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b6fb239e74
some file types are containers for several files. These containers had been parsed in such a way that the set of resulting parsed content was merged into one single document before parsing. Using this parser infrastructure it is not possible to parse document containers that contain individual files. An example is a rss file where the rss messages can be treated as individual documents with their own url reference. Another example is a surrogate file which was treated with a special operation outside of the parser infrastructure. This commit introduces a redesigned parser interface and a new abstract parser implementation. The new parser interface has now only one entry point and returns always a set of parsed documents. In case of single documents the parser method returns a set of one documents. To be compliant with the new interface, the zip and tar parser had been also completely redesigned. All parsers are now much more simple and cleaner in its structure. The switchboard operations had been extended to operate with sets of parsed files, not single parsed files. additionally, parsing of jar manifest files had been added. git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@6955 6c8d7289-2bf4-0310-a012-ef5d649a1542
99 lines
4.0 KiB
Java
99 lines
4.0 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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* 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.IOException;
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import java.io.InputStream;
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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.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.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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public tarParser() {
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super("Tape Archive File Parser");
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SUPPORTED_EXTENSIONS.add("tar");
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SUPPORTED_MIME_TYPES.add("application/x-tar");
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SUPPORTED_MIME_TYPES.add("application/tar");
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SUPPORTED_MIME_TYPES.add("applicaton/x-gtar");
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SUPPORTED_MIME_TYPES.add("multipart/x-tar");
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}
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public Document[] parse(final MultiProtocolURI url, final String mimeType, final String charset, InputStream source) throws Parser.Failure, InterruptedException {
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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 (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(MultiProtocolURI.newURL(url,"#" + name), mime, null, tmp);
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} catch (final Parser.Failure e) {
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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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if (subDocs == null) continue;
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for (Document d: subDocs) docacc.add(d);
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} catch (IOException e) {
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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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}
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