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Java > Open Source Codes > org > exolab > jms > lease > LeaseComparator


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 1999 (C) Exoffice Technologies Inc. All Rights Reserved.
42  *
43  * $Id: LeaseComparator.java,v 1.1 2004/11/26 01:50:42 tanderson Exp $
44  *
45  * Date Author Changes
46  * 3/01/2000 jima Created
47  */
48 package org.exolab.jms.lease;
49
50 import java.util.Comparator JavaDoc;
51
52
53 /**
54  * The LeaseComparator is usedto sort leases based on the expiration
55  * time
56  *
57  * @version $Revision: 1.1 $ $Date: 2004/11/26 01:50:42 $
58  * @author <a HREF="mailto:jima@exoffice.com">Jim Alateras</a>
59  **/
60 public class LeaseComparator
61     implements Comparator JavaDoc {
62
63     /**
64      * Compare two objects and return 0 if they are equal, a negative integer
65      * if the first argument is less than the second argument and a positive
66      * number if the first argument is greater than the second argument
67      * <p>
68      * It will throw ClassCastException if either obj1 or obj2 are not of type
69      * BaseLease
70      *
71      * @param obj1 first object to compare
72      * @param obj2 second object to compare
73      * @return int
74      */
75     public int compare(Object JavaDoc obj1, Object JavaDoc obj2) {
76         int result = 0;
77
78         if ((obj1 instanceof BaseLease) &&
79             (obj2 instanceof BaseLease)) {
80             BaseLease lease1 = (BaseLease) obj1;
81             BaseLease lease2 = (BaseLease) obj2;
82
83             if (lease1.getExpiryTime() != lease2.getExpiryTime()) {
84                 if (lease1.getExpiryTime() < lease2.getExpiryTime()) {
85                     result = -1;
86                 } else {
87                     result = 1;
88                 }
89             }
90         } else {
91             throw new ClassCastException JavaDoc("obj1 is of type " +
92                 obj1.getClass().getName() + " obj2 is of type " +
93                 obj2.getClass().getName());
94         }
95
96         return result;
97     }
98
99     /**
100      * Return true if the specified comparator matches this object and
101      * false otherwise
102      *
103      * @param comparator comparator to test
104      * @return boolean true if they are the same
105      */
106     public boolean equals(Object JavaDoc comparator) {
107         return comparator instanceof LeaseComparator;
108     }
109 }
110
111
112
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