/**
*
* Copyright 2005 LogicBlaze, Inc. http://www.logicblaze.com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
**/
package org.servicemix.expression;
import org.apache.xmlbeans.XmlException;
import org.apache.xmlbeans.XmlObject;
import org.apache.xmlbeans.XmlOptions;
import org.apache.xmlbeans.XmlSaxHandler;
import org.servicemix.jbi.jaxp.SourceTransformer;
import javax.jbi.messaging.MessageExchange;
import javax.jbi.messaging.MessagingException;
import javax.jbi.messaging.NormalizedMessage;
import javax.xml.transform.TransformerException;
import javax.xml.transform.sax.SAXResult;
/**
* An {@link Expression} which evaluates an XPath expression using <a href="http://xmlbeans.apache.org/">XMLBeans</a>
*
* @version $Revision: 221 $
*/
public class XMLBeansXPathExpression implements Expression {
private String xpath;
private XmlOptions options = new XmlOptions();
private SourceTransformer transformer = new SourceTransformer();
public XMLBeansXPathExpression(String xpath) {
this.xpath = xpath;
}
public Object evaluate(MessageExchange exchange, NormalizedMessage message) throws MessagingException {
try {
XmlSaxHandler handler = XmlObject.Factory.newXmlSaxHandler();
SAXResult result = new SAXResult(handler.getContentHandler());
transformer.toResult(message.getContent(), result);
XmlObject object = handler.getObject();
return evaluateXPath(object, xpath, options);
}
catch (TransformerException e) {
throw new MessagingException(e);
}
catch (XmlException e) {
throw new MessagingException(e);
}
}
protected Object evaluateXPath(XmlObject object, String xpath, XmlOptions options) {
XmlObject[] xmlObjects = object.selectPath(this.xpath, this.options);
if (xmlObjects.length == 1) {
return xmlObjects[0];
}
return xmlObjects;
}
}