001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.camel.impl; 018 019import java.io.IOException; 020import java.net.URL; 021import java.util.Enumeration; 022 023/** 024 * WebSphere specific resolver to handle loading annotated resources in JAR files. 025 */ 026public class WebSpherePackageScanClassResolver extends DefaultPackageScanClassResolver { 027 028 private final String resourcePath; 029 030 /** 031 * Constructor. 032 * 033 * @param resourcePath the fixed resource path to use for fetching camel jars in WebSphere. 034 */ 035 public WebSpherePackageScanClassResolver(String resourcePath) { 036 this.resourcePath = resourcePath; 037 } 038 039 /** 040 * Is the classloader from IBM and thus the WebSphere platform? 041 * 042 * @param loader the classloader 043 * @return <tt>true</tt> if IBM classloader, <tt>false</tt> otherwise. 044 */ 045 public static boolean isWebSphereClassLoader(ClassLoader loader) { 046 return loader != null ? loader.getClass().getName().startsWith("com.ibm.") : false; 047 } 048 049 /** 050 * Overloaded to handle specific problem with getting resources on the IBM WebSphere platform. 051 * <p/> 052 * WebSphere can <b>not</b> load resources if the resource to load is a folder name, such as a 053 * packagename, you have to explicit name a resource that is a file. 054 * 055 * @param loader the classloader 056 * @param packageName the packagename for the package to load 057 * @return URL's for the given package 058 * @throws java.io.IOException is thrown by the classloader 059 */ 060 @Override 061 protected Enumeration<URL> getResources(ClassLoader loader, String packageName) throws IOException { 062 // try super first, just in vase 063 Enumeration<URL> enumeration = super.getResources(loader, packageName); 064 if (!enumeration.hasMoreElements()) { 065 log.trace("Using WebSphere workaround to load the camel jars with the annotated converters."); 066 // Special WebSphere trick to load a file that exists in the JAR and then let it go from there. 067 // The trick is that we just need the URL's for the .jars that contains the type 068 // converters that is annotated. So by searching for this resource WebSphere is able to find 069 // it and return the URL to the .jar file with the resource. Then the DefaultPackageScanClassResolver 070 // can take it from there and find the classes that are annotated. 071 enumeration = loader.getResources(resourcePath); 072 } 073 074 return enumeration; 075 } 076 077}