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 a filter using an expression 027 * 028 * @version $Revision: 1.1.1.1 $ 029 */ 030 public class ExpressionFilter implements Filter { 031 032 private Expression expression; 033 034 public ExpressionFilter(Expression expression) { 035 this.expression = expression; 036 } 037 038 public boolean matches(Message message) throws JMSException { 039 Object value = expression.evaluate(message); 040 if (value != null && value instanceof Boolean) { 041 return ((Boolean) value).booleanValue(); 042 } 043 return false; 044 } 045 046 public boolean isWildcard() { 047 return false; 048 } 049 050 /** 051 * @return Returns the expression. 052 */ 053 public Expression getExpression() { 054 return expression; 055 } 056 057 /* (non-Javadoc) 058 * @see java.lang.Object#toString() 059 */ 060 public String toString() { 061 return "Filter: "+expression; 062 } 063 }