// Persist library : Persistence layer
// Copyright (C) 2003 Vincent Daron
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
using System;
using System.Collections.Specialized;
namespace Persist.Converters{
/// <summary>
/// This converter is used to Conver DateTime.MinValue to System.DBNull.Value
/// </summary>
public class EmptyDateTimeConverter : IConverter
{
/// <summary>
/// Initialize Converter
/// Do nothing ...
/// </summary>
/// <param name="properties"></param>
public void Init(NameValueCollection properties)
{
}
/// <summary>
/// Return DateTime.MinValue if parameter equal System.DBNull.Value
/// </summary>
/// <param name="obj">the object to convert</param>
/// <returns>a valid DateTime</returns>
public object ConvertTo(object obj)
{
if(obj == System.DBNull.Value)
{
return DateTime.MinValue;
}
return obj;
}
/// <summary>
/// Return System.DBNull.Value if parameter equal DateTime.MinValue
/// </summary>
/// <param name="obj">the object to convert</param>
/// <returns>a valid DateTime or System.DBNull.Value</returns>
public object ConvertFrom(object obj)
{
if(obj is DateTime)
{
if((DateTime)obj == DateTime.MinValue)
{
return System.DBNull.Value;
}
}
return obj;
}
}
}
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