Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.util.ArrayList;
import java.util.List;

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

public class Main {
    /** 
     * Gets the value of the child element by tag name under the given parent 
     * element. If there is more than one child element, return the value of the 
     * first one. 
     * 
     * @param parent the parent element 
     * @param tagName the tag name of the child element 
     * @return value of the first child element, NULL if tag not exists 
     */
    public static String getElementValue(Element parent, String tagName) {
        String value = null;

        Element element = getElement(parent, tagName);
        if (element != null) {
            value = element.getTextContent();
        }

        return value;
    }

    /** 
     * Gets the immediately descendant element from the parent element. 
     * 
     * @param parent the parent element in the element tree 
     * @param tagName the specified tag name. 
     * @return immediately descendant element of parent element, NULL otherwise. 
     */
    public static Element getElement(Element parent, String tagName) {
        List<Element> children = getElements(parent, tagName);

        if (children.isEmpty()) {
            return null;
        } else {
            return children.get(0);
        }
    }

    /** 
     * Gets the descendant elements list from the parent element. 
     * 
     * @param parent the parent element in the element tree 
     * @param tagName the specified tag name 
     * @return the NOT NULL descendant elements list 
     */
    public static List<Element> getElements(Element parent, String tagName) {
        NodeList nodes = parent.getElementsByTagName(tagName);
        List<Element> elements = new ArrayList<Element>();

        for (int i = 0; i < nodes.getLength(); i++) {
            Node node = nodes.item(i);
            if (node instanceof Element) {
                elements.add((Element) node);
            }
        }

        return elements;
    }
}