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
64 public int compare(Object o1, Object o2) {
65
66 int result = -1;
67
68
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
99 public boolean equals(Object obj) {
100
101 if (obj instanceof MessageHandleComparator) {
102 return true;
103 } else {
104 return false;
105 }
106 }
107 }
108