mirror of
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daf0f74361
search profiling showed, that a major amount of time is wasted by computing url hashes. The computation does an intranet-check, which needs a DNS lookup. This caused that each urlhash computation needed 100-200 milliseconds, which caused remote searches to delay at least 1 second more that necessary. The solution to this problem is to attach a URL hash to the URL data structure, because that means that the url hash value can be filled after retrieval of the URL from the database. The redesign of the url/urlhash management caused a major redesign of many parts of the software. Since some parts had been decided to be given up they had been removed during this change to avoid unnecessary maintenance of unused code. git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@4074 6c8d7289-2bf4-0310-a012-ef5d649a1542
204 lines
8.9 KiB
Java
204 lines
8.9 KiB
Java
//rssParser.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.rss;
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import java.io.ByteArrayInputStream;
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import java.io.InputStream;
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import java.io.Writer;
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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 de.anomic.htmlFilter.htmlFilterAbstractScraper;
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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.htmlFilter.htmlFilterWriter;
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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.serverCharBuffer;
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import de.anomic.server.serverFileUtils;
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import de.anomic.xml.rssReader;
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import de.anomic.xml.rssReader.Item;
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import de.anomic.yacy.yacyURL;
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public class rssParser 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 SUPPORTED_MIME_TYPES = new Hashtable();
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static {
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SUPPORTED_MIME_TYPES.put("text/rss","xml,rss,rdf");
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SUPPORTED_MIME_TYPES.put("application/rdf+xml","xml,rss,rdf");
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SUPPORTED_MIME_TYPES.put("application/rss+xml","xml,rss,rdf");
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SUPPORTED_MIME_TYPES.put("application/atom+xml","xml,atom");
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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 rssParser() {
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super(LIBX_DEPENDENCIES);
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this.parserName = "Rich Site Summary/Atom Feed Parser";
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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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try {
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LinkedList feedSections = new LinkedList();
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HashMap anchors = new HashMap();
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TreeSet images = new TreeSet();
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serverByteBuffer text = new serverByteBuffer();
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serverCharBuffer authors = new serverCharBuffer();
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rssReader reader = new rssReader(source);
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// getting the rss feed title and description
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String feedTitle = reader.getChannel().getTitle();
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// getting feed creator
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String feedCreator = reader.getChannel().getAuthor();
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if (feedCreator != null && feedCreator.length() > 0) authors.append(",").append(feedCreator);
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// getting the feed description
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String feedDescription = reader.getChannel().getDescription();
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if (reader.getImage() != null) {
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images.add(new htmlFilterImageEntry(new yacyURL(reader.getImage(), null), feedTitle, -1, -1));
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}
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// loop through the feed items
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for (int i = 0; i < reader.items(); i++) {
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// check for interruption
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checkInterruption();
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// getting the next item
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Item item = reader.getItem(i);
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String itemTitle = item.getTitle();
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yacyURL itemURL = new yacyURL(item.getLink(), null);
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String itemDescr = item.getDescription();
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String itemCreator = item.getCreator();
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if (itemCreator != null && itemCreator.length() > 0) authors.append(",").append(itemCreator);
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feedSections.add(itemTitle);
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anchors.put(itemURL.toString(),itemTitle);
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if ((text.length() != 0) && (text.byteAt(text.length() - 1) != 32)) text.append((byte) 32);
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text.append(new serverCharBuffer(htmlFilterAbstractScraper.stripAll(new serverCharBuffer(itemDescr.toCharArray()))).trim().toString()).append(' ');
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String itemContent = item.getDescription();
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if ((itemContent != null) && (itemContent.length() > 0)) {
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htmlFilterContentScraper scraper = new htmlFilterContentScraper(itemURL);
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Writer writer = new htmlFilterWriter(null, null, scraper, null, false);
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serverFileUtils.copy(new ByteArrayInputStream(itemContent.getBytes("UTF-8")), writer, "UTF-8");
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String itemHeadline = scraper.getTitle();
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if ((itemHeadline != null) && (itemHeadline.length() > 0)) {
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feedSections.add(itemHeadline);
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}
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Map itemLinks = scraper.getAnchors();
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if ((itemLinks != null) && (itemLinks.size() > 0)) {
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anchors.putAll(itemLinks);
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}
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TreeSet itemImages = scraper.getImages();
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if ((itemImages != null) && (itemImages.size() > 0)) {
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images.addAll(itemImages);
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}
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byte[] extractedText = scraper.getText();
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if ((extractedText != null) && (extractedText.length > 0)) {
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if ((text.length() != 0) && (text.byteAt(text.length() - 1) != 32)) text.append((byte) 32);
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text.append(scraper.getText());
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}
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}
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}
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plasmaParserDocument theDoc = new plasmaParserDocument(
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location,
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mimeType,
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"UTF-8",
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null,
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feedTitle,
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(authors.length() > 0)?authors.toString(1,authors.length()):"",
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(String[]) feedSections.toArray(new String[feedSections.size()]),
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feedDescription,
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text.getBytes(),
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anchors,
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images);
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return theDoc;
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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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throw new ParserException("Unexpected error while parsing rss file." + e.getMessage(),location);
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}
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}
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public Hashtable getSupportedMimeTypes() {
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return SUPPORTED_MIME_TYPES;
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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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