/// <summary>
/// Calculates the first time an <see cref="NthIncludedDayTrigger" /> with
/// <c>intervalType = IntervalTypeWeekly</c> will fire
/// after the specified date. See <see cref="GetNextFireTimeUtc" /> for more
/// information.
/// </summary>
/// <param name="afterDateUtc">The time after which to find the nearest fire time.
/// This argument is treated as exclusive 舒 that is,
/// if afterTime is a valid fire time for the trigger, it
/// will not be returned as the next fire time.
/// </param>
/// <returns> the first time the trigger will fire following the specified
/// date
/// </returns>
private NullableDateTime GetWeeklyFireTimeAfter(DateTime afterDateUtc)
{
int currN = 0;
int currWeek;
int weekCount = 0;
bool gotOne = false;
#if !NET_35
afterDateUtc = TimeZone.ToLocalTime(afterDateUtc);
#else
afterDateUtc = TimeZoneInfo.ConvertTimeFromUtc(afterDateUtc, TimeZone);
#endif
DateTime currCal = new DateTime(afterDateUtc.Year, afterDateUtc.Month, afterDateUtc.Day);
// move to the first day of the week
// TODO, we are still bound to fixed local time zone as with TimeZone property
while (currCal.DayOfWeek != DateTimeFormatInfo.CurrentInfo.FirstDayOfWeek)
{
currCal = currCal.AddDays(-1);
}
currCal = new DateTime(currCal.Year, currCal.Month, currCal.Day, fireAtHour, fireAtMinute, fireAtSecond, 0);
currWeek = GetWeekOfYear(currCal);
while ((!gotOne) && (weekCount < nextFireCutoffInterval))
{
while ((currN != n) && (weekCount < 12))
{
//if we move into a new week, reset the current "n" counter
if (GetWeekOfYear(currCal) != currWeek)
{
currN = 0;
weekCount++;
currWeek = GetWeekOfYear(currCal);
}
//treating a null calendar as an all-inclusive calendar,
// increment currN if the current date being tested is included
// on the calendar
if ((calendar == null) || calendar.IsTimeIncluded(currCal))
{
currN++;
}
if (currN != n)
{
currCal = currCal.AddDays(1);
}
//if we pass endTime, drop out and return null.
#if !NET_35
if (EndTimeUtc.HasValue && TimeZone.ToUniversalTime(currCal) > EndTimeUtc.Value)
#else
if (EndTimeUtc.HasValue && TimeZoneInfo.ConvertTimeToUtc(currCal, TimeZone) > EndTimeUtc.Value)
#endif
{
return(null);
}
}
// We found an "n" or we've checked the requisite number of weeks.
// If we've found an "n", is it the right one? -- that is, we could
// be looking at an nth day PRIOR to afterDateUtc
if (currN == n)
{
#if !NET_35
if (afterDateUtc < TimeZone.ToUniversalTime(currCal))
#else
if (afterDateUtc < TimeZoneInfo.ConvertTimeToUtc(currCal, TimeZone))
#endif
{
gotOne = true;
}
else
{
// resume checking on the first day of the next week
// move back to the beginning of the week and add 7 days
// TODO, need to correlate with time zone in .NET 3.5
while (currCal.DayOfWeek != DateTimeFormatInfo.CurrentInfo.FirstDayOfWeek)
{
currCal = currCal.AddDays(-1);
}
currCal = currCal.AddDays(7);
currN = 0;
}
}
}
if (weekCount < nextFireCutoffInterval)
{
#if !NET_35
return(TimeZone.ToUniversalTime(currCal));
#else
return(TimeZoneInfo.ConvertTimeToUtc(currCal, TimeZone));
#endif
}
else
{
return(null);
}
}
