8005046: Provide checking for a default method in javax.lang.model

Reviewed-by: jjg

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

@@ -1353,7 +1353,7 @@ public abstract class Symbol implements Element {
             return defaultValue;
         }
 
-        public List<VarSymbol> getParameters() {
+         public List<VarSymbol> getParameters() {
             return params();
         }
 
@@ -1361,6 +1361,10 @@ public abstract class Symbol implements Element {
             return (flags() & VARARGS) != 0;
         }
 
+        public boolean isDefault() {
+            return (flags() & DEFAULT) != 0;
+        }
+
         public <R, P> R accept(ElementVisitor<R, P> v, P p) {
             return v.visitExecutable(this, p);
         }

langtools/src/share/classes/javax/lang/model/element/ExecutableElement.java

@@ -77,6 +77,16 @@ public interface ExecutableElement extends Element, Parameterizable {
      */
     boolean isVarArgs();
 
+    /**
+     * Returns {@code true} if this method is a default method and
+     * returns {@code false} otherwise.
+     *
+     * @return {@code true} if this method is a default method and
+     * {@code false} otherwise
+     * @since 1.8
+     */
+    boolean isDefault();
+
     /**
      * Returns the exceptions and other throwables listed in this
      * method or constructor's {@code throws} clause in declaration

langtools/test/tools/javac/processing/model/element/TestExecutableElement.java

@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2012, 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.
+ */
+
+/*
+ * @test
+ * @bug 8005046
+ * @summary Test basic properties of javax.lang.element.Element
+ * @author  Joseph D. Darcy
+ * @library /tools/javac/lib
+ * @build   JavacTestingAbstractProcessor TestExecutableElement
+ * @compile -processor TestExecutableElement -proc:only TestExecutableElement.java
+ */
+
+import java.lang.annotation.*;
+import java.util.Formatter;
+import java.util.Set;
+import java.util.Objects;
+import javax.annotation.processing.*;
+import javax.lang.model.SourceVersion;
+import static javax.lang.model.SourceVersion.*;
+import javax.lang.model.element.*;
+import javax.lang.model.util.*;
+import static javax.lang.model.util.ElementFilter.*;
+import static javax.tools.Diagnostic.Kind.*;
+import static javax.tools.StandardLocation.*;
+
+/**
+ * Test some basic workings of javax.lang.element.ExecutableElement
+ */
+public class TestExecutableElement extends JavacTestingAbstractProcessor implements ProviderOfDefault {
+    @IsDefault(false)
+    public boolean process(Set<? extends TypeElement> annotations,
+                           RoundEnvironment roundEnv) {
+        int errors = 0;
+        if (!roundEnv.processingOver()) {
+            boolean hasRun = false;
+            for (Element element : roundEnv.getRootElements()) {
+                for (ExecutableElement method : methodsIn(element.getEnclosedElements())) {
+                    hasRun = true;
+                    errors += checkIsDefault(method);
+                }
+            }
+
+            if (!hasRun) {
+                messager.printMessage(ERROR, "No test cases run; test fails.");
+            }
+        }
+        return true;
+    }
+
+    @IsDefault(false)
+    int checkIsDefault(ExecutableElement method) {
+        System.out.println("Testing " + method);
+        IsDefault expectedIsDefault = method.getAnnotation(IsDefault.class);
+
+        boolean expectedDefault = (expectedIsDefault != null) ?
+            expectedIsDefault.value() :
+            false;
+
+        boolean methodIsDefault = method.isDefault();
+
+        if (methodIsDefault != expectedDefault) {
+            messager.printMessage(ERROR,
+                                  new Formatter().format("Unexpected Executable.isDefault result: got %s, expected %s",
+                                                         expectedDefault,
+                                                         methodIsDefault).toString(),
+                                  method);
+            return 1;
+        }
+        return 0;
+    }
+}
+
+/**
+ * Expected value of the ExecutableElement.isDefault method.
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+@interface IsDefault {
+    boolean value();
+}
+
+/**
+ * Test interface to provide a default method.
+ */
+interface ProviderOfDefault {
+    @IsDefault(false)
+    boolean process(Set<? extends TypeElement> annotations,
+                    RoundEnvironment roundEnv);
+
+    @IsDefault(true)
+    default void quux() {};
+}