67 lines
2.3 KiB
C#
67 lines
2.3 KiB
C#
|
#region PDFsharp - A .NET library for processing PDF
|
||
|
|
//
|
||
|
|
// Authors:
|
||
|
|
// Stefan Lange
|
||
|
|
//
|
||
|
|
// Copyright (c) 2005-2017 empira Software GmbH, Cologne Area (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 PdfSharp.Pdf.IO;
|
||
|
|
|
||
|
|
namespace PdfSharp.Pdf
|
||
|
|
{
|
||
|
|
/// <summary>
|
||
|
|
/// Represents a indirect reference that is not in the cross reference table.
|
||
|
|
/// </summary>
|
||
|
|
public sealed class PdfNull : PdfItem
|
||
|
|
{
|
||
|
|
// Reference: 3.2.8 Null Object / Page 63
|
||
|
|
|
||
|
|
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(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();
|
||
|
|
}
|
||
|
|
}
|