Method TimeZoneRuleIterator

src/common/TimeZoneUtil.cpp:1047–1089

//-------------------------------------

TimeZoneRuleIterator::TimeZoneRuleIterator(USHORT aId, const ISC_TIMESTAMP_TZ& aFrom, const ISC_TIMESTAMP_TZ& aTo)
	: id(aId),
	  icuLib(Jrd::UnicodeUtil::getConversionICU()),
	  toTicks(TimeStamp::timeStampToTicks(aTo.utc_timestamp)),
	  icuCalendar(getDesc(aId)->getCalendar(icuLib))
{
	UErrorCode icuErrorCode = U_ZERO_ERROR;

	if (!icuCalendar)
		status_exception::raise(Arg::Gds(isc_random) << "Error calling ICU's ucal_open.");

	icuDate = TimeZoneUtil::timeStampToIcuDate(aFrom.utc_timestamp);

	icuLib.ucalSetMillis(icuCalendar, icuDate, &icuErrorCode);

	if (U_FAILURE(icuErrorCode))
	{
		fb_assert(false);
		status_exception::raise(Arg::Gds(isc_random) << "Error calling ICU's ucal_setMillis.");
	}

	UBool hasInitial = icuLib.ucalGetTimeZoneTransitionDate(icuCalendar, UCAL_TZ_TRANSITION_PREVIOUS_INCLUSIVE,
		&icuDate, &icuErrorCode);

	if (U_FAILURE(icuErrorCode))
	{
		fb_assert(false);
		status_exception::raise(Arg::Gds(isc_random) << "Error calling ICU's ucal_getTimeZoneTransitionDate.");
	}

	if (!hasInitial)
		icuDate = MIN_ICU_TIMESTAMP;

	icuLib.ucalSetMillis(icuCalendar, icuDate, &icuErrorCode);

	if (U_FAILURE(icuErrorCode))
	{
		fb_assert(false);
		status_exception::raise(Arg::Gds(isc_random) << "Error calling ICU's ucal_setMillis.");
	}

	startTicks = TimeStamp::timeStampToTicks(TimeZoneUtil::icuDateToTimeStamp(icuDate));
}

bool TimeZoneRuleIterator::next()
{