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207 lines
8.4 KiB
207 lines
8.4 KiB
//pdfParser.java
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//------------------------
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//part of YaCy
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//(C) by Michael Peter Christen; mc@anomic.de
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//first published on http://www.anomic.de
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//Frankfurt, Germany, 2005
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//
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//this file is contributed by Martin Thelian
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//last major change: 24.04.2005
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//
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//This program is free software; you can redistribute it and/or modify
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//it under the terms of the GNU General Public License as published by
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//the Free Software Foundation; either version 2 of the License, or
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//(at your option) any later version.
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//
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//This program is distributed in the hope that it will be useful,
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//but WITHOUT ANY WARRANTY; without even the implied warranty of
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//GNU General Public License for more details.
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//
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//You should have received a copy of the GNU General Public License
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//along with this program; if not, write to the Free Software
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//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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//Using this software in any meaning (reading, learning, copying, compiling,
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//running) means that you agree that the Author(s) is (are) not responsible
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//for cost, loss of data or any harm that may be caused directly or indirectly
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//by usage of this softare or this documentation. The usage of this software
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//is on your own risk. The installation and usage (starting/running) of this
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//software may allow other people or application to access your computer and
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//any attached devices and is highly dependent on the configuration of the
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//software which must be done by the user of the software; the author(s) is
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//(are) also not responsible for proper configuration and usage of the
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//software, even if provoked by documentation provided together with
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//the software.
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//
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//Any changes to this file according to the GPL as documented in the file
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//gpl.txt aside this file in the shipment you received can be done to the
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//lines that follows this copyright notice here, but changes must not be
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//done inside the copyright notive above. A re-distribution must contain
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//the intact and unchanged copyright notice.
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//Contributions and changes to the program code must be marked as such.
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package de.anomic.plasma.parser.pdf;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.InputStream;
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import java.io.OutputStreamWriter;
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import java.io.Writer;
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import java.util.Hashtable;
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import org.pdfbox.pdfparser.PDFParser;
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import org.pdfbox.pdmodel.PDDocument;
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import org.pdfbox.pdmodel.PDDocumentInformation;
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import org.pdfbox.util.PDFTextStripper;
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import de.anomic.net.URL;
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import de.anomic.plasma.plasmaCrawlEURL;
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import de.anomic.plasma.plasmaParserDocument;
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import de.anomic.plasma.parser.AbstractParser;
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import de.anomic.plasma.parser.Parser;
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import de.anomic.plasma.parser.ParserException;
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import de.anomic.server.serverCharBuffer;
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public class pdfParser extends AbstractParser implements Parser {
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/**
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* a list of mime types that are supported by this parser class
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* @see #getSupportedMimeTypes()
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*/
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public static final Hashtable SUPPORTED_MIME_TYPES = new Hashtable();
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static { SUPPORTED_MIME_TYPES.put("application/pdf","pdf"); }
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/**
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* a list of library names that are needed by this parser
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* @see Parser#getLibxDependences()
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*/
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private static final String[] LIBX_DEPENDENCIES = new String[] {
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"PDFBox-0.7.2.jar"
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};
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public pdfParser() {
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super(LIBX_DEPENDENCIES);
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this.parserName = "Acrobat Portable Document Parser";
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}
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public Hashtable getSupportedMimeTypes() {
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return SUPPORTED_MIME_TYPES;
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}
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public plasmaParserDocument parse(URL location, String mimeType, String charset, InputStream source) throws ParserException, InterruptedException {
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PDDocument theDocument = null;
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Writer writer = null;
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File writerFile = null;
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try {
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// reducing thread priority
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Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
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// deactivating the logging for jMimeMagic
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// Logger theLogger = Logger.getLogger("org.pdfbox");
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// theLogger.setLevel(Level.INFO);
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String docTitle = null, docSubject = null, docAuthor = null, docKeywordStr = null;
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// check for interruption
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checkInterruption();
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// creating a pdf parser
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PDFParser parser = new PDFParser(source);
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parser.parse();
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// check for interruption
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checkInterruption();
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// creating a text stripper
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PDFTextStripper stripper = new PDFTextStripper();
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theDocument = parser.getPDDocument();
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if (theDocument.isEncrypted()) {
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throw new ParserException("Document is encrypted",location,plasmaCrawlEURL.DENIED_DOCUMENT_ENCRYPTED);
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}
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// extracting some metadata
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PDDocumentInformation theDocInfo = theDocument.getDocumentInformation();
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if (theDocInfo != null) {
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docTitle = theDocInfo.getTitle();
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docSubject = theDocInfo.getSubject();
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docAuthor = theDocInfo.getAuthor();
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docKeywordStr = theDocInfo.getKeywords();
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}
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// creating a writer for output
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if ((this.contentLength == -1) || (this.contentLength > Parser.MAX_KEEP_IN_MEMORY_SIZE)) {
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writerFile = File.createTempFile("pdfParser",".tmp");
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writer = new OutputStreamWriter(new FileOutputStream(writerFile),"UTF-8");
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} else {
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writer = new serverCharBuffer();
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}
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stripper.writeText(theDocument, writer );
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theDocument.close(); theDocument = null;
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writer.close();
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String[] docKeywords = null;
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if (docKeywordStr != null) docKeywords = docKeywordStr.split(" |,");
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plasmaParserDocument theDoc = null;
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if (writer instanceof serverCharBuffer) {
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byte[] contentBytes = ((serverCharBuffer)writer).toString().getBytes("UTF-8");
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theDoc = new plasmaParserDocument(
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location,
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mimeType,
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"UTF-8",
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docKeywords,
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(docTitle == null) ? docSubject : docTitle,
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docAuthor,
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null,
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null,
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contentBytes,
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null,
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null);
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} else {
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theDoc = new plasmaParserDocument(
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location,
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mimeType,
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"UTF-8",
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docKeywords,
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(docTitle == null) ? docSubject : docTitle,
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docAuthor,
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null,
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null,
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writerFile,
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null,
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null);
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}
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return theDoc;
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}
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catch (Exception e) {
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if (e instanceof InterruptedException) throw (InterruptedException) e;
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if (e instanceof ParserException) throw (ParserException) e;
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// close the writer
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if (writer != null) try { writer.close(); } catch (Exception ex) {/* ignore this */}
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// delete the file
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if (writerFile != null) try { writerFile.delete(); } catch (Exception ex) {/* ignore this */}
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throw new ParserException("Unexpected error while parsing pdf file. " + e.getMessage(),location);
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} finally {
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if (theDocument != null) try { theDocument.close(); } catch (Exception e) {/* ignore this */}
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if (writer != null) try { writer.close(); } catch (Exception e) {/* ignore this */}
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Thread.currentThread().setPriority(Thread.NORM_PRIORITY);
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}
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}
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public void reset() {
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// Nothing todo here at the moment
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super.reset();
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}
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}
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