/// <summary>
/// Checks wheter dates occurr on an interval
/// </summary>
/// <param name="start">Date to count the intervals from</param>
/// <param name="interval">Interval</param>
/// <param name="precision"></param>
public TEInterval(DateTime start, int interval, IntervalPrecision precision)
{
this.Precision = precision;
this.Start = start;
this.Interval = interval;
}
/// <summary>
/// Get occurrences of TE between ranage of dates.
/// </summary>
/// <param name="rangeStart">Start of range</param>
/// <param name="rangeEnd">End of range</param>
/// <param name="precision">For performance use the longest value possible.</param>
/// <returns></returns>
public List<DateTime> Occurrences(DateTime rangeStart, DateTime rangeEnd, IntervalPrecision precision)
{
return this.Occurrences(rangeStart, rangeEnd, 0, precision);
}
/// <summary>
/// Returns a list of occurrences between 2 dates or a max number of occurrences from start date
/// based on the maxOccurrences param.
/// </summary>
/// <param name="rangeStart">Start of date range</param>
/// <param name="rangeEnd">End of date range. Must be specified if maxOccurrences is 0</param>
/// <param name="maxOccurrences">Max number of occurrences to return. Default 0 means infinte.
/// rangeEnd must be set if maxOccurrences is 0.
/// </param>
/// <param name="precision">For performance use the highest value possible. If using time temporal
/// expressions (hour,min,sec) increment should be set accordingly. Valid values are
/// Days, Hours, Mins, Secs, Weeks.
/// </param>
/// <returns></returns>
public List<DateTime> Occurrences(DateTime rangeStart, DateTime? rangeEnd, int maxOccurrences, IntervalPrecision precision)
{
if (!rangeEnd.HasValue && maxOccurrences < 1)
throw new ArgumentException("Must specify end of range or max occurrences to return.");
List<DateTime> occurrences = new List<DateTime>();
TimeSpan ts;
switch (precision)
{
case IntervalPrecision.Days:
ts = new TimeSpan(1, 0, 0, 0);
break;
case IntervalPrecision.Hours:
ts = new TimeSpan(1, 0, 0);
break;
case IntervalPrecision.Minutes:
ts = new TimeSpan(0, 1, 0);
break;
case IntervalPrecision.Seconds:
ts = new TimeSpan(0, 0, 1);
break;
case IntervalPrecision.Weeks:
ts = new TimeSpan(7, 0, 0, 0);
break;
default:
throw new NotImplementedException();
}
DateTime counter = new DateTime(rangeStart.Ticks);
if (!rangeEnd.HasValue)
rangeEnd = DateTime.MaxValue;
while (counter <= rangeEnd)
{
if (this.Includes(counter))
occurrences.Add(counter);
counter = counter.Add(ts);
if (maxOccurrences > 0 && occurrences.Count == maxOccurrences)
break;
}
return occurrences;
}
/// <summary>
/// Get specified number of occurrences of TE after specified date.
/// </summary>
/// <param name="start">Start date</param>
/// <param name="maxOccurrences">Number of occurrences to return</param>
/// <param name="precision">For performance use the longest value possible.</param>
/// <returns></returns>
public List<DateTime> Occurrences(DateTime start, int maxOccurrences, IntervalPrecision precision)
{
return Occurrences(start, null, maxOccurrences, precision);
}
