cs-dotnet/src/gatsnull.cs


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/*
 * Copyright (C) 2007-2012 Xagasoft, All rights reserved.
 *
 * This file is part of the libgats library and is released under the
 * terms of the license contained in the file LICENSE.
 */

using System.IO;

namespace Com.Xagasoft.Gats
{
    /// <summary>
    /// Represents a NULL value.
    /// </summary>
    /// <remarks>
    /// There are a couple of reasons for using a real, instantiated object to
    /// represent NULL instead of just using null.  Primarily, however, it is
    /// important to know the difference between an intentionally encoded null
    /// and an absence of any object at all.
    ///
    /// The GatsNull doesn't contain any fields.
    /// </remarks>
    public class GatsNull : GatsObject
    {
        public GatsNull()
        {
        }

        public override string ToString()
        {
            return "(null)";
        }

        public override void Read( Stream s, char type )
        {
        }

        public override void Write( Stream s )
        {
            s.WriteByte( (int)'n' );
        }
    }
}