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