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132 lines
4.8 KiB
132 lines
4.8 KiB
//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 de.anomic.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 java.util.HashSet;
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import java.util.Set;
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import org.apache.tools.bzip2.CBZip2InputStream;
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import de.anomic.document.AbstractParser;
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import de.anomic.document.Idiom;
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import de.anomic.document.Parser;
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import de.anomic.document.ParserException;
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import de.anomic.document.Document;
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import de.anomic.kelondro.util.FileUtils;
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import de.anomic.yacy.yacyURL;
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public class bzipParser extends AbstractParser implements Idiom {
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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 Set<String> SUPPORTED_MIME_TYPES = new HashSet<String>();
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public static final Set<String> SUPPORTED_EXTENSIONS = new HashSet<String>();
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static {
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SUPPORTED_EXTENSIONS.add("bz2");
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SUPPORTED_EXTENSIONS.add("tbz");
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SUPPORTED_EXTENSIONS.add("tbz2");
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SUPPORTED_MIME_TYPES.add("application/x-bzip2");
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SUPPORTED_MIME_TYPES.add("application/bzip2");
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SUPPORTED_MIME_TYPES.add("application/x-bz2");
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SUPPORTED_MIME_TYPES.add("application/x-bzip");
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SUPPORTED_MIME_TYPES.add("application/x-stuffit");
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}
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public bzipParser() {
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super("Bzip 2 UNIX Compressed File Parser");
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}
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public Set<String> supportedMimeTypes() {
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return SUPPORTED_MIME_TYPES;
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}
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public Set<String> supportedExtensions() {
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return SUPPORTED_EXTENSIONS;
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}
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public Document parse(final yacyURL location, final String mimeType, final String charset, final InputStream source) throws ParserException, InterruptedException {
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File tempFile = null;
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try {
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/*
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* First we have to consume the first two char from the stream. Otherwise
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* the bzip decompression will fail with a nullpointerException!
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*/
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int b = source.read();
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if (b != 'B') {
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throw new Exception("Invalid bz2 content.");
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}
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b = source.read();
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if (b != 'Z') {
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throw new Exception("Invalid bz2 content.");
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}
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int read = 0;
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final byte[] data = new byte[1024];
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final CBZip2InputStream zippedContent = new CBZip2InputStream(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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// check for interruption
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checkInterruption();
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// creating a new parser class to parse the unzipped content
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return Parser.parseSource(location,null,null,tempFile);
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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 ParserException) throw (ParserException) e;
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throw new ParserException("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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}
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@Override
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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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