diff -r 000000000000 -r 959103a6100f src/share/classes/com/sun/tools/doclets/formats/html/markup/ContentBuilder.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/classes/com/sun/tools/doclets/formats/html/markup/ContentBuilder.java	Wed Apr 27 01:34:52 2016 +0800
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2003, 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.tools.doclets.formats.html.markup;
+
+import java.io.IOException;
+import java.io.Writer;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import com.sun.tools.doclets.internal.toolkit.Content;
+
+/**
+ * A sequence of Content nodes.
+ */
+public class ContentBuilder extends Content {
+    protected List<Content> contents = Collections.<Content>emptyList();
+
+    @Override
+    public void addContent(Content content) {
+        nullCheck(content);
+        ensureMutableContents();
+        if (content instanceof ContentBuilder) {
+            contents.addAll(((ContentBuilder) content).contents);
+        } else
+            contents.add(content);
+    }
+
+    @Override
+    public void addContent(String text) {
+        if (text.isEmpty())
+            return;
+        ensureMutableContents();
+        Content c = contents.isEmpty() ? null : contents.get(contents.size() - 1);
+        StringContent sc;
+        if (c != null && c instanceof StringContent) {
+            sc = (StringContent) c;
+        } else {
+            contents.add(sc = new StringContent());
+        }
+        sc.addContent(text);
+    }
+
+    @Override
+    public boolean write(Writer writer, boolean atNewline) throws IOException {
+        for (Content content: contents) {
+            atNewline = content.write(writer, atNewline);
+        }
+        return atNewline;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        for (Content content: contents) {
+            if (!content.isEmpty())
+                return false;
+        }
+        return true;
+    }
+
+    @Override
+    public int charCount() {
+        int n = 0;
+        for (Content c : contents)
+            n += c.charCount();
+        return n;
+    }
+
+    private void ensureMutableContents() {
+        if (contents.isEmpty())
+            contents = new ArrayList<Content>();
+    }
+}