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.activemq.util;
018    
019    import javax.jms.Destination;
020    import javax.jms.JMSException;
021    import javax.jms.Message;
022    
023    import org.apache.activemq.command.ActiveMQMessage;
024    
025    /**
026     * A comparator which works on SendCommand objects to compare the destinations
027     * 
028     * 
029     */
030    public class MessageDestinationComparator extends MessageComparatorSupport {
031    
032        protected int compareMessages(Message message1, Message message2) {
033            return compareComparators(getComparable(getDestination(message1)), getComparable(getDestination(message2)));
034        }
035    
036        protected Destination getDestination(Message message) {
037            if (message instanceof ActiveMQMessage) {
038                ActiveMQMessage amqMessage = (ActiveMQMessage)message;
039                return amqMessage.getDestination();
040            }
041            try {
042                return message.getJMSDestination();
043            } catch (JMSException e) {
044                return null;
045            }
046        }
047    
048        protected Comparable getComparable(Destination destination) {
049            if (destination != null) {
050                return destination.toString();
051            }
052            return null;
053        }
054    
055    }