//gzipParser.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
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
//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 java.util.Date;
import java.util.zip.GZIPInputStream;
import net.yacy.cora.document.id.DigestURL;
import net.yacy.cora.document.id.MultiProtocolURL;
import net.yacy.document.AbstractParser;
import net.yacy.document.Document;
import net.yacy.document.Parser;
import net.yacy.document.TextParser;
import net.yacy.document.VocabularyScraper;
import net.yacy.kelondro.util.FileUtils;
import org.apache.commons.compress.compressors.gzip.GzipUtils;
/**
* Parses a gz archive.
* Unzips and parses the content and adds it to the created main document
*/
public class gzipParser extends AbstractParser implements Parser {
public gzipParser() {
super("GNU Zip Compressed Archive Parser");
this.SUPPORTED_EXTENSIONS.add("gz");
this.SUPPORTED_EXTENSIONS.add("tgz");
this.SUPPORTED_MIME_TYPES.add("application/x-gzip");
this.SUPPORTED_MIME_TYPES.add("application/gzip");
this.SUPPORTED_MIME_TYPES.add("application/x-gunzip");
this.SUPPORTED_MIME_TYPES.add("application/gzipped");
this.SUPPORTED_MIME_TYPES.add("application/gzip-compressed");
this.SUPPORTED_MIME_TYPES.add("gzip/document");
}
@Override
public Document[] parse(
final DigestURL location,
final String mimeType,
final String charset,
final VocabularyScraper scraper,
final int timezoneOffset,
final InputStream source) throws Parser.Failure, InterruptedException {
File tempFile = null;
Document maindoc = null;
try {
int read = 0;
final byte[] data = new byte[1024];
final GZIPInputStream zippedContent = new GZIPInputStream(source);
tempFile = File.createTempFile("gunzip","tmp");
// 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();
final String filename = location.getFileName();
// create maindoc for this gzip container, register with supplied url & mime
maindoc = new Document(
location,
mimeType,
charset,
this,
null,
null,
AbstractParser.singleList(filename.isEmpty() ? location.toTokens() : MultiProtocolURL.unescape(filename)), // title
null,
null,
null,
null,
0.0d, 0.0d,
(Object) null,
null,
null,
null,
false,
new Date());
// creating a new parser class to parse the unzipped content
final String contentfilename = GzipUtils.getUncompressedFilename(location.getFileName());
final String mime = TextParser.mimeOf(DigestURL.getFileExtension(contentfilename));
Document[] docs = TextParser.parseSource(location, mime, null, scraper, timezoneOffset, 999, tempFile);
if (docs != null) maindoc.addSubDocuments(docs);
} 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 gzip file. " + e.getMessage(),location);
} finally {
if (tempFile != null) FileUtils.deletedelete(tempFile);
}
return maindoc == null ? null : new Document[]{maindoc};
}
}