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}