com.itextpdf.text.pdf.parser.PdfReaderContentParser Maven / Gradle / Ivy
/*
* $Id: ad4c69485fdf30885f190772b57264b036b25e77 $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2016 iText Group NV
* Authors: Bruno Lowagie, Kevin Day, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
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*/
package com.itextpdf.text.pdf.parser;
import java.io.IOException;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfReader;
import java.util.HashMap;
import java.util.Map;
/**
* A utility class that makes it cleaner to process content from pages of a PdfReader
* through a specified RenderListener.
* @since 5.0.2
*/
public class PdfReaderContentParser {
/** the reader this parser will process */
private final PdfReader reader;
public PdfReaderContentParser(PdfReader reader) {
this.reader = reader;
}
/**
* Processes content from the specified page number using the specified listener.
* Also allows registration of custom ContentOperators
* @param the type of the renderListener - this makes it easy to chain calls
* @param pageNumber the page number to process
* @param renderListener the listener that will receive render callbacks
* @param additionalContentOperators an optional map of custom ContentOperators for rendering instructions
* @return the provided renderListener
* @throws IOException if operations on the reader fail
*/
public E processContent(int pageNumber, E renderListener, Map additionalContentOperators) throws IOException{
PdfDictionary pageDic = reader.getPageN(pageNumber);
PdfDictionary resourcesDic = pageDic.getAsDict(PdfName.RESOURCES);
PdfContentStreamProcessor processor = new PdfContentStreamProcessor(renderListener);
for(Map.Entry entry : additionalContentOperators.entrySet()) {
processor.registerContentOperator(entry.getKey(), entry.getValue());
}
processor.processContent(ContentByteUtils.getContentBytesForPage(reader, pageNumber), resourcesDic);
return renderListener;
}
/**
* Processes content from the specified page number using the specified listener
* @param the type of the renderListener - this makes it easy to chain calls
* @param pageNumber the page number to process
* @param renderListener the listener that will receive render callbacks
* @return the provided renderListener
* @throws IOException if operations on the reader fail
*
* @link PdfReaderContentParser#processContent(int, E, Map)
* {@code map} defaults to null.
*/
public E processContent(int pageNumber, E renderListener) throws IOException{
return processContent(pageNumber, renderListener, new HashMap());
}
}