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 */
017package org.apache.camel.spring.spi;
018
019import java.util.HashSet;
020import java.util.Map;
021import java.util.Set;
022
023import org.apache.camel.NoSuchBeanException;
024import org.apache.camel.spi.Registry;
025import org.springframework.beans.factory.BeanFactoryUtils;
026import org.springframework.beans.factory.BeanNotOfRequiredTypeException;
027import org.springframework.beans.factory.NoSuchBeanDefinitionException;
028import org.springframework.context.ApplicationContext;
029
030/**
031 * A {@link Registry} implementation which looks up the objects in the Spring
032 * {@link ApplicationContext}
033 * 
034 * @version 
035 */
036public class ApplicationContextRegistry implements Registry {
037    private ApplicationContext applicationContext;
038
039    public ApplicationContextRegistry(ApplicationContext applicationContext) {
040        this.applicationContext = applicationContext;
041    }
042
043    @Override
044    public <T> T lookupByNameAndType(String name, Class<T> type) {
045        Object answer;
046        try {
047            answer = applicationContext.getBean(name, type);
048        } catch (NoSuchBeanDefinitionException e) {
049            return null;
050        } catch (BeanNotOfRequiredTypeException e) {
051            return null;
052        }
053
054        // just to be safe
055        if (answer == null) {
056            return null;
057        }
058
059        try {
060            return type.cast(answer);
061        } catch (Throwable e) {
062            String msg = "Found bean: " + name + " in ApplicationContext: " + applicationContext
063                    + " of type: " + answer.getClass().getName() + " expected type was: " + type;
064            throw new NoSuchBeanException(name, msg, e);
065        }
066    }
067
068    @Override
069    public Object lookupByName(String name) {
070        try {
071            return applicationContext.getBean(name);
072        } catch (NoSuchBeanDefinitionException e) {
073            return null;
074        }
075    }
076
077    @Override
078    public <T> Set<T> findByType(Class<T> type) {
079        Map<String, T> map = findByTypeWithName(type);
080        return new HashSet<T>(map.values());
081    }
082
083    @Override
084    public <T> Map<String, T> findByTypeWithName(Class<T> type) {
085        return BeanFactoryUtils.beansOfTypeIncludingAncestors(applicationContext, type);
086    }
087
088    @Override
089    public Object lookup(String name) {
090        return lookupByName(name);
091    }
092
093    @Override
094    public <T> T lookup(String name, Class<T> type) {
095        return lookupByNameAndType(name, type);
096    }
097
098    @Override
099    public <T> Map<String, T> lookupByType(Class<T> type) {
100        return findByTypeWithName(type);
101    }
102
103}