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The JavaHelp API provides a platform-independent help framework.
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/*
 * @(#)AppendMerge.java	1.4 06/10/30
 * 
 * Copyright (c) 2006 Sun Microsystems, Inc.  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.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package javax.help;

import javax.swing.tree.*;
import java.util.*;
import java.text.*;

/**
 * Append merge type
 *
 * @author Richard Gregor
 * @version	1.4	10/30/06
 */
public class AppendMerge extends Merge{

    /**
     * Constructs AppendMerge
     *
     * @param master The master NavigatorView
     * @param slave The slave NavigatorView
     */ 
    public AppendMerge(NavigatorView master, NavigatorView slave){
        super(master,slave);

    }
    
    /**
     * Processes append merge
     *
     * @param node The master node
     * @return Merged master node
     */
    public TreeNode processMerge(TreeNode node){
       debug("start merge");

       mergeNodes(node, slaveTopNode);
       return node;
    }


    /**
     * Merge Nodes. Merge two nodes according to the Append merging rules 
     *
     * @param masterNode The master node to merge with 
     * @param slaveNode The node to merge into the master
     */
    public static void mergeNodes(TreeNode master, TreeNode slave) {
       DefaultMutableTreeNode masterNode = (DefaultMutableTreeNode)master;
       DefaultMutableTreeNode slaveNode = (DefaultMutableTreeNode)slave;
       debug("mergeNodes master=" + MergeHelpUtilities.getNodeName(masterNode) + 
	     " slave=" + MergeHelpUtilities.getNodeName(slaveNode));       
       while (slaveNode.getChildCount() > 0) {
	   DefaultMutableTreeNode slaveNodeChild = 
	       (DefaultMutableTreeNode)slaveNode.getFirstChild();
	   masterNode.add(slaveNodeChild);
	   MergeHelpUtilities.mergeNodeChildren("javax.help.AppendMerge", 
						slaveNodeChild);
       }
    }
    
    /**
     * Merge Node Children. Merge the children of a node according to the
     * Append merging.
     *
     * @param node The parent node from which the children are merged
     */
    public static void mergeNodeChildren(TreeNode node) {
	DefaultMutableTreeNode masterNode = (DefaultMutableTreeNode)node;
	debug("mergeNodes master=" + MergeHelpUtilities.getNodeName(masterNode));
	
	// The rules are there are no rules. Nothing else needs to be done
	// except for merging through the children
	for (int i=0; i < masterNode.getChildCount(); i++) {
	    DefaultMutableTreeNode child = 
		(DefaultMutableTreeNode)masterNode.getChildAt(i);
	    if (!child.isLeaf()) {
		MergeHelpUtilities.mergeNodeChildren("javax.help.AppendMerge",
						     child);
	    }
	}
    }

    private static boolean debug = false;
    private static void debug(String msg){
        if (debug) {
            System.out.println("AppendMerge :"+msg);
	}
    }
}