com.lowagie.text.pdf.parser.PdfTextExtractor Maven / Gradle / Ivy
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Itext is a java library to create and manipulate PDFs.
This is a fork of version 2.1.7 the last MPL/LGPL version.
It's focused basically on mantain compatibility with newer bouncycastle releases and small bugfixes.
/*
* Copyright 2008 by Kevin Day.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (the "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999-2008 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000-2008 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library 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 Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.lowagie.text.pdf.parser;
import java.io.IOException;
import com.lowagie.text.pdf.PdfDictionary;
import com.lowagie.text.pdf.PdfName;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.RandomAccessFileOrArray;
/**
* Extracts text from a PDF file.
* @since 2.1.4
*/
public class PdfTextExtractor {
/** The PdfReader that holds the PDF file. */
private final PdfReader reader;
/** The processor that will extract the text. */
private final SimpleTextExtractingPdfContentStreamProcessor extractionProcessor;
/**
* Creates a new Text Extractor object.
* @param reader the reader with the PDF
*/
public PdfTextExtractor(PdfReader reader) {
this.reader = reader;
extractionProcessor = new SimpleTextExtractingPdfContentStreamProcessor();
}
/**
* Gets the content stream of a page.
* @param pageNum the page number of page you want get the content stream from
* @return a byte array with the content stream of a page
* @throws IOException
*/
private byte[] getContentBytesForPage(int pageNum) throws IOException {
RandomAccessFileOrArray f = reader.getSafeFile();
byte[] contentBytes = reader.getPageContent(pageNum, f);
f.close();
return contentBytes;
}
/**
* Gets the text from a page.
* @param page the page number of the page
* @return a String with the content as plain text (without PDF syntax)
* @throws IOException
*/
public String getTextFromPage(int page) throws IOException {
int totalPages = reader.getNumberOfPages();
if (totalPages < page) {
throw new IOException("indicated page does not exists, requested page " + page + " document pages " + totalPages);
}
if (page <= 0) {
throw new IOException("page number must be postive:" + page);
}
PdfDictionary pageDic = reader.getPageN(page);
PdfDictionary resourcesDic = pageDic.getAsDict(PdfName.RESOURCES);
extractionProcessor.processContent(getContentBytesForPage(page), resourcesDic);
return extractionProcessor.getResultantText();
}
}