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 }