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 */
022package org.granite.gravity.selector;
023
024import java.io.IOException;
025
026import javax.jms.JMSException;
027
028import org.apache.activemq.command.Response;
029import org.apache.activemq.filter.BooleanExpression;
030import org.apache.activemq.filter.MessageEvaluationContext;
031import org.apache.activemq.selector.SelectorParser;
032import org.apache.activemq.state.CommandVisitor;
033
034import flex.messaging.messages.Message;
035
036/**
037 * @author William DRAI
038 */
039public class ActiveMQMessageSelector implements MessageSelector {
040
041    private BooleanExpression expression;
042
043
044    public ActiveMQMessageSelector(String selector) {
045        try {
046            this.expression = SelectorParser.parse(selector);
047        }
048        catch (Exception e) {
049            throw new RuntimeException("ActiveMQ SelectorParser error " + selector, e);
050        }
051    }
052
053    public boolean accept(Message message) {
054        try {
055            MessageEvaluationContext context = new MessageEvaluationContext();
056            MessageAdapter ma = new MessageAdapter(message);
057            context.setMessageReference(ma);
058
059            return expression.matches(context);
060        }
061        catch (Exception e) {
062            throw new RuntimeException("ActiveMQ selector accept error " + message, e);
063        }
064    }
065
066
067    private static class MessageAdapter extends org.apache.activemq.command.Message {
068        private Message message = null;
069
070        public MessageAdapter(Message message) {
071            this.message = message;
072        }
073
074        @Override
075        public Object getProperty(String name) throws IOException {
076            return message.getHeader(name);
077        }
078
079        @Override
080        public org.apache.activemq.command.Message copy() {
081            return null;
082        }
083
084        public Response visit(CommandVisitor visitor) throws Exception {
085            return null;
086        }
087
088        public byte getDataStructureType() {
089            return 0;
090        }
091
092                @Override
093                public void clearBody() throws JMSException {
094                }
095
096                @Override
097                public void storeContent() {    // Since ActiveMQ 5.7
098                }
099    }
100}