code: public CurrencyDateCalculatorBuilder<E> ccy2Calendar(final HolidayCalendar<E> ccy2Calendar) {
          if (ccy2Calendar != null) {
              this.ccy2Calendar = ccy2Calendar;
          }
          return this;
      }
docs: The holiday calendar for ccy2, if null or not set, then a default calendar will be used with NO holidays.
  @param ccy2Calendar the Calendar for ccy2
  @return the builder