001 /** 002 * 003 * Licensed to the Apache Software Foundation (ASF) under one or more 004 * contributor license agreements. See the NOTICE file distributed with 005 * this work for additional information regarding copyright ownership. 006 * The ASF licenses this file to You under the Apache License, Version 2.0 007 * (the "License"); you may not use this file except in compliance with 008 * the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 package org.apache.camel.spring; 019 020 import org.apache.camel.builder.RouteBuilder; 021 import org.apache.camel.util.ResolverUtil; 022 import org.springframework.beans.BeansException; 023 import org.springframework.context.ApplicationContext; 024 import org.springframework.context.ApplicationContextAware; 025 026 import java.lang.reflect.Constructor; 027 import java.lang.reflect.Modifier; 028 import java.util.List; 029 import java.util.Map; 030 import java.util.Set; 031 032 /** 033 * A helper class which will find all {@link RouteBuilder} instances on the classpath 034 * 035 * @version $Revision: 521369 $ 036 */ 037 public class RouteBuilderFinder implements ApplicationContextAware { 038 private String[] packages = {}; 039 private ApplicationContext applicationContext; 040 private ResolverUtil resolver = new ResolverUtil(); 041 042 public RouteBuilderFinder(ApplicationContext applicationContext, String[] packages) { 043 this.applicationContext = applicationContext; 044 this.packages = packages; 045 } 046 047 public RouteBuilderFinder(CamelContextFactoryBean factoryBean) { 048 this.applicationContext = factoryBean.getApplicationContext(); 049 this.packages = factoryBean.getPackages(); 050 } 051 052 public String[] getPackages() { 053 return packages; 054 } 055 056 public void setPackages(String[] packages) { 057 this.packages = packages; 058 } 059 060 public ApplicationContext getApplicationContext() { 061 return applicationContext; 062 } 063 064 public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { 065 this.applicationContext = applicationContext; 066 } 067 068 /** 069 * Appends all the {@link RouteBuilder} instances that can be found on the classpath 070 */ 071 public void appendBuilders(List<RouteBuilder> list) throws IllegalAccessException, InstantiationException { 072 resolver.findImplementations(RouteBuilder.class, packages); 073 //resolver.findAnnotated(Endpoint.class, packages); 074 Set<Class> classes = resolver.getClasses(); 075 for (Class aClass : classes) { 076 if (shouldIgnoreBean(aClass)) { 077 continue; 078 } 079 if (isValidClass(aClass)) { 080 list.add(instantiateBuilder(aClass)); 081 } 082 } 083 } 084 085 public void destroy() throws Exception { 086 } 087 088 /** 089 * Lets ignore beans that are not explicitly configured in the spring.xml 090 */ 091 protected boolean shouldIgnoreBean(Class type) { 092 Map beans = applicationContext.getBeansOfType(type, true, true); 093 if (beans == null || beans.isEmpty()) { 094 return false; 095 } 096 // TODO apply some filter? 097 return true; 098 } 099 100 /** 101 * Returns true if the object is non-abstract and supports a zero argument constructor 102 */ 103 protected boolean isValidClass(Class type) { 104 if (!Modifier.isAbstract(type.getModifiers()) && !type.isInterface()) { 105 Constructor[] constructors = type.getDeclaredConstructors(); 106 for (Constructor constructor : constructors) { 107 Class[] classes = constructor.getParameterTypes(); 108 if (classes.length == 0) { 109 return true; 110 } 111 } 112 } 113 return false; 114 } 115 116 protected RouteBuilder instantiateBuilder(Class type) throws IllegalAccessException, InstantiationException { 117 // TODO we could support spring-injection for these types 118 return (RouteBuilder) type.newInstance(); 119 } 120 }