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1 /*** 2 * Redistribution and use of this software and associated documentation 3 * ("Software"), with or without modification, are permitted provided 4 * that the following conditions are met: 5 * 6 * 1. Redistributions of source code must retain copyright 7 * statements and notices. Redistributions must also contain a 8 * copy of this document. 9 * 10 * 2. Redistributions in binary form must reproduce the 11 * above copyright notice, this list of conditions and the 12 * following disclaimer in the documentation and/or other 13 * materials provided with the distribution. 14 * 15 * 3. The name "Exolab" must not be used to endorse or promote 16 * products derived from this Software without prior written 17 * permission of Exoffice Technologies. For written permission, 18 * please contact info@exolab.org. 19 * 20 * 4. Products derived from this Software may not be called "Exolab" 21 * nor may "Exolab" appear in their names without prior written 22 * permission of Exoffice Technologies. Exolab is a registered 23 * trademark of Exoffice Technologies. 24 * 25 * 5. Due credit should be given to the Exolab Project 26 * (http://www.exolab.org/). 27 * 28 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS 29 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 30 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 31 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 32 * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 33 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 34 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 35 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 39 * OF THE POSSIBILITY OF SUCH DAMAGE. 40 * 41 * Copyright 2000,2003 (C) Exoffice Technologies Inc. All Rights Reserved. 42 */ 43 44 package org.exolab.jms.messagemgr; 45 46 47 import java.util.Comparator; 48 49 import org.exolab.jms.message.MessageHandle; 50 51 52 /*** 53 * The MessageHandleComparator is used to order messages within a 54 * list. The messages are ordered on priority, time and sequence 55 * number. 56 * 57 * @version $Revision: 1.6 $ $Date: 2003/08/17 01:32:24 $ 58 * @author <a href="mailto:jima@intalio.com">Jim Mourikis</a> 59 */ 60 public class MessageHandleComparator 61 implements Comparator { 62 63 // implementation of Comparator.compare 64 public int compare(Object o1, Object o2) { 65 66 int result = -1; 67 68 // The order is on priority-acceptance time-sequence number 69 if ((o1 instanceof MessageHandle) && 70 (o2 instanceof MessageHandle)) { 71 MessageHandle m1 = (MessageHandle) o1; 72 MessageHandle m2 = (MessageHandle) o2; 73 74 if (m1.getPriority() == m2.getPriority()) { 75 if (m1.getAcceptedTime() == m2.getAcceptedTime()) { 76 if (m1.getSequenceNumber() == m2.getSequenceNumber()) { 77 result = 0; 78 } else if (m1.getSequenceNumber() > m2.getSequenceNumber()) { 79 result = 1; 80 } else { 81 result = -1; 82 } 83 } else if (m1.getAcceptedTime() > m2.getAcceptedTime()) { 84 result = 1; 85 } else { 86 result = -1; 87 } 88 } else if (m1.getPriority() > m2.getPriority()) { 89 result = -1; 90 } else { 91 result = 1; 92 } 93 } 94 95 return result; 96 } 97 98 // implementation of Comparator.equals 99 public boolean equals(Object obj) { 100 101 if (obj instanceof MessageHandleComparator) { 102 return true; 103 } else { 104 return false; 105 } 106 } 107 } 108

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