code: public int getMinimumDigits() {
          String value = Optional.fromNullable(getParameter(SignalParameters.MINIMUM_NUM_DIGITS.symbol())).or("1");
          return Integer.parseInt(value);
      }
docs: The minimum number of digits to collect.
  <p>
  <b>Defaults to one.</b> This parameter should not be specified if the Digit Pattern parameter is present.
  </p>
  
  @return