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.BeanRepository;
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 BeanRepository} implementation which looks up the objects in the Spring
032 * {@link ApplicationContext}
033 */
034public class ApplicationContextBeanRepository implements BeanRepository {
035    private ApplicationContext applicationContext;
036
037    public ApplicationContextBeanRepository(ApplicationContext applicationContext) {
038        this.applicationContext = applicationContext;
039    }
040
041    @Override
042    public <T> T lookupByNameAndType(String name, Class<T> type) {
043        Object answer;
044        try {
045            answer = applicationContext.getBean(name, type);
046        } catch (NoSuchBeanDefinitionException e) {
047            return null;
048        } catch (BeanNotOfRequiredTypeException e) {
049            return null;
050        }
051
052        // just to be safe
053        if (answer == null) {
054            return null;
055        }
056
057        try {
058            return type.cast(answer);
059        } catch (Throwable e) {
060            String msg = "Found bean: " + name + " in ApplicationContext: " + applicationContext
061                    + " of type: " + answer.getClass().getName() + " expected type was: " + type;
062            throw new NoSuchBeanException(name, msg, e);
063        }
064    }
065
066    @Override
067    public Object lookupByName(String name) {
068        try {
069            return applicationContext.getBean(name);
070        } catch (NoSuchBeanDefinitionException e) {
071            return null;
072        }
073    }
074
075    @Override
076    public <T> Set<T> findByType(Class<T> type) {
077        Map<String, T> map = findByTypeWithName(type);
078        return new HashSet<>(map.values());
079    }
080
081    @Override
082    public <T> Map<String, T> findByTypeWithName(Class<T> type) {
083        return BeanFactoryUtils.beansOfTypeIncludingAncestors(applicationContext, type);
084    }
085
086}