--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/make/tools/crules/DefinedByAnalyzer.java	Wed Aug 27 07:44:00 2014 +0200
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2014, 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 crules;
+
+import com.sun.source.util.JavacTask;
+import com.sun.source.util.TaskEvent.Kind;
+import com.sun.tools.javac.code.Symbol;
+import com.sun.tools.javac.code.Symbol.MethodSymbol;
+import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
+import com.sun.tools.javac.tree.TreeScanner;
+import com.sun.tools.javac.util.DefinedBy;
+import com.sun.tools.javac.util.DefinedBy.Api;
+
+/**This analyzer ensures that all method that implement a public supported API method are marked with
+ * {@link DefinedBy} annotation, and that methods that don't implement a public API are not marked
+ * using the annotation.
+ */
+public class DefinedByAnalyzer extends AbstractCodingRulesAnalyzer {
+
+    public DefinedByAnalyzer(JavacTask task) {
+        super(task);
+        treeVisitor = new DefinedByVisitor();
+        eventKind = Kind.ANALYZE;
+    }
+
+    class DefinedByVisitor extends TreeScanner {
+        @Override
+        public void visitMethodDef(JCMethodDecl tree) {
+            if (!isAPIPackage(packageName(tree.sym))) {
+                boolean seenAPIPackage = false;
+
+                for (MethodSymbol overridden : types.getOverriddenMethods(tree.sym)) {
+                    String overriddenPackage = packageName(overridden);
+
+                    if (!isAPIPackage(overriddenPackage))
+                        continue;
+
+                    seenAPIPackage = true;
+
+                    DefinedBy definedBy = tree.sym.getAnnotation(DefinedBy.class);
+
+                    if (definedBy != null) {
+                        String packageRoot = definedBy.value().packageRoot;
+                        if (!overriddenPackage.startsWith(packageRoot)) {
+                            messages.error(tree, "crules.wrong.defined.by");
+                        }
+                        continue;
+                    }
+
+                    messages.error(tree, "crules.no.defined.by");
+                }
+
+                if (!seenAPIPackage && tree.sym.getAnnotation(DefinedBy.class) != null) {
+                    messages.error(tree, "crules.defined.by.no.api");
+                }
+            }
+
+            super.visitMethodDef(tree);
+        }
+
+        private boolean isAPIPackage(String pack) {
+            for (Api api : Api.values()) {
+                if (pack.startsWith(api.packageRoot))
+                    return true;
+            }
+
+            return false;
+        }
+
+        private String packageName(Symbol sym) {
+            return elements.getPackageOf(sym).getQualifiedName().toString();
+        }
+    }
+}