internal override DataRowMessage Load(ReadBuffer buf)
{
buf.Ensure(sizeof(short));
NumColumns = buf.ReadInt16();
Buffer = buf;
Column = -1;
ColumnLen = -1;
PosInColumn = 0;
return this;
}
internal override T2 ReadFully <T2>(ReadBuffer buf, int len, FieldDescription fieldDescription = null)
{
buf.Ensure(len);
var asTypedHandler = this as ISimpleTypeHandler <T2>;
if (asTypedHandler == null)
{
throw new InvalidCastException(fieldDescription == null
? "Can't cast database type to " + typeof(T2).Name
: $"Can't cast database type {fieldDescription.Handler.PgDisplayName} to {typeof(T2).Name}"
);
}
return(asTypedHandler.Read(buf, len, fieldDescription));
}
/// <remarks>
/// A type handler may implement ISimpleTypeHandler for types other than its primary one.
/// This is why this method has type parameter T2 and not T.
/// </remarks>
internal override async ValueTask <T2> Read <T2>(ReadBuffer buf, int len, bool async, FieldDescription fieldDescription = null)
{
await buf.Ensure(len, async);
var asTypedHandler = this as ISimpleTypeHandler <T2>;
if (asTypedHandler == null)
{
buf.Skip(len); // Perform this in sync for performance
throw new SafeReadException(new InvalidCastException(fieldDescription == null
? "Can't cast database type to " + typeof(T2).Name
: $"Can't cast database type {fieldDescription.Handler.PgDisplayName} to {typeof(T2).Name}"
));
}
return(asTypedHandler.Read(buf, len, fieldDescription));
}
internal ReadBuffer EnsureOrAllocateTemp(int count)
{
if (count <= Size)
{
Ensure(count);
return(this);
}
// Worst case: our buffer isn't big enough. For now, allocate a new buffer
// and copy into it
// TODO: Optimize with a pool later?
var tempBuf = new ReadBuffer(Connector, Underlying, count, TextEncoding);
CopyTo(tempBuf);
Clear();
tempBuf.Ensure(count);
return(tempBuf);
}
internal ReadBuffer EnsureOrAllocateTemp(int count)
{
if (count <= Size) {
Ensure(count);
return this;
}
// Worst case: our buffer isn't big enough. For now, allocate a new buffer
// and copy into it
// TODO: Optimize with a pool later?
var tempBuf = new ReadBuffer(Connector, Underlying, count, TextEncoding);
CopyTo(tempBuf);
Clear();
tempBuf.Ensure(count);
return tempBuf;
}
