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273 lines
12 KiB
273 lines
12 KiB
// MediaSnippet.java
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// -----------------
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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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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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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 net.yacy.search.snippet;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Comparator;
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import java.util.Date;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.SortedMap;
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import java.util.SortedSet;
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import java.util.TreeSet;
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import net.yacy.cora.document.ASCII;
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import net.yacy.cora.document.analysis.Classification;
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import net.yacy.cora.document.analysis.Classification.ContentDomain;
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import net.yacy.cora.federate.yacy.CacheStrategy;
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import net.yacy.cora.order.Base64Order;
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import net.yacy.cora.protocol.ClientIdentification;
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import net.yacy.cora.storage.HandleSet;
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import net.yacy.cora.util.ByteArray;
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import net.yacy.cora.util.ConcurrentLog;
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import net.yacy.cora.util.NumberTools;
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import net.yacy.cora.util.SpaceExceededException;
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import net.yacy.crawler.data.ZURL.FailCategory;
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import net.yacy.crawler.retrieval.Request;
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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.WordTokenizer;
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import net.yacy.document.parser.html.ImageEntry;
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import net.yacy.kelondro.data.meta.DigestURI;
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import net.yacy.kelondro.index.RowHandleSet;
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import net.yacy.repository.Blacklist.BlacklistType;
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import net.yacy.search.Switchboard;
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public class MediaSnippet implements Comparable<MediaSnippet>, Comparator<MediaSnippet> {
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public ContentDomain type;
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public DigestURI href, source;
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public String name, attr, mime;
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public long ranking;
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public int width, height;
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public long fileSize;
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public MediaSnippet(final ContentDomain type, final DigestURI href, final String mime, final String name, final long fileSize, final String attr, final long ranking, final DigestURI source) {
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this.type = type;
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this.href = href;
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this.mime = mime;
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this.fileSize = fileSize;
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this.source = source; // the web page where the media resource appeared
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this.name = name;
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this.attr = attr;
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this.width = -1;
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this.height = -1;
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int p = 0;
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if (attr != null && (p = attr.indexOf(" x ",0)) > 0) {
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this.width = NumberTools.parseIntDecSubstring(attr, 0, p);
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this.height = NumberTools.parseIntDecSubstring(attr, p + 3);
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}
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this.ranking = ranking; // the smaller the better! small values should be shown first
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if ((this.name == null) || (this.name.isEmpty())) this.name = "_";
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if ((this.attr == null) || (this.attr.isEmpty())) this.attr = "_";
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}
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public MediaSnippet(final ContentDomain type, final DigestURI href, final String mime, final String name, final long fileSize, final int width, final int height, final long ranking, final DigestURI source) {
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this.type = type;
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this.href = href;
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this.mime = mime;
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this.fileSize = fileSize;
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this.source = source; // the web page where the media resource appeared
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this.name = name;
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this.attr = width + " x " + height;
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this.width = width;
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this.height = height;
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this.ranking = ranking; // the smaller the better! small values should be shown first
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if ((this.name == null) || (this.name.isEmpty())) this.name = "_";
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if ((this.attr == null) || (this.attr.isEmpty())) this.attr = "_";
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}
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private int hashCache = Integer.MIN_VALUE; // if this is used in a compare method many times, a cache is useful
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@Override
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public int hashCode() {
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if (this.hashCache == Integer.MIN_VALUE) {
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this.hashCache = ByteArray.hashCode(this.href.hash());
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}
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return this.hashCache;
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}
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@Override
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public String toString() {
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return ASCII.String(this.href.hash());
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}
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@Override
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public boolean equals(final Object obj) {
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if (this == obj) return true;
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if (obj == null) return false;
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if (!(obj instanceof MediaSnippet)) return false;
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final MediaSnippet other = (MediaSnippet) obj;
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return Base64Order.enhancedCoder.equal(this.href.hash(), other.href.hash());
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}
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@Override
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public int compareTo(final MediaSnippet o) {
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return Base64Order.enhancedCoder.compare(this.href.hash(), o.href.hash());
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}
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@Override
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public int compare(final MediaSnippet o1, final MediaSnippet o2) {
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return o1.compareTo(o2);
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}
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public static List<MediaSnippet> retrieveMediaSnippets(final DigestURI url, final HandleSet queryhashes, final Classification.ContentDomain mediatype, final CacheStrategy cacheStrategy, final boolean reindexing) {
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if (queryhashes.isEmpty()) {
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ConcurrentLog.fine("snippet fetch", "no query hashes given for url " + url);
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return new ArrayList<MediaSnippet>();
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}
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Document document;
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try {
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document = Document.mergeDocuments(url, null, Switchboard.getSwitchboard().loader.loadDocuments(Switchboard.getSwitchboard().loader.request(url, false, reindexing), cacheStrategy, Integer.MAX_VALUE, BlacklistType.SEARCH, ClientIdentification.yacyIntranetCrawlerAgent));
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} catch (final IOException e) {
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ConcurrentLog.fine("snippet fetch", "load error: " + e.getMessage());
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return new ArrayList<MediaSnippet>();
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} catch (final Parser.Failure e) {
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ConcurrentLog.fine("snippet fetch", "parser error: " + e.getMessage());
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return new ArrayList<MediaSnippet>();
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}
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final ArrayList<MediaSnippet> a = new ArrayList<MediaSnippet>();
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if (document != null) {
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if ((mediatype == ContentDomain.ALL) || (mediatype == ContentDomain.AUDIO)) a.addAll(computeMediaSnippets(url, document, queryhashes, ContentDomain.AUDIO));
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if ((mediatype == ContentDomain.ALL) || (mediatype == ContentDomain.VIDEO)) a.addAll(computeMediaSnippets(url, document, queryhashes, ContentDomain.VIDEO));
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if ((mediatype == ContentDomain.ALL) || (mediatype == ContentDomain.APP)) a.addAll(computeMediaSnippets(url, document, queryhashes, ContentDomain.APP));
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if ((mediatype == ContentDomain.ALL) || (mediatype == ContentDomain.IMAGE)) a.addAll(computeImageSnippets(url, document, queryhashes));
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}
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return a;
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}
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public static List<MediaSnippet> computeMediaSnippets(final DigestURI source, final Document document, final HandleSet queryhashes, final ContentDomain mediatype) {
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if (document == null) return new ArrayList<MediaSnippet>();
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Map<DigestURI, String> media = null;
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if (mediatype == ContentDomain.AUDIO) media = document.getAudiolinks();
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else if (mediatype == ContentDomain.VIDEO) media = document.getVideolinks();
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else if (mediatype == ContentDomain.APP) media = document.getApplinks();
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if (media == null) return null;
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final Iterator<Map.Entry<DigestURI, String>> i = media.entrySet().iterator();
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Map.Entry<DigestURI, String> entry;
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DigestURI url;
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String desc;
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final List<MediaSnippet> result = new ArrayList<MediaSnippet>();
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while (i.hasNext()) {
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entry = i.next();
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url = entry.getKey();
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desc = entry.getValue();
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if (isUrlBlacklisted(BlacklistType.SEARCH, url)) continue;
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final int ranking = removeAppearanceHashes(url.toNormalform(true), queryhashes).size() +
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removeAppearanceHashes(desc, queryhashes).size();
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if (ranking < 2 * queryhashes.size()) {
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result.add(new MediaSnippet(mediatype, url, Classification.url2mime(url), desc, document.getTextLength(), null, ranking, source));
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}
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}
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return result;
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}
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public static List<MediaSnippet> computeImageSnippets(final DigestURI source, final Document document, final HandleSet queryhashes) {
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final SortedSet<ImageEntry> images = new TreeSet<ImageEntry>();
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images.addAll(document.getImages().values()); // iterates images in descending size order!
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// a measurement for the size of the images can be retrieved using the htmlFilterImageEntry.hashCode()
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final Iterator<ImageEntry> i = images.iterator();
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ImageEntry ientry;
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DigestURI url;
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String desc;
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final List<MediaSnippet> result = new ArrayList<MediaSnippet>();
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while (i.hasNext()) {
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ientry = i.next();
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url = ientry.url();
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final String u = url.toString();
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if (isUrlBlacklisted(BlacklistType.SEARCH, url)) continue;
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if (u.indexOf(".ico",0) >= 0 || u.indexOf("favicon",0) >= 0) continue;
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if (ientry.height() > 0 && ientry.height() < 32) continue;
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if (ientry.width() > 0 && ientry.width() < 32) continue;
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desc = ientry.alt();
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final int appcount = queryhashes.size() * 2 -
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removeAppearanceHashes(url.toNormalform(true), queryhashes).size() -
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removeAppearanceHashes(desc, queryhashes).size();
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final long ranking = Long.MAX_VALUE - (ientry.height() + 1) * (ientry.width() + 1) * (appcount + 1);
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result.add(new MediaSnippet(ContentDomain.IMAGE, url, Classification.url2mime(url), desc, ientry.fileSize(), ientry.width(), ientry.height(), ranking, source));
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}
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return result;
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}
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/**
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* removed all word hashes that can be computed as tokens from a given sentence from a given hash set
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* @param sentence
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* @param queryhashes
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* @return the given hash set minus the hashes from the tokenization of the given sentence
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*/
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private static HandleSet removeAppearanceHashes(final String sentence, final HandleSet queryhashes) {
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// remove all hashes that appear in the sentence
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if (sentence == null) return queryhashes;
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final SortedMap<byte[], Integer> hs = WordTokenizer.hashSentence(sentence, null, 100);
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final Iterator<byte[]> j = queryhashes.iterator();
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byte[] hash;
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Integer pos;
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final HandleSet remaininghashes = new RowHandleSet(queryhashes.keylen(), queryhashes.comparator(), queryhashes.size());
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while (j.hasNext()) {
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hash = j.next();
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pos = hs.get(hash);
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if (pos == null) {
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try {
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remaininghashes.put(hash);
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} catch (final SpaceExceededException e) {
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ConcurrentLog.logException(e);
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}
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}
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}
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return remaininghashes;
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}
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/**
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* Checks wether given URL is in blacklist for given blacklist type
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*
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* @param url The URL to check
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* @param blacklistType Type of blacklist (see class Blacklist, BLACKLIST_FOO)
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* @return isBlacklisted Wether the given URL is blacklisted
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*/
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private static boolean isUrlBlacklisted (final BlacklistType blacklistType, final DigestURI url) {
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// Default is not blacklisted
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boolean isBlacklisted = false;
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// check if url is in blacklist
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if (Switchboard.urlBlacklist.isListed(blacklistType, url.getHost().toLowerCase(), url.getFile())) {
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Switchboard.getSwitchboard().crawlQueues.errorURL.push(new Request(url, null), null, ASCII.getBytes(Switchboard.getSwitchboard().peers.mySeed().hash), new Date(), 1, FailCategory.FINAL_LOAD_CONTEXT, "url in blacklist", -1);
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ConcurrentLog.fine("snippet fetch", "MEDIA-SNIPPET Rejecting URL '" + url.toString() + "'. URL is in blacklist.");
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isBlacklisted = true;
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}
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// Return result
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return isBlacklisted;
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}
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}
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