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


1 /*
2  * $Id: PdfReaderInstance.java 2761 2007-05-16 14:16:01Z psoares33 $
3  * $Name$
4  *
5  * Copyright 2001, 2002 Paulo Soares
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 import java.io.IOException JavaDoc;
53 import java.util.ArrayList JavaDoc;
54 import java.util.HashMap JavaDoc;
55 import java.util.Iterator JavaDoc;
56 /**
57  * Instance of PdfReader in each output document.
58  *
59  * @author Paulo Soares (psoares@consiste.pt)
60  */

61 class PdfReaderInstance {
62     static final PdfLiteral IDENTITYMATRIX = new PdfLiteral("[1 0 0 1 0 0]");
63     static final PdfNumber ONE = new PdfNumber(1);
64     int myXref[];
65     PdfReader reader;
66     RandomAccessFileOrArray file;
67     HashMap JavaDoc importedPages = new HashMap JavaDoc();
68     PdfWriter writer;
69     HashMap JavaDoc visited = new HashMap JavaDoc();
70     ArrayList JavaDoc nextRound = new ArrayList JavaDoc();
71     
72     PdfReaderInstance(PdfReader reader, PdfWriter writer) {
73         this.reader = reader;
74         this.writer = writer;
75         file = reader.getSafeFile();
76         myXref = new int[reader.getXrefSize()];
77     }
78     
79     PdfReader getReader() {
80         return reader;
81     }
82     
83     PdfImportedPage getImportedPage(int pageNumber) {
84         if (!reader.isOpenedWithFullPermissions())
85             throw new IllegalArgumentException JavaDoc("PdfReader not opened with owner password");
86         if (pageNumber < 1 || pageNumber > reader.getNumberOfPages())
87             throw new IllegalArgumentException JavaDoc("Invalid page number");
88         Integer JavaDoc i = new Integer JavaDoc(pageNumber);
89         PdfImportedPage pageT = (PdfImportedPage)importedPages.get(i);
90         if (pageT == null) {
91             pageT = new PdfImportedPage(this, writer, pageNumber);
92             importedPages.put(i, pageT);
93         }
94         return pageT;
95     }
96     
97     int getNewObjectNumber(int number, int generation) {
98         if (myXref[number] == 0) {
99             myXref[number] = writer.getIndirectReferenceNumber();
100             nextRound.add(new Integer JavaDoc(number));
101         }
102         return myXref[number];
103     }
104     
105     RandomAccessFileOrArray getReaderFile() {
106         return file;
107     }
108     
109     PdfObject getResources(int pageNumber) {
110         PdfObject obj = PdfReader.getPdfObjectRelease(reader.getPageNRelease(pageNumber).get(PdfName.RESOURCES));
111         return obj;
112     }
113     
114     
115     PdfStream getFormXObject(int pageNumber) throws IOException JavaDoc {
116         PdfDictionary page = reader.getPageNRelease(pageNumber);
117         PdfObject contents = PdfReader.getPdfObjectRelease(page.get(PdfName.CONTENTS));
118         PdfDictionary dic = new PdfDictionary();
119         byte bout[] = null;
120         if (contents != null) {
121             if (contents.isStream())
122                 dic.putAll((PRStream)contents);
123             else
124                 bout = reader.getPageContent(pageNumber, file);
125         }
126         else
127             bout = new byte[0];
128         dic.put(PdfName.RESOURCES, PdfReader.getPdfObjectRelease(page.get(PdfName.RESOURCES)));
129         dic.put(PdfName.TYPE, PdfName.XOBJECT);
130         dic.put(PdfName.SUBTYPE, PdfName.FORM);
131         PdfImportedPage impPage = (PdfImportedPage)importedPages.get(new Integer JavaDoc(pageNumber));
132         dic.put(PdfName.BBOX, new PdfRectangle(impPage.getBoundingBox()));
133         PdfArray matrix = impPage.getMatrix();
134         if (matrix == null)
135             dic.put(PdfName.MATRIX, IDENTITYMATRIX);
136         else
137             dic.put(PdfName.MATRIX, matrix);
138         dic.put(PdfName.FORMTYPE, ONE);
139         PRStream stream;
140         if (bout == null) {
141             stream = new PRStream((PRStream)contents, dic);
142         }
143         else {
144             stream = new PRStream(reader, bout);
145             stream.putAll(dic);
146         }
147         return stream;
148     }
149     
150     void writeAllVisited() throws IOException JavaDoc {
151         while (!nextRound.isEmpty()) {
152             ArrayList JavaDoc vec = nextRound;
153             nextRound = new ArrayList JavaDoc();
154             for (int k = 0; k < vec.size(); ++k) {
155                 Integer JavaDoc i = (Integer JavaDoc)vec.get(k);
156                 if (!visited.containsKey(i)) {
157                     visited.put(i, null);
158                     int n = i.intValue();
159                     writer.addToBody(reader.getPdfObjectRelease(n), myXref[n]);
160                 }
161             }
162         }
163     }
164     
165     void writeAllPages() throws IOException JavaDoc {
166         try {
167             file.reOpen();
168             for (Iterator JavaDoc it = importedPages.values().iterator(); it.hasNext();) {
169                 PdfImportedPage ip = (PdfImportedPage)it.next();
170                 writer.addToBody(ip.getFormXObject(), ip.getIndirectReference());
171             }
172             writeAllVisited();
173         }
174         finally {
175             try {
176                 reader.close();
177                 file.close();
178             }
179             catch (Exception JavaDoc e) {
180                 //Empty on purpose
181
}
182         }
183     }
184 }
185
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