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 }