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    /**
026     * Represents an expression
027     * 
028     * @version $Revision: 1.1.1.1 $
029     */
030    public interface Expression {
031    
032        /**
033         * @return the value of this expression
034         */
035        public Object evaluate(Message message) throws JMSException;
036    
037    }