Java XPath Create getXPathToContent(final Node root, final String selectedContent)

Description

Determines the XPath expression to the selected character data (element content).

License

Open Source License

Parameter

Parameter	Description
root	The root element of the XML document
selectedContent	The selected character data

Return

The XPath expression to the selected character data

Declaration

private static String getXPathToContent(final Node root, final String selectedContent) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2009 Dominik Schadow - http://www.xml-sicherheit.de 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: Dominik Schadow - initial API and implementation
 *******************************************************************************/

import org.w3c.dom.Document;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class Main {
    /** Contains the XPath to the selected element content. */
    private static String xpathExpressionToContent = null;

    /**/*from   w  ww . jav  a2  s  .  c  om*/
     * Determines the XPath expression to the selected character data (element content). The first
     * matching content is used, so this XPath may point to another element content.
     *
     * @param root The root element of the XML document
     * @param selectedContent The selected character data
     * @return The XPath expression to the selected character data
     */
    private static String getXPathToContent(final Node root, final String selectedContent) {
        NodeList childList = root.getChildNodes();
        Node childNode = null;

        for (int i = 0, length = childList.getLength(); i < length && xpathExpressionToContent == null; i++) {
            childNode = childList.item(i);
            if (childNode.getNodeType() == Node.TEXT_NODE) {
                if (childNode.getTextContent().equals(selectedContent)) {
                    xpathExpressionToContent = getXPathExpression(childNode.getParentNode());
                }
            }
            getXPathToContent(childNode, selectedContent);
        }

        return xpathExpressionToContent + "/text()"; //$NON-NLS-1$
    }

    /**
     * Returns the unique XPath expression for the given node.
     *
     * @param node The node to determine the XPath for
     * @return The XPath expression as string
     */
    private static String getXPathExpression(final Node node) {
        String xpathExpression = node.getNodeName();

        if (node.getParentNode() != null) {
            int index = 0;
            Node prec = node;

            while (prec != null) {
                if (prec.getNodeName().equals(node.getNodeName())) {
                    index++;
                }
                prec = prec.getPreviousSibling();
            }

            if (node.getParentNode() instanceof Document) {
                ; // do nothing
            } else {
                xpathExpression = getXPathExpression(node.getParentNode()) + "/" + xpathExpression //$NON-NLS-1$
                        + "[" + String.valueOf(index) + "]"; //$NON-NLS-1$ //$NON-NLS-2$
            }
        }

        return xpathExpression;
    }
}

Related

1. getXPathFromVector(Vector path)
2. getXPathListForNode(Node n)
3. getXPathNoCache(String exp)
4. getXPathNodeIndex(Node node, boolean ignoreWhitespace)
5. getXPathNodes(XPath xpath, Object inic, String name)
6. getXPathType(Class c)
7. getXpathVal(InputStream pInputStream, String pXPath)
8. getXPathValue(XPath xpath, Node d, String xq, String def)
9. newXPath()