diff -r 000000000000 -r 959103a6100f src/share/classes/com/sun/source/util/SimpleDocTreeVisitor.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/classes/com/sun/source/util/SimpleDocTreeVisitor.java	Wed Apr 27 01:34:52 2016 +0800
@@ -0,0 +1,180 @@
+/*
+ * Copyright (c) 2005, 2013, 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.source.util;
+
+import com.sun.source.doctree.*;
+
+/**
+ * A simple visitor for tree nodes.
+ *
+ * @since 1.8
+ */
+@jdk.Exported
+public class SimpleDocTreeVisitor<R,P> implements DocTreeVisitor<R, P> {
+    protected final R DEFAULT_VALUE;
+
+    protected SimpleDocTreeVisitor() {
+        DEFAULT_VALUE = null;
+    }
+
+    protected SimpleDocTreeVisitor(R defaultValue) {
+        DEFAULT_VALUE = defaultValue;
+    }
+
+    protected R defaultAction(DocTree node, P p) {
+        return DEFAULT_VALUE;
+    }
+
+    public final R visit(DocTree node, P p) {
+        return (node == null) ? null : node.accept(this, p);
+    }
+
+    public final R visit(Iterable<? extends DocTree> nodes, P p) {
+        R r = null;
+        if (nodes != null) {
+            for (DocTree node : nodes)
+                r = visit(node, p);
+        }
+        return r;
+    }
+
+    public R visitAttribute(AttributeTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitAuthor(AuthorTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitComment(CommentTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitDeprecated(DeprecatedTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitDocComment(DocCommentTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitDocRoot(DocRootTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitEndElement(EndElementTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitEntity(EntityTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitErroneous(ErroneousTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitIdentifier(IdentifierTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitInheritDoc(InheritDocTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitLink(LinkTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitLiteral(LiteralTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitParam(ParamTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitReference(ReferenceTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitReturn(ReturnTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitSee(SeeTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitSerial(SerialTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitSerialData(SerialDataTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitSerialField(SerialFieldTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitSince(SinceTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitStartElement(StartElementTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitText(TextTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitThrows(ThrowsTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitUnknownBlockTag(UnknownBlockTagTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitUnknownInlineTag(UnknownInlineTagTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitValue(ValueTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitVersion(VersionTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+    public R visitOther(DocTree node, P p) {
+        return defaultAction(node, p);
+    }
+
+}