| /* |
| * 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.guacamole.extension; |
| |
| import java.io.File; |
| import java.io.FilenameFilter; |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import org.apache.guacamole.GuacamoleException; |
| |
| /** |
| * A ClassLoader implementation which finds classes within .jar files within a |
| * given directory. |
| */ |
| public class DirectoryClassLoader extends URLClassLoader { |
| |
| /** |
| * Returns all .jar files within the given directory as an array of URLs. |
| * |
| * @param dir |
| * The directory to retrieve all .jar files from. |
| * |
| * @return |
| * An array of the URLs of all .jar files within the given directory. |
| * |
| * @throws GuacamoleException |
| * If the given file is not a directory, or the contents of the given |
| * directory cannot be read. |
| */ |
| private static URL[] getJarURLs(File dir) throws GuacamoleException { |
| |
| // Validate directory is indeed a directory |
| if (!dir.isDirectory()) |
| throw new GuacamoleException(dir + " is not a directory."); |
| |
| // Get list of URLs for all .jar's in the lib directory |
| Collection<URL> jarURLs = new ArrayList<URL>(); |
| File[] files = dir.listFiles(new FilenameFilter() { |
| |
| @Override |
| public boolean accept(File dir, String name) { |
| |
| // If it ends with .jar, accept the file |
| return name.endsWith(".jar"); |
| |
| } |
| |
| }); |
| |
| // Verify directory was successfully read |
| if (files == null) |
| throw new GuacamoleException("Unable to read contents of directory " + dir); |
| |
| // Add the URL for each .jar to the jar URL list |
| for (File file : files) { |
| |
| try { |
| jarURLs.add(file.toURI().toURL()); |
| } |
| catch (MalformedURLException e) { |
| throw new GuacamoleException(e); |
| } |
| |
| } |
| |
| // Set delegate classloader to new URLClassLoader which loads from the .jars found above. |
| URL[] urls = new URL[jarURLs.size()]; |
| return jarURLs.toArray(urls); |
| |
| } |
| |
| /** |
| * Creates a new DirectoryClassLoader configured to load .jar files from |
| * the given directory. |
| * |
| * @param dir |
| * The directory from which .jar files should be read. |
| * |
| * @throws GuacamoleException |
| * If the given file is not a directory, or the contents of the given |
| * directory cannot be read. |
| */ |
| |
| public DirectoryClassLoader(File dir) throws GuacamoleException { |
| super(getJarURLs(dir), DirectoryClassLoader.class.getClassLoader()); |
| } |
| |
| } |