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PgBufferedConverter.cs
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51 lines (40 loc) · 1.85 KB
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using System;
using System.Diagnostics.CodeAnalysis;
using System.Threading;
using System.Threading.Tasks;
namespace Npgsql.Internal;
[Experimental(NpgsqlDiagnostics.ConvertersExperimental)]
public abstract class PgBufferedConverter<T>(bool customDbNullPredicate = false) : PgConverter<T>(customDbNullPredicate)
{
protected abstract T ReadCore(PgReader reader);
protected abstract void WriteCore(PgWriter writer, T value);
public override Size GetSize(SizeContext context, T value, ref object? writeState)
=> throw new NotSupportedException();
public sealed override T Read(PgReader reader)
{
// We check FieldAtStart to speed up simple value reads, as field level buffering was handled by reader.StartRead() already.
if (!reader.FieldAtStart && reader.ShouldBufferCurrent())
ThrowIORequired(reader.CurrentBufferRequirement);
return ReadCore(reader);
}
public sealed override ValueTask<T> ReadAsync(PgReader reader, CancellationToken cancellationToken = default)
=> new(Read(reader));
internal sealed override ValueTask<object> ReadAsObject(bool async, PgReader reader, CancellationToken cancellationToken)
=> new(Read(reader)!);
public sealed override void Write(PgWriter writer, T value)
{
if (!writer.BufferingWrite && writer.ShouldFlush(writer.CurrentBufferRequirement))
ThrowIORequired(writer.CurrentBufferRequirement);
WriteCore(writer, value);
}
public sealed override ValueTask WriteAsync(PgWriter writer, [DisallowNull] T value, CancellationToken cancellationToken = default)
{
Write(writer, value);
return new();
}
internal sealed override ValueTask WriteAsObject(bool async, PgWriter writer, object value, CancellationToken cancellationToken)
{
Write(writer, (T)value);
return new();
}
}