public TimeSpan Difference(DateTime date1, DateTime date2)
{
if (date1.Equals(date2))
{
return(TimeSpan.Zero);
}
if (_collectorFilter.WeekDays.Count == 0 && _collectorFilter.CollectingHours.Count == 0 && _collectorFilter.CollectingDayHours.Count == 0)
{
return(new DateDiff(date1, date2, Calendar.Culture.Calendar, Calendar.FirstDayOfWeek, Calendar.YearBaseMonth).Difference);
}
TimeRange differenceRange = new TimeRange(date1, date2);
CalendarPeriodCollector collector = new CalendarPeriodCollector(
_collectorFilter, new TimeRange(differenceRange.Start.Date, differenceRange.End.Date.AddDays(1)), SeekDirection.Forward, Calendar);
collector.CollectHours();
// calculate gaps
TimeGapCalculator <TimeRange> gapCalculator = new TimeGapCalculator <TimeRange>(Calendar);
ITimePeriodCollection gaps = gapCalculator.GetGaps(collector.Periods, differenceRange);
// calculate difference (sum gap durations)
TimeSpan difference = gaps.GetTotalDuration(DurationProvider);
return(date1 < date2 ? difference : difference.Negate());
}
public TimePeriodSubtractor(ITimePeriodMapper periodMapper)
{
this.PeriodMapper = periodMapper;
_timePeriodCombiner = new TimePeriodCombiner <T>(periodMapper);
_timeGapCalculator = new TimeGapCalculator <T>(periodMapper);
_timePeriodIntersector = new TimePeriodIntersector <T>(periodMapper);
}
private Week FindNextWeek(Week current)
{
if (ExcludePeriods.Count == 0)
{
return(current.GetNextWeek());
}
TimeRange limits = new TimeRange(current.End.AddTicks(1), DateTime.MaxValue);
TimeGapCalculator <TimeRange> gapCalculator = new TimeGapCalculator <TimeRange>(Calendar);
ITimePeriodCollection remainingPeriods = gapCalculator.GetGaps(ExcludePeriods, limits);
return(remainingPeriods.Count > 0 ? new Week(remainingPeriods[0].Start) : null);
}
private Week FindPreviousWeek(Week current)
{
if (ExcludePeriods.Count == 0)
{
return(current.GetPreviousWeek());
}
TimeRange limits = new TimeRange(DateTime.MinValue, current.Start.AddTicks(-1));
TimeGapCalculator <TimeRange> gapCalculator = new TimeGapCalculator <TimeRange>(Calendar);
ITimePeriodCollection remainingPeriods = gapCalculator.GetGaps(ExcludePeriods, limits);
return(remainingPeriods.Count > 0 ? new Week(remainingPeriods[remainingPeriods.Count - 1].End) : null);
}
protected DateTime?CalculateEnd(DateTime start, TimeSpan offset,
SeekDirection seekDirection, SeekBoundaryMode seekBoundaryMode, out TimeSpan?remaining)
{
if (offset < TimeSpan.Zero)
{
throw new InvalidOperationException("time span must be positive");
}
remaining = offset;
// search periods
TimePeriodCollection searchPeriods = new TimePeriodCollection(_includePeriods);
// no search periods specified: search anytime
if (searchPeriods.Count == 0)
{
searchPeriods.Add(TimeRange.Anytime);
}
// available periods
ITimePeriodCollection availablePeriods = new TimePeriodCollection();
// no exclude periods specified: use all search periods
if (_excludePeriods.Count == 0)
{
availablePeriods.AddAll(searchPeriods);
}
else // remove exclude periods
{
TimeGapCalculator <TimeRange> gapCalculator = new TimeGapCalculator <TimeRange>();
foreach (ITimePeriod searchPeriod in searchPeriods)
{
// no overlaps: use the entire search range
if (!_excludePeriods.HasOverlapPeriods(searchPeriod))
{
availablePeriods.Add(searchPeriod);
}
else // add gaps of search period using the exclude periods
{
availablePeriods.AddAll(gapCalculator.GetGaps(_excludePeriods, searchPeriod));
}
}
}
// no periods available
if (availablePeriods.Count == 0)
{
return(null);
}
// combine the available periods, ensure no overlapping
// used for FindNextPeriod/FindPreviousPeriod
if (availablePeriods.Count > 1)
{
TimePeriodCombiner <TimeRange> periodCombiner = new TimePeriodCombiner <TimeRange>();
availablePeriods = periodCombiner.CombinePeriods(availablePeriods);
}
// find the starting search period
ITimePeriod startPeriod = null;
DateTime seekMoment = start;
switch (seekDirection)
{
case SeekDirection.Forward:
startPeriod = FindNextPeriod(start, availablePeriods, out seekMoment);
break;
case SeekDirection.Backward:
startPeriod = FindPreviousPeriod(start, availablePeriods, out seekMoment);
break;
}
// no starting period available
if (startPeriod == null)
{
return(null);
}
// no offset: use the search staring position
// maybe moved to the next available search period
if (offset == TimeSpan.Zero)
{
return(seekMoment);
}
// setup destination search
switch (seekDirection)
{
case SeekDirection.Forward:
for (int i = availablePeriods.IndexOf(startPeriod); i < availablePeriods.Count; i++)
{
ITimePeriod gap = availablePeriods[i];
TimeSpan gapRemining = gap.End - seekMoment;
bool isTargetPeriod = false;
switch (seekBoundaryMode)
{
case SeekBoundaryMode.Fill:
isTargetPeriod = gapRemining >= remaining;
break;
case SeekBoundaryMode.Next:
isTargetPeriod = gapRemining > remaining;
break;
}
if (isTargetPeriod)
{
DateTime end = seekMoment + remaining.Value;
remaining = null;
return(end);
}
remaining = remaining - gapRemining;
if (i == availablePeriods.Count - 1)
{
return(null);
}
seekMoment = availablePeriods[i + 1].Start; // next period
}
break;
case SeekDirection.Backward:
for (int i = availablePeriods.IndexOf(startPeriod); i >= 0; i--)
{
ITimePeriod gap = availablePeriods[i];
TimeSpan gapRemining = seekMoment - gap.Start;
bool isTargetPeriod = false;
switch (seekBoundaryMode)
{
case SeekBoundaryMode.Fill:
isTargetPeriod = gapRemining >= remaining;
break;
case SeekBoundaryMode.Next:
isTargetPeriod = gapRemining > remaining;
break;
}
if (isTargetPeriod)
{
DateTime end = seekMoment - remaining.Value;
remaining = null;
return(end);
}
remaining = remaining - gapRemining;
if (i == 0)
{
return(null);
}
seekMoment = availablePeriods[i - 1].End; // previous period
}
break;
}
return(null);
}