/*
* $Id: PdfNull.java 4784 2011-03-15 08:33:00Z blowagie $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2011 1T3XT BVBA
* Authors: Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT,
* 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
*
* This program 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 Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: [email protected]
*/
package com.itextpdf.text.pdf;
/**
* <CODE>PdfNull</CODE> is the Null object represented by the keyword <VAR>null</VAR>.
* <P>
* This object is described in the 'Portable Document Format Reference Manual version 1.7'
* section 3.2.8 (page 63).
*
* @see PdfObject
*/
public class PdfNull extends PdfObject {
// CLASS CONSTANTS
/** An instance of the <CODE>PdfNull</CODE>-object. */
public static final PdfNull PDFNULL = new PdfNull();
/** The content of the <CODE>PdfNull</CODE>-object. */
private static final String CONTENT = "null";
// CONSTRUCTOR
/**
* Constructs a <CODE>PdfNull</CODE>-object.
* <P>
* You never need to do this yourself, you can always use the static final object <VAR>PDFNULL</VAR>.
*/
public PdfNull() {
super(NULL, CONTENT);
}
// CLASS METHOD
public String toString() {
return "null";
}
}
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