001/*
002 * $Id: PdfReaderContentParser.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, Kevin Day, 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.parser;
045
046import java.io.IOException;
047
048import com.itextpdf.text.pdf.PdfDictionary;
049import com.itextpdf.text.pdf.PdfName;
050import com.itextpdf.text.pdf.PdfReader;
051
052/**
053 * A utility class that makes it cleaner to process content from pages of a PdfReader
054 * through a specified RenderListener.
055 * @since 5.0.2
056 */
057public class PdfReaderContentParser {
058    /** the reader this parser will process */
059    private final PdfReader reader;
060    
061    public PdfReaderContentParser(PdfReader reader) {
062        this.reader = reader;
063    }
064
065    /**
066     * Processes content from the specified page number using the specified listener
067     * @param <E> the type of the renderListener - this makes it easy to chain calls
068     * @param pageNumber the page number to process
069     * @param renderListener the listener that will receive render callbacks
070     * @return the provided renderListener
071     * @throws IOException if operations on the reader fail
072     */
073    
074    public <E extends RenderListener> E processContent(int pageNumber, E renderListener) throws IOException{
075        PdfDictionary pageDic = reader.getPageN(pageNumber);
076        PdfDictionary resourcesDic = pageDic.getAsDict(PdfName.RESOURCES);
077        
078        PdfContentStreamProcessor processor = new PdfContentStreamProcessor(renderListener);
079        processor.processContent(ContentByteUtils.getContentBytesForPage(reader, pageNumber), resourcesDic);        
080        return renderListener;
081
082    }
083}