| /** |
| * 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.camel.core.osgi.utils; |
| |
| import java.io.IOException; |
| import java.net.URL; |
| import java.util.Enumeration; |
| |
| import org.osgi.framework.Bundle; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A ClassLoader delegating to a given OSGi bundle. |
| * |
| */ |
| public class BundleDelegatingClassLoader extends ClassLoader { |
| private static final transient Logger LOG = LoggerFactory.getLogger(BundleDelegatingClassLoader.class); |
| private final Bundle bundle; |
| private final ClassLoader classLoader; |
| |
| public BundleDelegatingClassLoader(Bundle bundle) { |
| this(bundle, null); |
| } |
| |
| public BundleDelegatingClassLoader(Bundle bundle, ClassLoader classLoader) { |
| this.bundle = bundle; |
| this.classLoader = classLoader; |
| } |
| |
| protected Class<?> findClass(String name) throws ClassNotFoundException { |
| if (LOG.isTraceEnabled()) { |
| LOG.trace("FindClass: " + name); |
| } |
| return bundle.loadClass(name); |
| } |
| |
| protected URL findResource(String name) { |
| if (LOG.isTraceEnabled()) { |
| LOG.trace("FindResource: " + name); |
| } |
| URL resource = bundle.getResource(name); |
| if (classLoader != null && resource == null) { |
| resource = classLoader.getResource(name); |
| } |
| return resource; |
| } |
| |
| @SuppressWarnings("unchecked") |
| protected Enumeration findResources(String name) throws IOException { |
| if (LOG.isTraceEnabled()) { |
| LOG.trace("FindResource: " + name); |
| } |
| return bundle.getResources(name); |
| } |
| |
| protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException { |
| if (LOG.isTraceEnabled()) { |
| LOG.trace("LoadClass: " + name + ", resolve: " + resolve); |
| } |
| Class clazz; |
| try { |
| clazz = findClass(name); |
| } catch (ClassNotFoundException cnfe) { |
| if (classLoader != null) { |
| try { |
| clazz = classLoader.loadClass(name); |
| } catch (ClassNotFoundException e) { |
| throw new ClassNotFoundException(name + " from bundle " + bundle.getBundleId() + " (" + bundle.getSymbolicName() + ")", cnfe); |
| } |
| } else { |
| throw new ClassNotFoundException(name + " from bundle " + bundle.getBundleId() + " (" + bundle.getSymbolicName() + ")", cnfe); |
| } |
| } |
| if (resolve) { |
| resolveClass(clazz); |
| } |
| return clazz; |
| } |
| |
| public Bundle getBundle() { |
| return bundle; |
| } |
| } |