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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.xbean.classloader;

import java.net.URL;
import java.net.URLClassLoader;
import java.net.URLStreamHandlerFactory;
import java.util.Arrays;

/**
 * The NamedClassLoader is a simple extension to URLClassLoader that adds a name and a destroy method that cleans up the
 * commons logging and JavaVM caches of the classloader.
 * 
 * @author Dain Sundstrom
 */
public class NamedClassLoader extends URLClassLoader implements DestroyableClassLoader {

	private final String name;
	private volatile boolean destroyed = false;

	/**
	 * Creates a named class loader with no parents.
	 * @param name the name of this class loader
	 * @param urls the urls from which this class loader will classes and resources
	 */
	public NamedClassLoader(String name, URL[] urls) {
		super(urls);
		this.name = name;
	}

	/**
	 * Creates a named class loader as a child of the specified parent.
	 * @param name the name of this class loader
	 * @param urls the urls from which this class loader will classes and resources
	 * @param parent the parent of this class loader
	 */
	public NamedClassLoader(String name, URL[] urls, ClassLoader parent) {
		super(urls, parent);
		this.name = name;
	}

	/**
	 * Creates a named class loader as a child of the specified parent and using the specified URLStreamHandlerFactory
	 * for accessing the urls..
	 * @param name the name of this class loader
	 * @param urls the urls from which this class loader will classes and resources
	 * @param parent the parent of this class loader
	 * @param factory the URLStreamHandlerFactory used to access the urls
	 */
	public NamedClassLoader(String name, URL[] urls, ClassLoader parent, URLStreamHandlerFactory factory) {
		super(urls, parent, factory);
		this.name = name;
	}

	/**
	 * Check if this classloader has been destroyed
	 * @return true if the classloader has been destroyed
	 */
	public boolean isDestroyed() {
		return destroyed;
	}

	/**
	 * {@inheritDoc}
	 */
	public void destroy() {
		synchronized (this) {
			if (destroyed)
				return;
			destroyed = true;
		}
		ClassLoaderUtil.destroy(this);
	}

	/**
	 * Gets the name of this class loader.
	 * @return the name of this class loader
	 */
	public String getName() {
		return name;
	}

	/**
	 * {@inheritDoc}
	 */
	public String toString() {
		return "[" + getClass().getName() + ":" + " name=" + getName() + " urls=" + Arrays.asList(getURLs()) + "]";
	}
}