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.impl;
018
019import java.util.ArrayList;
020import java.util.Collections;
021import java.util.List;
022import java.util.Map;
023import java.util.Set;
024
025import org.apache.camel.NoSuchBeanException;
026import org.apache.camel.RuntimeCamelException;
027import org.apache.camel.spi.Registry;
028
029/**
030 * This registry will look up the object with the sequence of the registry list until it finds the Object.
031 */
032public class CompositeRegistry implements Registry {
033    private final List<Registry> registryList;
034    
035    public CompositeRegistry() {
036        registryList = new ArrayList<Registry>();
037    }
038    
039    public CompositeRegistry(List<Registry> registries) {
040        registryList = registries;
041    }
042    
043    public void addRegistry(Registry registry) {
044        registryList.add(registry);
045    }
046
047    List<Registry> getRegistryList() {
048        return registryList;
049    }
050
051    public <T> T lookupByNameAndType(String name, Class<T> type) {
052        T answer = null;
053        RuntimeCamelException ex = null;
054        for (Registry registry : registryList) {
055            try {
056                answer = registry.lookupByNameAndType(name, type);
057            } catch (Throwable e) {
058                // do not double wrap the exception
059                if (e instanceof NoSuchBeanException) {
060                    ex = (NoSuchBeanException)e;
061                } else {
062                    ex = new NoSuchBeanException(name, "Cannot lookup: " + name + " from registry: " + registry
063                        + " with expected type: " + type + " due: " + e.getMessage(), e);
064                }
065            }
066            if (answer != null) {
067                return answer;
068            }
069        }
070        if (ex != null) { 
071            throw ex;
072        } else {
073            return answer;
074        }
075    }
076
077    public Object lookupByName(String name) {
078        Object answer = null;
079        for (Registry registry : registryList) {
080            answer = registry.lookupByName(name);
081            if (answer != null) {
082                break;
083            }
084        }
085        return answer;
086    }
087
088    public <T> Map<String, T> findByTypeWithName(Class<T> type) {
089        Map<String, T> answer = Collections.emptyMap();
090        for (Registry registry : registryList) {
091            answer = registry.findByTypeWithName(type);
092            if (!answer.isEmpty()) {
093                break;
094            }
095        }
096        return answer;
097    }
098
099    public <T> Set<T> findByType(Class<T> type) {
100        Set<T> answer = Collections.emptySet();
101        for (Registry registry : registryList) {
102            answer = registry.findByType(type);
103            if (!answer.isEmpty()) {
104                break;
105            }
106        }
107        return answer;
108    }
109
110    public Object lookup(String name) {
111        return lookupByName(name);
112    }
113
114    public <T> T lookup(String name, Class<T> type) {
115        return lookupByNameAndType(name, type);
116    }
117
118    public <T> Map<String, T> lookupByType(Class<T> type) {
119        return findByTypeWithName(type);
120    }
121}