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.spi;
018
019 import org.apache.camel.CamelContext;
020 import org.apache.camel.Component;
021 import org.apache.camel.spi.ComponentResolver;
022
023 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
024 import org.springframework.context.ApplicationContext;
025
026 import static org.apache.camel.util.ObjectHelper.notNull;
027
028 /**
029 * An implementation of {@link ComponentResolver} which tries to find a Camel
030 * {@link Component} in the Spring {@link ApplicationContext} first; if its not
031 * there it defaults to the auto-discovery mechanism.
032 *
033 * @version $Revision: 563665 $
034 */
035 public class SpringComponentResolver implements ComponentResolver {
036 private final ApplicationContext applicationContext;
037 private final ComponentResolver nextResolver;
038
039 public SpringComponentResolver(ApplicationContext applicationContext, ComponentResolver nextResolver) {
040 notNull(applicationContext, "applicationContext");
041 this.applicationContext = applicationContext;
042 this.nextResolver = nextResolver;
043 }
044
045 public Component resolveComponent(String name, CamelContext context) throws Exception {
046 Object bean = null;
047 try {
048 bean = applicationContext.getBean(name);
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 } else {
056 throw new IllegalArgumentException("Bean with name: " + name + " in spring context is not a Component: " + bean);
057 }
058 }
059 if (nextResolver == null) {
060 return null;
061 }
062 return nextResolver.resolveComponent(name, context);
063 }
064 }