mirror of
https://github.com/yacy/yacy_search_server.git
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5fc6524ca8
later - added abstract add, delete, get methods in the triplestore - added generation of triples after auto-annotation - migrated all MultiProtocolURI objects to DigestURI in the parser since the url hash is needed as subject value in the triples in the triple store
124 lines
4.9 KiB
Java
124 lines
4.9 KiB
Java
/**
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* tarParser
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* Copyright 2010 by Michael Peter Christen, mc@yacy.net, Frankfurt am Main, Germany
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* First released 29.6.2010 at http://yacy.net
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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 library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program in the file lgpl21.txt
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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package net.yacy.document.parser;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.RandomAccessFile;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.zip.GZIPInputStream;
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import net.yacy.cora.document.MultiProtocolURI;
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import net.yacy.cora.document.UTF8;
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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.kelondro.data.meta.DigestURI;
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import net.yacy.kelondro.util.FileUtils;
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import org.apache.tools.tar.TarEntry;
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import org.apache.tools.tar.TarInputStream;
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// this is a new implementation of this parser idiom using multiple documents as result set
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public class tarParser extends AbstractParser implements Parser {
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private final static String MAGIC = "ustar"; // A magic for a tar archive, may appear at #101h-#105
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public tarParser() {
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super("Tape Archive File Parser");
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this.SUPPORTED_EXTENSIONS.add("tar");
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this.SUPPORTED_MIME_TYPES.add("application/x-tar");
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this.SUPPORTED_MIME_TYPES.add("application/tar");
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this.SUPPORTED_MIME_TYPES.add("applicaton/x-gtar");
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this.SUPPORTED_MIME_TYPES.add("multipart/x-tar");
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}
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@Override
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public Document[] parse(final DigestURI url, final String mimeType, final String charset, InputStream source) throws Parser.Failure, InterruptedException {
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final List<Document> docacc = new ArrayList<Document>();
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Document[] subDocs = null;
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final String ext = url.getFileExtension().toLowerCase();
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if (ext.equals("gz") || ext.equals("tgz")) {
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try {
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source = new GZIPInputStream(source);
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} catch (final IOException e) {
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throw new Parser.Failure("tar parser: " + e.getMessage(), url);
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}
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}
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TarEntry entry;
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final TarInputStream tis = new TarInputStream(source);
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File tmp = null;
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// loop through the elements in the tar file and parse every single file inside
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while (true) {
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try {
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if (tis.available() <= 0) break;
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entry = tis.getNextEntry();
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if (entry == null) break;
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if (entry.isDirectory() || entry.getSize() <= 0) continue;
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final String name = entry.getName();
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final int idx = name.lastIndexOf('.');
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final String mime = TextParser.mimeOf((idx > -1) ? name.substring(idx+1) : "");
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try {
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tmp = FileUtils.createTempFile(this.getClass(), name);
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FileUtils.copy(tis, tmp, entry.getSize());
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subDocs = TextParser.parseSource(new DigestURI(MultiProtocolURI.newURL(url,"#" + name)), mime, null, tmp);
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if (subDocs == null) continue;
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for (final Document d: subDocs) docacc.add(d);
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} catch (final Parser.Failure e) {
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this.log.logWarning("tar parser entry " + name + ": " + e.getMessage());
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} finally {
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if (tmp != null) FileUtils.deletedelete(tmp);
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}
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} catch (final IOException e) {
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this.log.logWarning("tar parser:" + e.getMessage());
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break;
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}
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}
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return docacc.toArray(new Document[docacc.size()]);
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}
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public final static boolean isTar(File f) {
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if (!f.exists() || f.length() < 0x105) return false;
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try {
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RandomAccessFile raf = new RandomAccessFile(f, "r");
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raf.seek(0x101);
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byte[] b = new byte[5];
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raf.read(b);
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return MAGIC.equals(UTF8.String(b));
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} catch (FileNotFoundException e) {
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return false;
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} catch (IOException e) {
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return false;
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}
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}
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}
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