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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.Node;
import org.w3c.dom.NodeList;
/**
* ITransformOperation implementation that executes child ITransformOperation
* instances for each Element in the NodeList returned by the XPath expression,
* which is evaluated against the source Element.
*
* <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 IterateOverElementsOperation 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 IterateOverElementsOperation(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) {
Element retElement = curElement;
if (srcElement != null) {
XPath xPath = XPathFactory.newInstance().newXPath();
try {
Object resultObject = xPath.evaluate(xPathExpression, srcElement, XPathConstants.NODESET);
if (resultObject instanceof NodeList) {
NodeList nodes = (NodeList)resultObject;
for (int i = 0; i < nodes.getLength(); i++) {
Node node = nodes.item(i);
if (node instanceof Element) {
retElement = executeChildOperations((Element)node, retElement);
}
}
}
} catch(XPathExpressionException xee) {
//could not evaluate - return curElement
}
}
return retElement;
}
}
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