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


public class SAXDemo extends DefaultHandler {

	String prefix = "..........................";
	int depth = 0;
	StringBuffer textBuffer;

	public static void main(String argv[]) {
		if (argv.length != 1) {
			System.err.println("Usage: cmd filename");
			System.exit(1);
		}

		// Use an instance of ourselves as the SAX event handler
		DefaultHandler handler = new SAXDemo();
		// Use the default (non-validating) parser
		SAXParserFactory factory = SAXParserFactory.newInstance();

		try {
			// Parse the input
			SAXParser saxParser = factory.newSAXParser();
			saxParser.parse( new File(argv[0]), handler );
		}
		catch (Throwable t) {
			t.printStackTrace();
		}

   }

  public void startElement(
	  String namespaceURI,
     String sName, // simple name
     String qName, // qualified name
     Attributes attrs)
  throws SAXException {
	  depth++;
	  System.out.print(prefix.substring(0, depth));
	  System.out.println(qName + " node detected");
	  // System.out.println(sName + " = sname");
	  int n = attrs.getLength();
	  for(int i = 0; i < n; i++) {
		  depth++;
		  System.out.print(prefix.substring(0, depth));
		  System.out.println("attribute node: (" + attrs.getQName(i) + ", " + attrs.getValue(i) + ")");
		  depth--;
	  }
  }

  public void endElement(
	  String namespaceURI,
     String sName, // simple name
     String qName  // qualified name
     )
  throws SAXException {
	  if (textBuffer != null) {
		  String s = ""+textBuffer;
		  s = s.trim();
        if (!s.equals("")) {
			  depth++;
			  System.out.print(prefix.substring(0, depth));
	        System.out.println("text node: " + s);
	        depth--;
		  }
	     textBuffer = null;
	  }
	  depth--;
	  //System.out.println("===================");
  }



  public void characters(char buf[], int offset, int len)
  throws SAXException
  {
        String s = new String(buf, offset, len);
	     if (textBuffer == null) {
	       textBuffer = new StringBuffer(s);
	     } else {
	       textBuffer.append(s);
    }
  }
}