KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > pdfbox > pdfparser > PDFObjectStreamParser


1 /**
2  * Copyright (c) 2003-2004, www.pdfbox.org
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are met:
7  *
8  * 1. Redistributions of source code must retain the above copyright notice,
9  * this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright notice,
11  * this list of conditions and the following disclaimer in the documentation
12  * and/or other materials provided with the distribution.
13  * 3. Neither the name of pdfbox; nor the names of its
14  * contributors may be used to endorse or promote products derived from this
15  * software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20  * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
24  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  *
28  * http://www.pdfbox.org
29  *
30  */
31 package org.pdfbox.pdfparser;
32
33 import java.io.IOException JavaDoc;
34
35 import java.util.ArrayList JavaDoc;
36 import java.util.List JavaDoc;
37
38 import org.pdfbox.cos.COSBase;
39 import org.pdfbox.cos.COSDocument;
40 import org.pdfbox.cos.COSInteger;
41 import org.pdfbox.cos.COSObject;
42 import org.pdfbox.cos.COSStream;
43
44 /**
45  * This will parse a PDF 1.5 object stream and extract all of the objects from the stream.
46  *
47  * @author <a HREF="mailto:ben@benlitchfield.com">Ben Litchfield</a>
48  * @version $Revision: 1.6 $
49  */
50 public class PDFObjectStreamParser extends BaseParser
51 {
52     private List JavaDoc streamObjects = null;
53     private List JavaDoc objectNumbers = null;
54     private COSStream stream;
55
56     /**
57      * Constructor.
58      *
59      * @param strm The stream to parse.
60      * @param doc The document for the current parsing.
61      *
62      * @throws IOException If there is an error initializing the stream.
63      */
64     public PDFObjectStreamParser( COSStream strm, COSDocument doc ) throws IOException JavaDoc
65     {
66        super( strm.getUnfilteredStream() );
67        setDocument( doc );
68        stream = strm;
69     }
70
71     /**
72      * This will parse the tokens in the stream. This will close the
73      * stream when it is finished parsing.
74      *
75      * @throws IOException If there is an error while parsing the stream.
76      */
77     public void parse() throws IOException JavaDoc
78     {
79         try
80         {
81             //need to first parse the header.
82 int numberOfObjects = stream.getInt( "N" );
83             objectNumbers = new ArrayList JavaDoc( numberOfObjects );
84             streamObjects = new ArrayList JavaDoc( numberOfObjects );
85             for( int i=0; i<numberOfObjects; i++ )
86             {
87                 int objectNumber = readInt();
88                 int offset = readInt();
89                 objectNumbers.add( new Integer JavaDoc( objectNumber ) );
90             }
91             COSObject object = null;
92             COSBase cosObject = null;
93             int objectCounter = 0;
94             while( (cosObject = parseDirObject()) != null )
95             {
96                 object = new COSObject(cosObject);
97                 object.setGenerationNumber( COSInteger.ZERO );
98                 COSInteger objNum =
99                     new COSInteger( ((Integer JavaDoc)objectNumbers.get( objectCounter)).intValue() );
100                 object.setObjectNumber( objNum );
101                 streamObjects.add( object );
102                 objectCounter++;
103             }
104         }
105         finally
106         {
107             pdfSource.close();
108         }
109     }
110
111     /**
112      * This will get the objects that were parsed from the stream.
113      *
114      * @return All of the objects in the stream.
115      */
116     public List JavaDoc getObjects()
117     {
118         return streamObjects;
119     }
120 }
Popular Tags