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DateHandler.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 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 DateHandlerFactory : NpgsqlTypeHandlerFactory<LocalDate>
{
protected override NpgsqlTypeHandler<LocalDate> Create(NpgsqlConnection conn)
{
var csb = new NpgsqlConnectionStringBuilder(conn.ConnectionString);
return new DateHandler(csb.ConvertInfinityDateTime);
}
}
sealed class DateHandler : NpgsqlSimpleTypeHandler<LocalDate>
{
/// <summary>
/// Whether to convert positive and negative infinity values to Instant.{Max,Min}Value when
/// an Instant is requested
/// </summary>
readonly bool _convertInfinityDateTime;
internal DateHandler(bool convertInfinityDateTime)
{
_convertInfinityDateTime = convertInfinityDateTime;
}
public override LocalDate Read(NpgsqlReadBuffer buf, int len, FieldDescription fieldDescription = null)
{
var value = buf.ReadInt32();
if (_convertInfinityDateTime)
{
if (value == int.MaxValue)
return LocalDate.MaxIsoValue;
if (value == int.MinValue)
return LocalDate.MinIsoValue;
}
return new LocalDate().PlusDays(value + 730119);
}
public override int ValidateAndGetLength(LocalDate value, NpgsqlParameter parameter)
=> 4;
public override void Write(LocalDate value, NpgsqlWriteBuffer buf, NpgsqlParameter parameter)
{
if (_convertInfinityDateTime)
{
if (value == LocalDate.MaxIsoValue)
{
buf.WriteInt32(int.MaxValue);
return;
}
if (value == LocalDate.MinIsoValue)
{
buf.WriteInt32(int.MinValue);
return;
}
}
var totalDaysSinceEra = Period.Between(default(LocalDate), value, PeriodUnits.Days).Days;
buf.WriteInt32(totalDaysSinceEra - 730119);
}
}
}