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255 lines
11 KiB
255 lines
11 KiB
//tarParser.java
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//------------------------
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//part of YaCy
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//(C) by Michael Peter Christen; mc@anomic.de
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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: 16.05.2005
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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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//
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//Using this software in any meaning (reading, learning, copying, compiling,
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//running) means that you agree that the Author(s) is (are) not responsible
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//for cost, loss of data or any harm that may be caused directly or indirectly
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//by usage of this softare or this documentation. The usage of this software
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//is on your own risk. The installation and usage (starting/running) of this
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//software may allow other people or application to access your computer and
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//any attached devices and is highly dependent on the configuration of the
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//software which must be done by the user of the software; the author(s) is
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//(are) also not responsible for proper configuration and usage of the
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//software, even if provoked by documentation provided together with
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//the software.
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//
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//Any changes to this file according to the GPL as documented in the file
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//gpl.txt aside this file in the shipment you received can be done to the
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//lines that follows this copyright notice here, but changes must not be
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//done inside the copyright notive above. A re-distribution must contain
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//the intact and unchanged copyright notice.
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//Contributions and changes to the program code must be marked as such.
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package de.anomic.plasma.parser.tar;
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import java.io.BufferedOutputStream;
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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.io.OutputStream;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Hashtable;
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import java.util.LinkedList;
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import java.util.Map;
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import java.util.TreeSet;
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import java.util.zip.GZIPInputStream;
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import com.ice.tar.TarEntry;
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import com.ice.tar.TarInputStream;
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import de.anomic.htmlFilter.htmlFilterImageEntry;
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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.server.serverByteBuffer;
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import de.anomic.server.serverFileUtils;
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import de.anomic.yacy.yacyURL;
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public class tarParser 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-tar","tar");
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SUPPORTED_MIME_TYPES.put("application/tar","tar");
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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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// "tar.jar"
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};
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public tarParser() {
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super(LIBX_DEPENDENCIES);
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this.parserName = "Tape Archive File 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(yacyURL location, String mimeType, String charset, InputStream source) throws ParserException, InterruptedException {
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long docTextLength = 0;
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OutputStream docText = null;
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File outputFile = null;
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plasmaParserDocument subDoc = null;
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try {
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if ((this.contentLength == -1) || (this.contentLength > Parser.MAX_KEEP_IN_MEMORY_SIZE)) {
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outputFile = File.createTempFile("zipParser",".tmp");
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docText = new BufferedOutputStream(new FileOutputStream(outputFile));
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} else {
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docText = new serverByteBuffer();
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}
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// creating a new parser class to parse the unzipped content
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plasmaParser theParser = new plasmaParser();
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/*
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* If the mimeType was not reported correcly by the webserve we
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* have to decompress it first
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*/
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String ext = plasmaParser.getFileExt(location).toLowerCase();
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if (ext.equals("gz") || ext.equals("tgz")) {
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source = new GZIPInputStream(source);
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}
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// TODO: what about bzip ....
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StringBuffer docKeywords = new StringBuffer();
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StringBuffer docLongTitle = new StringBuffer();
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LinkedList<String> docSections = new LinkedList<String>();
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StringBuffer docAbstrct = new StringBuffer();
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Map<yacyURL, String> docAnchors = new HashMap<yacyURL, String>();
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TreeSet<htmlFilterImageEntry> docImages = new TreeSet<htmlFilterImageEntry>();
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// looping through the contained files
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TarEntry entry;
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TarInputStream tin = new TarInputStream(source);
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while ((entry = tin.getNextEntry()) !=null) {
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// check for interruption
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checkInterruption();
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// skip directories
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if (entry.isDirectory()) continue;
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// Get the short entry name
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String entryName = entry.getName();
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// getting the entry file extension
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int idx = entryName.lastIndexOf(".");
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String entryExt = (idx > -1) ? entryName.substring(idx+1) : "";
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// trying to determine the mimeType per file extension
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String entryMime = plasmaParser.getMimeTypeByFileExt(entryExt);
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// getting the entry content
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File subDocTempFile = null;
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try {
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// create the temp file
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subDocTempFile = createTempFile(entryName);
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// copy the data into the file
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serverFileUtils.copy(tin,subDocTempFile,entry.getSize());
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// check for interruption
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checkInterruption();
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// parsing the content
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subDoc = theParser.parseSource(yacyURL.newURL(location,"#" + entryName),entryMime,null,subDocTempFile);
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} catch (ParserException e) {
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this.theLogger.logInfo("Unable to parse tar file entry '" + entryName + "'. " + e.getMessage());
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} finally {
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if (subDocTempFile != null) try {subDocTempFile.delete(); } catch(Exception ex){/* ignore this */}
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}
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if (subDoc == null) continue;
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// merging all documents together
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if (docKeywords.length() > 0) docKeywords.append(",");
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docKeywords.append(subDoc.dc_subject(','));
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if (docLongTitle.length() > 0) docLongTitle.append("\n");
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docLongTitle.append(subDoc.dc_title());
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docSections.addAll(Arrays.asList(subDoc.getSectionTitles()));
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if (docAbstrct.length() > 0) docAbstrct.append("\n");
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docAbstrct.append(subDoc.dc_description());
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if (subDoc.getTextLength() > 0) {
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if (docTextLength > 0) docText.write('\n');
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docTextLength += serverFileUtils.copy(subDoc.getText(), docText);
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}
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docAnchors.putAll(subDoc.getAnchors());
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docImages.addAll(subDoc.getImages());
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// release subdocument
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subDoc.close();
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subDoc = null;
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}
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plasmaParserDocument result = null;
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if (docText instanceof serverByteBuffer) {
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result = new plasmaParserDocument(
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location,
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mimeType,
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null,
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docKeywords.toString().split(" |,"),
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docLongTitle.toString(),
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"", // TODO: AUTHOR
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(String[])docSections.toArray(new String[docSections.size()]),
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docAbstrct.toString(),
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((serverByteBuffer)docText).getBytes(),
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docAnchors,
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docImages);
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} else {
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result = new plasmaParserDocument(
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location,
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mimeType,
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null,
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docKeywords.toString().split(" |,"),
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docLongTitle.toString(),
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"", // TODO: AUTHOR
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(String[])docSections.toArray(new String[docSections.size()]),
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docAbstrct.toString(),
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outputFile,
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docAnchors,
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docImages);
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}
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return result;
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} catch (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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if (subDoc != null) subDoc.close();
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// close the writer
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if (docText != null) try { docText.close(); } catch (Exception ex) {/* ignore this */}
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// delete the file
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if (outputFile != null) try { outputFile.delete(); } catch (Exception ex) {/* ignore this */}
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throw new ParserException("Unexpected error while parsing tar resource. " + e.getMessage(),location);
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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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