001/*
002 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and contributors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bstefanescu
018 */
019package org.nuxeo.osgi.application;
020
021import java.lang.reflect.InvocationTargetException;
022import java.lang.reflect.Method;
023import java.net.URL;
024import java.net.URLClassLoader;
025
026/**
027 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
028 */
029public class DelegateLoader implements SharedClassLoader {
030
031    protected final URLClassLoader loader;
032
033    protected Method addUrl;
034
035    public DelegateLoader(URLClassLoader loader) {
036        this.loader = loader;
037        try {
038            addUrl = loader.getClass().getDeclaredMethod("addURL", URL.class);
039            addUrl.setAccessible(true);
040        } catch (SecurityException e) {
041            throw new RuntimeException("Failed to create a shared delegate loader for classloader: " + loader, e);
042        } catch (NoSuchMethodException e) {
043            throw new RuntimeException("Failed to create a shared delegate loader for classloader: " + loader, e);
044        }
045    }
046
047    @Override
048    public void addURL(URL url) {
049        try {
050            addUrl.invoke(loader, url);
051        } catch (IllegalAccessException e) {
052            throw new RuntimeException("Failed to add an URL to this loader: " + url, e);
053        } catch (InvocationTargetException e) {
054            throw new RuntimeException("Failed to add an URL to this loader: " + url, e);
055        }
056    }
057
058    @Override
059    public URL[] getURLs() {
060        return loader.getURLs();
061    }
062
063    @Override
064    public ClassLoader getLoader() {
065        return loader;
066    }
067
068}