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110 lines
4.1 KiB
110 lines
4.1 KiB
//gzipParser.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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//last major change: 24.04.2005
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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.plasma.parser.gzip;
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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.Hashtable;
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import java.util.zip.GZIPInputStream;
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import de.anomic.plasma.plasmaParser;
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import de.anomic.plasma.plasmaParserDocument;
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import de.anomic.plasma.parser.AbstractParser;
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import de.anomic.plasma.parser.Parser;
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import de.anomic.plasma.parser.ParserException;
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import de.anomic.yacy.yacyURL;
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public class gzipParser extends AbstractParser implements Parser {
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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 Hashtable<String, String> SUPPORTED_MIME_TYPES = new Hashtable<String, String>();
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static {
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SUPPORTED_MIME_TYPES.put("application/x-gzip","gz,tgz");
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SUPPORTED_MIME_TYPES.put("application/gzip","gz,tgz");
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}
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/**
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* a list of library names that are needed by this parser
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* @see Parser#getLibxDependences()
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*/
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private static final String[] LIBX_DEPENDENCIES = new String[] {};
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public gzipParser() {
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super(LIBX_DEPENDENCIES);
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this.parserName = "GNU Zip Compressed Archive Parser";
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}
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public Hashtable<String, String> getSupportedMimeTypes() {
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return SUPPORTED_MIME_TYPES;
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}
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public plasmaParserDocument 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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int read = 0;
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final byte[] data = new byte[1024];
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final GZIPInputStream zippedContent = new GZIPInputStream(source);
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tempFile = File.createTempFile("gunzip","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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final plasmaParser theParser = new plasmaParser();
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return theParser.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 gzip file. " + e.getMessage(),location);
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} finally {
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if (tempFile != null) tempFile.delete();
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}
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}
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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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