dev-npgsql/npgsql: Npgsql is the .NET data provider for PostgreSQL.

src/Npgsql.NodaTime/Internal/IntervalHandler.cs
106 строк5 KB
Shay Rojansky
Use file-scoped namespaces (#4225)
18 дек 2021, 13:52
18 дек 2021, 13:5243756d1
using System;
using NodaTime;
using Npgsql.BackendMessages;
using Npgsql.Internal;
using Npgsql.Internal.TypeHandling;
using Npgsql.PostgresTypes;
using NpgsqlTypes;
using BclIntervalHandler = Npgsql.Internal.TypeHandlers.DateTimeHandlers.IntervalHandler;

namespace Npgsql.NodaTime.Internal;

sealed partial class IntervalHandler :
    NpgsqlSimpleTypeHandler<Period>,
    INpgsqlSimpleTypeHandler<Duration>,
    INpgsqlSimpleTypeHandler<TimeSpan>,
    INpgsqlSimpleTypeHandler<NpgsqlInterval>
{
    readonly BclIntervalHandler _bclHandler;

    internal IntervalHandler(PostgresType postgresType)
        : base(postgresType)
        => _bclHandler = new BclIntervalHandler(postgresType);

    public override Period Read(NpgsqlReadBuffer buf, int len, FieldDescription? fieldDescription = null)
    {
        var microsecondsInDay = buf.ReadInt64();
        var days = buf.ReadInt32();
        var totalMonths = buf.ReadInt32();

        // NodaTime will normalize most things (i.e. nanoseconds to milliseconds, seconds...)
        // but it will not normalize months to years.
        var months = totalMonths % 12;
        var years = totalMonths / 12;

        return new PeriodBuilder
        {
            Nanoseconds = microsecondsInDay * 1000,
            Days = days,
            Months = months,
            Years = years
        }.Build().Normalize();
    }

    public override int ValidateAndGetLength(Period value, NpgsqlParameter? parameter)
        => 16;

    public override void Write(Period value, NpgsqlWriteBuffer buf, NpgsqlParameter? parameter)
    {
        // Note that the end result must be long
        // see #3438
        var microsecondsInDay =
            (((value.Hours * NodaConstants.MinutesPerHour + value.Minutes) * NodaConstants.SecondsPerMinute + value.Seconds) * NodaConstants.MillisecondsPerSecond + value.Milliseconds) * 1000 +
            value.Nanoseconds / 1000; // Take the microseconds, discard the nanosecond remainder

        buf.WriteInt64(microsecondsInDay);
        buf.WriteInt32(value.Weeks * 7 + value.Days); // days
        buf.WriteInt32(value.Years * 12 + value.Months); // months
    }

    Duration INpgsqlSimpleTypeHandler<Duration>.Read(NpgsqlReadBuffer buf, int len, FieldDescription? fieldDescription)
    {
        var microsecondsInDay = buf.ReadInt64();
        var days = buf.ReadInt32();
        var totalMonths = buf.ReadInt32();

        if (totalMonths != 0)
            throw new NpgsqlException("Cannot read PostgreSQL interval with non-zero months to NodaTime Duration. Try reading as a NodaTime Period instead.");

        return Duration.FromDays(days) + Duration.FromNanoseconds(microsecondsInDay * 1000);
    }

    public int ValidateAndGetLength(Duration value, NpgsqlParameter? parameter) => 16;

    public void Write(Duration value, NpgsqlWriteBuffer buf, NpgsqlParameter? parameter)
    {
        const long microsecondsPerSecond = 1_000_000;

        // Note that the end result must be long
        // see #3438
        var microsecondsInDay =
            (((value.Hours * NodaConstants.MinutesPerHour + value.Minutes) * NodaConstants.SecondsPerMinute + value.Seconds) *
                microsecondsPerSecond + value.SubsecondNanoseconds / 1000); // Take the microseconds, discard the nanosecond remainder

        buf.WriteInt64(microsecondsInDay);
        buf.WriteInt32(value.Days); // days
        buf.WriteInt32(0); // months
    }

    TimeSpan INpgsqlSimpleTypeHandler<TimeSpan>.Read(NpgsqlReadBuffer buf, int len, FieldDescription? fieldDescription)
        => _bclHandler.Read<TimeSpan>(buf, len, fieldDescription);

    int INpgsqlSimpleTypeHandler<TimeSpan>.ValidateAndGetLength(TimeSpan value, NpgsqlParameter? parameter)
        => ((INpgsqlSimpleTypeHandler<TimeSpan>)_bclHandler).ValidateAndGetLength(value, parameter);

    void INpgsqlSimpleTypeHandler<TimeSpan>.Write(TimeSpan value, NpgsqlWriteBuffer buf, NpgsqlParameter? parameter)
        => ((INpgsqlSimpleTypeHandler<TimeSpan>)_bclHandler).Write(value, buf, parameter);

    NpgsqlInterval INpgsqlSimpleTypeHandler<NpgsqlInterval>.Read(NpgsqlReadBuffer buf, int len, FieldDescription? fieldDescription)
        => _bclHandler.Read<NpgsqlInterval>(buf, len, fieldDescription);

    int INpgsqlSimpleTypeHandler<NpgsqlInterval>.ValidateAndGetLength(NpgsqlInterval value, NpgsqlParameter? parameter)
        => ((INpgsqlSimpleTypeHandler<NpgsqlInterval>)_bclHandler).ValidateAndGetLength(value, parameter);

    void INpgsqlSimpleTypeHandler<NpgsqlInterval>.Write(NpgsqlInterval value, NpgsqlWriteBuffer buf, NpgsqlParameter? parameter)
        => ((INpgsqlSimpleTypeHandler<NpgsqlInterval>)_bclHandler).Write(value, buf, parameter);
}