Retrieves the text content of the specified sub element for the given XML element. - Android XML

Android examples for XML:XML Element

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Description

Retrieves the text content of the specified sub element for the given XML element.

Demo Code


//package com.java2s;

import org.w3c.dom.Element;

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

public class Main {
    /**/*from ww  w. j a  v  a 2  s  . c  o  m*/
     * Retrieves the text content of the specified sub element for the given element.
     *
     * @param   elem     The element whose subelement text contents is to be retrieved.
     * @param   tagName  Name of the subelement.
     * @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 String getSubElementContents(Element elem, String tagName) {
        Element child = getChildElement(elem, tagName);
        if (child != null) {
            return child.getTextContent();
        } else {
            return null;
        }
    }

    /**
     * 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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