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Java > Open Source Codes > com > lowagie > text > pdf > PdfNull


1 /*
2  * $Id: PdfNull.java 2739 2007-05-04 11:24:51Z blowagie $
3  * $Name$
4  *
5  * Copyright 1999, 2000, 2001, 2002 Bruno Lowagie
6  *
7  * The contents of this file are subject to the Mozilla Public License Version 1.1
8  * (the "License"); you may not use this file except in compliance with the License.
9  * 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 JavaDoc 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 JavaDoc toString() {
85         return "null";
86     }
87 }
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