1 /***
2 *
3 * Copyright 2004 Protique Ltd
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 **/
18 package org.codehaus.activemq.service;
19
20 import java.io.Serializable;
21
22 /***
23 * Represents a message identity, either by using a unique
24 * message number, which is ordered and must not be zero or
25 * by specifying the String messageID.
26 * <p/>
27 * Typically a client accessing the MessageStore may have
28 * one or the other. Depending on which one is specified the
29 * other value may be filled in by operations on the MessageStore
30 *
31 * @version $Revision: 1.10 $
32 */
33 public class MessageIdentity implements Comparable, Serializable {
34 private static final long serialVersionUID = -5754338187296859149L;
35
36 private String messageID;
37 private Object sequenceNumber;
38
39 public MessageIdentity() {
40 }
41
42 public MessageIdentity(String messageID) {
43 this.messageID = messageID;
44 }
45
46 public MessageIdentity(String messageID, Object sequenceNumber) {
47 this.messageID = messageID;
48 this.sequenceNumber = sequenceNumber;
49 }
50
51 public int hashCode() {
52 return messageID != null ? messageID.hashCode() ^ 0xcafebabe : -1;
53 }
54
55 public boolean equals(Object that) {
56 return that instanceof MessageIdentity && equals((MessageIdentity) that);
57 }
58
59 public boolean equals(MessageIdentity that) {
60 return messageID.equals(that.messageID);
61 }
62
63 public int compareTo(Object object) {
64 if (this == object) {
65 return 0;
66 }
67 else {
68 if (object instanceof MessageIdentity) {
69 MessageIdentity that = (MessageIdentity) object;
70 return messageID.compareTo(that.messageID);
71 }
72 else {
73 return -1;
74 }
75 }
76 }
77
78 public String toString() {
79 return super.toString() + "[id=" + messageID + "; sequenceNo=" + sequenceNumber + "]";
80 }
81
82 public String getMessageID() {
83 return messageID;
84 }
85
86 public void setMessageID(String messageID) {
87 this.messageID = messageID;
88 }
89
90 /***
91 * @return the sequence number which may be a number or some database specific type
92 */
93 public Object getSequenceNumber() {
94 return sequenceNumber;
95 }
96
97 public void setSequenceNumber(Object sequenceNumber) {
98 this.sequenceNumber = sequenceNumber;
99 }
100
101 }