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Java > Open Source Codes > org > apache > activemq > filter > XQueryExpression


1 /**
2  *
3  * Licensed to the Apache Software Foundation (ASF) under one or more
4  * contributor license agreements. See the NOTICE file distributed with
5  * this work for additional information regarding copyright ownership.
6  * The ASF licenses this file to You under the Apache License, Version 2.0
7  * (the "License"); you may not use this file except in compliance with
8  * the License. You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18 package org.apache.activemq.filter;
19
20 import javax.jms.JMSException JavaDoc;
21
22 /**
23  * Used to evaluate an XQuery Expression in a JMS selector.
24  */
25 public final class XQueryExpression implements BooleanExpression {
26     private final String JavaDoc xpath;
27
28     XQueryExpression(String JavaDoc xpath) {
29         super();
30         this.xpath = xpath;
31     }
32
33     public Object JavaDoc evaluate(MessageEvaluationContext message) throws JMSException JavaDoc {
34         return Boolean.FALSE;
35     }
36
37     public String JavaDoc toString() {
38         return "XQUERY "+ConstantExpression.encodeString(xpath);
39     }
40     
41     /**
42      * @param message
43      * @return true if the expression evaluates to Boolean.TRUE.
44      * @throws JMSException
45      */
46     public boolean matches(MessageEvaluationContext message) throws JMSException JavaDoc {
47         Object JavaDoc object = evaluate(message);
48         return object!=null && object==Boolean.TRUE;
49     }
50
51 }
52
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