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.InputStream; 020import java.net.URL; 021import java.util.Enumeration; 022 023import org.apache.camel.CamelContext; 024import org.apache.camel.CamelContextAware; 025import org.apache.camel.spi.ClassResolver; 026import org.apache.camel.util.CastUtils; 027import org.apache.camel.util.ObjectHelper; 028 029/** 030 * Default class resolver that uses regular class loader to load classes. 031 */ 032public class DefaultClassResolver implements ClassResolver, CamelContextAware { 033 034 private CamelContext camelContext; 035 036 public DefaultClassResolver() { 037 } 038 039 public DefaultClassResolver(CamelContext camelContext) { 040 this.camelContext = camelContext; 041 } 042 043 public void setCamelContext(CamelContext camelContext) { 044 this.camelContext = camelContext; 045 } 046 047 public CamelContext getCamelContext() { 048 return camelContext; 049 } 050 051 public Class<?> resolveClass(String name) { 052 Class<?> answer = loadClass(name, DefaultClassResolver.class.getClassLoader()); 053 if (answer == null && getApplicationContextClassLoader() != null) { 054 // fallback and use application context class loader 055 answer = loadClass(name, getApplicationContextClassLoader()); 056 } 057 return answer; 058 } 059 060 public <T> Class<T> resolveClass(String name, Class<T> type) { 061 Class<T> answer = CastUtils.cast(loadClass(name, DefaultClassResolver.class.getClassLoader())); 062 if (answer == null && getApplicationContextClassLoader() != null) { 063 // fallback and use application context class loader 064 answer = CastUtils.cast(loadClass(name, getApplicationContextClassLoader())); 065 } 066 return answer; 067 } 068 069 public Class<?> resolveClass(String name, ClassLoader loader) { 070 return loadClass(name, loader); 071 } 072 073 public <T> Class<T> resolveClass(String name, Class<T> type, ClassLoader loader) { 074 return CastUtils.cast(loadClass(name, loader)); 075 } 076 077 public Class<?> resolveMandatoryClass(String name) throws ClassNotFoundException { 078 Class<?> answer = resolveClass(name); 079 if (answer == null) { 080 throw new ClassNotFoundException(name); 081 } 082 return answer; 083 } 084 085 public <T> Class<T> resolveMandatoryClass(String name, Class<T> type) throws ClassNotFoundException { 086 Class<T> answer = resolveClass(name, type); 087 if (answer == null) { 088 throw new ClassNotFoundException(name); 089 } 090 return answer; 091 } 092 093 public Class<?> resolveMandatoryClass(String name, ClassLoader loader) throws ClassNotFoundException { 094 Class<?> answer = resolveClass(name, loader); 095 if (answer == null) { 096 throw new ClassNotFoundException(name); 097 } 098 return answer; 099 } 100 101 public <T> Class<T> resolveMandatoryClass(String name, Class<T> type, ClassLoader loader) throws ClassNotFoundException { 102 Class<T> answer = resolveClass(name, type, loader); 103 if (answer == null) { 104 throw new ClassNotFoundException(name); 105 } 106 return answer; 107 } 108 109 public InputStream loadResourceAsStream(String uri) { 110 ObjectHelper.notEmpty(uri, "uri"); 111 return ObjectHelper.loadResourceAsStream(uri, getApplicationContextClassLoader()); 112 } 113 114 public URL loadResourceAsURL(String uri) { 115 ObjectHelper.notEmpty(uri, "uri"); 116 return ObjectHelper.loadResourceAsURL(uri, getApplicationContextClassLoader()); 117 } 118 119 public Enumeration<URL> loadResourcesAsURL(String uri) { 120 return loadAllResourcesAsURL(uri); 121 } 122 123 public Enumeration<URL> loadAllResourcesAsURL(String uri) { 124 ObjectHelper.notEmpty(uri, "uri"); 125 return ObjectHelper.loadResourcesAsURL(uri); 126 } 127 128 protected Class<?> loadClass(String name, ClassLoader loader) { 129 ObjectHelper.notEmpty(name, "name"); 130 return ObjectHelper.loadClass(name, loader); 131 } 132 133 protected ClassLoader getApplicationContextClassLoader() { 134 return camelContext != null ? camelContext.getApplicationContextClassLoader() : null; 135 } 136 137}