001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. 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 */ 017package org.apache.activemq.filter; 018 019import javax.jms.JMSException; 020 021/** 022 * Used to evaluate an XQuery Expression in a JMS selector. 023 */ 024public final class XQueryExpression implements BooleanExpression { 025 private final String xpath; 026 027 XQueryExpression(String xpath) { 028 super(); 029 this.xpath = xpath; 030 } 031 032 public Object evaluate(MessageEvaluationContext message) throws JMSException { 033 return Boolean.FALSE; 034 } 035 036 public String toString() { 037 return "XQUERY " + ConstantExpression.encodeString(xpath); 038 } 039 040 /** 041 * @param message 042 * @return true if the expression evaluates to Boolean.TRUE. 043 * @throws JMSException 044 */ 045 public boolean matches(MessageEvaluationContext message) throws JMSException { 046 Object object = evaluate(message); 047 return object != null && object == Boolean.TRUE; 048 } 049 050}