internal PrecalculatedDateTimeZone([NotNull] string id, [NotNull] ZoneInterval[] intervals, IZoneIntervalMapWithMinMax tailZone)
: base(id, false,
ComputeOffset(intervals, tailZone, Offset.Min),
ComputeOffset(intervals, tailZone, Offset.Max))
{
this.periods = intervals;
this.tailZone = tailZone;
this.tailZoneStart = intervals[intervals.Length - 1].RawEnd; // We want this to be AfterMaxValue for tail-less zones.
if (tailZone != null)
{
// Cache a "clamped" zone interval for use at the start of the tail zone.
firstTailZoneInterval = tailZone.GetZoneInterval(tailZoneStart).WithStart(tailZoneStart);
}
ValidatePeriods(intervals, tailZone);
}
internal PrecalculatedDateTimeZone([NotNull] string id, [NotNull] ZoneInterval[] intervals, IZoneIntervalMapWithMinMax tailZone)
: base(id, false,
ComputeOffset(intervals, tailZone, Offset.Min),
ComputeOffset(intervals, tailZone, Offset.Max))
{
this.tailZone = tailZone;
this.periods = intervals;
this.tailZone = tailZone;
this.tailZoneStart = intervals[intervals.Length - 1].RawEnd; // We want this to be AfterMaxValue for tail-less zones.
if (tailZone != null)
{
// Cache a "clamped" zone interval for use at the start of the tail zone.
firstTailZoneInterval = tailZone.GetZoneInterval(tailZoneStart).WithStart(tailZoneStart);
}
ValidatePeriods(intervals, tailZone);
}
// Reasonably simple way of computing the maximum/minimum offset
// from either periods or transitions, with or without a tail zone.
private static Offset ComputeOffset([NotNull] ZoneInterval[] intervals,
IZoneIntervalMapWithMinMax tailZone,
OffsetAggregator aggregator)
{
Preconditions.CheckNotNull(intervals, nameof(intervals));
Preconditions.CheckArgument(intervals.Length > 0, nameof(intervals), "No intervals specified");
Offset ret = intervals[0].WallOffset;
for (int i = 1; i < intervals.Length; i++)
{
ret = aggregator(ret, intervals[i].WallOffset);
}
if (tailZone != null)
{
// Effectively a shortcut for picking either tailZone.MinOffset or
// tailZone.MaxOffset
Offset bestFromZone = aggregator(tailZone.MinOffset, tailZone.MaxOffset);
ret = aggregator(ret, bestFromZone);
}
return(ret);
}
// Reasonably simple way of computing the maximum/minimum offset
// from either periods or transitions, with or without a tail zone.
private static Offset ComputeOffset([NotNull] ZoneInterval[] intervals,
IZoneIntervalMapWithMinMax tailZone,
OffsetAggregator aggregator)
{
Preconditions.CheckNotNull(intervals, nameof(intervals));
Preconditions.CheckArgument(intervals.Length > 0, nameof(intervals), "No intervals specified");
Offset ret = intervals[0].WallOffset;
for (int i = 1; i < intervals.Length; i++)
{
ret = aggregator(ret, intervals[i].WallOffset);
}
if (tailZone != null)
{
// Effectively a shortcut for picking either tailZone.MinOffset or
// tailZone.MaxOffset
Offset bestFromZone = aggregator(tailZone.MinOffset, tailZone.MaxOffset);
ret = aggregator(ret, bestFromZone);
}
return ret;
}
