75 lines
2.5 KiB
C#
75 lines
2.5 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 an indirect null value. This type is not used by PDFsharp, but at least
|
||
/// one tool from Adobe creates PDF files with a null object.
|
||
/// </summary>
|
||
public sealed class PdfNullObject : PdfObject
|
||
{
|
||
// Reference: 3.2.8 Null Object / Page 63
|
||
|
||
/// <summary>
|
||
/// Initializes a new instance of the <see cref="PdfNullObject"/> class.
|
||
/// </summary>
|
||
public PdfNullObject()
|
||
{ }
|
||
|
||
/// <summary>
|
||
/// Initializes a new instance of the <see cref="PdfNullObject"/> class.
|
||
/// </summary>
|
||
/// <param name="document">The document.</param>
|
||
public PdfNullObject(PdfDocument document)
|
||
: base(document)
|
||
{ }
|
||
|
||
/// <summary>
|
||
/// Returns the string "null".
|
||
/// </summary>
|
||
public override string ToString()
|
||
{
|
||
return "null";
|
||
}
|
||
|
||
/// <summary>
|
||
/// Writes the keyword <20>null<6C>.
|
||
/// </summary>
|
||
internal override void WriteObject(PdfWriter writer)
|
||
{
|
||
writer.WriteBeginObject(this);
|
||
writer.WriteRaw(" null ");
|
||
writer.WriteEndObject();
|
||
}
|
||
}
|
||
}
|