Working with SAX (Using Attributes) (3)

   import org.xml.sax.*;
   import org.xml.sax.helpers.DefaultHandler;
   import org.apache.xerces.parsers.SAXParser;

   public class SaxFigures extends DefaultHandler
   {
       public void startElement(String uri, String localName, String rawName,
                                Attributes attributes)
       {
          if(localName.equals("circle"))
          {
             String sr = attributes.getValue("r");
             float radius = Float.valueOf(sr).floatValue();
             float area = (float)Math.PI*radius*radius;
             System.out.println("Circle : Radius = " + radius + 
                                " Area = " + area);
          }
          else if(localName.equals("ellipse"))
          {
             String sw = attributes.getValue("w");
             String sh = attributes.getValue("h");
             float width = Float.valueOf(sw).floatValue();
             float height = Float.valueOf(sh).floatValue();
             float area = (float)Math.PI*(width/2)*(height/2);
             System.out.println("Ellipse : Width = " + width + 
                                " Height = " + height + 
                                " Area = " + area);
          }
          else if(localName.equals("rectangle"))
          {
             String sh = attributes.getValue("h");
             String sw = attributes.getValue("w");
             float width = Float.valueOf(sw).floatValue();
             float height = Float.valueOf(sh).floatValue();
             float area = width * height;
             System.out.println("Rectangle : Width = " + width +
                                " Height = " + height + 
                                " Area = " + area);
          }
      }

      public static void main(String[] args)
      {
         try{
            SaxFigures SAXHandler = new SaxFigures();
            SAXParser parser = new SAXParser();
            parser.setContentHandler(SAXHandler);
            parser.setErrorHandler(SAXHandler);
            parser.parse(args[0]);
         }
         catch(Exception e){
            e.printStackTrace(System.err);
         }
      }
   }