001 /** 002 * 003 * Copyright 2004 Protique Ltd 004 * 005 * Licensed under the Apache License, Version 2.0 (the "License"); 006 * you may not use this file except in compliance with the License. 007 * You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 * 017 **/ 018 019 package org.activemq.filter; 020 021 import javax.jms.JMSException; 022 import javax.jms.Message; 023 024 /** 025 * Represents a property expression 026 * 027 * @version $Revision: 1.1.1.1 $ 028 */ 029 public class PropertyExpression implements Expression { 030 031 private String name; 032 033 public PropertyExpression(String name) { 034 this.name = name; 035 } 036 037 public Object evaluate(Message message) throws JMSException { 038 Object result = null; 039 if (name != null) { 040 result = message.getObjectProperty(name); 041 } 042 if (result == null) { 043 //see if a defined header property 044 if (name.equals("JMSType")) { 045 result = message.getJMSType(); 046 } 047 else if (name.equals("JMSMessageID")) { 048 result = message.getJMSMessageID(); 049 } 050 else if (name.equals("JMSCorrelationID")) { 051 result = message.getJMSCorrelationID(); 052 } 053 else if (name.equals("JMSPriority")) { 054 result = new Integer(message.getJMSPriority()); 055 } 056 else if (name.equals("JMSTimestamp")) { 057 result = new Long(message.getJMSTimestamp()); 058 } 059 } 060 return result; 061 } 062 063 public String getName() { 064 return name; 065 } 066 067 068 /** 069 * @see java.lang.Object#toString() 070 */ 071 public String toString() { 072 return name; 073 } 074 075 /** 076 * @see java.lang.Object#hashCode() 077 */ 078 public int hashCode() { 079 return name.hashCode(); 080 } 081 082 /** 083 * @see java.lang.Object#equals(java.lang.Object) 084 */ 085 public boolean equals(Object o) { 086 087 if (o == null || !this.getClass().equals(o.getClass())) { 088 return false; 089 } 090 return name.equals(((PropertyExpression) o).name); 091 092 } 093 094 }