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/*
  Copyright 2010 Intalio Inc

  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.jbpm.bpmn2.xpath;

/**
 * A helper utility that modifies XPath Expression in-place.
 */
public class XPATHExpressionModifier {

//	/**
//	 * Creates a new XPATHExpressionModifier object.
//	 *
//	 * @param contextUris
//	 * @param namePool
//	 */
//	public XPATHExpressionModifier() {
//	}
//
//	/**
//	 * Insert nodes into the specified XPath expression wherever
//	 * required 
//	 * 

// * To be precise, a node is added to its parent if: // * a) the node is an element... // * b) that corresponds to an step... // * c) that has a child axis... // * d) whose parent had no children with its name... // * e) and all preceding steps are element name tests. // *

// * @param xpathExpr // * @param namePool // * // * @throws DOMException // * @throws TransformerException // * @throws XPathExpressionException // */ // public Node insertMissingData(String xpath, Node contextNode) // throws DOMException, TransformerException, XPathExpressionException { // if (xpath.startsWith("/") && contextNode == null) { // xpath = xpath.substring(1); // } // Node rootNode = contextNode; // if (contextNode != null) { // contextNode = contextNode.getOwnerDocument(); // } // // XPathFactory xpf = new XPathFactoryImpl(); // XPath xpe = xpf.newXPath(); // XPathExpression xpathExpr = xpe.compile(xpath); // //// if (contextNode == null || !(contextNode instanceof Element) || //// !(xpathExpr instanceof XPathExpressionImpl)) { //// return; //// } // // Expression expression = ((XPathExpressionImpl) xpathExpr).getInternalExpression(); // // Document document = toDOMDocument(contextNode); // // PathExpression pathExpr = null; // Expression step = null; // // if (expression instanceof PathExpression) { // pathExpr = (PathExpression) expression; // step = pathExpr.getFirstStep(); // } else if (expression instanceof AxisExpression) { // pathExpr = null; // step = (AxisExpression) expression; // } else { // return contextNode; // } // // while (step != null) { // if (step instanceof AxisExpression) { // AxisExpression axisExpr = (AxisExpression) step; // // NodeTest nodeTest = axisExpr.getNodeTest(); // // if (!(nodeTest instanceof NameTest)) { // break; // } // // NameTest nameTest = (NameTest) nodeTest; // // QName childName = getQualifiedName(nameTest.getFingerprint(), // ((XPathFactoryImpl) xpf).getConfiguration().getNamePool()/*, contextUris*/); // // if (Axis.CHILD == axisExpr.getAxis()) { // if (NodeKindTest.ELEMENT.getNodeKindMask() != nameTest.getNodeKindMask()) { // break; // } // if (contextNode == null) { // contextNode = document.createElementNS(childName.getNamespaceURI(), childName.getLocalPart()); // document.appendChild(contextNode); // rootNode = contextNode; // } else { // // NodeList children = null; // if (contextNode instanceof Element) { // children = ((Element) contextNode).getElementsByTagNameNS(childName.getNamespaceURI(), // childName.getLocalPart()); // } else if (contextNode instanceof Document) { // children = ((Document) contextNode).getElementsByTagNameNS(childName.getNamespaceURI(), // childName.getLocalPart()); // } else { // throw new IllegalArgumentException(contextNode + " is of unsupported type"); // } // if ((children == null) || (children.getLength() == 0)) { // Node child = document.createElementNS(childName.getNamespaceURI(), // getQualifiedName(childName)); // Document currentDoc = (Document) (contextNode instanceof Document ? contextNode : contextNode.getOwnerDocument()); // // contextNode.appendChild(currentDoc.importNode(child, true)); // contextNode = child; // } else if (children.getLength() == 1) { // contextNode = children.item(0); // } else { // break; // } // } // } else if (Axis.ATTRIBUTE == axisExpr.getAxis()) { // if (NodeKindTest.ATTRIBUTE.getNodeKindMask() != nameTest.getNodeKindMask()) { // break; // } // // Attr attribute = ((Element) contextNode).getAttributeNodeNS(childName.getNamespaceURI(), childName.getLocalPart()); // if (attribute == null) { // attribute = document.createAttributeNS(childName.getNamespaceURI(), childName.getLocalPart()); // ((Element) contextNode).setAttributeNode(attribute); // contextNode = attribute; // } else { // break; // } // // } else { // break; // } // // // } else if (step instanceof ItemChecker) { // ItemChecker itemChecker = (ItemChecker) step; // Expression baseExpr = itemChecker.getBaseExpression(); // // if (!(baseExpr instanceof VariableReference)) { // break; // } // } else { // break; // } // // if (pathExpr != null) { // Expression remainingSteps = pathExpr.getRemainingSteps(); // // if (remainingSteps instanceof PathExpression) { // pathExpr = (PathExpression) remainingSteps; // step = pathExpr.getFirstStep(); // } else if (remainingSteps instanceof AxisExpression) { // pathExpr = null; // step = (AxisExpression) remainingSteps; // } else { // throw new RuntimeException("Not supported step " + remainingSteps + " in expression " + expression); // } // } else { // break; // } // } // return rootNode; // } // // /** // * Create the QName by running the given finger print against the // * given context // * // * @param fingerprint // * @param namePool // * @param nsContext // * // * @return The QName corresponding to the finger print // */ // private QName getQualifiedName(int fingerprint, NamePool namePool) { // String localName = namePool.getLocalName(fingerprint); // String prefix = namePool.getPrefix(fingerprint); // String uri = namePool.getURI(fingerprint); // // // Unfortunately, NSContext.getPrefix(String URI) doesn't always work // // So, we need to find the prefix for the URI the hard way // // if ((prefix == null) || "".equals(prefix)) { // // for (String nsPrefix : nsContext.getPrefixes()) { // // String nsUri = nsContext.getNamespaceURI(nsPrefix); // // // // if (nsUri.equals(uri)) { // // prefix = nsPrefix; // // } // // } // // } // // return new QName(uri, localName, prefix); // } // // public static Document toDOMDocument(Node node) throws TransformerException { // // If the node is the document, just cast it // if (node instanceof Document) { // return newDocument(); // // If the node is an element // } else if (node instanceof Element) { // Element elem = (Element) node; // // If this is the root element, return its owner document // // if (elem.getOwnerDocument().getDocumentElement() == elem) { // return elem.getOwnerDocument(); // // else, create a new doc and copy the element inside it // // } else { // // Document doc = newDocument(); // // doc.appendChild(doc.importNode(node, true)); // // return doc; // // } // // other element types are not handled // } else if (node == null) { // return newDocument(); // } else { // throw new TransformerException("Unable to convert DOM node to a Document"); // } // } // // public static Document newDocument() { // try { // DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder(); // return db.newDocument(); // } catch (ParserConfigurationException e) { // // __log.error(e); // throw new RuntimeException(e); // } // } // // public static String getQualifiedName(QName qName) { // String prefix = qName.getPrefix(), localPart = qName.getLocalPart(); // return (prefix == null || "".equals(prefix)) ? localPart : (prefix + ":" + localPart); // } }




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