// Reasonably simple way of computing the maximum/minimum offset
// from either periods or transitions, with or without a tail zone.
private static Offset ComputeOffset <T>(IEnumerable <T> elements,
OffsetExtractor <T> extractor,
DateTimeZone tailZone,
OffsetAggregator aggregator)
{
Preconditions.CheckNotNull(elements, "elements");
Offset ret;
using (var iterator = elements.GetEnumerator())
{
var hasFirst = iterator.MoveNext();
Preconditions.CheckArgument(hasFirst, "iterator", "No transitions / periods specified");
ret = extractor(iterator.Current);
while (iterator.MoveNext())
{
ret = aggregator(ret, extractor(iterator.Current));
}
}
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,
DateTimeZone 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;
}
