01: /*
02: * $Id: PdfNull.java 2739 2007-05-04 11:24:51Z blowagie $
03: * $Name$
04: *
05: * Copyright 1999, 2000, 2001, 2002 Bruno Lowagie
06: *
07: * The contents of this file are subject to the Mozilla Public License Version 1.1
08: * (the "License"); you may not use this file except in compliance with the License.
09: * You may obtain a copy of the License at http://www.mozilla.org/MPL/
10: *
11: * Software distributed under the License is distributed on an "AS IS" basis,
12: * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13: * for the specific language governing rights and limitations under the License.
14: *
15: * The Original Code is 'iText, a free JAVA-PDF library'.
16: *
17: * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
18: * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
19: * All Rights Reserved.
20: * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
21: * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
22: *
23: * Contributor(s): all the names of the contributors are added in the source code
24: * where applicable.
25: *
26: * Alternatively, the contents of this file may be used under the terms of the
27: * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
28: * provisions of LGPL are applicable instead of those above. If you wish to
29: * allow use of your version of this file only under the terms of the LGPL
30: * License and not to allow others to use your version of this file under
31: * the MPL, indicate your decision by deleting the provisions above and
32: * replace them with the notice and other provisions required by the LGPL.
33: * If you do not delete the provisions above, a recipient may use your version
34: * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
35: *
36: * This library is free software; you can redistribute it and/or modify it
37: * under the terms of the MPL as stated above or under the terms of the GNU
38: * Library General Public License as published by the Free Software Foundation;
39: * either version 2 of the License, or any later version.
40: *
41: * This library is distributed in the hope that it will be useful, but WITHOUT
42: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
43: * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
44: * details.
45: *
46: * If you didn't download this code from the following link, you should check if
47: * you aren't using an obsolete version:
48: * http://www.lowagie.com/iText/
49: */
50:
51: package com.lowagie.text.pdf;
52:
53: /**
54: * <CODE>PdfNull</CODE> is the Null object represented by the keyword <VAR>null</VAR>.
55: * <P>
56: * This object is described in the 'Portable Document Format Reference Manual version 1.7'
57: * section 3.2.8 (page 63).
58: *
59: * @see PdfObject
60: */
61:
62: public class PdfNull extends PdfObject {
63:
64: // static membervariables
65:
66: /** This is an instance of the <CODE>PdfNull</CODE>-object. */
67: public static final PdfNull PDFNULL = new PdfNull();
68:
69: /** This is the content of a <CODE>PdfNull</CODE>-object. */
70: private static final String CONTENT = "null";
71:
72: // constructors
73:
74: /**
75: * Constructs a <CODE>PdfNull</CODE>-object.
76: * <P>
77: * You never need to do this yourself, you can always use the static final object <VAR>PDFNULL</VAR>.
78: */
79:
80: public PdfNull() {
81: super (NULL, CONTENT);
82: }
83:
84: public String toString() {
85: return "null";
86: }
87: }
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