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


1 /*
2  * $Id: PdfContents.java 2742 2007-05-08 13:04:56Z 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 import java.io.ByteArrayOutputStream JavaDoc;
54 import java.io.OutputStream JavaDoc;
55 import java.util.zip.DeflaterOutputStream JavaDoc;
56
57 import com.lowagie.text.DocWriter;
58 import com.lowagie.text.Document;
59 import com.lowagie.text.Rectangle;
60
61 /**
62  * <CODE>PdfContents</CODE> is a <CODE>PdfStream</CODE> containing the contents (text + graphics) of a <CODE>PdfPage</CODE>.
63  */
64
65 class PdfContents extends PdfStream {
66     
67     static final byte SAVESTATE[] = DocWriter.getISOBytes("q\n");
68     static final byte RESTORESTATE[] = DocWriter.getISOBytes("Q\n");
69     static final byte ROTATE90[] = DocWriter.getISOBytes("0 1 -1 0 ");
70     static final byte ROTATE180[] = DocWriter.getISOBytes("-1 0 0 -1 ");
71     static final byte ROTATE270[] = DocWriter.getISOBytes("0 -1 1 0 ");
72     static final byte ROTATEFINAL[] = DocWriter.getISOBytes(" cm\n");
73     // constructor
74
75 /**
76  * Constructs a <CODE>PdfContents</CODE>-object, containing text and general graphics.
77  *
78  * @param under the direct content that is under all others
79  * @param content the graphics in a page
80  * @param text the text in a page
81  * @param secondContent the direct content that is over all others
82  * @throws BadPdfFormatException on error
83  */
84     
85     PdfContents(PdfContentByte under, PdfContentByte content, PdfContentByte text, PdfContentByte secondContent, Rectangle page) throws BadPdfFormatException {
86         super();
87         try {
88             OutputStream JavaDoc out = null;
89             streamBytes = new ByteArrayOutputStream JavaDoc();
90             if (Document.compress)
91             {
92                 compressed = true;
93                 out = new DeflaterOutputStream JavaDoc(streamBytes);
94             }
95             else
96                 out = streamBytes;
97             int rotation = page.getRotation();
98             switch (rotation) {
99                 case 90:
100                     out.write(ROTATE90);
101                     out.write(DocWriter.getISOBytes(ByteBuffer.formatDouble(page.getTop())));
102                     out.write(' ');
103                     out.write('0');
104                     out.write(ROTATEFINAL);
105                     break;
106                 case 180:
107                     out.write(ROTATE180);
108                     out.write(DocWriter.getISOBytes(ByteBuffer.formatDouble(page.getRight())));
109                     out.write(' ');
110                     out.write(DocWriter.getISOBytes(ByteBuffer.formatDouble(page.getTop())));
111                     out.write(ROTATEFINAL);
112                     break;
113                 case 270:
114                     out.write(ROTATE270);
115                     out.write('0');
116                     out.write(' ');
117                     out.write(DocWriter.getISOBytes(ByteBuffer.formatDouble(page.getRight())));
118                     out.write(ROTATEFINAL);
119                     break;
120             }
121             if (under.size() > 0) {
122                 out.write(SAVESTATE);
123                 under.getInternalBuffer().writeTo(out);
124                 out.write(RESTORESTATE);
125             }
126             if (content.size() > 0) {
127                 out.write(SAVESTATE);
128                 content.getInternalBuffer().writeTo(out);
129                 out.write(RESTORESTATE);
130             }
131             if (text != null) {
132                 out.write(SAVESTATE);
133                 text.getInternalBuffer().writeTo(out);
134                 out.write(RESTORESTATE);
135             }
136             if (secondContent.size() > 0) {
137                 secondContent.getInternalBuffer().writeTo(out);
138             }
139             out.close();
140         }
141         catch (Exception JavaDoc e) {
142             throw new BadPdfFormatException(e.getMessage());
143         }
144         put(PdfName.LENGTH, new PdfNumber(streamBytes.size()));
145         if (compressed)
146             put(PdfName.FILTER, PdfName.FLATEDECODE);
147     }
148 }
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