docs: @Nonnull
    @ReturnsMutableCopy
    private static ICommonsList <IHolidayParser> _getParsers (@Nonnull final Holidays aConfig)
    {
      final ICommonsList <IHolidayParser> ret = new CommonsArrayList <> ();
      if (!aConfig.getChristianHoliday ().isEmpty ())
        ret.add (ChristianHolidayParser.getInstance ());
      if (!aConfig.getEthiopianOrthodoxHoliday ().isEmpty ())
        ret.add (EthiopianOrthodoxHolidayParser.getInstance ());
      if (!aConfig.getFixed ().isEmpty ())
        ret.add (FixedParser.getInstance ());
      if (!aConfig.getFixedWeekdayBetweenFixed ().isEmpty ())
        ret.add (FixedWeekdayBetweenFixedParser.getInstance ());
      if (!aConfig.getFixedWeekday ().isEmpty ())
        ret.add (FixedWeekdayInMonthParser.getInstance ());
      if (!aConfig.getFixedWeekdayRelativeToFixed ().isEmpty ())
        ret.add (FixedWeekdayRelativeToFixedParser.getInstance ());
      if (!aConfig.getHinduHoliday ().isEmpty ())
        ret.add (HinduHolidayParser.getInstance ());
      if (!aConfig.getIslamicHoliday ().isEmpty ())
        ret.add (IslamicHolidayParser.getInstance ());
      if (!aConfig.getRelativeToFixed ().isEmpty ())
        ret.add (RelativeToFixedParser.getInstance ());
      if (!aConfig.getRelativeToWeekdayInMonth ().isEmpty ())
        ret.add (RelativeToWeekdayInMonthParser.getInstance ());
      return ret;
    }