Retrieves an XML element from the given start node by following the specified sequential path of elements. - Java XML

Java examples for XML:DOM Node

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Description

Retrieves an XML element from the given start node by following the specified sequential path of elements.

Demo Code


//package com.java2s;

import org.w3c.dom.Element;

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

public class Main {
    /**/*from   w w  w.j a  va2 s  .  c o  m*/
     * Retrieves an XML element from the given start node by following the specified
     * sequential path of elements.
     *
     * @param   start  The context node from which the path is to be evaluated.
     * @param   path   A list element names that defines the path to the target element.
     * @return  The element at the end of the path or null if the path does not exist.
     */
    public static Element getElementByPath(Element start, String... path) {
        Element contextNode = start;
        int index = 0;
        while (index < path.length && contextNode != null) {
            contextNode = getChildElement(contextNode, path[index++]);
        }
        return contextNode;
    }

    /**
     * Retrieves the child element with the specified tag name for the given element.
     *
     * @param   elem     The element whose child element is to be retrieved.
     * @param   tagName  Name of the child element.
     * @pre     elem != null && tagName != null && !tagName.equals("")
     * @return  The text contents of the specified sub element, or null if the subelement
     *          does not exist.
     */
    public static Element getChildElement(Element elem, String tagName) {
        NodeList children = elem.getChildNodes();
        Element childElement = null;
        int index = 0;
        while (childElement == null && index < children.getLength()) {
            Node child = children.item(index);
            if (child.getNodeType() == Node.ELEMENT_NODE
                    && ((Element) child).getTagName().equals(tagName)) {
                childElement = (Element) child;
            } else {
                index++;
            }
        }
        return childElement;
    }
}

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