/// <inheritdoc />
public DateTimeZone GetZoneOrNull([NotNull] string id)
{
Preconditions.CheckNotNull(id, nameof(id));
DateTimeZone fixedZone = FixedDateTimeZone.GetFixedZoneOrNull(id);
if (fixedZone != null)
{
return(fixedZone);
}
lock (accessLock)
{
DateTimeZone zone;
if (!timeZoneMap.TryGetValue(id, out zone))
{
return(null);
}
if (zone == null)
{
zone = source.ForId(id);
if (zone == null)
{
throw new InvalidDateTimeZoneSourceException("Time zone " + id + " is supported by source " + VersionId + " but not returned");
}
timeZoneMap[id] = zone;
}
return(zone);
}
}
/// <inheritdoc />
public DateTimeZone?GetZoneOrNull(string id)
{
Preconditions.CheckNotNull(id, nameof(id));
return(GetZoneFromSourceOrNull(id) ?? FixedDateTimeZone.GetFixedZoneOrNull(id));
}
