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InternalCharHandler.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.Linq;
using System.Text;
using Npgsql.BackendMessages;
using NpgsqlTypes;
using System.Data;
namespace Npgsql.TypeHandlers
{
/// <summary>
/// Type handler for the Postgresql "char" type, used only internally
/// </summary>
/// <remarks>
/// http://www.postgresql.org/docs/current/static/datatype-character.html
/// </remarks>
[TypeMapping("char", NpgsqlDbType.InternalChar)]
internal class InternalCharHandler : SimpleTypeHandler<char>,
ISimpleTypeHandler<byte>, ISimpleTypeHandler<short>, ISimpleTypeHandler<int>, ISimpleTypeHandler<long>
{
#region Read
public override char Read(NpgsqlBuffer buf, int len, FieldDescription fieldDescription)
{
return (char)buf.ReadByte();
}
byte ISimpleTypeHandler<byte>.Read(NpgsqlBuffer buf, int len, FieldDescription fieldDescription)
{
return buf.ReadByte();
}
short ISimpleTypeHandler<short>.Read(NpgsqlBuffer buf, int len, FieldDescription fieldDescription)
{
return buf.ReadByte();
}
int ISimpleTypeHandler<int>.Read(NpgsqlBuffer buf, int len, FieldDescription fieldDescription)
{
return buf.ReadByte();
}
long ISimpleTypeHandler<long>.Read(NpgsqlBuffer buf, int len, FieldDescription fieldDescription)
{
return buf.ReadByte();
}
#endregion
#region Write
public override int ValidateAndGetLength(object value, NpgsqlParameter parameter)
{
if (!(value is byte))
{
// ReSharper disable once ReturnValueOfPureMethodIsNotUsed
Convert.ToByte(value);
}
return 1;
}
public override void Write(object value, NpgsqlBuffer buf, NpgsqlParameter parameter)
{
buf.WriteByte(value as byte? ?? Convert.ToByte(value));
}
#endregion
}
}