Count the DOM element nodes before the supplied node, having the specified tag name, not including the node itself. - Java XML

Java examples for XML:XML Node

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Description

Count the DOM element nodes before the supplied node, having the specified tag name, not including the node itself.

Demo Code

// This library is free software; you can redistribute it and/or
//package com.java2s;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class Main {
    /**//  w  ww .ja v  a  2s. com
     * Count the DOM element nodes before the supplied node, having the specified
     * tag name, not including the node itself.
     * <p/>
     * Counts the sibling nodes.
     *
     * @param node    Node whose element siblings are to be counted.
     * @param tagName The tag name of the sibling elements to be counted.
     * @return The number of siblings elements before the supplied node with the
     *         specified tag name.
     */
    public static int countElementsBefore(Node node, String tagName) {
        Node parent = node.getParentNode();

        NodeList siblings = parent.getChildNodes();
        int count = 0;
        int siblingCount = siblings.getLength();

        for (int i = 0; i < siblingCount; i++) {
            Node sibling = siblings.item(i);

            if (sibling == node) {
                break;
            }
            if (sibling.getNodeType() == Node.ELEMENT_NODE
                    && ((Element) sibling).getTagName().equals(tagName)) {
                count++;
            }
        }

        return count;
    }
}

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