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BoolHandler.cs
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66 lines (61 loc) · 2.42 KB
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#region License
// The PostgreSQL License
//
// Copyright (C) 2016 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 Npgsql.BackendMessages;
using NpgsqlTypes;
using System.Data;
namespace Npgsql.TypeHandlers
{
/// <remarks>
/// http://www.postgresql.org/docs/current/static/datatype-boolean.html
/// </remarks>
[TypeMapping("bool", NpgsqlDbType.Boolean, DbType.Boolean, typeof(bool))]
internal class BoolHandler : SimpleTypeHandler<bool>
{
internal BoolHandler(IBackendType backendType) : base(backendType) {}
public override bool Read(ReadBuffer buf, int len, FieldDescription fieldDescription)
{
return buf.ReadByte() != 0;
}
public override int ValidateAndGetLength(object value, NpgsqlParameter parameter)
{
if (!(value is bool))
{
var converted = Convert.ToBoolean(value);
if (parameter == null)
{
throw CreateConversionButNoParamException(value.GetType());
}
parameter.ConvertedValue = converted;
}
return 1;
}
public override void Write(object value, WriteBuffer buf, NpgsqlParameter parameter)
{
if (parameter?.ConvertedValue != null) {
value = parameter.ConvertedValue;
}
buf.WriteByte(((bool)value) ? (byte)1 : (byte)0);
}
}
}