001 /** 002 * Copyright (c) 2010 Yahoo! Inc. All rights reserved. 003 * Licensed under the Apache License, Version 2.0 (the "License"); 004 * you may not use this file except in compliance with the License. 005 * You may obtain a copy of the License at 006 * 007 * http://www.apache.org/licenses/LICENSE-2.0 008 * 009 * Unless required by applicable law or agreed to in writing, software 010 * distributed under the License is distributed on an "AS IS" BASIS, 011 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 * See the License for the specific language governing permissions and 013 * limitations under the License. See accompanying LICENSE file. 014 */ 015 package org.apache.oozie.util; 016 017 import java.util.Enumeration; 018 import java.net.URL; 019 import java.net.URLDecoder; 020 import java.io.IOException; 021 022 /** 023 * Class utilities. 024 */ 025 public class ClassUtils { 026 027 /** 028 * Return the path to the JAR file in the classpath containing the specified class. <p/> This method has been 029 * canibalized from Hadoop's JobConf class. 030 * 031 * @param clazz class to find its JAR file. 032 * @return the JAR file of the class. 033 */ 034 public static String findContainingJar(Class clazz) { 035 ClassLoader loader = clazz.getClassLoader(); 036 String class_file = clazz.getName().replaceAll("\\.", "/") + ".class"; 037 try { 038 for (Enumeration itr = loader.getResources(class_file); itr.hasMoreElements();) { 039 URL url = (URL) itr.nextElement(); 040 if ("jar".equals(url.getProtocol())) { 041 String toReturn = url.getPath(); 042 if (toReturn.startsWith("file:")) { 043 toReturn = toReturn.substring("file:".length()); 044 } 045 toReturn = URLDecoder.decode(toReturn, "UTF-8"); 046 return toReturn.replaceAll("!.*$", ""); 047 } 048 } 049 } 050 catch (IOException e) { 051 throw new RuntimeException(e); 052 } 053 return null; 054 } 055 056 }