001/* 002 * $Id: PdfIndirectReference.java 4784 2011-03-15 08:33:00Z blowagie $ 003 * 004 * This file is part of the iText (R) project. 005 * Copyright (c) 1998-2011 1T3XT BVBA 006 * Authors: Bruno Lowagie, Paulo Soares, et al. 007 * 008 * This program is free software; you can redistribute it and/or modify 009 * it under the terms of the GNU Affero General Public License version 3 010 * as published by the Free Software Foundation with the addition of the 011 * following permission added to Section 15 as permitted in Section 7(a): 012 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT, 013 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS. 014 * 015 * This program is distributed in the hope that it will be useful, but 016 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 017 * or FITNESS FOR A PARTICULAR PURPOSE. 018 * See the GNU Affero General Public License for more details. 019 * You should have received a copy of the GNU Affero General Public License 020 * along with this program; if not, see http://www.gnu.org/licenses or write to 021 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 022 * Boston, MA, 02110-1301 USA, or download the license from the following URL: 023 * http://itextpdf.com/terms-of-use/ 024 * 025 * The interactive user interfaces in modified source and object code versions 026 * of this program must display Appropriate Legal Notices, as required under 027 * Section 5 of the GNU Affero General Public License. 028 * 029 * In accordance with Section 7(b) of the GNU Affero General Public License, 030 * a covered work must retain the producer line in every PDF that is created 031 * or manipulated using iText. 032 * 033 * You can be released from the requirements of the license by purchasing 034 * a commercial license. Buying such a license is mandatory as soon as you 035 * develop commercial activities involving the iText software without 036 * disclosing the source code of your own applications. 037 * These activities include: offering paid services to customers as an ASP, 038 * serving PDFs on the fly in a web application, shipping iText with a closed 039 * source product. 040 * 041 * For more information, please contact iText Software Corp. at this 042 * address: sales@itextpdf.com 043 */ 044package com.itextpdf.text.pdf; 045 046/** 047 * <CODE>PdfIndirectReference</CODE> contains a reference to a <CODE>PdfIndirectObject</CODE>. 048 * <P> 049 * Any object used as an element of an array or as a value in a dictionary may be specified 050 * by either a direct object of an indirect reference. An <I>indirect reference</I> is a reference 051 * to an indirect object, and consists of the indirect object's object number, generation number 052 * and the <B>R</B> keyword.<BR> 053 * This object is described in the 'Portable Document Format Reference Manual version 1.3' 054 * section 4.11 (page 54). 055 * 056 * @see PdfObject 057 * @see PdfIndirectObject 058 */ 059 060public class PdfIndirectReference extends PdfObject { 061 062 // membervariables 063 064/** the object number */ 065 protected int number; 066 067/** the generation number */ 068 protected int generation = 0; 069 070 // constructors 071 072 protected PdfIndirectReference() { 073 super(0); 074 } 075 076/** 077 * Constructs a <CODE>PdfIndirectReference</CODE>. 078 * 079 * @param type the type of the <CODE>PdfObject</CODE> that is referenced to 080 * @param number the object number. 081 * @param generation the generation number. 082 */ 083 084 PdfIndirectReference(int type, int number, int generation) { 085 super(0, new StringBuffer().append(number).append(" ").append(generation).append(" R").toString()); 086 this.number = number; 087 this.generation = generation; 088 } 089 090/** 091 * Constructs a <CODE>PdfIndirectReference</CODE>. 092 * 093 * @param type the type of the <CODE>PdfObject</CODE> that is referenced to 094 * @param number the object number. 095 */ 096 097 PdfIndirectReference(int type, int number) { 098 this(type, number, 0); 099 } 100 101 // methods 102 103/** 104 * Returns the number of the object. 105 * 106 * @return a number. 107 */ 108 109 public int getNumber() { 110 return number; 111 } 112 113/** 114 * Returns the generation of the object. 115 * 116 * @return a number. 117 */ 118 119 public int getGeneration() { 120 return generation; 121 } 122 123 public String toString() { 124 return new StringBuffer().append(number).append(" ").append(generation).append(" R").toString(); 125 } 126}