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UuidHandler.cs
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executable file
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#region License
// The PostgreSQL License
//
// Copyright (C) 2015 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.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using Npgsql.BackendMessages;
using NpgsqlTypes;
using System.Data;
namespace Npgsql.TypeHandlers
{
/// <remarks>
/// http://www.postgresql.org/docs/current/static/datatype-uuid.html
/// </remarks>
[TypeMapping("uuid", NpgsqlDbType.Uuid, DbType.Guid, typeof(Guid))]
internal class UuidHandler : TypeHandler<Guid>,
ISimpleTypeReader<Guid>, ISimpleTypeWriter,
ISimpleTypeReader<string>
{
public Guid Read(NpgsqlBuffer buf, int len, FieldDescription fieldDescription)
{
buf.Ensure(16);
var a = buf.ReadInt32();
var b = buf.ReadInt16();
var c = buf.ReadInt16();
var d = new byte[8];
buf.ReadBytes(d, 0, 8);
return new Guid(a, b, c, d);
}
string ISimpleTypeReader<string>.Read(NpgsqlBuffer buf, int len, FieldDescription fieldDescription)
{
return Read(buf, len, fieldDescription).ToString();
}
#region Write
public int ValidateAndGetLength(object value, NpgsqlParameter parameter)
{
var asString = value as string;
if (value is string)
{
var converted = Guid.Parse(asString);
if (parameter == null)
{
throw CreateConversionButNoParamException(value.GetType());
}
parameter.ConvertedValue = converted;
}
else if (!(value is Guid))
{
throw CreateConversionException(value.GetType());
}
return 16;
}
public void Write(object value, NpgsqlBuffer buf, NpgsqlParameter parameter)
{
if (parameter != null && parameter.ConvertedValue != null) {
value = parameter.ConvertedValue;
}
var bytes = ((Guid)value).ToByteArray();
buf.WriteInt32(BitConverter.ToInt32(bytes, 0));
buf.WriteInt16(BitConverter.ToInt16(bytes, 4));
buf.WriteInt16(BitConverter.ToInt16(bytes, 6));
buf.WriteBytes(bytes, 8, 8);
}
#endregion
}
}