code: protected Integer parseIntArg(int index, Integer defaultValue) {
          Integer result = defaultValue;
          try {
              String argValue = getStringArg(index);
              if (argValue != null && !"".equals(argValue)) {
                  result = Integer.valueOf(argValue);
              }
          } catch (NumberFormatException e) {
              // don't show just ignore, we will return null
          }
          return result;
      }
docs: Gets fixture parameter (i.e. extra column in header row).
  Please note this can not be called from a constructor, as the parameters will not have been initialized yet!
  @param index index (zero based) to get value from.
  @param defaultValue value to use if parameter is not present or was no int.
  @return parameter value, if present and an integer, defaultValue otherwise.