/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package org.jab.docsearch.converters;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.io.Writer;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Layout;
import org.pdfbox.pdfparser.PDFParser;
import org.pdfbox.pdmodel.PDDocument;
import org.pdfbox.pdmodel.PDDocumentInformation;
import org.pdfbox.pdmodel.encryption.AccessPermission;
import org.pdfbox.util.PDFTextStripper;
/**
* This class extract text of PDF document
*
* @version $Id: PDFConverter.java 147 2009-11-16 17:58:10Z henschel $
*/
public class PDFConverter
extends AbstractConverter
implements ConverterInterface {
private final String filename;
/**
* Cronstructor
*
* @param fileName PDF file
*/
public PDFConverter(String fileName) {
this.filename = fileName;
}
/**
* @see ConverterInterface#parse()
*/
public void parse()
throws ConverterException {
if (StringUtils.isEmpty(filename)) {
log.error("parse() filename is null");
throw new ConverterException("PDFConverter::parse() filename is null");
}
// PD Document
PDDocument document = null;
Writer output = null;
try {
document = getPDDocument();
// check document is readable
AccessPermission ap = document.getCurrentAccessPermission();
if (! ap.canExtractContent()) {
log.info("parse() Document (" + filename + ") isn't readable for DocSearcher.");
throw new ConverterException("parse() can't read PDF file");
}
// write the text to temp file
try {
log.debug("parse() Attempting to extract text from (" + filename + ")");
output = new StringWriter();
PDFTextStripper stripper = new PDFTextStripper();
stripper.writeText(document, output);
log.debug("parse() Successfully stripped out text from (" + filename + ")");
}
catch (IOException ioe) {
log.error("parse() failed", ioe);
throw new ConverterException("PDFConverter::parse() failed", ioe);
}
// get the meta data
PDDocumentInformation info = document.getDocumentInformation();
documentTitle = info.getTitle();
documentAuthor = info.getAuthor();
documentKeywords = info.getKeywords();
if (document != null) {
documentText = output.toString();
}
}
catch (IOException ioe) {
log.error("parse() failed", ioe);
throw new ConverterException("parse() failed", ioe);
}
finally {
// close stream
IOUtils.closeQuietly(output);
// close document
try {
if (document != null) {
document.close();
}
}
catch (IOException ioe) {
log.fatal("parse() can't close PDDocument", ioe);
}
}
if (log.isDebugEnabled()) {
log.debug("parse() PDF file='" + filename + "'" + Layout.LINE_SEP +
"title='" + documentTitle + "'" + Layout.LINE_SEP +
"author='" + documentAuthor + "'" + Layout.LINE_SEP +
"keywords='" + documentKeywords + "'");
}
}
/**
* Method parseDocument
*
* @return PDDocument
* @throws IOException if error
*/
private PDDocument getPDDocument()
throws IOException {
InputStream input = null;
try {
// get file as stream
input = new FileInputStream(filename);
// init PDFParser with stream
PDFParser parser = new PDFParser(input);
parser.setTempDirectory(new File(System.getProperty("java.io.tmpdir")));
// parse
parser.parse();
// return Document
return parser.getPDDocument();
}
finally {
IOUtils.closeQuietly(input);
}
}
}