public class ByteDataHandler implements DataHandler {

   public Object handleParam(InputStream in) {
      return new Byte(in.read());
   }
}

public class StringDataHandler implements DataHandler {

   public Object handleParam(InputStream in) {
       StringBuffer strBuffer = new StringBuffer();
       while ((int read = in.read()) != 0) {
 		strBuffer.append((char)read);
       }
       return strBuffer.toString();
   }
}

public class LongDataHandler implements DataHandler {
  // implementation here
}