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.RoutesBuilder;
025 import org.apache.camel.builder.RouteBuilder;
026 import org.apache.camel.spi.PackageScanClassResolver;
027 import org.apache.commons.logging.Log;
028 import org.apache.commons.logging.LogFactory;
029 import org.springframework.beans.factory.config.BeanPostProcessor;
030 import org.springframework.context.ApplicationContext;
031
032 /**
033 * A helper class which will find all {@link RouteBuilder} instances on the classpath
034 *
035 * @version $Revision: 788067 $
036 */
037 public class RouteBuilderFinder {
038 private static final transient Log LOG = LogFactory.getLog(RouteBuilderFinder.class);
039 private final SpringCamelContext camelContext;
040 private final String[] packages;
041 private PackageScanClassResolver resolver;
042 private ApplicationContext applicationContext;
043 private BeanPostProcessor beanPostProcessor;
044
045 @SuppressWarnings("unchecked")
046 public RouteBuilderFinder(SpringCamelContext camelContext, String[] packages, ClassLoader classLoader,
047 BeanPostProcessor postProcessor, PackageScanClassResolver resolver) {
048 this.camelContext = camelContext;
049 this.applicationContext = camelContext.getApplicationContext();
050 this.packages = packages;
051 this.beanPostProcessor = postProcessor;
052 this.resolver = resolver;
053 // add our provided loader as well
054 resolver.addClassLoader(classLoader);
055 }
056
057 public String[] getPackages() {
058 return packages;
059 }
060
061 public ApplicationContext getApplicationContext() {
062 return applicationContext;
063 }
064
065 /**
066 * Appends all the {@link RouteBuilder} instances that can be found on the classpath
067 */
068 public void appendBuilders(List<RoutesBuilder> list) throws IllegalAccessException, InstantiationException {
069 Set<Class> classes = resolver.findImplementations(RoutesBuilder.class, packages);
070 for (Class aClass : classes) {
071 if (shouldIgnoreBean(aClass)) {
072 continue;
073 }
074 if (isValidClass(aClass)) {
075 RoutesBuilder builder = instantiateBuilder(aClass);
076 if (beanPostProcessor != null) {
077 // Inject the annotated resource
078 beanPostProcessor.postProcessBeforeInitialization(builder, builder.toString());
079 }
080 list.add(builder);
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 return true;
106 }
107 return false;
108 }
109
110 @SuppressWarnings("unchecked")
111 protected RoutesBuilder instantiateBuilder(Class type) throws IllegalAccessException, InstantiationException {
112 return (RoutesBuilder) camelContext.getInjector().newInstance(type);
113 }
114 }