| /** |
| * 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.s4.base.util; |
| |
| import java.io.Closeable; |
| import java.io.File; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| import java.security.CodeSource; |
| import java.security.ProtectionDomain; |
| import java.util.Enumeration; |
| import java.util.jar.JarEntry; |
| import java.util.jar.JarFile; |
| |
| /** |
| * Our goal is to be able to put apps and dependent classes in a single jar that |
| * we can easily read using a URL. |
| * |
| * With derived work from <a href= |
| * "http://qdolan.blogspot.com/2008/10/embedded-jar-classloader-in-under-100.html" |
| * >this blog</a>. |
| * |
| * @author Leo Neumeyer |
| * |
| */ |
| public class JarClassLoader extends URLClassLoader { |
| |
| private static void close(Closeable closeable) { |
| if (closeable != null) { |
| try { |
| closeable.close(); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } |
| } |
| } |
| |
| private static boolean isJar(String fileName) { |
| return fileName != null && fileName.toLowerCase().endsWith(".jar"); |
| } |
| |
| private static File jarEntryAsFile(JarFile jarFile, JarEntry jarEntry) throws IOException { |
| InputStream input = null; |
| OutputStream output = null; |
| try { |
| String name = jarEntry.getName().replace('/', '_'); |
| int i = name.lastIndexOf("."); |
| String extension = i > -1 ? name.substring(i) : ""; |
| File file = File.createTempFile(name.substring(0, name.length() - extension.length()) + ".", extension); |
| file.deleteOnExit(); |
| input = jarFile.getInputStream(jarEntry); |
| output = new FileOutputStream(file); |
| int readCount; |
| byte[] buffer = new byte[4096]; |
| while ((readCount = input.read(buffer)) != -1) { |
| output.write(buffer, 0, readCount); |
| } |
| return file; |
| } finally { |
| close(input); |
| close(output); |
| } |
| } |
| |
| public JarClassLoader(URL[] urls, ClassLoader parent) { |
| super(urls, parent); |
| try { |
| ProtectionDomain protectionDomain = getClass().getProtectionDomain(); |
| CodeSource codeSource = protectionDomain.getCodeSource(); |
| URL rootJarUrl = codeSource.getLocation(); |
| String rootJarName = rootJarUrl.getFile(); |
| if (isJar(rootJarName)) { |
| addJarResource(new File(rootJarUrl.getPath())); |
| } |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } |
| } |
| |
| private void addJarResource(File file) throws IOException { |
| JarFile jarFile = new JarFile(file); |
| addURL(file.toURI().toURL()); |
| Enumeration<JarEntry> jarEntries = jarFile.entries(); |
| while (jarEntries.hasMoreElements()) { |
| JarEntry jarEntry = jarEntries.nextElement(); |
| if (!jarEntry.isDirectory() && isJar(jarEntry.getName())) { |
| addJarResource(jarEntryAsFile(jarFile, jarEntry)); |
| } |
| } |
| } |
| |
| @Override |
| protected synchronized Class<?> loadClass(String name, boolean resolve) |
| throws ClassNotFoundException { |
| try { |
| Class<?> clazz = findLoadedClass(name); |
| if (clazz == null) { |
| clazz = findClass(name); |
| if (resolve) |
| resolveClass(clazz); |
| } |
| return clazz; |
| } catch (ClassNotFoundException e) { |
| return super.loadClass(name, resolve); |
| } |
| } |
| } |