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.impl;
018    
019    import java.util.HashMap;
020    import java.util.HashSet;
021    import java.util.Map;
022    import java.util.Set;
023    
024    import org.apache.camel.NoSuchBeanException;
025    import org.apache.camel.spi.Registry;
026    
027    /**
028     * A {@link Map}-based registry.
029     */
030    public class SimpleRegistry extends HashMap<String, Object> implements Registry {
031    
032        private static final long serialVersionUID = -3739035212761568984L;
033    
034        public Object lookupByName(String name) {
035            return get(name);
036        }
037    
038        public <T> T lookupByNameAndType(String name, Class<T> type) {
039            Object answer = lookupByName(name);
040    
041            // just to be safe
042            if (answer == null) {
043                return null;
044            }
045    
046            try {
047                return type.cast(answer);
048            } catch (Throwable e) {
049                String msg = "Found bean: " + name + " in SimpleRegistry: " + this
050                        + " of type: " + answer.getClass().getName() + " expected type was: " + type;
051                throw new NoSuchBeanException(name, msg, e);
052            }
053        }
054    
055        public <T> Map<String, T> findByTypeWithName(Class<T> type) {
056            Map<String, T> result = new HashMap<String, T>();
057            for (Map.Entry<String, Object> entry : entrySet()) {
058                if (type.isInstance(entry.getValue())) {
059                    result.put(entry.getKey(), type.cast(entry.getValue()));
060                }
061            }
062            return result;
063        }
064    
065        public <T> Set<T> findByType(Class<T> type) {
066            Set<T> result = new HashSet<T>();
067            for (Map.Entry<String, Object> entry : entrySet()) {
068                if (type.isInstance(entry.getValue())) {
069                    result.add(type.cast(entry.getValue()));
070                }
071            }
072            return result;
073        }
074    
075        public Object lookup(String name) {
076            return lookupByName(name);
077        }
078    
079        public <T> T lookup(String name, Class<T> type) {
080            return lookupByNameAndType(name, type);
081        }
082    
083        public <T> Map<String, T> lookupByType(Class<T> type) {
084            return findByTypeWithName(type);
085        }
086    }