private Object GetOffsetInfo(LocalDateTime dt)
{
if (SavingsInstantTransitions.Length == 0)
{
return(StandardOffsets[0]);
}
// check if using last rules
if (LastRules.Length > 0 && dt.IsAfter(SavingsLocalTransitions[SavingsLocalTransitions.Length - 1]))
{
ZoneOffsetTransition[] transArray = FindTransitionArray(dt.Year);
Object info = null;
foreach (ZoneOffsetTransition trans in transArray)
{
info = FindOffsetInfo(dt, trans);
if (info is ZoneOffsetTransition || info.Equals(trans.OffsetBefore))
{
return(info);
}
}
return(info);
}
// using historic rules
int index = Arrays.BinarySearch(SavingsLocalTransitions, dt);
if (index == -1)
{
// before first transition
return(WallOffsets[0]);
}
if (index < 0)
{
// switch negative insert position to start of matched range
index = -index - 2;
}
else if (index < SavingsLocalTransitions.Length - 1 && SavingsLocalTransitions[index].Equals(SavingsLocalTransitions[index + 1]))
{
// handle overlap immediately following gap
index++;
}
if ((index & 1) == 0)
{
// gap or overlap
LocalDateTime dtBefore = SavingsLocalTransitions[index];
LocalDateTime dtAfter = SavingsLocalTransitions[index + 1];
ZoneOffset offsetBefore = WallOffsets[index / 2];
ZoneOffset offsetAfter = WallOffsets[index / 2 + 1];
if (offsetAfter.TotalSeconds > offsetBefore.TotalSeconds)
{
// gap
return(new ZoneOffsetTransition(dtBefore, offsetBefore, offsetAfter));
}
else
{
// overlap
return(new ZoneOffsetTransition(dtAfter, offsetBefore, offsetAfter));
}
}
else
{
// normal (neither gap or overlap)
return(WallOffsets[index / 2 + 1]);
}
}