public override async ValueTask Read(TComposite composite, NpgsqlReadBuffer buffer, bool async, CancellationToken cancellationToken = default)
{
if (_set == null)
{
ThrowHelper.ThrowInvalidOperationException_NoPropertySetter(typeof(TComposite), MemberInfo);
}
await buffer.Ensure(sizeof(uint) + sizeof(int), async, cancellationToken);
var oid = buffer.ReadUInt32();
Debug.Assert(oid == PostgresType.OID);
var length = buffer.ReadInt32();
if (length == -1)
{
return;
}
var value = NullableHandler <TMember> .Exists
? await NullableHandler <TMember> .ReadAsync(_handler, buffer, length, async, cancellationToken : cancellationToken)
: await _handler.Read <TMember>(buffer, length, async, cancellationToken : cancellationToken);
_set(composite, value);
}
static NullableHandler()
{
UnderlyingType = Nullable.GetUnderlyingType(typeof(T));
if (UnderlyingType == null)
{
return;
}
Read = NullableHandler.CreateDelegate <ReadDelegate <T> >(UnderlyingType, NullableHandler.ReadMethod);
ReadAsync = NullableHandler.CreateDelegate <ReadAsyncDelegate <T> >(UnderlyingType, NullableHandler.ReadAsyncMethod);
ValidateAndGetLength = NullableHandler.CreateDelegate <ValidateAndGetLengthDelegate <T> >(UnderlyingType, NullableHandler.ValidateMethod);
WriteAsync = NullableHandler.CreateDelegate <WriteAsyncDelegate <T> >(UnderlyingType, NullableHandler.WriteAsyncMethod);
}
public override async Task Write(TComposite composite, NpgsqlWriteBuffer buffer, NpgsqlLengthCache?lengthCache, bool async, CancellationToken cancellationToken = default)
{
if (_get == null)
{
ThrowHelper.ThrowInvalidOperationException_NoPropertyGetter(typeof(TComposite), MemberInfo);
}
if (buffer.WriteSpaceLeft < sizeof(int))
{
await buffer.Flush(async, cancellationToken);
}
buffer.WriteUInt32(PostgresType.OID);
await(NullableHandler <TMember> .Exists
? NullableHandler <TMember> .WriteAsync(_handler, _get(ref composite), buffer, lengthCache, null, async, cancellationToken)
: _handler.WriteWithLengthInternal(_get(ref composite), buffer, lengthCache, null, async, cancellationToken));
}
public override int ValidateAndGetLength(TComposite composite, ref NpgsqlLengthCache?lengthCache)
{
if (_get == null)
{
ThrowHelper.ThrowInvalidOperationException_NoPropertyGetter(typeof(TComposite), MemberInfo);
}
var value = _get(composite);
if (value == null)
{
return(0);
}
return(NullableHandler <TMember> .Exists
? NullableHandler <TMember> .ValidateAndGetLength(_handler, value, ref lengthCache, null)
: _handler.ValidateAndGetLength(value, ref lengthCache, null));
}
