8172810: ModuleElement should declare and provide appropriate modifiers

Reviewed-by: darcy

langtools/src/java.compiler/share/classes/javax/lang/model/element/ModuleElement.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2017, 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
@@ -62,6 +62,15 @@ public interface ModuleElement extends Element, QualifiedNameable {
     @Override
     List<? extends Element> getEnclosedElements();
 
+    /**
+     * Returns {@code true} if this is an open module and {@code
+     * false} otherwise.
+     *
+     * @return {@code true} if this is an open module and {@code
+     * false} otherwise
+     */ // TODO: add @jls to unnamed module section
+    boolean isOpen();
+
     /**
      * Returns {@code true} if this is an unnamed module and {@code
      * false} otherwise.

langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/code/Symbol.java

@@ -947,6 +947,11 @@ public abstract class Symbol extends AnnoConstruct implements Element {
             this.type = new ModuleType(this);
         }
 
+        @Override @DefinedBy(Api.LANGUAGE_MODEL)
+        public boolean isOpen() {
+            return flags.contains(ModuleFlags.OPEN);
+        }
+
         @Override @DefinedBy(Api.LANGUAGE_MODEL)
         public boolean isUnnamed() {
             return name.isEmpty() && owner == null;

langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/processing/PrintingProcessor.java

@@ -306,9 +306,9 @@ public class PrintingProcessor extends AbstractProcessor {
             defaultAction(e, false);
 
             if (!e.isUnnamed()) {
-                // TODO: openness of the module not currently exposed
+                if (e.isOpen()) {
-                // by the language model API, but should be printed
+                    writer.print("open ");
-                // here once available.
+                }
                 writer.println("module " + e.getQualifiedName() + " {");
                 indentation++;
                 for (ModuleElement.Directive directive : e.getDirectives()) {