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TimestampHandler.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 System.Diagnostics;
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 TimestampHandlerFactory : NpgsqlTypeHandlerFactory<Instant>
{
// Check for the legacy floating point timestamps feature
protected override NpgsqlTypeHandler<Instant> Create(NpgsqlConnection conn)
{
var csb = new NpgsqlConnectionStringBuilder(conn.ConnectionString);
return new TimestampHandler(conn.HasIntegerDateTimes, csb.ConvertInfinityDateTime);
}
}
class TimestampHandler : NpgsqlSimpleTypeHandler<Instant>, INpgsqlSimpleTypeHandler<LocalDateTime>
{
/// <summary>
/// A deprecated compile-time option of PostgreSQL switches to a floating-point representation of some date/time
/// fields. Npgsql (currently) does not support this mode.
/// </summary>
readonly bool _integerFormat;
/// <summary>
/// Whether to convert positive and negative infinity values to Instant.{Max,Min}Value when
/// an Instant is requested
/// </summary>
readonly bool _convertInfinityDateTime;
internal TimestampHandler(bool integerFormat, bool convertInfinityDateTime)
{
_integerFormat = integerFormat;
_convertInfinityDateTime = convertInfinityDateTime;
}
public override Instant Read(NpgsqlReadBuffer buf, int len, FieldDescription fieldDescription = null)
{
if (_integerFormat)
{
var value = buf.ReadInt64();
if (_convertInfinityDateTime)
{
if (value == long.MaxValue)
return Instant.MaxValue;
if (value == long.MinValue)
return Instant.MinValue;
}
return DecodeZonedDateTimeUsingIntegerFormat(value).ToInstant();
}
else
{
var value = buf.ReadDouble();
if (_convertInfinityDateTime)
{
if (double.IsPositiveInfinity(value))
return Instant.MaxValue;
if (double.IsNegativeInfinity(value))
return Instant.MinValue;
}
return DecodeZonedDateTimeUsingFloatingPointFormat(value).ToInstant();
}
}
LocalDateTime INpgsqlSimpleTypeHandler<LocalDateTime>.Read(NpgsqlReadBuffer buf, int len, FieldDescription fieldDescription)
{
if (_integerFormat)
{
var value = buf.ReadInt64();
if (value == long.MaxValue || value == long.MinValue)
throw new NpgsqlSafeReadException(new NotSupportedException("Infinity values not supported when reading ZonedDateTime, read as Instant instead"));
return DecodeZonedDateTimeUsingIntegerFormat(value).LocalDateTime;
}
else
{
var value = buf.ReadDouble();
if (double.IsPositiveInfinity(value) || double.IsNegativeInfinity(value))
throw new NpgsqlSafeReadException(new NotSupportedException("Infinity values not supported when reading ZonedDateTime, read as Instant instead"));
return DecodeZonedDateTimeUsingFloatingPointFormat(value).LocalDateTime;
}
}
internal static ZonedDateTime DecodeZonedDateTimeUsingIntegerFormat(long value)
{
Debug.Assert(value != long.MaxValue && value != long.MinValue);
if (value >= 0)
{
var date = (int)(value / 86400000000L);
var time = value % 86400000000L;
date += 730119; // 730119 = days since era (0001-01-01) for 2000-01-01
time *= 1000; // From microseconds to nanoseconds
return new ZonedDateTime().Plus(Duration.FromDays(date) + Duration.FromNanoseconds(time));
}
else
{
value = -value;
var date = (int)(value / 86400000000L);
var time = value % 86400000000L;
if (time != 0)
{
++date;
time = 86400000000L - time;
}
date = 730119 - date; // 730119 = days since era (0001-01-01) for 2000-01-01
time *= 1000; // From microseconds to nanoseconds
return new ZonedDateTime().Plus(Duration.FromDays(date) + Duration.FromNanoseconds(time));
}
}
internal static ZonedDateTime DecodeZonedDateTimeUsingFloatingPointFormat(double value)
{
Debug.Assert(!double.IsPositiveInfinity(value) && !double.IsNegativeInfinity(value));
if (value >= 0d)
{
var date = (int)value / 86400;
date += 730119; // 730119 = days since era (0001-01-01) for 2000-01-01
var microsecondOfDay = (long)((value % 86400d) * 1000000d);
return new ZonedDateTime().Plus(Duration.FromDays(date) + Duration.FromNanoseconds(microsecondOfDay*1000));
}
else
{
value = -value;
var date = (int)value / 86400;
var microsecondOfDay = (long)((value % 86400d) * 1000000d);
if (microsecondOfDay != 0)
{
++date;
microsecondOfDay = 86400000000L - microsecondOfDay;
}
date = 730119 - date; // 730119 = days since era (0001-01-01) for 2000-01-01
return new ZonedDateTime().Plus(Duration.FromDays(date) + Duration.FromNanoseconds(microsecondOfDay * 1000));
}
}
public override int ValidateAndGetLength(Instant value, NpgsqlParameter parameter)
=> 8;
int INpgsqlSimpleTypeHandler<LocalDateTime>.ValidateAndGetLength(LocalDateTime value, NpgsqlParameter parameter)
=> 8;
public override void Write(Instant value, NpgsqlWriteBuffer buf, NpgsqlParameter parameter)
{
if (_integerFormat)
{
if (_convertInfinityDateTime)
{
if (value == Instant.MaxValue)
{
buf.WriteInt64(long.MaxValue);
return;
}
if (value == Instant.MinValue)
{
buf.WriteInt64(long.MinValue);
return;
}
}
WriteDateTimeUsingIntegerFormat(value.InUtc().LocalDateTime, buf);
}
else
{
if (_convertInfinityDateTime)
{
if (value == Instant.MaxValue)
{
buf.WriteDouble(double.PositiveInfinity);
return;
}
if (value == Instant.MinValue)
{
buf.WriteDouble(double.NegativeInfinity);
return;
}
}
WriteDateTimeUsingFloatingPointFormat(value.InUtc().LocalDateTime, buf);
}
}
void INpgsqlSimpleTypeHandler<LocalDateTime>.Write(LocalDateTime value, NpgsqlWriteBuffer buf, NpgsqlParameter parameter)
{
if (_integerFormat)
WriteDateTimeUsingIntegerFormat(value, buf);
else
WriteDateTimeUsingFloatingPointFormat(value, buf);
}
internal static void WriteDateTimeUsingIntegerFormat(LocalDateTime value, NpgsqlWriteBuffer buf)
{
var totalDaysSinceEra = Period.Between(default(LocalDateTime), value, PeriodUnits.Days).Days;
var microsecondOfDay = value.NanosecondOfDay / 1000;
if (totalDaysSinceEra >= 730119) // 1/1/2000
{
var uSecsDate = (totalDaysSinceEra - 730119) * 86400000000L;
buf.WriteInt64(uSecsDate + microsecondOfDay);
}
else
{
var uSecsDate = (730119 - totalDaysSinceEra) * 86400000000L;
buf.WriteInt64(-(uSecsDate - microsecondOfDay));
}
}
internal static void WriteDateTimeUsingFloatingPointFormat(LocalDateTime value, NpgsqlWriteBuffer buf)
{
var totalDaysSinceEra = Period.Between(default(LocalDateTime), value, PeriodUnits.Days).Days;
var secondOfDay = value.NanosecondOfDay / 1000000000d;
if (totalDaysSinceEra >= 730119)
{
var uSecsDate = (totalDaysSinceEra - 730119) * 86400d;
buf.WriteDouble(uSecsDate + secondOfDay);
}
else
{
var uSecsDate = (730119 - totalDaysSinceEra) * 86400d;
buf.WriteDouble(-(uSecsDate - secondOfDay));
}
}
}
}