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    /**
024     * Represents an expression
025     *
026     * @version $Revision: 1.2 $
027     */
028    public interface Expression {
029    
030        /**
031         * @return the value of this expression
032         */
033        public Object evaluate(MessageEvaluationContext message) throws JMSException;
034    
035    }