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XML Pull parser library developed by Extreme Computing Lab, Indiana University
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package org.xmlpull.v1.samples;
/* -*-             c-basic-offset: 4; indent-tabs-mode: nil; -*-  //------100-columns-wide------>|*/
// for license please see accompanying LICENSE.txt file (available also at http://www.xmlpull.org/)

import java.io.FileReader;
import java.io.IOException;
import java.io.StringReader;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;

/**
 * An example of an application that uses XMLPULL V1 API.
 *
 * @author Aleksander Slominski
 */
public class MyXmlPullApp
{

    public final static String SAMPLE_XML =
        "\n"+
        "\n"+
        "\n"+
        "Roses are Red\n"+
        "Roses are red,\n"+
        "Violets are blue;\n"+
        "Sugar is sweet,\n"+
        "And I love you.\n"+
        "";

    public static void main (String args[])
        throws XmlPullParserException, IOException
    {
        XmlPullParserFactory factory = XmlPullParserFactory.newInstance(
            System.getProperty(XmlPullParserFactory.PROPERTY_NAME), null);
        //factory.setNamespaceAware(true);
        factory.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, true);

        XmlPullParser xpp = factory.newPullParser();
        System.out.println("parser implementation class is "+xpp.getClass());

        MyXmlPullApp app = new MyXmlPullApp();

        if(args.length == 0) {
            System.out.println("Parsing simple sample XML");//:\n"+ SAMPLE_XML);
            xpp.setInput( new StringReader( SAMPLE_XML ) );
            app.processDocument(xpp);
        } else {
            for (int i = 0; i < args.length; i++) {
                System.out.println("Parsing file: "+args[i]);
                xpp.setInput ( new FileReader ( args [i] ) );
                //xpp.setInput ( new InputStreamReader( new FileInputStream ( args [i] ) ) );
                //xpp.setInput ( new FileInputStream ( args [i] ), "UTF8"  );
                app.processDocument(xpp);
            }
        }
    }


    public void processDocument(XmlPullParser xpp)
        throws XmlPullParserException, IOException
    {
        int eventType = xpp.getEventType();
        do {
            if(eventType == XmlPullParser.START_DOCUMENT) {
                System.out.println("Start document");
            } else if(eventType == XmlPullParser.END_DOCUMENT) {
                System.out.println("End document");
            } else if(eventType == XmlPullParser.START_TAG) {
                processStartElement(xpp);
            } else if(eventType == XmlPullParser.END_TAG) {
                processEndElement(xpp);
            } else if(eventType == XmlPullParser.TEXT) {
                processText(xpp);
            }
            eventType = xpp.next();
        } while (eventType != XmlPullParser.END_DOCUMENT);
    }


    public void processStartElement (XmlPullParser xpp)
    {
        String name = xpp.getName();
        String uri = xpp.getNamespace();
        if ("".equals (uri)) {
            System.out.println("Start element: " + name);
        } else {
            System.out.println("Start element: {" + uri + "}" + name);
        }
    }


    public void processEndElement (XmlPullParser xpp)
    {
        String name = xpp.getName();
        String uri = xpp.getNamespace();
        if ("".equals (uri))
            System.out.println("End element: " + name);
        else
            System.out.println("End element:   {" + uri + "}" + name);
    }

    int holderForStartAndLength[] = new int[2];

    public void processText (XmlPullParser xpp) throws XmlPullParserException
    {
        char ch[] = xpp.getTextCharacters(holderForStartAndLength);
        int start = holderForStartAndLength[0];
        int length = holderForStartAndLength[1];
        System.out.print("Characters:    \"");
        for (int i = start; i < start + length; i++) {
            switch (ch[i]) {
                case '\\':
                    System.out.print("\\\\");
                    break;
                case '"':
                    System.out.print("\\\"");
                    break;
                case '\n':
                    System.out.print("\\n");
                    break;
                case '\r':
                    System.out.print("\\r");
                    break;
                case '\t':
                    System.out.print("\\t");
                    break;
                default:
                    System.out.print(ch[i]);
                    break;
            }
        }
        System.out.print("\"\n");
    }
}