/// <summary>
/// Creates the <see cref="DateTimeZone"/> for the given canonical ID, which will definitely
/// be one of the values of the TzdbAliases dictionary.
/// </summary>
/// <param name="id">ID for the returned zone, which may be an alias.</param>
/// <param name="canonicalId">Canonical ID for zone data</param>
public DateTimeZone CreateZone(string id, string canonicalId)
{
Preconditions.CheckNotNull(id, nameof(id));
Preconditions.CheckNotNull(canonicalId, nameof(canonicalId));
using (var stream = zoneFields[canonicalId].CreateStream())
{
var reader = new DateTimeZoneReader(stream, stringPool);
// Skip over the ID before the zone data itself
reader.ReadString();
var type = (DateTimeZoneWriter.DateTimeZoneType)reader.ReadByte();
return(type switch
{
DateTimeZoneWriter.DateTimeZoneType.Fixed => FixedDateTimeZone.Read(reader, id),
DateTimeZoneWriter.DateTimeZoneType.Precalculated =>
CachedDateTimeZone.ForZone(PrecalculatedDateTimeZone.Read(reader, id)),
_ => throw new InvalidNodaDataException("Unknown time zone type " + type)
});
/// <inheritdoc />
public DateTimeZone CreateZone(string id, string canonicalId)
{
using (var stream = zoneFields[canonicalId].CreateStream())
{
var reader = new DateTimeZoneReader(stream, stringPool);
// Skip over the ID before the zone data itself
reader.ReadString();
var type = (DateTimeZoneWriter.DateTimeZoneType)reader.ReadByte();
switch (type)
{
case DateTimeZoneWriter.DateTimeZoneType.Fixed:
return(FixedDateTimeZone.Read(reader, id));
case DateTimeZoneWriter.DateTimeZoneType.Precalculated:
return(CachedDateTimeZone.ForZone(PrecalculatedDateTimeZone.Read(reader, id)));
default:
throw new InvalidNodaDataException("Unknown time zone type " + type);
}
}
}