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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              //see if a defined header property
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  }