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#region PDFsharp - A .NET library for processing PDF
//
// Authors:
// Stefan Lange (mailto:Stefan.Lange@pdfsharp.com)
//
// Copyright (c) 2005-2008 empira Software GmbH, Cologne (Germany)
//
// http://www.pdfsharp.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
#endregion
using System;
using System.Collections;
using System.Text;
using System.IO;
using PdfSharp.Internal;
namespace PdfSharp.Pdf
{
/// <summary>
/// Represents a indirect reference that is not in the cross reference table.
/// </summary>
public sealed class PdfNull : PdfItem
{
PdfNull()
{ }
/// <summary>
/// Returns a <see cref="T:System.String"></see> that represents the current <see cref="T:System.Object"></see>.
/// </summary>
/// <returns>
/// A <see cref="T:System.String"></see> that represents the current <see cref="T:System.Object"></see>.
/// </returns>
public override string ToString()
{
return "null";
}
internal override void WriteObject(PdfSharp.Pdf.IO.PdfWriter writer)
{
// Implementet because it must be overridden.
writer.WriteRaw(" null ");
}
/// <summary>
/// The only instance of this class.
/// </summary>
public static readonly PdfNull Value = new PdfNull();
}
}
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