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.Map;
021    import java.util.concurrent.atomic.AtomicInteger;
022    
023    import org.apache.camel.model.OptionalIdentifiedDefinition;
024    import org.apache.camel.spi.NodeIdFactory;
025    
026    /**
027     * Default id factory.
028     *
029     * @version $Revision: 835531 $
030     */
031    public class DefaultNodeIdFactory implements NodeIdFactory {
032    
033        protected static Map<String, AtomicInteger> nodeCounters = new HashMap<String, AtomicInteger>();
034    
035        public String createId(OptionalIdentifiedDefinition<?> definition) {
036            String key = definition.getShortName();
037            return key + getNodeCounter(key).incrementAndGet();
038        }
039    
040        /**
041         * Returns the counter for the given node key, lazily creating one if necessary
042         */
043        protected static synchronized AtomicInteger getNodeCounter(String key) {
044            AtomicInteger answer = nodeCounters.get(key);
045            if (answer == null) {
046                answer = new AtomicInteger(0);
047                nodeCounters.put(key, answer);
048            }
049            return answer;
050        }
051    }