DOMVisitor.java example

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/*
 * @(#)$Id: DOMVisitor.java,v 1.1 2001/08/02 17:31:33 Bear Exp $
 *
 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */
package com.sun.msv.util.xml;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;

/**
 * visits all DOM elements in the depth-first order (in-order).
 * 
 * @author
 *	<a href="mailto:kohsuke.kawaguchi@sun.com">Kohsuke KAWAGUCHI</a>
 */
public abstract class DOMVisitor
{
	public void visit( Document dom ) {
		visit( dom.getDocumentElement() );
	}
	
	public void visit( Element e ) {
		NodeList lst = e.getChildNodes();
		int len = lst.getLength();
		for( int i=0; i<lst.getLength(); i++ ) {
			Node n = lst.item(i);
			if( n.getNodeType() == n.ELEMENT_NODE )
				visit( (Element)n );
			else
				visitNode( n );
		}
	}
	
	/**
	 * other nodes.
	 */
	public void visitNode( Node n ) {}
}