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2fcf6f104c
- Bzip2Inputstream checks magic byte itself to identify bz2 (leave it in input) - try to suppy fitting mime for parsing bz2 content
108 lines
4.3 KiB
Java
108 lines
4.3 KiB
Java
//bzipParser.java
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//------------------------
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//part of YaCy
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//(C) by Michael Peter Christen; mc@yacy.net
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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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//
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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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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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package net.yacy.document.parser;
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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 net.yacy.cora.document.id.AnchorURL;
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import net.yacy.cora.document.id.DigestURL;
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import net.yacy.document.AbstractParser;
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import net.yacy.document.Document;
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import net.yacy.document.Parser;
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import net.yacy.document.TextParser;
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import net.yacy.document.VocabularyScraper;
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import net.yacy.kelondro.util.FileUtils;
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import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
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import org.apache.commons.compress.compressors.bzip2.BZip2Utils;
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public class bzipParser extends AbstractParser implements Parser {
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public bzipParser() {
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super("Bzip 2 UNIX Compressed File Parser");
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this.SUPPORTED_EXTENSIONS.add("bz2");
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this.SUPPORTED_EXTENSIONS.add("tbz");
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this.SUPPORTED_EXTENSIONS.add("tbz2");
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this.SUPPORTED_MIME_TYPES.add("application/x-bzip2");
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this.SUPPORTED_MIME_TYPES.add("application/bzip2");
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this.SUPPORTED_MIME_TYPES.add("application/x-bz2");
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this.SUPPORTED_MIME_TYPES.add("application/x-bzip");
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this.SUPPORTED_MIME_TYPES.add("application/x-stuffit");
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}
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@Override
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public Document[] parse(
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final AnchorURL location,
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final String mimeType,
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final String charset,
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final VocabularyScraper scraper,
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final int timezoneOffset,
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final InputStream source)
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throws Parser.Failure, InterruptedException {
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File tempFile = null;
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Document[] docs;
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try {
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int read = 0;
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final byte[] data = new byte[1024];
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// BZip2CompressorInputStream checks filecontent (magic start-bytes "BZh") and throws ioexception if no match
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final BZip2CompressorInputStream zippedContent = new BZip2CompressorInputStream(source);
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tempFile = File.createTempFile("bunzip","tmp");
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tempFile.deleteOnExit();
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// creating a temp file to store the uncompressed data
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final FileOutputStream out = new FileOutputStream(tempFile);
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// reading gzip file and store it uncompressed
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while((read = zippedContent.read(data, 0, 1024)) != -1) {
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out.write(data, 0, read);
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}
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zippedContent.close();
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out.close();
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// creating a new parser class to parse the unzipped content
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final String contentfilename = BZip2Utils.getUncompressedFilename(location.getFileName());
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final String mime = TextParser.mimeOf(DigestURL.getFileExtension(contentfilename));
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docs = TextParser.parseSource(location, mime, null, scraper, timezoneOffset, 999, tempFile);
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// TODO: this could return null from content parsing, even if bz2 successful read (see zipParser for alternative coding)
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} catch (final Exception e) {
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if (e instanceof InterruptedException) throw (InterruptedException) e;
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if (e instanceof Parser.Failure) throw (Parser.Failure) e;
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throw new Parser.Failure("Unexpected error while parsing bzip file. " + e.getMessage(),location);
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} finally {
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if (tempFile != null) FileUtils.deletedelete(tempFile);
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}
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return docs;
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}
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}
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