//bzipParser.java
//------------------------
//part of YaCy
//(C) by Michael Peter Christen; mc@yacy.net
//first published on http://www.anomic.de
//Frankfurt, Germany, 2005
//
//this file is contributed by Martin Thelian
//
// $LastChangedDate: 2010-12-27 16:37:11 +0100 (Mo, 27. Dez 2010) $
// $LastChangedRevision: 7394 $
// $LastChangedBy: low012 $
//
//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 net.yacy.document.parser;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import net.yacy.cora.document.MultiProtocolURI;
import net.yacy.document.AbstractParser;
import net.yacy.document.Document;
import net.yacy.document.Parser;
import net.yacy.document.TextParser;
import net.yacy.kelondro.util.FileUtils;
import org.apache.tools.bzip2.CBZip2InputStream;
public class bzipParser extends AbstractParser implements Parser {
public bzipParser() {
super("Bzip 2 UNIX Compressed File Parser");
SUPPORTED_EXTENSIONS.add("bz2");
SUPPORTED_EXTENSIONS.add("tbz");
SUPPORTED_EXTENSIONS.add("tbz2");
SUPPORTED_MIME_TYPES.add("application/x-bzip2");
SUPPORTED_MIME_TYPES.add("application/bzip2");
SUPPORTED_MIME_TYPES.add("application/x-bz2");
SUPPORTED_MIME_TYPES.add("application/x-bzip");
SUPPORTED_MIME_TYPES.add("application/x-stuffit");
}
public Document[] parse(final MultiProtocolURI location, final String mimeType,
final String charset, final InputStream source)
throws Parser.Failure, InterruptedException {
File tempFile = null;
Document[] docs;
try {
/*
* First we have to consume the first two char from the stream. Otherwise
* the bzip decompression will fail with a nullpointerException!
*/
int b = source.read();
if (b != 'B') {
throw new Exception("Invalid bz2 content.");
}
b = source.read();
if (b != 'Z') {
throw new Exception("Invalid bz2 content.");
}
int read = 0;
final byte[] data = new byte[1024];
final CBZip2InputStream zippedContent = new CBZip2InputStream(source);
tempFile = File.createTempFile("bunzip","tmp");
tempFile.deleteOnExit();
// creating a temp file to store the uncompressed data
final FileOutputStream out = new FileOutputStream(tempFile);
// reading gzip file and store it uncompressed
while((read = zippedContent.read(data, 0, 1024)) != -1) {
out.write(data, 0, read);
}
zippedContent.close();
out.close();
// creating a new parser class to parse the unzipped content
docs = TextParser.parseSource(location, null, null, tempFile);
} catch (final Exception e) {
if (e instanceof InterruptedException) throw (InterruptedException) e;
if (e instanceof Parser.Failure) throw (Parser.Failure) e;
throw new Parser.Failure("Unexpected error while parsing bzip file. " + e.getMessage(),location);
} finally {
if (tempFile != null) FileUtils.deletedelete(tempFile);
}
return docs;
}
}