Java XPath Create getXPath(Node node)

Description

Create a XPath expression denoting the node's absolute position.

License

Open Source License

Declaration

public static String getXPath(Node node) 

Method Source Code

//package com.java2s;
/*/*from w ww.j  a va2s  .c o m*/
 * This file is part of Pustefix.
 *
 * Pustefix is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Pustefix is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Pustefix; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

import org.w3c.dom.Attr;

import org.w3c.dom.Element;
import org.w3c.dom.Node;

public class Main {
    /**
     * Create a XPath expression denoting the node's absolute position.
     */
    public static String getXPath(Node node) {
        StringBuilder sb = new StringBuilder();
        buildXPath(node, sb);
        return sb.toString();
    }

    /**
     * Build XPath expression by bottom-up traversing the node's ancestors.
     */
    private static void buildXPath(Node node, StringBuilder builder) {
        if (node != null) {
            if (node.getNodeType() == Node.ELEMENT_NODE) {
                Element elem = (Element) node;
                Node parentNode = elem.getParentNode();
                if (parentNode != null && parentNode.getNodeType() == Node.ELEMENT_NODE) {
                    int pos = 1;
                    Node prevNode = elem.getPreviousSibling();
                    while (prevNode != null) {
                        if (prevNode.getNodeType() == Node.ELEMENT_NODE) {
                            if (prevNode.getNodeName().equals(elem.getNodeName()))
                                pos++;
                        }
                        prevNode = prevNode.getPreviousSibling();
                    }
                    builder.insert(0, "/" + elem.getNodeName() + "[" + pos + "]");
                    buildXPath(parentNode, builder);
                } else {
                    builder.insert(0, "/" + elem.getNodeName());
                }
            } else if (node.getNodeType() == Node.ATTRIBUTE_NODE) {
                builder.insert(0, "/@" + node.getNodeName());
                buildXPath(((Attr) node).getOwnerElement(), builder);
            } else if (node.getNodeType() == Node.TEXT_NODE) {
                int pos = 1;
                Node prevNode = node.getPreviousSibling();
                while (prevNode != null) {
                    if (prevNode.getNodeType() == Node.TEXT_NODE)
                        pos++;
                    prevNode = prevNode.getPreviousSibling();
                }
                builder.insert(0, "/text()[" + pos + "]");
                buildXPath(node.getParentNode(), builder);
            }
        }
    }
}

Related

1. getXPath(Node n)
2. getXPath(Node n)
3. getXPath(Node n)
4. getXPath(Node n)
5. getXPath(Node node)
6. getXPath(Node node)
7. getXPath(Node node, String xpath)
8. getXPath(String exp, NamespaceContext ctx)
9. getXPath(String expression)