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     */
017    package org.apache.servicemix.eip.support;
018    
019    import javax.jbi.messaging.MessageExchange;
020    import javax.jbi.messaging.NormalizedMessage;
021    
022    import org.apache.commons.logging.Log;
023    import org.apache.commons.logging.LogFactory;
024    import org.apache.servicemix.expression.JAXPBooleanXPathExpression;
025    
026    /**
027     * @author gnodet
028     * @version $Revision: 376451 $
029     * @org.apache.xbean.XBean element="xpath-predicate"
030     */
031    public class XPathPredicate extends JAXPBooleanXPathExpression implements Predicate {
032    
033        private static final Log LOG = LogFactory.getLog(XPathPredicate.class);
034        
035        public XPathPredicate() {
036        }
037        
038        public XPathPredicate(String xpath) throws Exception {
039            super(xpath);
040        }
041        
042        /* (non-Javadoc)
043         * @see org.apache.servicemix.components.eip.RoutingRule#matches(javax.jbi.messaging.MessageExchange)
044         */
045        public boolean matches(MessageExchange exchange) {
046            try {
047                NormalizedMessage in = exchange.getMessage("in");
048                Boolean match = (Boolean) evaluate(exchange, in);
049                return Boolean.TRUE.equals(match);
050            } catch (Exception e) {
051                LOG.warn("Could not evaluate xpath expression", e);
052                return false;
053            }
054        }
055    
056    }