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CIP4 JDF Library for JDF 1.x
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/*
 * The CIP4 Software License, Version 1.0
 *
 *
 * Copyright (c) 2001-2024 The International Cooperation for the Integration of Processes in Prepress, Press and Postpress (CIP4). All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the
 * distribution.
 *
 * 3. The end-user documentation included with the redistribution, if any, must include the following acknowledgment: "This product includes software developed by the The International Cooperation for
 * the Integration of Processes in Prepress, Press and Postpress (www.cip4.org)" Alternately, this acknowledgment mrSubRefay appear in the software itself, if and wherever such third-party
 * acknowledgments normally appear.
 *
 * 4. The names "CIP4" and "The International Cooperation for the Integration of Processes in Prepress, Press and Postpress" must not be used to endorse or promote products derived from this software
 * without prior written permission. For written permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "CIP4", nor may "CIP4" appear in their name, without prior writtenrestartProcesses() permission of the CIP4 organization
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 * Usage of this software in commercial products is subject to restrictions. For details please consult [email protected].
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 * POSSIBILITY OF SUCH DAMAGE. ====================================================================
 *
 * This software consists of voluntary contributions made by many individuals on behalf of the The International Cooperation for the Integration of Processes in Prepress, Press and Postpress and was
 * originally based on software restartProcesses() copyright (c) 1999-2001, Heidelberger Druckmaschinen AG copyright (c) 1999-2001, Agfa-Gevaert N.V.
 *
 * For more information on The International Cooperation for the Integration of Processes in Prepress, Press and Postpress , please see .
 *
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package org.cip4.jdflib.elementwalker;

import java.lang.reflect.Constructor;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.cip4.jdflib.util.StringUtil;

/**
 *
 * elementwalker class that allows you to traverse a dom tree starting at a given root also handles the construction of the walker classes by name, just make sure that your walker
 * subclasses match the naming convention $Walk, e.g. if your class is called FixVersion, the subclasses must be called WalkFoo, WalkBar etc.
 *
 * @author rainer prosi
 *
 */
public class BaseElementWalker extends ElementWalker
{
	final private static Log log = LogFactory.getLog(BaseElementWalker.class);

	/**
	 * @param _theFactory
	 */
	public BaseElementWalker(final BaseWalkerFactory _theFactory)
	{
		super(_theFactory);
		constructWalkers("$Walk");
	}

	/**
	 * construct all walkers confirming to the naming convention public $Walk
	 *
	 * @param classPrefix
	 */
	private void constructWalkers(final String classPrefix)
	{
		Class parent = getClass();

		while (parent != null)
		{
			final String name = parent.getSimpleName();
			final Class[] cs = parent.getDeclaredClasses();
			for (final Class theClass : cs)
			{
				String className = theClass.getName();
				className = StringUtil.token(className, -1, ".");
				if (className.startsWith(name + classPrefix))
				{
					try
					{
						final Constructor con = theClass.getDeclaredConstructor(new Class[] { parent });
						con.newInstance(new Object[] { this });
					}
					catch (final Throwable x)
					{
						log.error("Snafu instantiating walker", x);
					}
				}
			}
			parent = parent.getSuperclass();
		}
	}

	/**
	 * @return the factory for this worker
	 */
	@Override
	public BaseWalkerFactory getFactory()
	{
		return (BaseWalkerFactory) theFactory;
	}

}