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 java.util.HashSet;
020    import java.util.Map;
021    import java.util.Set;
022    
023    import org.apache.camel.NoSuchBeanException;
024    import org.apache.camel.spi.Registry;
025    import org.springframework.beans.factory.BeanFactoryUtils;
026    import org.springframework.beans.factory.BeanNotOfRequiredTypeException;
027    import org.springframework.beans.factory.NoSuchBeanDefinitionException;
028    import 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     */
036    public 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    }