private long FindOccurrence(long ticks, bool startInclusive)
{
if (!startInclusive)
{
ticks++;
}
CalendarHelper.FillDateTimeParts(
ticks,
out int startSecond,
out int startMinute,
out int startHour,
out int startDay,
out int startMonth,
out int startYear);
var minMatchedDay = GetFirstSet(_dayOfMonth);
var second = startSecond;
var minute = startMinute;
var hour = startHour;
var day = startDay;
var month = startMonth;
var year = startYear;
if (!GetBit(_second, second) && !Move(_second, ref second))
{
minute++;
}
if (!GetBit(_minute, minute) && !Move(_minute, ref minute))
{
hour++;
}
if (!GetBit(_hour, hour) && !Move(_hour, ref hour))
{
day++;
}
// If NearestWeekday flag is set it's possible forward shift.
if (HasFlag(CronExpressionFlag.NearestWeekday))
{
day = CronField.DaysOfMonth.First;
}
if (!GetBit(_dayOfMonth, day) && !Move(_dayOfMonth, ref day))
{
goto RetryMonth;
}
if (!GetBit(_month, month))
{
goto RetryMonth;
}
Retry:
if (day > GetLastDayOfMonth(year, month))
{
goto RetryMonth;
}
if (HasFlag(CronExpressionFlag.DayOfMonthLast))
{
day = GetLastDayOfMonth(year, month);
}
var lastCheckedDay = day;
if (HasFlag(CronExpressionFlag.NearestWeekday))
{
day = CalendarHelper.MoveToNearestWeekDay(year, month, day);
}
if (IsDayOfWeekMatch(year, month, day))
{
if (CalendarHelper.IsGreaterThan(year, month, day, startYear, startMonth, startDay))
{
goto RolloverDay;
}
if (hour > startHour)
{
goto RolloverHour;
}
if (minute > startMinute)
{
goto RolloverMinute;
}
goto ReturnResult;
RolloverDay : hour = GetFirstSet(_hour);
RolloverHour : minute = GetFirstSet(_minute);
RolloverMinute : second = GetFirstSet(_second);
ReturnResult:
var found = CalendarHelper.DateTimeToTicks(year, month, day, hour, minute, second);
if (found >= ticks)
{
return(found);
}
}
day = lastCheckedDay;
if (Move(_dayOfMonth, ref day))
{
goto Retry;
}
RetryMonth:
if (!Move(_month, ref month) && ++year >= MaxYear)
{
return(NotFound);
}
day = minMatchedDay;
goto Retry;
}
