001    /**
002     *
003     * Licensed to the Apache Software Foundation (ASF) under one or more
004     * contributor license agreements.  See the NOTICE file distributed with
005     * this work for additional information regarding copyright ownership.
006     * The ASF licenses this file to You under the Apache License, Version 2.0
007     * (the "License"); you may not use this file except in compliance with
008     * the License.  You may obtain a copy of the License at
009     *
010     * http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    
019    package org.granite.gravity.selector;
020    
021    import javax.jms.JMSException;
022    
023    import flex.messaging.messages.Message;
024    
025    /**
026     * Represents a property  expression
027     *
028     * @version $Revision: 1.5 $
029     */
030    public class PropertyExpression implements Expression {
031    
032        interface SubExpression {
033            public Object evaluate(Message message);
034        }
035    
036        private final String name;
037    
038        public PropertyExpression(String name) {
039            this.name = name;
040        }
041    
042        public Object evaluate(MessageEvaluationContext message) throws JMSException {
043            return message.getMessage().getHeader(name);
044        }
045    
046        public Object evaluate(Message message) {
047            return message.getHeader(name);
048        }
049    
050        public String getName() {
051            return name;
052        }
053    
054    
055        /**
056         * @see java.lang.Object#toString()
057         */
058        @Override
059        public String toString() {
060            return name;
061        }
062    
063        /**
064         * @see java.lang.Object#hashCode()
065         */
066        @Override
067        public int hashCode() {
068            return name.hashCode();
069        }
070    
071        /**
072         * @see java.lang.Object#equals(java.lang.Object)
073         */
074        @Override
075        public boolean equals(Object o) {
076    
077            if (o == null || !this.getClass().equals(o.getClass())) {
078                return false;
079            }
080            return name.equals(((PropertyExpression) o).name);
081    
082        }
083    
084    }