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Java > Open Source Codes > org > apache > servicemix > expression > XMLBeansXPathExpression


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.expression;
18
19 import org.apache.servicemix.jbi.jaxp.SourceTransformer;
20 import org.apache.xmlbeans.XmlException;
21 import org.apache.xmlbeans.XmlObject;
22 import org.apache.xmlbeans.XmlOptions;
23 import org.apache.xmlbeans.XmlSaxHandler;
24
25 import javax.jbi.messaging.MessageExchange;
26 import javax.jbi.messaging.MessagingException;
27 import javax.jbi.messaging.NormalizedMessage;
28 import javax.xml.transform.TransformerException JavaDoc;
29 import javax.xml.transform.sax.SAXResult JavaDoc;
30
31 /**
32  * An {@link Expression} which evaluates an XPath expression using <a HREF="http://xmlbeans.apache.org/">XMLBeans</a>
33  *
34  * @version $Revision: 426415 $
35  */
36 public class XMLBeansXPathExpression implements Expression {
37     private String JavaDoc xpath;
38     private XmlOptions options = new XmlOptions();
39     private SourceTransformer transformer = new SourceTransformer();
40
41     public XMLBeansXPathExpression(String JavaDoc xpath) {
42         this.xpath = xpath;
43     }
44
45     public Object JavaDoc evaluate(MessageExchange exchange, NormalizedMessage message) throws MessagingException {
46         try {
47             XmlSaxHandler handler = XmlObject.Factory.newXmlSaxHandler();
48             SAXResult JavaDoc result = new SAXResult JavaDoc(handler.getContentHandler());
49             transformer.toResult(message.getContent(), result);
50             XmlObject object = handler.getObject();
51             return evaluateXPath(object, xpath, options);
52         }
53         catch (TransformerException JavaDoc e) {
54             throw new MessagingException(e);
55         }
56         catch (XmlException e) {
57             throw new MessagingException(e);
58         }
59     }
60
61     protected Object JavaDoc evaluateXPath(XmlObject object, String JavaDoc xpath, XmlOptions options) {
62         XmlObject[] xmlObjects = object.selectPath(this.xpath, this.options);
63         if (xmlObjects.length == 1) {
64             return xmlObjects[0];
65         }
66         return xmlObjects;
67     }
68 }
69
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