Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

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

public class Main {
    /**
     * Gets the value from the first descendant of a given ancestor, where the
     * descendant has the specified name.
     * 
     * @param ancestor
     *            the ancestor element
     * @param tagname
     *            the tag name of the descendant to find.
     * @return the value of the descendant or <code>null</code> if no descendant
     *         with that name could be found or the descendant found has no
     *         value.
     */
    public static String getValueFromDescendant(Element ancestor, String tagname) {
        if (ancestor != null) {
            NodeList nl = ancestor.getElementsByTagName(tagname);
            if (!isEmpty(nl)) {
                Element e = (Element) nl.item(0);
                Node c = e.getFirstChild();
                if (c != null) {
                    return c.getNodeValue();
                }
            }
        }
        return null;
    }

    /**
     * Gets the value from the first descendant of a given ancestor, where the
     * descendant has the specified name.
     * 
     * @param ancestor
     *            the ancestor element
     * @param tagname
     *            the tag name of the descendant to find.
     * @param defaultString
     *            a default string to return if the value found is
     *            <code>null</code>.
     * @return the value of the descendant or <code>null</code> if no descendant
     *         with that name could be found or the descendant found has no
     *         value.
     */
    public static String getValueFromDescendant(Element ancestor, String tagname, String defaultString) {
        String val = getValueFromDescendant(ancestor, tagname);
        return (val != null) ? val : defaultString;
    }

    /**
     * Null-safe check if a nodelist is empty.
     * 
     * @param nodeList
     *            the nodelist to check.
     * @return <code>true</code> if the given nodelist is <code>null</code> or
     *         empty.
     */
    public static boolean isEmpty(NodeList nodeList) {
        return nodeList == null || nodeList.getLength() == 0;
    }
}