        public int compare(Region r1, Region r2) {
-            return r1.minOrderNumber - r2.minOrderNumber;
-        }
-    };
-    private static final Comparator<LayoutNode> nodePositionComparator = new Comparator<LayoutNode>() {
-
-        @Override
-        public int compare(LayoutNode n1, LayoutNode n2) {
-            return n1.pos - n2.pos;
-        }
-    };
-    private static final Comparator<LayoutNode> nodeProcessingDownComparator = new Comparator<LayoutNode>() {
-        @Override
-        public int compare(LayoutNode n1, LayoutNode n2) {
         int n1VIP = 0;
         for (LayoutEdge e : n1.preds) {
             if (e.vip) {
@@ -605,12 +553,8 @@ public class HierarchicalLayoutManager implements LayoutManager {
             return 1;
         }
         return n1.preds.size() - n2.preds.size();
-        }
     };
-    private static final Comparator<LayoutNode> nodeProcessingUpComparator = new Comparator<LayoutNode>() {
+    private static final Comparator<LayoutNode> nodeProcessingUpComparator = (n1, n2) -> {
-
-        @Override
-        public int compare(LayoutNode n1, LayoutNode n2) {
         int n1VIP = 0;
         for (LayoutEdge e : n1.succs) {
             if (e.vip) {
@@ -636,7 +580,6 @@ public class HierarchicalLayoutManager implements LayoutManager {
             return 1;
         }
         return n1.succs.size() - n2.succs.size();
-        }
     };
 
     private class AssignXCoordinates extends AlgorithmPart {
@@ -683,22 +626,19 @@ public class HierarchicalLayoutManager implements LayoutManager {
             for (int i = 0; i < SWEEP_ITERATIONS; i++) {
                 sweepDown();
                 adjustSpace();
-                sweepUp(false);
+                sweepUp();
                 adjustSpace();
             }
 
             sweepDown();
             adjustSpace();
-            sweepUp(true);
+            sweepUp();
         }
 
         private void adjustSpace() {
             for (int i = 0; i < layers.length; i++) {
-                //               space[i] = new ArrayList<>();
-                int curX = 0;
                 for (LayoutNode n : layers[i]) {
                     space[i].add(n.x);
-//                    curX += n.width + xOffset;
                 }
             }
         }
@@ -781,7 +721,7 @@ public class HierarchicalLayoutManager implements LayoutManager {
             }
         }
 
-        private void sweepUp(boolean onlyDummies) {
+        private void sweepUp() {
             for (int i = layers.length - 1; i >= 0; i--) {
                 NodeRow r = new NodeRow(space[i]);
                 for (LayoutNode n : upProcessingOrder[i]) {
@@ -791,16 +731,6 @@ public class HierarchicalLayoutManager implements LayoutManager {
             }
         }
 
-        private void doubleSweep() {
-            for (int i = layers.length - 2; i >= 0; i--) {
-                NodeRow r = new NodeRow(space[i]);
-                for (LayoutNode n : upProcessingOrder[i]) {
-                    int optimal = calculateOptimalBoth(n);
-                    r.insert(n, optimal);
-                }
-            }
-        }
-
         private void sweepDown() {
             for (int i = 1; i < layers.length; i++) {
                 NodeRow r = new NodeRow(space[i]);
@@ -814,8 +744,8 @@ public class HierarchicalLayoutManager implements LayoutManager {
 
     private static class NodeRow {
 
-        private TreeSet<LayoutNode> treeSet;
+        private final TreeSet<LayoutNode> treeSet;
-        private ArrayList<Integer> space;
+        private final ArrayList<Integer> space;
 
         public NodeRow(ArrayList<Integer> space) {
             treeSet = new TreeSet<>(nodePositionComparator);
@@ -832,7 +762,7 @@ public class HierarchicalLayoutManager implements LayoutManager {
 
             SortedSet<LayoutNode> headSet = treeSet.headSet(n);
 
-            LayoutNode leftNeighbor = null;
+            LayoutNode leftNeighbor;
             int minX = Integer.MIN_VALUE;
             if (!headSet.isEmpty()) {
                 leftNeighbor = headSet.last();
@@ -843,7 +773,7 @@ public class HierarchicalLayoutManager implements LayoutManager {
                 n.x = minX;
             } else {
 
-                LayoutNode rightNeighbor = null;
+                LayoutNode rightNeighbor;
                 SortedSet<LayoutNode> tailSet = treeSet.tailSet(n);
                 int maxX = Integer.MAX_VALUE;
                 if (!tailSet.isEmpty()) {
@@ -851,11 +781,7 @@ public class HierarchicalLayoutManager implements LayoutManager {
                     maxX = rightNeighbor.x - offset(n, rightNeighbor) - n.width;
                 }
 
-                if (pos > maxX) {
+                n.x = Math.min(pos, maxX);
-                    n.x = maxX;
-                } else {
-                    n.x = pos;
-                }
 
                 assert minX <= maxX : minX + " vs " + maxX;
             }
@@ -863,13 +789,7 @@ public class HierarchicalLayoutManager implements LayoutManager {
             treeSet.add(n);
         }
     }
-    private static Comparator<LayoutNode> crossingNodeComparator = new Comparator<LayoutNode>() {
+    private static final Comparator<LayoutNode> crossingNodeComparator = Comparator.comparingInt(n -> n.crossingNumber);
-
-        @Override
-        public int compare(LayoutNode n1, LayoutNode n2) {
-            return n1.crossingNumber - n2.crossingNumber;
-        }
-    };
 
     private class CrossingReduction extends AlgorithmPart {
 
@@ -945,10 +865,9 @@ public class HierarchicalLayoutManager implements LayoutManager {
         }
 
         private void updatePositions() {
-
+            for (List<LayoutNode> layer : layers) {
-            for (int i = 0; i < layers.length; i++) {
                 int z = 0;
-                for (LayoutNode n : layers[i]) {
+                for (LayoutNode n : layer) {
                     n.pos = z;
                     z++;
                 }
@@ -1088,18 +1007,18 @@ public class HierarchicalLayoutManager implements LayoutManager {
         protected void run() {
             int curY = 0;
 
-            for (int i = 0; i < layers.length; i++) {
+            for (List<LayoutNode> layer : layers) {
                 int maxHeight = 0;
                 int baseLine = 0;
                 int bottomBaseLine = 0;
-                for (LayoutNode n : layers[i]) {
+                for (LayoutNode n : layer) {
                     maxHeight = Math.max(maxHeight, n.height - n.yOffset - n.bottomYOffset);
                     baseLine = Math.max(baseLine, n.yOffset);
                     bottomBaseLine = Math.max(bottomBaseLine, n.bottomYOffset);
                 }
 
                 int maxXOffset = 0;
-                for (LayoutNode n : layers[i]) {
+                for (LayoutNode n : layer) {
                     if (n.vertex == null) {
                         // Dummy node
                         n.y = curY;
@@ -1147,13 +1066,7 @@ public class HierarchicalLayoutManager implements LayoutManager {
 
             if (combine == Combine.SAME_OUTPUTS) {
 
-                Comparator<LayoutEdge> comparator = new Comparator<LayoutEdge>() {
+                Comparator<LayoutEdge> comparator = Comparator.comparingInt(e -> e.to.layer);
-
-                    @Override
-                    public int compare(LayoutEdge e1, LayoutEdge e2) {
-                        return e1.to.layer - e2.to.layer;
-                    }
-                };
                 HashMap<Integer, List<LayoutEdge>> portHash = new HashMap<>();
                 ArrayList<LayoutNode> currentNodes = new ArrayList<>(nodes);
                 for (LayoutNode n : currentNodes) {
@@ -1165,12 +1078,12 @@ public class HierarchicalLayoutManager implements LayoutManager {
                     for (LayoutEdge e : succs) {
                         assert e.from.layer < e.to.layer;
                         if (e.from.layer != e.to.layer - 1) {
-                            if (maxLayerLength != -1 && e.to.layer - e.from.layer > maxLayerLength/* && e.to.preds.size() > 1 && e.from.succs.size() > 1*/) {
+                            if (maxLayerLength != -1 && e.to.layer - e.from.layer > maxLayerLength) {
                                 assert maxLayerLength > 2;
                                 e.to.preds.remove(e);
                                 e.from.succs.remove(e);
 
-                                LayoutEdge topEdge = null;
+                                LayoutEdge topEdge;
 
                                 if (combine == Combine.SAME_OUTPUTS && topNodeHash.containsKey(e.relativeFrom)) {
                                     LayoutNode topNode = topNodeHash.get(e.relativeFrom);
@@ -1193,19 +1106,19 @@ public class HierarchicalLayoutManager implements LayoutManager {
                                     topEdge = new LayoutEdge();
                                     topEdge.relativeFrom = e.relativeFrom;
                                     topEdge.from = e.from;
-                                    topEdge.relativeTo = topNode.width / 2;
+                                    topEdge.relativeTo = 0;
                                     topEdge.to = topNode;
                                     topEdge.link = e.link;
                                     topEdge.vip = e.vip;
                                     e.from.succs.add(topEdge);
                                     topNode.preds.add(topEdge);
                                     topNodeHash.put(e.relativeFrom, topNode);
-                                    bottomNodeHash.put(e.relativeFrom, new HashMap<Integer, LayoutNode>());
+                                    bottomNodeHash.put(e.relativeFrom, new HashMap<>());
                                 }
 
                                 HashMap<Integer, LayoutNode> hash = bottomNodeHash.get(e.relativeFrom);
 
-                                LayoutNode bottomNode = null;
+                                LayoutNode bottomNode;
                                 if (hash.containsKey(e.to.layer)) {
                                     bottomNode = hash.get(e.to.layer);
                                 } else {
@@ -1226,13 +1139,12 @@ public class HierarchicalLayoutManager implements LayoutManager {
                                 bottomEdge.link = e.link;
                                 bottomEdge.vip = e.vip;
                                 e.to.preds.add(bottomEdge);
-                                bottomEdgeHash.put(topEdge, bottomEdge);
                                 bottomNode.succs.add(bottomEdge);
 
                             } else {
                                 Integer i = e.relativeFrom;
                                 if (!portHash.containsKey(i)) {
-                                    portHash.put(i, new ArrayList<LayoutEdge>());
+                                    portHash.put(i, new ArrayList<>());
                                 }
                                 portHash.get(i).add(e);
                             }
@@ -1565,7 +1477,7 @@ public class HierarchicalLayoutManager implements LayoutManager {
 
                 final int offset = xOffset + DUMMY_WIDTH;
 
-                int curX = 0;
+                int curY = 0;
                 int curWidth = node.width + reversedDown.size() * offset;
                 for (int pos : reversedDown) {
                     ArrayList<LayoutEdge> reversedSuccs = new ArrayList<>();
@@ -1577,15 +1489,15 @@ public class HierarchicalLayoutManager implements LayoutManager {
                     }
 
                     ArrayList<Point> startPoints = new ArrayList<>();
-                    startPoints.add(new Point(curWidth, curX));
+                    startPoints.add(new Point(curWidth, curY));
-                    startPoints.add(new Point(pos, curX));
+                    startPoints.add(new Point(pos, curY));
                     startPoints.add(new Point(pos, reversedDown.size() * offset));
                     for (LayoutEdge e : reversedSuccs) {
                         reversedLinkStartPoints.put(e.link, startPoints);
                     }
 
-                    node.inOffsets.put(pos, -curX);
+                    node.inOffsets.put(pos, -curY);
-                    curX += offset;
+                    curY += offset;
                     node.height += offset;
                     node.yOffset += offset;
                     curWidth -= offset;
@@ -1597,13 +1509,7 @@ public class HierarchicalLayoutManager implements LayoutManager {
                 }
                 node.width += widthFactor * offset;
 
-                if (hasReversedDown) {
+                int curX = 0;
-                    curX = -offset;
-                } else {
-                    curX = offset;
-                }
-
-                curX = 0;
                 int minX = 0;
                 if (hasReversedDown) {
                     minX = -offset * reversedUp.size();
@@ -1761,10 +1667,7 @@ public class HierarchicalLayoutManager implements LayoutManager {
             }
         }
     }
-    private Comparator<Link> linkComparator = new Comparator<Link>() {
+    private final Comparator<Link> linkComparator = (l1, l2) -> {
-
-        @Override
-        public int compare(Link l1, Link l2) {
         if (l1.isVIP() && !l2.isVIP()) {
             return -1;
         }
@@ -1787,7 +1690,6 @@ public class HierarchicalLayoutManager implements LayoutManager {
         }
         result = l1.getTo().getRelativePosition().x - l2.getTo().getRelativePosition().x;
         return result;
-        }
     };
 
     private class BuildDatastructure extends AlgorithmPart {
@@ -1797,11 +1699,8 @@ public class HierarchicalLayoutManager implements LayoutManager {
             // Set up nodes
             List<Vertex> vertices = new ArrayList<>(graph.getVertices());
             // Order roots first to create more natural layer assignments.
-            Collections.sort(vertices,
+            vertices.sort((Vertex a, Vertex b) ->
-                             (Vertex a, Vertex b) ->
+                    a.isRoot() == b.isRoot() ? a.compareTo(b) : Boolean.compare(b.isRoot(), a.isRoot()));
-                             a.isRoot() == b.isRoot() ?
-                             a.compareTo(b) :
-                             Boolean.compare(b.isRoot(), a.isRoot()));
 
             for (Vertex v : vertices) {
                 LayoutNode node = new LayoutNode();

src/utils/IdealGraphVisualizer/HierarchicalLayout/src/main/java/com/sun/hotspot/igv/hierarchicallayout/InterClusterConnection.java

@@ -23,9 +23,9 @@
  */
 package com.sun.hotspot.igv.hierarchicallayout;
 
+import com.sun.hotspot.igv.layout.Cluster;
 import com.sun.hotspot.igv.layout.Link;
 import com.sun.hotspot.igv.layout.Port;
-import com.sun.hotspot.igv.layout.Cluster;
 import java.awt.Point;
 import java.util.ArrayList;
 import java.util.List;
@@ -36,22 +36,14 @@ import java.util.List;
  */
 public class InterClusterConnection implements Link {
 
-    private Port inputSlot;
+    private final Port inputSlot;
-    private Port outputSlot;
+    private final Port outputSlot;
     private List<Point> intermediatePoints;
-    private ClusterInputSlotNode inputSlotNode;
-    private ClusterOutputSlotNode outputSlotNode;
 
     public InterClusterConnection(ClusterOutputSlotNode outputSlotNode, ClusterInputSlotNode inputSlotNode) {
-        this.outputSlotNode = outputSlotNode;
-        this.inputSlotNode = inputSlotNode;
         this.inputSlot = inputSlotNode.getInputSlot();
         this.outputSlot = outputSlotNode.getOutputSlot();
-        intermediatePoints = new ArrayList<Point>();
+        this.intermediatePoints = new ArrayList<>();
-    }
-
-    public ClusterOutputSlotNode getOutputSlotNode() {
-        return outputSlotNode;
     }
 
     public Port getTo() {

src/utils/IdealGraphVisualizer/HierarchicalLayout/src/main/java/com/sun/hotspot/igv/hierarchicallayout/LinearLayoutManager.java

@@ -41,7 +41,7 @@ public class LinearLayoutManager implements LayoutManager {
 
     @Override
     public void doLayout(LayoutGraph graph) {
-        doLayout(graph, new HashSet<Link>());
+        doLayout(graph, new HashSet<>());
     }
 
     @Override

src/utils/IdealGraphVisualizer/HierarchicalLayout/src/main/java/com/sun/hotspot/igv/hierarchicallayout/Node.java

@@ -1,161 +0,0 @@
-/*
- * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- *
- */
-package com.sun.hotspot.igv.hierarchicallayout;
-
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-
-/**
- *
- * @author Thomas Wuerthinger
- */
-public class Node<N, E> {
-
-    private N data;
-    private List<Edge<N, E>> inEdges;
-    private List<Edge<N, E>> outEdges;
-    private boolean visited;
-    private boolean active;
-    private boolean reachable;
-    private Graph<N, E> graph;
-
-    protected boolean isVisited() {
-        return visited;
-    }
-
-    protected void setVisited(boolean b) {
-        visited = b;
-    }
-
-    protected boolean isReachable() {
-        return reachable;
-    }
-
-    protected void setReachable(boolean b) {
-        reachable = b;
-    }
-
-    protected boolean isActive() {
-        return active;
-    }
-
-    protected void setActive(boolean b) {
-        active = b;
-    }
-
-    public int getInDegree() {
-        return getInDegree(true);
-    }
-
-    public int getInDegree(boolean countSelfLoops) {
-        if (countSelfLoops) {
-            return inEdges.size();
-        } else {
-            int cnt = 0;
-            for (Edge<N, E> e : inEdges) {
-                if (e.getSource() != this) {
-                    cnt++;
-                }
-            }
-            return cnt;
-        }
-    }
-
-    public int getOutDegree() {
-        return outEdges.size();
-    }
-
-    protected Node(Graph<N, E> graph, N data) {
-        setData(data);
-        this.graph = graph;
-        inEdges = new ArrayList<>();
-        outEdges = new ArrayList<>();
-    }
-
-    protected void addInEdge(Edge<N, E> e) {
-        inEdges.add(e);
-    }
-
-    public Graph<N, E> getGraph() {
-        return graph;
-    }
-
-    protected void addOutEdge(Edge<N, E> e) {
-        outEdges.add(e);
-    }
-
-    protected void removeInEdge(Edge<N, E> e) {
-        //assert inEdges.contains(e);
-        inEdges.remove(e);
-    }
-
-    protected void removeOutEdge(Edge<N, E> e) {
-        //assert outEdges.contains(e);
-        outEdges.remove(e);
-    }
-
-    public List<Edge<N, E>> getInEdges() {
-        return Collections.unmodifiableList(inEdges);
-    }
-
-    public List<Edge<N, E>> getOutEdges() {
-        return Collections.unmodifiableList(outEdges);
-    }
-
-    public List<Node<N, E>> getSuccessors() {
-        ArrayList<Node<N, E>> succ = new ArrayList<>();
-        for (Edge<N, E> e : getOutEdges()) {
-            Node<N, E> n = e.getDest();
-            if (!succ.contains(n)) {
-                succ.add(n);
-            }
-        }
-        return succ;
-    }
-
-    public List<Node<N, E>> getPredecessors() {
-        ArrayList<Node<N, E>> pred = new ArrayList<>();
-        for (Edge<N, E> e : getInEdges()) {
-            Node<N, E> n = e.getSource();
-            if (!pred.contains(n)) {
-                pred.add(n);
-            }
-        }
-        return pred;
-    }
-
-    public N getData() {
-        return data;
-    }
-
-    public void setData(N d) {
-        data = d;
-    }
-
-    @Override
-    public String toString() {
-        return "Node: " + data;
-    }
-}

src/utils/IdealGraphVisualizer/HierarchicalLayout/src/main/java/com/sun/hotspot/igv/hierarchicallayout/Timing.java

@@ -31,7 +31,7 @@ public class Timing {
 
     private long lastValue;
     private long sum;
-    private String name;
+    private final String name;
 
     public Timing(String name) {
         this.name = name;
@@ -49,7 +49,7 @@ public class Timing {
     }
 
     public void print() {
-        System.out.println(toString());
+        System.out.println();
     }
 
     public void start() {

src/utils/IdealGraphVisualizer/Layout/src/main/java/com/sun/hotspot/igv/layout/Cluster.java

@@ -33,11 +33,9 @@ import java.util.Set;
  */
 public interface Cluster extends Comparable<Cluster> {
 
-    public Cluster getOuter();
+    void setBounds(Rectangle r);
 
-    public void setBounds(Rectangle r);
+    Set<? extends Cluster> getSuccessors();
 
-    public Set<? extends Cluster> getSuccessors();
+    Dimension getNodeOffset();
-
-    public Dimension getNodeOffset();
 }

src/utils/IdealGraphVisualizer/Layout/src/main/java/com/sun/hotspot/igv/layout/LayoutGraph.java

@@ -31,14 +31,14 @@ import java.util.*;
  */
 public class LayoutGraph {
 
-    private Set<? extends Link> links;
+    private final Set<? extends Link> links;
-    private SortedSet<Vertex> vertices;
+    private final SortedSet<Vertex> vertices;
-    private HashMap<Vertex, Set<Port>> inputPorts;
+    private final HashMap<Vertex, Set<Port>> inputPorts;
-    private HashMap<Vertex, Set<Port>> outputPorts;
+    private final HashMap<Vertex, Set<Port>> outputPorts;
-    private HashMap<Port, Set<Link>> portLinks;
+    private final HashMap<Port, Set<Link>> portLinks;
 
     public LayoutGraph(Set<? extends Link> links) {
-        this(links, new HashSet<Vertex>());
+        this(links, new HashSet<>());
     }
 
     public LayoutGraph(Set<? extends Link> links, Set<? extends Vertex> additionalVertices) {
@@ -61,8 +61,8 @@ public class LayoutGraph {
 
             if (!vertices.contains(v1)) {
 
-                outputPorts.put(v1, new HashSet<Port>(1));
+                outputPorts.put(v1, new HashSet<>(1));
-                inputPorts.put(v1, new HashSet<Port>(3));
+                inputPorts.put(v1, new HashSet<>(3));
                 vertices.add(v1);
                 assert vertices.contains(v1);
             }
@@ -70,8 +70,8 @@ public class LayoutGraph {
             if (!vertices.contains(v2)) {
                 vertices.add(v2);
                 assert vertices.contains(v2);
-                outputPorts.put(v2, new HashSet<Port>(1));
+                outputPorts.put(v2, new HashSet<>(1));
-                inputPorts.put(v2, new HashSet<Port>(3));
+                inputPorts.put(v2, new HashSet<>(3));
             }
 
             if (!portLinks.containsKey(p)) {
@@ -80,7 +80,7 @@ public class LayoutGraph {
             }
 
             if (!portLinks.containsKey(p2)) {
-                portLinks.put(p2, new HashSet<Link>(3));
+                portLinks.put(p2, new HashSet<>(3));
             }
 
             outputPorts.get(v1).add(p);
@@ -92,10 +92,9 @@ public class LayoutGraph {
 
         for (Vertex v : additionalVertices) {
             if (!vertices.contains(v)) {
-                outputPorts.put(v, new HashSet<Port>(1));
+                outputPorts.put(v, new HashSet<>(1));
-                inputPorts.put(v, new HashSet<Port>(3));
+                inputPorts.put(v, new HashSet<>(3));
                 vertices.add(v);
-                vertices.contains(v);
             }
         }
     }
@@ -184,12 +183,12 @@ public class LayoutGraph {
     }
 
     public Set<Vertex> findRootVertices() {
-        return findRootVertices(new HashSet<Vertex>());
+        return findRootVertices(new HashSet<>());
     }
 
     public SortedSet<Cluster> getClusters() {
 
-        SortedSet<Cluster> clusters = new TreeSet<Cluster>();
+        SortedSet<Cluster> clusters = new TreeSet<>();
         for (Vertex v : getVertices()) {
             if (v.getCluster() != null) {
                 clusters.add(v.getCluster());

src/utils/IdealGraphVisualizer/Layout/src/main/java/com/sun/hotspot/igv/layout/LayoutManager.java

@@ -31,7 +31,7 @@ import java.util.Set;
  */
 public interface LayoutManager {
 
-    public void doLayout(LayoutGraph graph);
+    void doLayout(LayoutGraph graph);
 
-    public void doLayout(LayoutGraph graph, Set<? extends Link> importantLinks);
+    void doLayout(LayoutGraph graph, Set<? extends Link> importantLinks);
 }

src/utils/IdealGraphVisualizer/Layout/src/main/java/com/sun/hotspot/igv/layout/Link.java

@@ -32,17 +32,17 @@ import java.util.List;
  */
 public interface Link {
 
-    public Port getFrom();
+    Port getFrom();
 
-    public Cluster getFromCluster();
+    Cluster getFromCluster();
 
-    public Port getTo();
+    Port getTo();
 
-    public Cluster getToCluster();
+    Cluster getToCluster();
 
-    public boolean isVIP();
+    boolean isVIP();
 
-    public List<Point> getControlPoints();
+    List<Point> getControlPoints();
 
-    public void setControlPoints(List<Point> list);
+    void setControlPoints(List<Point> list);
 }

src/utils/IdealGraphVisualizer/Layout/src/main/java/com/sun/hotspot/igv/layout/Port.java

@@ -31,7 +31,7 @@ import java.awt.Point;
  */
 public interface Port {
 
-    public Vertex getVertex();
+    Vertex getVertex();
 
-    public Point getRelativePosition();
+    Point getRelativePosition();
 }

src/utils/IdealGraphVisualizer/Layout/src/main/java/com/sun/hotspot/igv/layout/Vertex.java

@@ -32,13 +32,13 @@ import java.awt.Point;
  */
 public interface Vertex extends Comparable<Vertex> {
 
-    public Dimension getSize();
+    Dimension getSize();
 
-    public Point getPosition();
+    Point getPosition();
 
-    public void setPosition(Point p);
+    void setPosition(Point p);
 
-    public boolean isRoot();
+    boolean isRoot();
 
-    public Cluster getCluster();
+    Cluster getCluster();
 }

src/utils/IdealGraphVisualizer/NetworkConnection/src/main/java/com/sun/hotspot/igv/connection/Client.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -24,8 +24,6 @@
  */
 package com.sun.hotspot.igv.connection;
 
-import com.sun.hotspot.igv.data.GraphDocument;
-import com.sun.hotspot.igv.data.serialization.BinaryParser;
 import com.sun.hotspot.igv.data.serialization.Parser;
 import com.sun.hotspot.igv.data.services.GroupCallback;
 import java.io.IOException;
@@ -33,16 +31,12 @@ import java.nio.channels.SocketChannel;
 import org.openide.util.Exceptions;
 
 public class Client implements Runnable {
-    private final boolean binary;
     private final SocketChannel socket;
-    private final GraphDocument rootDocument;
     private final GroupCallback callback;
 
-    public Client(SocketChannel socket, GraphDocument rootDocument, GroupCallback callback, boolean  binary) {
+    public Client(SocketChannel socket, GroupCallback callback) {
         this.callback = callback;
         this.socket = socket;
-        this.binary = binary;
-        this.rootDocument = rootDocument;
     }
 
     @Override
@@ -51,13 +45,8 @@ public class Client implements Runnable {
         try {
             final SocketChannel channel = socket;
             channel.configureBlocking(true);
-            if (binary) {
-                new BinaryParser(channel, null, rootDocument, callback).parse();
-            } else {
-                // signal readiness to client VM (old protocol)
             channel.socket().getOutputStream().write('y');
             new Parser(channel, null, callback).parse();
-            }
         } catch (IOException ex) {
             Exceptions.printStackTrace(ex);
         } finally {

src/utils/IdealGraphVisualizer/NetworkConnection/src/main/java/com/sun/hotspot/igv/connection/Server.java

@@ -24,7 +24,6 @@
  */
 package com.sun.hotspot.igv.connection;
 
-import com.sun.hotspot.igv.data.GraphDocument;
 import com.sun.hotspot.igv.data.services.GroupCallback;
 import com.sun.hotspot.igv.settings.Settings;
 import java.io.IOException;
@@ -42,16 +41,12 @@ import org.openide.util.RequestProcessor;
  * @author Thomas Wuerthinger
  */
 public class Server implements PreferenceChangeListener {
-    private final boolean binary;
     private ServerSocketChannel serverSocket;
-    private final GraphDocument rootDocument;
     private final GroupCallback callback;
     private int port;
     private Runnable serverRunnable;
 
-    public Server(GraphDocument rootDocument, GroupCallback callback, boolean binary) {
+    public Server(GroupCallback callback) {
-        this.binary = binary;
-        this.rootDocument = rootDocument;
         this.callback = callback;
         initializeNetwork();
         Settings.get().addPreferenceChangeListener(this);
@@ -59,22 +54,20 @@ public class Server implements PreferenceChangeListener {
 
     @Override
     public void preferenceChange(PreferenceChangeEvent e) {
-
+        int curPort = Integer.parseInt(Settings.get().get(Settings.PORT, Settings.PORT_DEFAULT));
-        int curPort = Integer.parseInt(Settings.get().get(binary ? Settings.PORT_BINARY : Settings.PORT, binary ? Settings.PORT_BINARY_DEFAULT : Settings.PORT_DEFAULT));
         if (curPort != port) {
             initializeNetwork();
         }
     }
 
     private void initializeNetwork() {
-
+        int curPort = Integer.parseInt(Settings.get().get(Settings.PORT, Settings.PORT_DEFAULT));
-        int curPort = Integer.parseInt(Settings.get().get(binary ? Settings.PORT_BINARY : Settings.PORT, binary ? Settings.PORT_BINARY_DEFAULT : Settings.PORT_DEFAULT));
         this.port = curPort;
         try {
             serverSocket = ServerSocketChannel.open();
             serverSocket.bind(new InetSocketAddress(curPort));
         } catch (Throwable ex) {
-            NotifyDescriptor message = new NotifyDescriptor.Message("Could not create server. Listening for incoming binary data is disabled.", NotifyDescriptor.ERROR_MESSAGE);
+            NotifyDescriptor message = new NotifyDescriptor.Message("Could not create server. Listening for incoming data is disabled.", NotifyDescriptor.ERROR_MESSAGE);
             DialogDisplayer.getDefault().notifyLater(message);
             return;
         }
@@ -90,10 +83,10 @@ public class Server implements PreferenceChangeListener {
                             clientSocket.close();
                             return;
                         }
-                        RequestProcessor.getDefault().post(new Client(clientSocket, rootDocument, callback, binary), 0, Thread.MAX_PRIORITY);
+                        RequestProcessor.getDefault().post(new Client(clientSocket, callback), 0, Thread.MAX_PRIORITY);
                     } catch (IOException ex) {
                         serverSocket = null;
-                        NotifyDescriptor message = new NotifyDescriptor.Message("Error during listening for incoming connections. Listening for incoming binary data is disabled.", NotifyDescriptor.ERROR_MESSAGE);
+                        NotifyDescriptor message = new NotifyDescriptor.Message("Error during listening for incoming connections. Listening for incoming data is disabled.", NotifyDescriptor.ERROR_MESSAGE);
                         DialogDisplayer.getDefault().notifyLater(message);
                         return;
                     }

src/utils/IdealGraphVisualizer/SelectionCoordinator/src/main/java/com/sun/hotspot/igv/selectioncoordinator/SelectionCoordinator.java

@@ -35,11 +35,11 @@ import java.util.Set;
  */
 public class SelectionCoordinator {
 
-    private static SelectionCoordinator singleInstance = new SelectionCoordinator();
+    private static final SelectionCoordinator singleInstance = new SelectionCoordinator();
-    private Set<Object> selectedObjects;
+    private final Set<Integer> selectedObjects;
-    private Set<Object> highlightedObjects;
+    private final Set<Integer> highlightedObjects;
-    private ChangedEvent<SelectionCoordinator> selectedChangedEvent;
+    private final ChangedEvent<SelectionCoordinator> selectedChangedEvent;
-    private ChangedEvent<SelectionCoordinator> highlightedChangedEvent;
+    private final ChangedEvent<SelectionCoordinator> highlightedChangedEvent;
 
     public static SelectionCoordinator getInstance() {
         return singleInstance;
@@ -52,11 +52,11 @@ public class SelectionCoordinator {
         highlightedObjects = new HashSet<>();
     }
 
-    public Set<Object> getSelectedObjects() {
+    public Set<Integer> getSelectedObjects() {
         return Collections.unmodifiableSet(selectedObjects);
     }
 
-    public Set<Object> getHighlightedObjects() {
+    public Set<Integer> getHighlightedObjects() {
         return Collections.unmodifiableSet(highlightedObjects);
     }
 
@@ -68,72 +68,18 @@ public class SelectionCoordinator {
         return selectedChangedEvent;
     }
 
-    public void addHighlighted(Object o) {
-        if (!highlightedObjects.contains(o)) {
-            highlightedObjects.add(o);
-            highlightedObjectsChanged();
-        }
-    }
 
-    public void removeHighlighted(Object o) {
+    public void setSelectedObjects(Set<Integer> s) {
-        if (highlightedObjects.contains(o)) {
-            highlightedObjects.remove(o);
-            highlightedObjectsChanged();
-        }
-    }
-
-    public void addAllHighlighted(Set<? extends Object> s) {
-        int oldSize = highlightedObjects.size();
-        highlightedObjects.addAll(s);
-        if (oldSize != highlightedObjects.size()) {
-            highlightedObjectsChanged();
-        }
-    }
-
-    public void removeAllHighlighted(Set<? extends Object> s) {
-        int oldSize = highlightedObjects.size();
-        highlightedObjects.removeAll(s);
-        if (oldSize != highlightedObjects.size()) {
-            highlightedObjectsChanged();
-        }
-    }
-
-    private void highlightedObjectsChanged() {
-        highlightedChangedEvent.fire();
-
-    }
-
-    public void addAllSelected(Set<? extends Object> s) {
-        int oldSize = selectedObjects.size();
-        selectedObjects.addAll(s);
-        if (oldSize != selectedObjects.size()) {
-            selectedObjectsChanged();
-        }
-    }
-
-    public void removeAllSelected(Set<? extends Object> s) {
-        int oldSize = selectedObjects.size();
-        selectedObjects.removeAll(s);
-        if (oldSize != selectedObjects.size()) {
-            selectedObjectsChanged();
-        }
-    }
-
-    public void setSelectedObjects(Set<? extends Object> s) {
         assert s != null;
         selectedObjects.clear();
         selectedObjects.addAll(s);
-        selectedObjectsChanged();
+        getSelectedChangedEvent().fire();
     }
 
-    private void selectedObjectsChanged() {
+    public void setHighlightedObjects(Set<Integer> s) {
-        selectedChangedEvent.fire();
-    }
-
-    public void setHighlightedObjects(Set<? extends Object> s) {
         assert s != null;
-        this.highlightedObjects.clear();
+        highlightedObjects.clear();
-        this.highlightedObjects.addAll(s);
+        highlightedObjects.addAll(s);
-        highlightedObjectsChanged();
+        getHighlightedChangedEvent().fire();
     }
 }

src/utils/IdealGraphVisualizer/ServerCompiler/src/main/java/com/sun/hotspot/igv/servercompiler/ServerCompilerScheduler.java

@@ -24,6 +24,9 @@
  */
 package com.sun.hotspot.igv.servercompiler;
 
+import com.ibm.wala.util.graph.Graph;
+import com.ibm.wala.util.graph.dominators.Dominators;
+import com.ibm.wala.util.graph.impl.SlowSparseNumberedGraph;
 import com.sun.hotspot.igv.data.InputBlock;
 import com.sun.hotspot.igv.data.InputEdge;
 import com.sun.hotspot.igv.data.InputGraph;
@@ -33,9 +36,6 @@ import java.util.*;
 import java.util.function.Predicate;
 import org.openide.ErrorManager;
 import org.openide.util.lookup.ServiceProvider;
-import com.ibm.wala.util.graph.Graph;
-import com.ibm.wala.util.graph.impl.SlowSparseNumberedGraph;
-import com.ibm.wala.util.graph.dominators.Dominators;
 
 /**
  *
@@ -122,13 +122,7 @@ public class ServerCompilerScheduler implements Scheduler {
     Map<Node, List<Node>> controlSuccs = new HashMap<>();
     // Nodes reachable in backward traversal from root.
     private Map<InputBlock, InputBlock> dominatorMap;
-    private static final Comparator<InputEdge> edgeComparator = new Comparator<InputEdge>() {
+    private static final Comparator<InputEdge> edgeComparator = Comparator.comparingInt(InputEdge::getToIndex);
-
-        @Override
-        public int compare(InputEdge o1, InputEdge o2) {
-            return o1.getToIndex() - o2.getToIndex();
-        }
-    };
 
     public void buildBlocks() {
 
@@ -173,7 +167,7 @@ public class ServerCompilerScheduler implements Scheduler {
                 rootBlock = block;
             }
             blockCount++;
-            Set<Node> blockTerminators = new HashSet<Node>();
+            Set<Node> blockTerminators = new HashSet<>();
             // Move forwards until a terminator node is found, assigning all
             // visited nodes to the current block.
             while (true) {
@@ -283,12 +277,12 @@ public class ServerCompilerScheduler implements Scheduler {
         Node n = new Node();
         n.preds.add(p);
         n.succs.add(s);
-        controlSuccs.put(n, Arrays.asList(s));
+        controlSuccs.put(n, Collections.singletonList(s));
         n.isCFG = true;
         // Update predecessor node p.
         p.succs.remove(s);
         p.succs.add(n);
-        controlSuccs.put(p, Arrays.asList(n));
+        controlSuccs.put(p, Collections.singletonList(n));
         // Update successor node s.
         Collections.replaceAll(s.preds, p, n);
         return n;
@@ -373,9 +367,7 @@ public class ServerCompilerScheduler implements Scheduler {
         }
     }
 
-    private static final Comparator<Node> schedulePriority = new Comparator<Node>(){
+    private static final Comparator<Node> schedulePriority = (n1, n2) -> {
-            @Override
-            public int compare(Node n1, Node n2) {
         // Order by rank, then idx.
         int r1 = n1.rank, r2 = n2.rank;
         int o1, o2;
@@ -388,15 +380,14 @@ public class ServerCompilerScheduler implements Scheduler {
         }
         return Integer.compare(o1, o2);
     };
-        };
 
     private List<InputNode> scheduleBlock(Collection<Node> nodes) {
-        List<InputNode> schedule = new ArrayList<InputNode>();
+        List<InputNode> schedule = new ArrayList<>();
 
         // Initialize ready priority queue with nodes without predecessors.
-        Queue<Node> ready = new PriorityQueue<Node>(schedulePriority);
+        Queue<Node> ready = new PriorityQueue<>(schedulePriority);
         // Set of nodes that have been enqueued.
-        Set<Node> visited = new HashSet<Node>(nodes.size());
+        Set<Node> visited = new HashSet<>(nodes.size());
         for (Node n : nodes) {
             if (n.preds.isEmpty()) {
                 ready.add(n);
@@ -712,9 +703,7 @@ public class ServerCompilerScheduler implements Scheduler {
     // Find all nodes reachable in backward traversal from root.
     private Set<Node> reachableNodes() {
         Node root = findRoot();
-        if (root == null) {
+        assert root != null : "No root found!";
-            assert false : "No root found!";
-        }
         Set<Node> reachable = new HashSet<>();
         reachable.add(root);
         Stack<Node> stack = new Stack<>();
@@ -753,7 +742,7 @@ public class ServerCompilerScheduler implements Scheduler {
 
             int to = e.getTo();
             if (!edgeMap.containsKey(to)) {
-                edgeMap.put(to, new ArrayList<InputEdge>());
+                edgeMap.put(to, new ArrayList<>());
             }
 
 
@@ -862,7 +851,7 @@ public class ServerCompilerScheduler implements Scheduler {
             }
             for (String warning : n.warnings) {
                 if (!nodesPerWarning.containsKey(warning)) {
-                    nodesPerWarning.put(warning, new HashSet<Node>());
+                    nodesPerWarning.put(warning, new HashSet<>());
                 }
                 nodesPerWarning.get(warning).add(n);
             }

src/utils/IdealGraphVisualizer/Settings/src/main/java/com/sun/hotspot/igv/settings/Settings.java

@@ -47,9 +47,7 @@ public class Settings {
     public static final String DEFAULT_VIEW = "defaultView";
     public static final int    DEFAULT_VIEW_DEFAULT = DefaultView.SEA_OF_NODES;
     public static final String PORT = "port";
-    public static final String PORT_BINARY = "portBinary";
     public static final String PORT_DEFAULT = "4444";
-    public static final String PORT_BINARY_DEFAULT = "4445";
     public static final String DIRECTORY = "directory";
     public static final String DIRECTORY_DEFAULT = System.getProperty("user.dir");
 

src/utils/IdealGraphVisualizer/Util/src/main/java/com/sun/hotspot/igv/util/DoubleClickAction.java

@@ -32,7 +32,7 @@ import org.netbeans.api.visual.widget.Widget;
  */
 public class DoubleClickAction extends WidgetAction.Adapter {
 
-    private DoubleClickHandler handler;
+    private final DoubleClickHandler handler;
 
     public DoubleClickAction(DoubleClickHandler handler) {
         this.handler = handler;

src/utils/IdealGraphVisualizer/Util/src/main/java/com/sun/hotspot/igv/util/DoubleClickHandler.java

@@ -32,5 +32,5 @@ import org.netbeans.api.visual.widget.Widget;
  */
 public interface DoubleClickHandler {
 
-    public void handleDoubleClick(Widget w, WidgetMouseEvent e);
+    void handleDoubleClick(Widget w, WidgetMouseEvent e);
 }

src/utils/IdealGraphVisualizer/Util/src/main/java/com/sun/hotspot/igv/util/ExtendedSatelliteComponent.java

@@ -1,208 +0,0 @@
-/*
- * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- *
- */
-package com.sun.hotspot.igv.util;
-
-import java.awt.*;
-import java.awt.event.*;
-import javax.swing.JComponent;
-import org.netbeans.api.visual.widget.Scene;
-
-/**
- * @author David Kaspar
- * @author Thomas Wuerthinger
- */
-public class ExtendedSatelliteComponent extends JComponent implements MouseListener, MouseMotionListener, Scene.SceneListener, ComponentListener {
-
-    private Scene scene;
-    private Image image;
-    private int imageWidth;
-    private int imageHeight;
-
-    public ExtendedSatelliteComponent(Scene scene) {
-        this.scene = scene;
-        setDoubleBuffered(true);
-        setPreferredSize(new Dimension(128, 128));
-        addMouseListener(this);
-        addMouseMotionListener(this);
-    }
-
-    @Override
-    public void addNotify() {
-        super.addNotify();
-        scene.addSceneListener(this);
-        JComponent viewComponent = scene.getView();
-        if (viewComponent == null) {
-            viewComponent = scene.createView();
-        }
-        viewComponent.addComponentListener(this);
-        repaint();
-    }
-
-    @Override
-    public void removeNotify() {
-        scene.getView().removeComponentListener(this);
-        scene.removeSceneListener(this);
-        super.removeNotify();
-    }
-
-    public void update() {
-        this.image = null;
-        repaint();
-    }
-
-    @Override
-    public void paint(Graphics g) {
-        Graphics2D gr = (Graphics2D) g;
-        super.paint(g);
-        Rectangle bounds = scene.getBounds();
-        Dimension size = getSize();
-
-        double sx = bounds.width > 0 ? (double) size.width / bounds.width : 0.0;
-        double sy = bounds.width > 0 ? (double) size.height / bounds.height : 0.0;
-        double scale = Math.min(sx, sy);
-
-        int vw = (int) (scale * bounds.width);
-        int vh = (int) (scale * bounds.height);
-        int vx = (size.width - vw) / 2;
-        int vy = (size.height - vh) / 2;
-
-
-        if (image == null || vw != imageWidth || vh != imageHeight) {
-
-            imageWidth = vw;
-            imageHeight = vh;
-            image = this.createImage(imageWidth, imageHeight);
-            Graphics2D ig = (Graphics2D) image.getGraphics();
-            ig.scale(scale, scale);
-            scene.paint(ig);
-        }
-
-        gr.drawImage(image, vx, vy, this);
-
-        JComponent component = scene.getView();
-        double zoomFactor = scene.getZoomFactor();
-        Rectangle viewRectangle = component != null ? component.getVisibleRect() : null;
-        if (viewRectangle != null) {
-            Rectangle window = new Rectangle(
-                    (int) ((double) viewRectangle.x * scale / zoomFactor),
-                    (int) ((double) viewRectangle.y * scale / zoomFactor),
-                    (int) ((double) viewRectangle.width * scale / zoomFactor),
-                    (int) ((double) viewRectangle.height * scale / zoomFactor));
-            window.translate(vx, vy);
-            gr.setColor(new Color(200, 200, 200, 128));
-            gr.fill(window);
-            gr.setColor(Color.BLACK);
-            gr.drawRect(window.x, window.y, window.width - 1, window.height - 1);
-        }
-    }
-
-    @Override
-    public void mouseClicked(MouseEvent e) {
-    }
-
-    @Override
-    public void mousePressed(MouseEvent e) {
-        moveVisibleRect(e.getPoint());
-    }
-
-    @Override
-    public void mouseReleased(MouseEvent e) {
-        moveVisibleRect(e.getPoint());
-    }
-
-    @Override
-    public void mouseEntered(MouseEvent e) {
-    }
-
-    @Override
-    public void mouseExited(MouseEvent e) {
-    }
-
-    @Override
-    public void mouseDragged(MouseEvent e) {
-        moveVisibleRect(e.getPoint());
-    }
-
-    @Override
-    public void mouseMoved(MouseEvent e) {
-    }
-
-    private void moveVisibleRect(Point center) {
-        JComponent component = scene.getView();
-        if (component == null) {
-            return;
-        }
-        double zoomFactor = scene.getZoomFactor();
-        Rectangle bounds = scene.getBounds();
-        Dimension size = getSize();
-
-        double sx = bounds.width > 0 ? (double) size.width / bounds.width : 0.0;
-        double sy = bounds.width > 0 ? (double) size.height / bounds.height : 0.0;
-        double scale = Math.min(sx, sy);
-
-        int vw = (int) (scale * bounds.width);
-        int vh = (int) (scale * bounds.height);
-        int vx = (size.width - vw) / 2;
-        int vy = (size.height - vh) / 2;
-
-        int cx = (int) ((double) (center.x - vx) / scale * zoomFactor);
-        int cy = (int) ((double) (center.y - vy) / scale * zoomFactor);
-
-        Rectangle visibleRect = component.getVisibleRect();
-        visibleRect.x = cx - visibleRect.width / 2;
-        visibleRect.y = cy - visibleRect.height / 2;
-        component.scrollRectToVisible(visibleRect);
-
-    }
-
-    @Override
-    public void sceneRepaint() {
-    }
-
-    @Override
-    public void sceneValidating() {
-    }
-
-    @Override
-    public void sceneValidated() {
-    }
-
-    @Override
-    public void componentResized(ComponentEvent e) {
-        repaint();
-    }
-
-    @Override
-    public void componentMoved(ComponentEvent e) {
-        repaint();
-    }
-
-    @Override
-    public void componentShown(ComponentEvent e) {
-    }
-
-    @Override
-    public void componentHidden(ComponentEvent e) {
-    }
-}

src/utils/IdealGraphVisualizer/Util/src/main/java/com/sun/hotspot/igv/util/LookupHistory.java

@@ -38,12 +38,12 @@ import org.openide.util.Utilities;
  */
 public class LookupHistory {
 
-    private static Map<Class, LookupHistoryImpl> cache = new HashMap<>();
+    private static final Map<Class, LookupHistoryImpl> cache = new HashMap<>();
 
     private static class LookupHistoryImpl<T> extends Event<ChangedListener<T>> implements LookupListener {
 
-        private Class<T> klass;
+        private final Class<T> klass;
-        private Result<T> result;
+        private final Result<T> result;
         private T last;
 
         public LookupHistoryImpl(Class<T> klass) {

src/utils/IdealGraphVisualizer/Util/src/main/java/com/sun/hotspot/igv/util/PropertiesConverter.java

@@ -26,7 +26,6 @@ package com.sun.hotspot.igv.util;
 
 import com.sun.hotspot.igv.data.Properties;
 import com.sun.hotspot.igv.data.Property;
-import com.sun.hotspot.igv.util.StringUtils;
 
 /**
  *

src/utils/IdealGraphVisualizer/Util/src/main/java/com/sun/hotspot/igv/util/PropertiesSheet.java

@@ -26,7 +26,6 @@ package com.sun.hotspot.igv.util;
 
 import com.sun.hotspot.igv.data.Properties;
 import com.sun.hotspot.igv.data.Property;
-import java.lang.reflect.InvocationTargetException;
 import org.openide.nodes.Node;
 import org.openide.nodes.Sheet;
 
@@ -49,7 +48,7 @@ public class PropertiesSheet {
                 }
 
                 @Override
-                public String getValue() throws IllegalAccessException, InvocationTargetException {
+                public String getValue() {
                     return p.getValue();
                 }
 
@@ -59,7 +58,7 @@ public class PropertiesSheet {
                 }
 
                 @Override
-                public void setValue(String arg0) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException {
+                public void setValue(String arg0) throws IllegalArgumentException {
                     properties.setProperty(p.getName(), arg0);
                 }
             };