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.spi;
019
020 import static org.apache.camel.util.ObjectHelper.notNull;
021
022 import org.apache.camel.CamelContext;
023 import org.apache.camel.Component;
024 import org.apache.camel.spi.ComponentResolver;
025 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
026 import org.springframework.context.ApplicationContext;
027
028 /**
029 * An implementation of {@link ComponentResolver} which tries to find a Camel {@link Component}
030 * in the Spring {@link ApplicationContext} first; if its not there it defaults to the auto-discovery mechanism.
031 *
032 * @version $Revision: 530555 $
033 */
034 public class SpringComponentResolver implements ComponentResolver {
035 private final ApplicationContext applicationContext;
036 private final ComponentResolver nextResolver;
037
038 public SpringComponentResolver(ApplicationContext applicationContext, ComponentResolver nextResolver) {
039 notNull(applicationContext, "applicationContext");
040 this.applicationContext = applicationContext;
041 this.nextResolver = nextResolver;
042 }
043
044 public Component resolveComponent(String name, CamelContext context) throws Exception {
045 Object bean = null;
046 try {
047 bean = applicationContext.getBean(name);
048 }
049 catch (NoSuchBeanDefinitionException e) {
050 // ignore its not an error
051 }
052 if (bean != null) {
053 if (bean instanceof Component) {
054 return (Component) bean;
055 }
056 else {
057 throw new IllegalArgumentException("Bean with name: " + name + " in spring context is not a Component: " + bean);
058 }
059 }
060 if (nextResolver == null) {
061 return null;
062 }
063 return nextResolver.resolveComponent(name, context);
064 }
065 }