Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import java.util.ArrayList;

import java.util.List;

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

public class Main {
    private static final String FULL_XPATH_CACHE = "FULL_XPATH_CACHE";

    /**
     * Reverse Engineers an XPath Expression of a given Node in the DOM.
     * 
     * @param node
     *            the given node.
     * @return string xpath expression (e.g., "/html[1]/body[1]/div[3]").
     */
    public static String getXPathExpression(Node node) {
        Object xpathCache = node.getUserData(FULL_XPATH_CACHE);
        if (xpathCache != null) {
            return xpathCache.toString();
        }
        Node parent = node.getParentNode();

        if ((parent == null) || parent.getNodeName().contains("#document")) {
            String xPath = "/" + node.getNodeName() + "[1]";
            node.setUserData(FULL_XPATH_CACHE, xPath, null);
            return xPath;
        }

        StringBuffer buffer = new StringBuffer();

        if (parent != node) {
            buffer.append(getXPathExpression(parent));
            buffer.append("/");
        }

        buffer.append(node.getNodeName());

        List<Node> mySiblings = getSiblings(parent, node);

        for (int i = 0; i < mySiblings.size(); i++) {
            Node el = mySiblings.get(i);

            if (el.equals(node)) {
                buffer.append('[').append(Integer.toString(i + 1)).append(']');
                // Found so break;
                break;
            }
        }
        String xPath = buffer.toString();
        node.setUserData(FULL_XPATH_CACHE, xPath, null);
        return xPath;
    }

    /**
     * Get siblings of the same type as element from parent.
     * 
     * @param parent
     *            parent node.
     * @param element
     *            element.
     * @return List of sibling (from element) under parent
     */
    public static List<Node> getSiblings(Node parent, Node element) {
        List<Node> result = new ArrayList<Node>();
        NodeList list = parent.getChildNodes();

        for (int i = 0; i < list.getLength(); i++) {
            Node el = list.item(i);

            if (el.getNodeName().equals(element.getNodeName())) {
                result.add(el);
            }
        }

        return result;
    }
}