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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 (C) Exoffice Technologies Inc. All Rights Reserved. 42 * 43 * $Id: DateTimeComparator.java,v 1.4 2003/08/17 01:32:25 tanderson Exp $ 44 * 45 * Date Author Changes 46 * $Date jimm Created 47 */ 48 49 50 package org.exolab.jms.persistence; 51 52 import java.util.Comparator; 53 54 import javax.jms.JMSException; 55 56 57 /*** 58 * A comparator class that iplements a date/time comparison for 59 * PersistentMessage 60 * 61 * @version $Revision: 1.4 $ $Date: 2003/08/17 01:32:25 $ 62 * @author <a href="mailto:mourikis@exolab.org">Jim Mourikis</a> 63 */ 64 public class DateTimeComparator implements Comparator { 65 66 /*** 67 * Default constructor does nothing. 68 * 69 */ 70 public DateTimeComparator() { 71 72 } 73 74 75 /*** 76 * Implements the compare operator. 77 * Compares its two arguments for order. Returns a negative integer, zero, 78 * or a positive integer as the first argument is less than, equal to, 79 * or greater than the second. 80 * 81 * @param Object object 1 to compare 82 * @param Object object 2 ro compare to. 83 * @return int returns -1, 0, 1 if the first argument is less than, 84 * equal to, or greater than the second. 85 * @exception ClassCastException if object types are unknown 86 * 87 */ 88 public int compare(Object o1, Object o2) throws ClassCastException { 89 int status; 90 91 if (o1 == null && o2 == null) 92 status = 0; 93 else if (o1 == null) 94 status = -1; 95 else if (o2 == null) 96 status = 1; 97 else if (o1 instanceof PersistentMessage && 98 o2 instanceof PersistentMessage) { 99 PersistentMessage m1 = (PersistentMessage) o1; 100 PersistentMessage m2 = (PersistentMessage) o2; 101 long t1; 102 long t2; 103 104 try { 105 t1 = m1.getMessage().getJMSTimestamp(); 106 } catch (JMSException e1) { 107 t1 = 0; 108 } 109 try { 110 t2 = m2.getMessage().getJMSTimestamp(); 111 } catch (JMSException e2) { 112 t2 = 0; 113 } 114 115 if (t1 < t2) 116 status = -1; 117 else if (t1 == t2) 118 status = 0; 119 else 120 status = 1; 121 } else { 122 throw new ClassCastException("Unknown Object"); 123 } 124 return status; 125 } 126 127 128 /*** 129 * Indicates whether some other object is "equal to" this Comparator. 130 * This method must obey the general contract of Object.equals(Object). 131 * 132 * @param Object the object to compare to 133 * @return boolean true iff objects are equal 134 * 135 */ 136 public boolean equals(Object ob) { 137 boolean status = false; 138 139 if (ob instanceof DateTimeComparator) status = true; 140 141 return status; 142 } 143 144 145 } // End DateTimeComparator

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