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/*******************************************************************************
* Copyright (c) 2005 Oracle Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Ian Trimble - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.pagedesigner.dtmanager.converter.operations.internal;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.eclipse.jst.pagedesigner.dtmanager.converter.operations.AbstractTransformOperation;
import org.w3c.dom.Element;
import org.w3c.dom.Text;
/**
* ITransformOperation implementation that creates a new child Text node by
* getting a value from the specified XPath expression.
*
* <br><b>Note:</b> requires ITransformOperation.setTagConverterContext(...) to
* have been called to provide a valid ITagConverterContext instance prior to
* a call to the transform(...) method.
*
* @author Ian Trimble - Oracle
*/
public class AppendChildTextFromXPathOperation extends AbstractTransformOperation {
private String xPathExpression;
/**
* Constructs an instance with the specified XPath expression.
*
* @param xPathExpression XPath expression to be evaluated against the
* source Element instance.
*/
public AppendChildTextFromXPathOperation(String xPathExpression) {
this.xPathExpression = xPathExpression;
}
/*
* (non-Javadoc)
* @see org.eclipse.jst.pagedesigner.dtmanager.converter.operations.internal.provisional.AbstractTransformOperation#transform(org.w3c.dom.Element, org.w3c.dom.Element)
*/
public Element transform(Element srcElement, Element curElement) {
if (srcElement != null) {
XPath xPath = XPathFactory.newInstance().newXPath();
try {
Object resultObject = xPath.evaluate(xPathExpression, srcElement, XPathConstants.STRING);
if (tagConverterContext != null && resultObject instanceof String && curElement != null) {
Text childText = tagConverterContext.createText((String)resultObject);
curElement.appendChild(childText);
}
} catch(XPathExpressionException xee) {
//could not evaluate - return curElement
}
}
return curElement;
}
}
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