Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.io.File;

import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;

import org.xml.sax.SAXException;

public class Main {
    private static DocumentBuilderFactory documentBuilderFactory;
    private static DocumentBuilder documentBuilder;

    public static int countChildNodes(String fileName) {
        Document doc = parseFile(fileName);
        return doc.getFirstChild().getChildNodes().getLength();
    }

    public static Document parseFile(String fileName) {
        System.out.println("Parsing XML file... " + fileName);

        if (documentBuilder == null) {
            refreshDocumentBuilder();
        }

        File sourceFile = new File(fileName);

        try {
            return documentBuilder.parse(sourceFile);
        } catch (SAXException e) {
            System.out.println("Wrong XML file structure: " + e.getMessage());
            return null;
        } catch (IOException e) {
            System.out.println("Could not read source file: " + e.getMessage());
        }

        return null;
    }

    public static void refreshDocumentBuilder() {
        if (documentBuilderFactory == null) {
            refreshDocumentBuilderFactory();
        }

        try {
            documentBuilder = documentBuilderFactory.newDocumentBuilder();
        } catch (ParserConfigurationException e) {
            System.out.println("Wrong parser configuration: " + e.getMessage());
        }
    }

    public static void refreshDocumentBuilderFactory() {
        documentBuilderFactory = DocumentBuilderFactory.newInstance();
    }
}