/*
* $Id: XPathNodeExpressionEvaluator.java 21676 2011-04-09 19:12:32Z dirk.olmes $
* --------------------------------------------------------------------------------------
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
*
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.module.xml.expression;
import org.mule.api.expression.ExpressionRuntimeException;
import org.mule.module.xml.i18n.XmlMessages;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.w3c.dom.Document;
/**
* Will select the text of a single node based on the property name
*/
public class XPathNodeExpressionEvaluator extends XPathExpressionEvaluator
{
public static final String NAME = "xpath-node";
private DocumentBuilder builder;
public XPathNodeExpressionEvaluator()
{
try
{
builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
}
catch (ParserConfigurationException e)
{
throw new ExpressionRuntimeException(XmlMessages.failedToCreateDocumentBuilder(), e);
}
}
@Override
protected Object extractResultFromNode(Object result)
{
if (result instanceof Element)
{
((Element) result).detach();
return DocumentHelper.createDocument((Element) result);
}
else if (result instanceof org.w3c.dom.Element)
{
return extractW3CElement(result);
}
else
{
return result;
}
}
protected Object extractW3CElement(Object result)
{
org.w3c.dom.Element element = (org.w3c.dom.Element) result;
Document doc = builder.newDocument();
doc.appendChild(doc.importNode(element, true));
return doc;
}
/**
* {@inheritDoc}
*/
@Override
public String getName()
{
return NAME;
}
}