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 */
017 package org.apache.camel.spring;
018
019 import java.lang.reflect.Modifier;
020 import java.util.List;
021 import java.util.Map;
022 import java.util.Set;
023
024 import org.apache.camel.builder.RouteBuilder;
025 import org.apache.camel.util.ResolverUtil;
026
027 import org.springframework.context.ApplicationContext;
028
029 /**
030 * A helper class which will find all {@link RouteBuilder} instances on the classpath
031 *
032 * @version $Revision: 563665 $
033 */
034 public class RouteBuilderFinder {
035 private final SpringCamelContext camelContext;
036 private final String[] packages;
037 private ApplicationContext applicationContext;
038 private ResolverUtil resolver = new ResolverUtil();
039
040 public RouteBuilderFinder(SpringCamelContext camelContext, String[] packages) {
041 this.camelContext = camelContext;
042 this.applicationContext = camelContext.getApplicationContext();
043 this.packages = packages;
044 }
045
046 public String[] getPackages() {
047 return packages;
048 }
049
050 public ApplicationContext getApplicationContext() {
051 return applicationContext;
052 }
053
054
055 /**
056 * Appends all the {@link RouteBuilder} instances that can be found on the classpath
057 */
058 public void appendBuilders(List<RouteBuilder> list) throws IllegalAccessException, InstantiationException {
059 resolver.findImplementations(RouteBuilder.class, packages);
060 //resolver.findAnnotated(Endpoint.class, packages);
061 Set<Class> classes = resolver.getClasses();
062 for (Class aClass : classes) {
063 if (shouldIgnoreBean(aClass)) {
064 continue;
065 }
066 if (isValidClass(aClass)) {
067 RouteBuilder builder = instantiateBuilder(aClass);
068 list.add(builder);
069 }
070 }
071 }
072
073 public void destroy() throws Exception {
074 }
075
076 /**
077 * Lets ignore beans that are not explicitly configured in the spring.xml
078 */
079 protected boolean shouldIgnoreBean(Class type) {
080 Map beans = applicationContext.getBeansOfType(type, true, true);
081 if (beans == null || beans.isEmpty()) {
082 return false;
083 }
084 // TODO apply some filter?
085 return true;
086 }
087
088 /**
089 * Returns true if the object is non-abstract and supports a zero argument constructor
090 */
091 protected boolean isValidClass(Class type) {
092 if (!Modifier.isAbstract(type.getModifiers()) && !type.isInterface()) {
093 return true;
094 }
095 return false;
096 }
097
098 protected RouteBuilder instantiateBuilder(Class type) throws IllegalAccessException, InstantiationException {
099 return (RouteBuilder) camelContext.getInjector().newInstance(type);
100 }
101 }