| /* |
| * 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.cocoon.components.classloader; |
| |
| import org.apache.avalon.framework.activity.Disposable; |
| import org.apache.avalon.framework.thread.ThreadSafe; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * A singleton-like implementation of <code>ClassLoaderManager</code> |
| * |
| * @author <a href="mailto:ricardo@apache.org">Ricardo Rocha</a> |
| * @version $Id$ |
| */ |
| public class ClassLoaderManagerImpl implements ClassLoaderManager, ThreadSafe, Disposable { |
| |
| /** |
| * Set of class directories |
| */ |
| protected final Set fileSet = Collections.synchronizedSet(new HashSet()); |
| |
| /** |
| * The class loader instance |
| */ |
| private RepositoryClassLoader instance; |
| |
| /** |
| * A constructor that ensures only a single class loader instance exists |
| */ |
| public ClassLoaderManagerImpl() { |
| reinstantiate(); |
| } |
| |
| public void dispose() { |
| this.fileSet.clear(); |
| reinstantiate(); |
| } |
| |
| /** |
| * Add a directory to the proxied class loader |
| * |
| * @param directoryName The repository name |
| * @throws IOException If the directory is invalid |
| */ |
| public void addDirectory(File directoryName) throws IOException { |
| if (this.fileSet.add(directoryName)) { |
| this.instance.addDirectory(directoryName); |
| } |
| } |
| |
| /** |
| * Load a class through the proxied class loader |
| * |
| * @param className The name of the class to be loaded |
| * @return The loaded class |
| * @throws ClassNotFoundException If the class is not found |
| */ |
| public Class loadClass(String className) throws ClassNotFoundException { |
| return this.instance.loadClass(className); |
| } |
| |
| /** |
| * Reinstantiate the proxied class loader to allow for class reloading |
| */ |
| public void reinstantiate() { |
| if (this.fileSet.isEmpty()) { |
| this.instance = new RepositoryClassLoader(); |
| } else { |
| this.instance = new RepositoryClassLoader(this.fileSet); |
| } |
| } |
| } |