import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;
import javax.xml.parsers.*;
import java.io.*;

public class ch12_04 extends DefaultHandler 
{
    static String displayStrings[] = new String[1000];
    static int numberDisplayLines = 0;
    static String indent = "";
    static boolean printFlag;
    static String searchFor;

    public void displayDocument(String uri) 
    {
        DefaultHandler handler = this;
        SAXParserFactory factory = SAXParserFactory.newInstance();
        try {
            SAXParser saxParser = factory.newSAXParser();
            saxParser.parse(new File(uri), handler);
        } catch (Throwable t) {}
    } 

    public void processingInstruction(String target, String data) 
    {
        if(printFlag){
            displayStrings[numberDisplayLines] = indent;
            displayStrings[numberDisplayLines] += "<?";
            displayStrings[numberDisplayLines] += target;
            if (data != null && data.length() > 0) {
                displayStrings[numberDisplayLines] += ' ';
                displayStrings[numberDisplayLines] += data;
            }
            displayStrings[numberDisplayLines] += "?>";
            numberDisplayLines++;
        }
    } 

    public void startDocument() 
    {
        if(printFlag){
            displayStrings[numberDisplayLines] = indent;
            displayStrings[numberDisplayLines] += "<?xml version=\"1.0\" encoding=\""+
                "UTF-8" + "\"?>";
            numberDisplayLines++;
        }
    } 

    public void startElement(String uri, String localName, String qualifiedName, Attributes attributes) 
    {
        if(qualifiedName.equals(searchFor)){
            printFlag=true;
        }

        if (printFlag){
            displayStrings[numberDisplayLines] = indent;
        
            indent += "    ";

            displayStrings[numberDisplayLines] += '<';
            displayStrings[numberDisplayLines] += qualifiedName;
            if (attributes != null) {
                int numberAttributes = attributes.getLength();
                for (int loopIndex = 0; loopIndex < numberAttributes; loopIndex++) {
                    displayStrings[numberDisplayLines] += ' ';
                    displayStrings[numberDisplayLines] += attributes.getLocalName(loopIndex);
                    displayStrings[numberDisplayLines] += "=\"";
                    displayStrings[numberDisplayLines] += attributes.getValue(loopIndex);
                    displayStrings[numberDisplayLines] += '"';
                }
            }
            displayStrings[numberDisplayLines] += '>';
            numberDisplayLines++;
        }
    } 

    public void characters(char characters[], int start, int length) {
        if(printFlag){
            String characterData = (new String(characters, start, length)).trim();
            if(characterData.indexOf("\n") < 0 && characterData.length() > 0) {
                displayStrings[numberDisplayLines] = indent;
                displayStrings[numberDisplayLines] += characterData;
                numberDisplayLines++;
            }
        }
    } 

    public void ignorableWhitespace(char characters[], int start, int length) 
    {
        if(printFlag){
            //characters(ch, start, length);
        }
    } 

    public void endElement(String uri, String localName, String qualifiedName) 
    {
        if(printFlag){
            indent = indent.substring(0, indent.length() - 4);
            displayStrings[numberDisplayLines] = indent;
            displayStrings[numberDisplayLines] += "</";
            displayStrings[numberDisplayLines] += qualifiedName;
            displayStrings[numberDisplayLines] += '>';
            numberDisplayLines++;
        }
        if(qualifiedName.equals(searchFor)){
            printFlag=false;
        }
    } 

    public void warning(SAXParseException exception) 
    {
        System.err.println("WARNING! " +
            exception.getMessage());
    }

    public void error(SAXParseException exception) 
    {
        System.err.println("ERROR! " +
            exception.getMessage());
    }

    public void fatalError(SAXParseException exception)  
    {
        System.err.println("FATAL ERROR! " +
            exception.getMessage());
    }

    public static void main(String args[]) 
    {
        ch12_04 obj = new ch12_04();
        searchFor = args[1];
        obj.displayDocument(args[0]);

        for(int index = 0; index < numberDisplayLines; index++){
            System.out.println(displayStrings[index]);
        }
    } 
}