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 }