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ExpectedTypeConverter.cs
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// NpgsqlTypes.ExpectedTypeConverter.cs
//
// Author:
// Francisco Jr. (fxjrlists@yahoo.com.br)
//
// Copyright (C) 2002 The Npgsql Development Team
// npgsql-general@gborg.postgresql.org
// http://gborg.postgresql.org/project/npgsql/projdisplay.php
//
// 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.
using System;
using System.Collections.Generic;
using System.Data;
using System.Globalization;
using System.Net;
using System.Net.NetworkInformation;
using System.Reflection;
using System.Resources;
using System.Text;
using System.IO;
using Npgsql;
namespace NpgsqlTypes
{
internal static class ExpectedTypeConverter
{
internal static object ChangeType(object value, Type expectedType)
{
if (value == null)
return null;
Type currentType = value.GetType();
if (value is DBNull || currentType == expectedType)
return value;
#if NET35
if (expectedType == typeof(DateTimeOffset))
{
if (currentType == typeof(NpgsqlDate))
{
return new DateTimeOffset((DateTime)(NpgsqlDate)value);
}
else if (currentType == typeof(NpgsqlTime))
{
return new DateTimeOffset((DateTime)(NpgsqlTime)value);
}
else if (currentType == typeof(NpgsqlTimeTZ))
{
NpgsqlTimeTZ timetz = (NpgsqlTimeTZ)value;
return new DateTimeOffset(timetz.Ticks, new TimeSpan(timetz.TimeZone.Hours, timetz.TimeZone.Minutes, timetz.TimeZone.Seconds));
}
else if (currentType == typeof(NpgsqlTimeStamp))
{
return new DateTimeOffset((DateTime)(NpgsqlTimeStamp)value);
}
else if (currentType == typeof(NpgsqlTimeStampTZ))
{
NpgsqlTimeStampTZ timestamptz = (NpgsqlTimeStampTZ)value;
return new DateTimeOffset(timestamptz.Ticks, new TimeSpan(timestamptz.TimeZone.Hours, timestamptz.TimeZone.Minutes, timestamptz.TimeZone.Seconds));
}
else if (currentType == typeof(NpgsqlInterval))
{
return new DateTimeOffset(((TimeSpan)(NpgsqlInterval)value).Ticks, TimeSpan.FromSeconds(0));
}
else if (currentType == typeof(DateTime))
{
return new DateTimeOffset((DateTime)value);
}
else if (currentType == typeof(TimeSpan))
{
return new DateTimeOffset(((TimeSpan)value).Ticks, TimeSpan.FromSeconds(0));
}
else
{
return DateTimeOffset.Parse(value.ToString(), CultureInfo.InvariantCulture);
}
}
else
#endif
if (expectedType == typeof(TimeSpan))
{
if (currentType == typeof(NpgsqlDate))
{
return new TimeSpan(((DateTime)(NpgsqlDate)value).Ticks);
}
else if (currentType == typeof(NpgsqlTime))
{
return new TimeSpan(((NpgsqlTime)value).Ticks);
}
else if (currentType == typeof(NpgsqlTimeTZ))
{
return new TimeSpan(((NpgsqlTimeTZ)value).UTCTime.Ticks);
}
else if (currentType == typeof(NpgsqlTimeStamp))
{
return new TimeSpan(((NpgsqlTimeStamp)value).Ticks);
}
else if (currentType == typeof(NpgsqlTimeStampTZ))
{
return new TimeSpan(((DateTime)(NpgsqlTimeStampTZ)value).ToUniversalTime().Ticks);
}
else if (currentType == typeof(NpgsqlInterval))
{
return (TimeSpan)(NpgsqlInterval)value;
}
else if (currentType == typeof(DateTime))
{
return new TimeSpan(((DateTime)value).ToUniversalTime().Ticks);
}
else if (currentType == typeof(DateTimeOffset))
{
return new TimeSpan(((DateTimeOffset)value).Ticks);
}
else
{
#if NET40
return TimeSpan.Parse(value.ToString(), CultureInfo.InvariantCulture);
#else
return TimeSpan.Parse(value.ToString());
#endif
}
}
else if (expectedType == typeof(string))
{
return value.ToString();
}
else if (expectedType == typeof(Guid))
{
if (currentType == typeof(byte[]))
{
return new Guid((byte[])value);
}
else
{
return new Guid(value.ToString());
}
}
else if (expectedType == typeof(DateTime))
{
if (currentType == typeof(NpgsqlDate))
{
return (DateTime)(NpgsqlDate)value;
}
else if (currentType == typeof(NpgsqlTime))
{
return (DateTime)(NpgsqlTime)value;
}
else if (currentType == typeof(NpgsqlTimeTZ))
{
return (DateTime)(NpgsqlTimeTZ)value;
}
else if (currentType == typeof(NpgsqlTimeStamp))
{
return (DateTime)(NpgsqlTimeStamp)value;
}
else if (currentType == typeof(NpgsqlTimeStampTZ))
{
return (DateTime)(NpgsqlTimeStampTZ)value;
}
else if (currentType == typeof(NpgsqlInterval))
{
return new DateTime(((TimeSpan)(NpgsqlInterval)value).Ticks);
}
#if NET35
else if (currentType == typeof(DateTimeOffset))
{
return ((DateTimeOffset)value).LocalDateTime;
}
#endif
else if (currentType == typeof(TimeSpan))
{
return new DateTime(((TimeSpan)value).Ticks);
}
else
{
return DateTime.Parse(value.ToString(), CultureInfo.InvariantCulture);
}
}
else if (expectedType == typeof(byte[]))
{
if (currentType == typeof(Guid))
{
return ((Guid)value).ToByteArray();
}
else if (value is Array)
{
Array valueArray = (Array)value;
int byteLength = Buffer.ByteLength(valueArray);
byte[] bytes = new byte[byteLength];
Buffer.BlockCopy(valueArray, 0, bytes, 0, byteLength);
return bytes;
}
else
{
// expect InvalidCastException from this call
return Convert.ChangeType(value, expectedType);
}
}
else // long, int, short, double, float, decimal, byte, sbyte, bool, and other unspecified types
{
// ChangeType supports the conversions we want for above expected types
return Convert.ChangeType(value, expectedType);
}
}
}
}