/// <summary>
/// Reads an <see cref="DateTimeZone" /> value from the stream.
/// </summary>
/// <remarks>
/// The value must have been written by <see cref="LegacyDateTimeZoneWriter.WriteTimeZone" />.
/// </remarks>
/// <returns>The <see cref="DateTimeZone" /> value from the stream.</returns>
public DateTimeZone ReadTimeZone(string id)
{
int flag = ReadByte();
switch (flag)
{
case LegacyDateTimeZoneWriter.FlagTimeZoneFixed:
return(FixedDateTimeZone.Read(this, id));
case LegacyDateTimeZoneWriter.FlagTimeZonePrecalculated:
return(PrecalculatedDateTimeZone.ReadLegacy(this, id));
case LegacyDateTimeZoneWriter.FlagTimeZoneNull:
return(null); // Only used when reading a tail zone
case LegacyDateTimeZoneWriter.FlagTimeZoneCached:
return(CachedDateTimeZone.ReadLegacy(this, id));
case LegacyDateTimeZoneWriter.FlagTimeZoneDst:
return(DaylightSavingsDateTimeZone.ReadLegacy(this, id));
default:
throw new InvalidNodaDataException("Unknown time zone flag type: " + flag);
}
}
public void Read_NoNameInStream()
{
var ioHelper = DtzIoHelper.CreateNoStringPool();
var offset = Offset.FromHours(5);
ioHelper.Writer.WriteOffset(offset);
var zone = (FixedDateTimeZone)FixedDateTimeZone.Read(ioHelper.Reader, "id");
Assert.AreEqual("id", zone.Id);
Assert.AreEqual(offset, zone.Offset);
Assert.AreEqual("id", zone.Name);
}
public void Roundtrip()
{
var ioHelper = DtzIoHelper.CreateNoStringPool();
var oldZone = new FixedDateTimeZone("id", Offset.FromHours(4), "name");
oldZone.Write(ioHelper.Writer);
var newZone = (FixedDateTimeZone)FixedDateTimeZone.Read(ioHelper.Reader, "id");
Assert.AreEqual(oldZone.Id, newZone.Id);
Assert.AreEqual(oldZone.Offset, newZone.Offset);
Assert.AreEqual(oldZone.Name, newZone.Name);
}
/// <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);
}
}
}
