/// <summary>
/// Initializes a new instance of the <see cref="MonthlyRecurrence"/> class
/// executed every <paramref name="weekDayOfMonth"/> of the specified <paramref name="months"/>
/// at the specified <paramref name="timesOfDay"/>.
/// </summary>
/// <param name="behavior">The behavior regarding invalid times and ambiguous times.</param>
/// <param name="weekDayOfMonth">The recurrent week day of month.</param>
/// <param name="months">The recurrent months.</param>
/// <param name="timesOfDay">The times of day the recurrence is executed.</param>
/// <exception cref="ArgumentException"><paramref name="behavior"/> is not specified
/// -or- <paramref name="weekDayOfMonth"/> is not specified
/// -or- <paramref name="months"/> is not specified
/// -or- <paramref name="timesOfDay"/> is null or empty.</exception>
/// <exception cref="ArgumentOutOfRangeException">One of the specified <paramref name="timesOfDay"/> is lower than 00:00:00 or greater than or equal to 1.00:00:00.</exception>
public MonthlyRecurrence(RecurrenceBehavior behavior, RecurrentWeekDaysOfMonth weekDayOfMonth, RecurrentMonths months, IEnumerable <TimeSpan> timesOfDay)
: base(behavior, timesOfDay)
{
if (weekDayOfMonth == default(RecurrentWeekDaysOfMonth))
{
throw new ArgumentException("Non specified argument.", "weekDayOfMonth");
}
if (months == default(RecurrentMonths))
{
throw new ArgumentException("Non specified argument.", "months");
}
WeekDaysOfMonth = weekDayOfMonth;
Months = months;
}
/// <summary>
/// Initializes a new instance of the <see cref="MonthlyRecurrence"/> class
/// executed every <paramref name="weekDayOfMonth"/> of the specified <paramref name="months"/>
/// at the specified <paramref name="timesOfDay"/>.
/// </summary>
/// <param name="behavior">The behavior regarding invalid times and ambiguous times.</param>
/// <param name="weekDayOfMonth">The recurrent week day of month.</param>
/// <param name="months">The recurrent months.</param>
/// <param name="timesOfDay">The times of day the recurrence is executed.</param>
/// <exception cref="ArgumentException"><paramref name="behavior"/> is not specified
/// -or- <paramref name="weekDayOfMonth"/> is not specified
/// -or- <paramref name="months"/> is not specified
/// -or- <paramref name="timesOfDay"/> is null or empty.</exception>
/// <exception cref="ArgumentOutOfRangeException">One of the specified <paramref name="timesOfDay"/> is lower than 00:00:00 or greater than or equal to 1.00:00:00.</exception>
public MonthlyRecurrence(RecurrenceBehavior behavior, RecurrentWeekDaysOfMonth weekDayOfMonth, RecurrentMonths months, params TimeSpan[] timesOfDay)
: this(behavior, weekDayOfMonth, months, timesOfDay != null ? timesOfDay.AsEnumerable() : null)
{
}
internal static DateTime GetNextDateByWeekDayOfMonth(DateTime value, RecurrentMonths months, RecurrentWeekDaysOfMonth weekDayOfMonth)
{
var firstOfMonth = value.AddDays(-value.Day + 1);
//move to next month if necessary when any week days is requested
if (weekDayOfMonth.AnyWeekDays)
{
var positionedDates = from positionedDate in DatesInPosition(firstOfMonth.Year, firstOfMonth.Month, weekDayOfMonth.Position)
let dayOfWeek = FlagsEnum.PowerOfTwo <RecurrentWeekDays>(positionedDate.DayOfWeek)
where (dayOfWeek & weekDayOfMonth.WeekDays) == dayOfWeek &&
positionedDate == value
select positionedDate;
if (positionedDates.Any())
{
firstOfMonth = firstOfMonth.AddMonths(1);
}
}
var nextDate = default(DateTime);
do
{
var positionedDates = from positionedDate in DatesInPosition(firstOfMonth.Year, firstOfMonth.Month, weekDayOfMonth.Position)
let dayOfWeek = FlagsEnum.PowerOfTwo <RecurrentWeekDays>(positionedDate.DayOfWeek)
let month = FlagsEnum.PowerOfTwo <RecurrentMonths>(positionedDate.Month - 1)
where (dayOfWeek & weekDayOfMonth.WeekDays) == dayOfWeek &&
(month & months) == month &&
positionedDate > value
select positionedDate;
//move to fourth position if necessary when all weekDays are requested in last position
if (!weekDayOfMonth.AnyWeekDays &&
weekDayOfMonth.Position == WeekOfMonthPosition.Last &&
positionedDates.Count() > 1)
{
//consider positionedDates discontinuity only for continuous weekDays
if (FlagsEnum.ContinuousFlagValues <RecurrentWeekDays>(weekDayOfMonth.WeekDays) &&
positionedDates.First().AddDays(positionedDates.Count() - 1) != positionedDates.Last())
{
positionedDates = from positionedDate in DatesInPosition(firstOfMonth.Year, firstOfMonth.Month, WeekOfMonthPosition.Fourth)
let dayOfWeek = FlagsEnum.PowerOfTwo <RecurrentWeekDays>(positionedDate.DayOfWeek)
let month = FlagsEnum.PowerOfTwo <RecurrentMonths>(positionedDate.Month - 1)
where (dayOfWeek & weekDayOfMonth.WeekDays) == dayOfWeek &&
(month & months) == month &&
positionedDate > value
select positionedDate;
}
}
nextDate = (weekDayOfMonth.AnyWeekDays && weekDayOfMonth.Position == WeekOfMonthPosition.Last)
? positionedDates.LastOrDefault()
: positionedDates.FirstOrDefault();
firstOfMonth = firstOfMonth.AddMonths(1);
}while (nextDate == default(DateTime));
return(nextDate);
}
