001    /**
002     *   GRANITE DATA SERVICES
003     *   Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004     *
005     *   This file is part of the Granite Data Services Platform.
006     *
007     *   Granite Data Services is free software; you can redistribute it and/or
008     *   modify it under the terms of the GNU Lesser General Public
009     *   License as published by the Free Software Foundation; either
010     *   version 2.1 of the License, or (at your option) any later version.
011     *
012     *   Granite Data Services is distributed in the hope that it will be useful,
013     *   but WITHOUT ANY WARRANTY; without even the implied warranty of
014     *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015     *   General Public License for more details.
016     *
017     *   You should have received a copy of the GNU Lesser General Public
018     *   License along with this library; if not, write to the Free Software
019     *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020     *   USA, or see <http://www.gnu.org/licenses/>.
021     */
022    package org.granite.gravity.selector;
023    
024    import javax.jms.JMSException;
025    
026    import flex.messaging.messages.Message;
027    
028    /**
029     * Represents a property  expression
030     *
031     * @version $Revision: 1.5 $
032     */
033    public class PropertyExpression implements Expression {
034    
035        interface SubExpression {
036            public Object evaluate(Message message);
037        }
038    
039        private final String name;
040    
041        public PropertyExpression(String name) {
042            this.name = name;
043        }
044    
045        public Object evaluate(MessageEvaluationContext message) throws JMSException {
046            return message.getMessage().getHeader(name);
047        }
048    
049        public Object evaluate(Message message) {
050            return message.getHeader(name);
051        }
052    
053        public String getName() {
054            return name;
055        }
056    
057    
058        /**
059         * @see java.lang.Object#toString()
060         */
061        @Override
062        public String toString() {
063            return name;
064        }
065    
066        /**
067         * @see java.lang.Object#hashCode()
068         */
069        @Override
070        public int hashCode() {
071            return name.hashCode();
072        }
073    
074        /**
075         * @see java.lang.Object#equals(java.lang.Object)
076         */
077        @Override
078        public boolean equals(Object o) {
079    
080            if (o == null || !this.getClass().equals(o.getClass())) {
081                return false;
082            }
083            return name.equals(((PropertyExpression) o).name);
084    
085        }
086    
087    }