| /******************************************************************************* |
| * 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; |
| |
| /** |
| * ITransformOperation implementation that creates a new attribute on the |
| * current Element by getting a value from the specified XPath expression. |
| * |
| * @author Ian Trimble - Oracle |
| */ |
| public class CreateAttributeFromXPathOperation extends AbstractTransformOperation { |
| |
| private String attributeName; |
| private String xPathExpression; |
| |
| /** |
| * Constructs an instance with the specified XPath expression. |
| * |
| * @param attributeName Name of attribute to be created. |
| * @param xPathExpression XPath expression to be evaluated against the |
| * source Element instance. |
| */ |
| public CreateAttributeFromXPathOperation(String attributeName, String xPathExpression) { |
| this.attributeName = attributeName; |
| 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 (resultObject instanceof String && curElement != null) { |
| curElement.setAttribute(attributeName, (String)resultObject); |
| } |
| } catch(XPathExpressionException xee) { |
| //could not evaluate - return curElement |
| } |
| } |
| return curElement; |
| } |
| |
| } |