code: public static final KeyPressHandler getNumericAndUpperAsciiKeyPressHandler() { // NOPMD
      if (HandlerFactory.numericAndUpperAsciiKeyPressHandler == null) {
        synchronized (NumericAndUpperAsciiKeyPressHandler.class) {
          if (HandlerFactory.numericAndUpperAsciiKeyPressHandler == null) {
            HandlerFactory.numericAndUpperAsciiKeyPressHandler =
                new NumericAndUpperAsciiKeyPressHandler();
          }
        }
      }
      return HandlerFactory.numericAndUpperAsciiKeyPressHandler;
    }
docs: get a numeric and upper case key press handler.
  
  @return NumericAndUpperAsciiKeyPressHandler