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TimeHandler.cs
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#region License
// The PostgreSQL License
//
// Copyright (C) 2018 The Npgsql Development Team
//
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose, without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph and the following two paragraphs appear in all copies.
//
// IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY
// FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
// INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
// DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
// THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
// ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS NO OBLIGATIONS
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
#endregion
using System;
using NodaTime;
using Npgsql.BackendMessages;
using Npgsql.TypeHandling;
#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
namespace Npgsql.NodaTime
{
public class TimeHandlerFactory : NpgsqlTypeHandlerFactory<LocalTime>
{
// Check for the legacy floating point timestamps feature
protected override NpgsqlTypeHandler<LocalTime> Create(NpgsqlConnection conn)
=> new TimeHandler(conn.HasIntegerDateTimes);
}
class TimeHandler : NpgsqlSimpleTypeHandler<LocalTime>
{
/// <summary>
/// A deprecated compile-time option of PostgreSQL switches to a floating-point representation of some date/time
/// fields. Some PostgreSQL-like databases (e.g. CrateDB) use floating-point representation by default and do not
/// provide the option of switching to integer format.
/// </summary>
readonly bool _integerFormat;
public TimeHandler(bool integerFormat)
{
_integerFormat = integerFormat;
}
public override LocalTime Read(NpgsqlReadBuffer buf, int len, FieldDescription fieldDescription = null)
{
if (_integerFormat)
// PostgreSQL time resolution == 1 microsecond == 10 ticks
return LocalTime.FromTicksSinceMidnight(buf.ReadInt64() * 10);
else
return LocalTime.FromTicksSinceMidnight((long)(buf.ReadDouble() * NodaConstants.TicksPerSecond));
}
public override int ValidateAndGetLength(LocalTime value, NpgsqlParameter parameter)
=> 8;
public override void Write(LocalTime value, NpgsqlWriteBuffer buf, NpgsqlParameter parameter)
{
if (_integerFormat)
buf.WriteInt64(value.TickOfDay / 10);
else
buf.WriteDouble((double)value.TickOfDay / NodaConstants.TicksPerSecond);
}
}
}