RC9/qpid/java/broker/src/main/java/org/apache/qpid/server/exchange/topic/TopicWordDictionary.java

package org.apache.qpid.server.exchange.topic;

import org.apache.qpid.framing.AMQShortString;

import java.util.concurrent.ConcurrentHashMap;

/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
public class TopicWordDictionary
{
    private final ConcurrentHashMap<AMQShortString,TopicWord> _dictionary =
            new ConcurrentHashMap<AMQShortString,TopicWord>();



    public TopicWordDictionary()
    {
        _dictionary.put(new AMQShortString("*"), TopicWord.ANY_WORD);
        _dictionary.put(new AMQShortString("#"), TopicWord.WILDCARD_WORD);
    }




    public TopicWord getOrCreateWord(AMQShortString name)
    {
        TopicWord word = _dictionary.putIfAbsent(name, new TopicWord(name));
        if(word == null)
        {
            word = _dictionary.get(name);
        }
        return word;
    }


    public TopicWord getWord(AMQShortString name)
    {
        TopicWord word = _dictionary.get(name);
        if(word == null)
        {
            word = TopicWord.ANY_WORD;
        }
        return word;
    }
}