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222 lines
9.4 KiB
222 lines
9.4 KiB
//zipParser.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: 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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package de.anomic.plasma.parser.zip;
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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.zip.ZipEntry;
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import java.util.zip.ZipInputStream;
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import de.anomic.htmlFilter.htmlFilterContentScraper;
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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 zipParser 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/zip","zip");
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SUPPORTED_MIME_TYPES.put("application/x-zip","zip");
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SUPPORTED_MIME_TYPES.put("application/x-zip-compressed","zip");
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SUPPORTED_MIME_TYPES.put("application/java-archive","jar");
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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 zipParser() {
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super(LIBX_DEPENDENCIES);
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this.parserName = "Compressed 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(final yacyURL location, final String mimeType, final String charset, final 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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final StringBuffer docKeywords = new StringBuffer();
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final StringBuffer docLongTitle = new StringBuffer();
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final LinkedList<String> docSections = new LinkedList<String>();
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final StringBuffer docAbstrct = new StringBuffer();
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final Map<yacyURL, String> docAnchors = new HashMap<yacyURL, String>();
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final HashMap<String, htmlFilterImageEntry> docImages = new HashMap<String, htmlFilterImageEntry>();
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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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// looping through the contained files
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ZipEntry entry;
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final ZipInputStream zippedContent = new ZipInputStream(source);
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while ((entry = zippedContent.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 entry name
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final String entryName = entry.getName();
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final int idx = entryName.lastIndexOf(".");
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// getting the file extension
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final String entryExt = (idx > -1) ? entryName.substring(idx+1) : "";
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// trying to determine the mimeType per file extension
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final String entryMime = plasmaParser.getMimeTypeByFileExt(entryExt);
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// parsing the 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(zippedContent,subDocTempFile,entry.getSize());
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// parsing the zip file entry
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subDoc = theParser.parseSource(yacyURL.newURL(location,"#" + entryName),entryMime,null, subDocTempFile);
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} catch (final ParserException e) {
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this.theLogger.logInfo("Unable to parse zip file entry '" + entryName + "'. " + e.getMessage());
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} finally {
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if (subDocTempFile != null) try {subDocTempFile.delete(); } catch(final 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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htmlFilterContentScraper.addAllImages(docImages, 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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null,
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docKeywords.toString().split(" |,"),
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docLongTitle.toString(),
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"", // TODO: AUTHOR
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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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null,
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docKeywords.toString().split(" |,"),
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docLongTitle.toString(),
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"", // TODO: AUTHOR
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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 (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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if (subDoc != null) subDoc.close();
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// close the writer
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if (docText != null) try { docText.close(); } catch (final Exception ex) {/* ignore this */}
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// delete the file
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if (outputFile != null) try { outputFile.delete(); } catch (final Exception ex) {/* ignore this */}
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throw new ParserException("Unexpected error while parsing zip resource. " + e.getClass().getName() + ": "+ 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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