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
19 package org.codehaus.activemq.filter;
20
21 import javax.jms.JMSException;
22 import javax.jms.Message;
23
24 /***
25 * Represents a property expression
26 *
27 * @version $Revision: 1.1 $
28 */
29 public class PropertyExpression implements Expression {
30
31 private String name;
32
33 public PropertyExpression(String name) {
34 this.name = name;
35 }
36
37 public Object evaluate(Message message) throws JMSException {
38 Object result = null;
39 if (name != null) {
40 result = message.getObjectProperty(name);
41 }
42 if (result == null) {
43
44 if (name.equals("JMSType")) {
45 result = message.getJMSType();
46 }
47 else if (name.equals("JMSMessageID")) {
48 result = message.getJMSMessageID();
49 }
50 else if (name.equals("JMSCorrelationID")) {
51 result = message.getJMSCorrelationID();
52 }
53 else if (name.equals("JMSPriority")) {
54 result = new Integer(message.getJMSPriority());
55 }
56 else if (name.equals("JMSTimestamp")) {
57 result = new Long(message.getJMSTimestamp());
58 }
59 }
60 return result;
61 }
62
63 public String getName() {
64 return name;
65 }
66
67
68 /***
69 * @see java.lang.Object#toString()
70 */
71 public String toString() {
72 return name;
73 }
74
75 /***
76 * @see java.lang.Object#hashCode()
77 */
78 public int hashCode() {
79 return name.hashCode();
80 }
81
82 /***
83 * @see java.lang.Object#equals(java.lang.Object)
84 */
85 public boolean equals(Object o) {
86
87 if (o == null || !this.getClass().equals(o.getClass())) {
88 return false;
89 }
90 return name.equals(((PropertyExpression) o).name);
91
92 }
93
94 }