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 2000-2005 (C) Exoffice Technologies Inc. All Rights Reserved.
42 */
43 package org.exolab.jms.messagemgr;
44
45
46 import java.util.Comparator;
47
48
49 /***
50 * MessageHandleComparator is used to order messages on priority, acceptance
51 * time and sequence number.
52 *
53 * @version $Revision: 1.2 $ $Date: 2005/03/18 03:58:39 $
54 * @author <a href="mailto:jimm@intalio.com">Jim Mourikis</a>
55 */
56 public class MessageHandleComparator
57 implements Comparator {
58
59
60 public int compare(Object o1, Object o2) {
61
62 int result = -1;
63
64
65 if ((o1 instanceof MessageHandle) &&
66 (o2 instanceof MessageHandle)) {
67 MessageHandle m1 = (MessageHandle) o1;
68 MessageHandle m2 = (MessageHandle) o2;
69
70 if (m1.getPriority() == m2.getPriority()) {
71 if (m1.getAcceptedTime() == m2.getAcceptedTime()) {
72 if (m1.getSequenceNumber() == m2.getSequenceNumber()) {
73 result = 0;
74 } else if (m1.getSequenceNumber() > m2.getSequenceNumber()) {
75 result = 1;
76 } else {
77 result = -1;
78 }
79 } else if (m1.getAcceptedTime() > m2.getAcceptedTime()) {
80 result = 1;
81 } else {
82 result = -1;
83 }
84 } else if (m1.getPriority() > m2.getPriority()) {
85 result = -1;
86 } else {
87 result = 1;
88 }
89 }
90
91 return result;
92 }
93
94
95 public boolean equals(Object obj) {
96
97 if (obj instanceof MessageHandleComparator) {
98 return true;
99 } else {
100 return false;
101 }
102 }
103 }
104