public DateTime GetNextRecurrence(DateTime baseTime)
{
DateTime recurrence = baseTime;
if (DaysOfMonth != null)
{
var findDay = (from d in DaysOfMonth where d > recurrence.Day select d).FirstOrDefault();
if (findDay == 0)
{
recurrence = recurrence.AddMonths(1);
findDay = (from d in DaysOfMonth where d > recurrence.Day select d).FirstOrDefault();
}
if (findDay == 0)
{
var err = string.Format("Cannot find day of month recurrence for recurrence: {0}", ToString());
_log.Error(err);
throw new ArgumentOutOfRangeException(err);
}
if (findDay > DateTime.DaysInMonth(baseTime.Year, baseTime.Month))
{
findDay = DateTime.DaysInMonth(baseTime.Year, baseTime.Month);
}
recurrence = new DateTime(recurrence.Year, recurrence.Month, findDay, recurrence.Hour, recurrence.Minute,
recurrence.Second);
}
else if (DaysOfWeek != null)
{
if (!DaysOfWeek.All(d => d >= (int)DayOfWeek.Sunday && d <= (int)DayOfWeek.Saturday))
{
var err = string.Format("Cannot find day of week recurrence for recurrence {0}", ToString());
_log.Error(err);
throw new ArgumentOutOfRangeException(err);
}
while (!DaysOfWeek.Contains((int)recurrence.DayOfWeek))
{
recurrence = recurrence.AddDays(1.0);
}
}
else
{
if (MonthsLater > 0)
{
recurrence = recurrence.AddMonths(MonthsLater);
}
if (DaysLater > 0)
{
recurrence = recurrence.AddDays(DaysLater);
}
if (HoursLater > 0)
{
recurrence = recurrence.AddHours(HoursLater);
}
if (MinutesLater > 0)
{
recurrence = recurrence.AddMinutes(MinutesLater);
}
}
if (AtFixedTime != DateTime.MinValue)
{
recurrence = new DateTime(recurrence.Year, recurrence.Month, recurrence.Day, AtFixedTime.Hour,
AtFixedTime.Minute, AtFixedTime.Second);
if (recurrence < DateTime.UtcNow)
{
recurrence = recurrence.AddDays(1.0);
}
}
_dblog.InfoFormat("Recurrence {0} from base time {1} next {2}", ToString(), baseTime, recurrence);
return(recurrence);
}