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 static org.apache.camel.util.ObjectHelper.notNull;
021
022 import java.net.URI;
023
024 import org.apache.camel.CamelContext;
025 import org.apache.camel.Component;
026 import org.apache.camel.spi.ComponentResolver;
027 import org.springframework.context.ApplicationContext;
028
029 /**
030 * An implementation of {@link ComponentResolver} which tries to find a Camel {@link Component}
031 * in the Spring {@link ApplicationContext} first; if its not there it defaults to the auto-discovery mechanism.
032 *
033 * @version $Revision: 525634 $
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 uri, CamelContext context) throws Exception {
046 String scheme = new URI(uri).getScheme();
047 Object bean = applicationContext.getBean(scheme);
048 if (bean != null) {
049 if (bean instanceof Component) {
050 return (Component) bean;
051 }
052 else {
053 throw new IllegalArgumentException("Bean with name: " + bean + " in spring context is not a Component: " + bean);
054 }
055 }
056 if (nextResolver == null) {
057 return null;
058 }
059 return nextResolver.resolveComponent(uri, context);
060 }
061 }