package org.apache.catalina.loader;

import java.io.File;

import org.apache.catalina.LifecycleException;

/**
 * User configurable web application class loader wrapper
 * <p>
 * This class subclasses the default catalina WebappLoader class
 * and adds the option to set a 'classpath' attribute to the &lt;loader&gt;
 * element of a context definition. 
 * <p>
 * When such an attribute is filled with a list of paths (seperated by the system's
 * path seperator, for example- a colon), then thos paths will be added to the 
 * classloader external repositories.
 * <p>
 * This utility should only be used for developing applications against constantly
 * changing 3rd party APIs, and should not be used for deployment on production 
 * servers.
 * 
 * License: GPL or LGPL or Apache License - take your pick
 *
 * @author Oded Arbel <oded@m-wise.com>
 * @version $Revision$ $Date$
 */
public class ConfigurableWebappClassLoader extends WebappLoader {

	private String m_classpath = null;

	/**
	 * Support all the constructors offered by WebappLoader
	 */
	public ConfigurableWebappClassLoader() {
		super();
	}

	/**
	 * Support all the constructors offered by WebappLoader
	 * @param parent parent class loader
	 */
	public ConfigurableWebappClassLoader(ClassLoader parent) {
		super(parent);

	}

	/**
	 * support the bean property 'classpath'
	 * @param classpath Class path to set
	 */
	public void setClasspath(String classpath) {
		m_classpath = classpath;
	}

	/**
	 * Start the class loader and register my external classpath
	 */
	public void start() throws LifecycleException {
		addConfigurableRepositories();
		super.start();
	}

	private void addConfigurableRepositories() {
		if (m_classpath == null) return;
		
		String[] filepaths = m_classpath.split(File.pathSeparator);
		for (int i = 0; i < filepaths.length; i++) {
			if (!filepaths[i].endsWith(".jar") && !filepaths[i].endsWith("/")) filepaths[i] += "/";
			addRepository("file:" + filepaths[i]);
		}
	}

}