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The ActiveMQ Message Broker and Client implementations
/**
* 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.
*/
package org.apache.activemq.util;
import java.io.Serializable;
import java.util.Comparator;
import javax.jms.Message;
/**
* A base class for comparators which works on JMS {@link Message} objects
*
* @version $Revision: 564057 $
*/
public abstract class MessageComparatorSupport implements Comparator, Serializable {
public int compare(Object object1, Object object2) {
Message command1 = (Message)object1;
Message command2 = (Message)object2;
return compareMessages(command1, command2);
}
protected abstract int compareMessages(Message message1, Message message2);
protected int compareComparators(final Comparable comparable, final Comparable comparable2) {
if (comparable == null && comparable2 == null) {
return 0;
} else if (comparable != null) {
if (comparable2 == null) {
return 1;
}
return comparable.compareTo(comparable2);
} else if (comparable2 != null) {
if (comparable == null) {
return -11;
}
return comparable2.compareTo(comparable) * -1;
}
return 0;
}
}