XPathPredicate


1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.servicemix.eip.support;
18  
19  import javax.jbi.messaging.MessageExchange;
20  import javax.jbi.messaging.NormalizedMessage;
21  
22  import org.apache.commons.logging.Log;
23  import org.apache.commons.logging.LogFactory;
24  import org.apache.servicemix.expression.JAXPBooleanXPathExpression;
25  import org.apache.servicemix.jbi.util.MessageUtil;
26  
27  /**
28   * @author gnodet
29   * @version $Revision: 376451 $
30   * @org.apache.xbean.XBean element="xpath-predicate"
31   */
32  public class XPathPredicate extends JAXPBooleanXPathExpression implements Predicate {
33  
34      private static final Log log = LogFactory.getLog(XPathPredicate.class);
35      
36      public XPathPredicate() {
37      }
38      
39      public XPathPredicate(String   xpath) throws Exception   {
40          super(xpath);
41      }
42      
43      /* (non-Javadoc)
44       * @see org.apache.servicemix.components.eip.RoutingRule#matches(javax.jbi.messaging.MessageExchange)
45       */
46      public boolean matches(MessageExchange exchange) {
47          try {
48              NormalizedMessage in = MessageUtil.copyIn(exchange);
49              Boolean   match = (Boolean  ) evaluate(exchange, in);
50              return Boolean.TRUE.equals(match);
51          } catch (Exception   e) {
52              log.warn("Could not evaluate xpath expression", e);
53              return false;
54          }
55      }
56  
57  }
58
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