git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@6268 6c8d7289-2bf4-0310-a012-ef5d649a1542pull/1/head
orbiter
16 years ago
parent
0e471ba33b
commit
72e5407115
@ -0,0 +1,167 @@
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// 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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// last major change: 10.09.2009
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//
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// contributions by Marc Nause [MN]
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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.search;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.TreeSet;
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import de.anomic.crawler.retrieval.LoaderDispatcher;
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import de.anomic.document.Document;
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import de.anomic.document.parser.html.ImageEntry;
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import de.anomic.yacy.yacyURL;
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import de.anomic.yacy.logging.Log;
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public class MediaSnippet {
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public int type;
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public yacyURL href, source;
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public String name, attr;
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public int ranking;
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public MediaSnippet(final int type, final yacyURL href, final String name, final String attr, final int ranking, final yacyURL source) {
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this.type = type;
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this.href = href;
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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.ranking = ranking; // the smaller the better! small values should be shown first
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if ((this.name == null) || (this.name.length() == 0)) this.name = "_";
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if ((this.attr == null) || (this.attr.length() == 0)) this.attr = "_";
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}
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public int hashCode() {
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return href.hashCode();
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}
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public static ArrayList<MediaSnippet> retrieveMediaSnippets(final yacyURL url, final TreeSet<byte[]> queryhashes, final int mediatype, final boolean fetchOnline, final int timeout, final boolean reindexing) {
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if (queryhashes.size() == 0) {
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Log.logFine("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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final Document document = LoaderDispatcher.retrieveDocument(url, fetchOnline, timeout, false, reindexing);
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final ArrayList<MediaSnippet> a = new ArrayList<MediaSnippet>();
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if (document != null) {
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if ((mediatype == QueryParams.CONTENTDOM_ALL) || (mediatype == QueryParams.CONTENTDOM_AUDIO)) a.addAll(computeMediaSnippets(document, queryhashes, QueryParams.CONTENTDOM_AUDIO));
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if ((mediatype == QueryParams.CONTENTDOM_ALL) || (mediatype == QueryParams.CONTENTDOM_VIDEO)) a.addAll(computeMediaSnippets(document, queryhashes, QueryParams.CONTENTDOM_VIDEO));
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if ((mediatype == QueryParams.CONTENTDOM_ALL) || (mediatype == QueryParams.CONTENTDOM_APP)) a.addAll(computeMediaSnippets(document, queryhashes, QueryParams.CONTENTDOM_APP));
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if ((mediatype == QueryParams.CONTENTDOM_ALL) || (mediatype == QueryParams.CONTENTDOM_IMAGE)) a.addAll(computeImageSnippets(document, queryhashes));
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}
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return a;
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}
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public static ArrayList<MediaSnippet> computeMediaSnippets(final Document document, final TreeSet<byte[]> queryhashes, final int mediatype) {
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if (document == null) return new ArrayList<MediaSnippet>();
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Map<yacyURL, String> media = null;
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if (mediatype == QueryParams.CONTENTDOM_AUDIO) media = document.getAudiolinks();
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else if (mediatype == QueryParams.CONTENTDOM_VIDEO) media = document.getVideolinks();
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else if (mediatype == QueryParams.CONTENTDOM_APP) media = document.getApplinks();
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if (media == null) return null;
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final Iterator<Map.Entry<yacyURL, String>> i = media.entrySet().iterator();
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Map.Entry<yacyURL, String> entry;
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yacyURL url;
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String desc;
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TreeSet<byte[]> s;
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final ArrayList<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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s = TextSnippet.removeAppearanceHashes(url.toNormalform(false, false), queryhashes);
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if (s.size() == 0) {
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result.add(new MediaSnippet(mediatype, url, desc, null, 0, document.dc_source()));
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continue;
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}
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s = TextSnippet.removeAppearanceHashes(desc, s);
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if (s.size() == 0) {
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result.add(new MediaSnippet(mediatype, url, desc, null, 0, document.dc_source()));
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continue;
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}
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}
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return result;
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}
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public static ArrayList<MediaSnippet> computeImageSnippets(final Document document, final TreeSet<byte[]> queryhashes) {
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final TreeSet<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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yacyURL url;
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String desc;
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TreeSet<byte[]> s;
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final ArrayList<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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desc = ientry.alt();
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s = TextSnippet.removeAppearanceHashes(url.toNormalform(false, false), queryhashes);
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if (s.size() == 0) {
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final int ranking = ientry.hashCode();
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result.add(new MediaSnippet(QueryParams.CONTENTDOM_IMAGE, url, desc, ientry.width() + " x " + ientry.height(), ranking, document.dc_source()));
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continue;
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}
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s = TextSnippet.removeAppearanceHashes(desc, s);
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if (s.size() == 0) {
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final int ranking = ientry.hashCode();
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result.add(new MediaSnippet(QueryParams.CONTENTDOM_IMAGE, url, desc, ientry.width() + " x " + ientry.height(), ranking, document.dc_source()));
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continue;
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}
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}
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return result;
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}
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/*
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private static String computeMediaSnippet(Map<yacyURL, String> media, Set<String> queryhashes) {
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Iterator<Map.Entry<yacyURL, String>> i = media.entrySet().iterator();
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Map.Entry<yacyURL, String> entry;
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yacyURL url;
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String desc;
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Set<String> s;
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String result = "";
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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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s = removeAppearanceHashes(url.toNormalform(false, false), queryhashes);
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if (s.size() == 0) {
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result += "<br /><a href=\"" + url + "\">" + ((desc.length() == 0) ? url : desc) + "</a>";
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continue;
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}
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s = removeAppearanceHashes(desc, s);
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if (s.size() == 0) {
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result += "<br /><a href=\"" + url + "\">" + ((desc.length() == 0) ? url : desc) + "</a>";
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continue;
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}
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}
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if (result.length() == 0) return null;
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return result.substring(6);
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}
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*/
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}
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@ -1,933 +0,0 @@
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// plasmaSnippetCache.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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// last major change: 09.10.2006
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//
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// contributions by Marc Nause [MN]
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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.search;
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import java.io.ByteArrayInputStream;
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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.Enumeration;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.Set;
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import java.util.TreeMap;
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import java.util.TreeSet;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import de.anomic.crawler.retrieval.Response;
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import de.anomic.document.Condenser;
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import de.anomic.document.Parser;
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import de.anomic.document.ParserException;
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import de.anomic.document.Word;
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import de.anomic.document.Document;
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import de.anomic.document.parser.html.CharacterCoding;
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import de.anomic.document.parser.html.ImageEntry;
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import de.anomic.http.client.Client;
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import de.anomic.http.client.Cache;
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import de.anomic.http.metadata.ResponseHeader;
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import de.anomic.kelondro.index.SimpleARC;
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import de.anomic.kelondro.order.Base64Order;
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import de.anomic.kelondro.text.metadataPrototype.URLMetadataRow;
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import de.anomic.kelondro.util.SetTools;
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import de.anomic.yacy.yacySearch;
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import de.anomic.yacy.yacyURL;
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import de.anomic.yacy.logging.Log;
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public class SnippetCache {
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private static final int maxCache = 500;
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public static final int SOURCE_CACHE = 0;
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public static final int SOURCE_FILE = 1;
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public static final int SOURCE_WEB = 2;
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public static final int SOURCE_METADATA = 3;
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public static final int ERROR_NO_HASH_GIVEN = 11;
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public static final int ERROR_SOURCE_LOADING = 12;
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public static final int ERROR_RESOURCE_LOADING = 13;
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public static final int ERROR_PARSER_FAILED = 14;
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public static final int ERROR_PARSER_NO_LINES = 15;
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public static final int ERROR_NO_MATCH = 16;
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private static final SimpleARC<String, String> snippetsCache = new SimpleARC<String, String>(maxCache);
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/**
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* a cache holding URLs to favicons specified by the page content, e.g. by using the html link-tag. e.g.
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* <pre>
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* <link rel="shortcut icon" type="image/x-icon" href="../src/favicon.ico">
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* </pre>
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*/
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private static final HashMap<String, yacyURL> faviconCache = new HashMap<String, yacyURL>();
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private static Log log = null;
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private static Switchboard sb = null;
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public static void init(
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final Log logx,
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final Switchboard switchboard
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) {
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log = logx;
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sb = switchboard;
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snippetsCache.clear();
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faviconCache.clear();
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}
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public static class TextSnippet {
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private final yacyURL url;
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private String line;
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private final String error;
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private final int errorCode;
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TreeSet<byte[]> remaingHashes;
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private final yacyURL favicon;
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/**
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* <code>\\A[^\\p{L}\\p{N}].+</code>
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*/
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private final static Pattern p1 = Pattern.compile("\\A[^\\p{L}\\p{N}].+");
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/**
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* <code>.+[^\\p{L}\\p{N}]\\Z</code>
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*/
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private final static Pattern p2 = Pattern.compile(".+[^\\p{L}\\p{N}]\\Z");
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/**
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* <code>\\A[\\p{L}\\p{N}]+[^\\p{L}\\p{N}].+\\Z</code>
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*/
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private final static Pattern p3 = Pattern.compile("\\A[\\p{L}\\p{N}]+[^\\p{L}\\p{N}].+\\Z");
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/**
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* <code>[^\\p{L}\\p{N}]</code>
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*/
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private final static Pattern p4 = Pattern.compile("[^\\p{L}\\p{N}]");
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/**
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* <code>(.*?)(\\<b\\>.+?\\</b\\>)(.*)</code>
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*/
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private final static Pattern p01 = Pattern.compile("(.*?)(\\<b\\>.+?\\</b\\>)(.*)"); // marked words are in <b>-tags
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public TextSnippet(final yacyURL url, final String line, final int errorCode, final TreeSet<byte[]> remaingHashes, final String errortext) {
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this(url,line,errorCode,remaingHashes,errortext,null);
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}
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public TextSnippet(final yacyURL url, final String line, final int errorCode, final TreeSet<byte[]> remaingHashes, final String errortext, final yacyURL favicon) {
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this.url = url;
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this.line = line;
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this.errorCode = errorCode;
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this.error = errortext;
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this.remaingHashes = remaingHashes;
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this.favicon = favicon;
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}
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public yacyURL getUrl() {
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return this.url;
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}
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public yacyURL getFavicon() {
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return this.favicon;
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}
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public boolean exists() {
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return line != null;
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}
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public String toString() {
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return (line == null) ? "" : line;
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}
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public String getLineRaw() {
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return (line == null) ? "" : line;
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}
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public String getError() {
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return (error == null) ? "" : error.trim();
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}
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public int getErrorCode() {
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return errorCode;
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}
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public TreeSet<byte[]> getRemainingHashes() {
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return this.remaingHashes;
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}
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public String getLineMarked(final TreeSet<byte[]> queryHashes) {
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if (line == null) return "";
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if ((queryHashes == null) || (queryHashes.size() == 0)) return line.trim();
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if (line.endsWith(".")) line = line.substring(0, line.length() - 1);
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final Iterator<byte[]> i = queryHashes.iterator();
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byte[] h;
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final String[] w = line.split(" ");
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while (i.hasNext()) {
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h = i.next();
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for (int j = 0; j < w.length; j++) {
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final ArrayList<String> al = markedWordArrayList(w[j]); // mark special character separated words correctly if more than 1 word has to be marked
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w[j] = "";
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for (int k = 0; k < al.size(); k++) {
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if(k % 2 == 0){ // word has not been marked
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w[j] += getWordMarked(al.get(k), h);
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} else { // word has been marked, do not encode again
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w[j] += al.get(k);
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}
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}
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}
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}
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final StringBuilder l = new StringBuilder(line.length() + queryHashes.size() * 8);
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for (int j = 0; j < w.length; j++) {
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l.append(w[j]);
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l.append(' ');
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}
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return l.toString().trim();
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}
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/**
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* mark words with <b>-tags
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* @param word the word to mark
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* @param h the hash of the word to mark
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* @return the marked word if hash matches, else the unmarked word
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* @see #getLineMarked(Set)
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*/
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private static String getWordMarked(String word, byte[] h){
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//ignore punctuation marks (contrib [MN])
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//note to myself:
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//For details on regex see "Mastering regular expressions" by J.E.F. Friedl
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//especially p. 123 and p. 390/391 (in the German version of the 2nd edition)
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String prefix = "";
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String postfix = "";
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int len = 0;
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// cut off prefix if it contains of non-characters or non-numbers
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while(p1.matcher(word).find()) {
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prefix = prefix + word.substring(0,1);
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word = word.substring(1);
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}
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// cut off postfix if it contains of non-characters or non-numbers
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while(p2.matcher(word).find()) {
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len = word.length();
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postfix = word.substring(len-1,len) + postfix;
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word = word.substring(0,len-1);
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}
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//special treatment if there is a special character in the word
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if(p3.matcher(word).find()) {
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String out = "";
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String temp = "";
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for(int k=0; k < word.length(); k++) {
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//is character a special character?
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if(p4.matcher(word.substring(k,k+1)).find()) {
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if (new String(Word.word2hash(temp)).equals(new String(h))) temp = "<b>" + CharacterCoding.unicode2html(temp, false) + "</b>";
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out = out + temp + CharacterCoding.unicode2html(word.substring(k,k+1), false);
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temp = "";
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}
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//last character
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else if(k == (word.length()-1)) {
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temp = temp + word.substring(k,k+1);
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if (new String(Word.word2hash(temp)).equals(new String(h))) temp = "<b>" + CharacterCoding.unicode2html(temp, false) + "</b>";
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out = out + temp;
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temp = "";
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}
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else temp = temp + word.substring(k,k+1);
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}
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word = out;
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}
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//end contrib [MN]
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else if (new String(Word.word2hash(word)).equals(new String(h))) word = "<b>" + CharacterCoding.unicode2html(word, false) + "</b>";
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word = CharacterCoding.unicode2html(prefix, false)
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+ word
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+ CharacterCoding.unicode2html(postfix, false);
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return word;
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}
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/**
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* words that already has been marked has index <code>(i % 2 == 1)</code>
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* words that has not yet been marked has index <code>(i % 2 == 0)</code>
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* @param string the String to be processed
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||||
* @return words that already has and has not yet been marked
|
||||
* @author [DW], 08.11.2008
|
||||
*/
|
||||
private static ArrayList<String> markedWordArrayList(String string){
|
||||
ArrayList<String> al = new java.util.ArrayList<String>(1);
|
||||
Matcher m = p01.matcher(string);
|
||||
while (m.find()) {
|
||||
al.add(m.group(1));
|
||||
al.add(m.group(2));
|
||||
string = m.group(3); // the postfix
|
||||
m = p01.matcher(string);
|
||||
}
|
||||
al.add(string);
|
||||
return al;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
public static class MediaSnippet {
|
||||
public int type;
|
||||
public yacyURL href, source;
|
||||
public String name, attr;
|
||||
public int ranking;
|
||||
public MediaSnippet(final int type, final yacyURL href, final String name, final String attr, final int ranking, final yacyURL source) {
|
||||
this.type = type;
|
||||
this.href = href;
|
||||
this.source = source; // the web page where the media resource appeared
|
||||
this.name = name;
|
||||
this.attr = attr;
|
||||
this.ranking = ranking; // the smaller the better! small values should be shown first
|
||||
if ((this.name == null) || (this.name.length() == 0)) this.name = "_";
|
||||
if ((this.attr == null) || (this.attr.length() == 0)) this.attr = "_";
|
||||
}
|
||||
public int hashCode() {
|
||||
return href.hashCode();
|
||||
}
|
||||
}
|
||||
|
||||
public static boolean existsInCache(final yacyURL url, final TreeSet<byte[]> queryhashes) {
|
||||
final String hashes = yacySearch.set2string(queryhashes);
|
||||
return retrieveFromCache(hashes, url.hash()) != null;
|
||||
}
|
||||
|
||||
@SuppressWarnings("unchecked")
|
||||
public static TextSnippet retrieveTextSnippet(final URLMetadataRow.Components comp, final TreeSet<byte[]> queryhashes, final boolean fetchOnline, final boolean pre, final int snippetMaxLength, final int maxDocLen, final boolean reindexing) {
|
||||
// heise = "0OQUNU3JSs05"
|
||||
final yacyURL url = comp.url();
|
||||
if (queryhashes.size() == 0) {
|
||||
//System.out.println("found no queryhashes for URL retrieve " + url);
|
||||
return new TextSnippet(url, null, ERROR_NO_HASH_GIVEN, queryhashes, "no query hashes given");
|
||||
}
|
||||
|
||||
// try to get snippet from snippetCache
|
||||
int source = SOURCE_CACHE;
|
||||
final String wordhashes = yacySearch.set2string(queryhashes);
|
||||
String line = retrieveFromCache(wordhashes, url.hash());
|
||||
if (line != null) {
|
||||
// found the snippet
|
||||
return new TextSnippet(url, line, source, null, null, faviconCache.get(url.hash()));
|
||||
}
|
||||
|
||||
/* ===========================================================================
|
||||
* LOADING RESOURCE DATA
|
||||
* =========================================================================== */
|
||||
// if the snippet is not in the cache, we can try to get it from the htcache
|
||||
long resContentLength = 0;
|
||||
InputStream resContent = null;
|
||||
ResponseHeader responseHeader = null;
|
||||
try {
|
||||
// first try to get the snippet from metadata
|
||||
String loc;
|
||||
if (containsAllHashes(loc = comp.dc_title(), queryhashes)) {
|
||||
// try to create the snippet from information given in the url itself
|
||||
return new TextSnippet(url, loc, SOURCE_METADATA, null, null, faviconCache.get(url.hash()));
|
||||
} else if (containsAllHashes(loc = comp.dc_creator(), queryhashes)) {
|
||||
// try to create the snippet from information given in the creator metadata
|
||||
return new TextSnippet(url, loc, SOURCE_METADATA, null, null, faviconCache.get(url.hash()));
|
||||
} else if (containsAllHashes(loc = comp.dc_subject(), queryhashes)) {
|
||||
// try to create the snippet from information given in the subject metadata
|
||||
return new TextSnippet(url, loc, SOURCE_METADATA, null, null, faviconCache.get(url.hash()));
|
||||
} else if (containsAllHashes(loc = comp.url().toNormalform(true, true).replace('-', ' '), queryhashes)) {
|
||||
// try to create the snippet from information given in the subject metadata
|
||||
return new TextSnippet(url, loc, SOURCE_METADATA, null, null, faviconCache.get(url.hash()));
|
||||
} else {
|
||||
// trying to load the resource from the cache
|
||||
resContent = Cache.getContentStream(url);
|
||||
responseHeader = Cache.getResponseHeader(url);
|
||||
if (resContent != null && ((resContentLength = Cache.getResourceContentLength(url)) > maxDocLen) && (!fetchOnline)) {
|
||||
// content may be too large to be parsed here. To be fast, we omit calculation of snippet here
|
||||
return new TextSnippet(url, null, ERROR_SOURCE_LOADING, queryhashes, "resource available, but too large: " + resContentLength + " bytes");
|
||||
} else if (fetchOnline) {
|
||||
// if not found try to download it
|
||||
|
||||
// download resource using the crawler and keep resource in memory if possible
|
||||
final Response entry = Switchboard.getSwitchboard().loader.load(url, true, reindexing);
|
||||
|
||||
// getting resource metadata (e.g. the http headers for http resources)
|
||||
if (entry != null) {
|
||||
// place entry on indexing queue
|
||||
sb.toIndexer(entry);
|
||||
|
||||
// read resource body (if it is there)
|
||||
final byte []resourceArray = entry.getContent();
|
||||
if (resourceArray != null) {
|
||||
resContent = new ByteArrayInputStream(resourceArray);
|
||||
resContentLength = resourceArray.length;
|
||||
} else {
|
||||
resContent = Cache.getContentStream(url);
|
||||
resContentLength = Cache.getResourceContentLength(url);
|
||||
}
|
||||
}
|
||||
|
||||
// if it is still not available, report an error
|
||||
if (resContent == null) return new TextSnippet(url, null, ERROR_RESOURCE_LOADING, queryhashes, "error loading resource, plasmaHTCache.Entry cache is NULL");
|
||||
|
||||
source = SOURCE_WEB;
|
||||
} else {
|
||||
return new TextSnippet(url, null, ERROR_SOURCE_LOADING, queryhashes, "no resource available");
|
||||
}
|
||||
}
|
||||
} catch (final Exception e) {
|
||||
//e.printStackTrace();
|
||||
return new TextSnippet(url, null, ERROR_SOURCE_LOADING, queryhashes, "error loading resource: " + e.getMessage());
|
||||
}
|
||||
|
||||
/* ===========================================================================
|
||||
* PARSING RESOURCE
|
||||
* =========================================================================== */
|
||||
Document document = null;
|
||||
try {
|
||||
document = parseDocument(url, resContentLength, resContent, responseHeader);
|
||||
} catch (final ParserException e) {
|
||||
return new TextSnippet(url, null, ERROR_PARSER_FAILED, queryhashes, e.getMessage()); // cannot be parsed
|
||||
} finally {
|
||||
try { resContent.close(); } catch (final Exception e) {/* ignore this */}
|
||||
}
|
||||
if (document == null) return new TextSnippet(url, null, ERROR_PARSER_FAILED, queryhashes, "parser error/failed"); // cannot be parsed
|
||||
|
||||
|
||||
/* ===========================================================================
|
||||
* COMPUTE SNIPPET
|
||||
* =========================================================================== */
|
||||
final yacyURL resFavicon = document.getFavicon();
|
||||
if (resFavicon != null) faviconCache.put(url.hash(), resFavicon);
|
||||
// we have found a parseable non-empty file: use the lines
|
||||
|
||||
// compute snippet from text
|
||||
final Iterator<StringBuilder> sentences = document.getSentences(pre);
|
||||
if (sentences == null) return new TextSnippet(url, null, ERROR_PARSER_NO_LINES, queryhashes, "parser returned no sentences",resFavicon);
|
||||
final Object[] tsr = computeTextSnippet(sentences, queryhashes, snippetMaxLength);
|
||||
final String textline = (tsr == null) ? null : (String) tsr[0];
|
||||
final TreeSet<byte[]> remainingHashes = (tsr == null) ? queryhashes : (TreeSet<byte[]>) tsr[1];
|
||||
|
||||
// compute snippet from media
|
||||
//String audioline = computeMediaSnippet(document.getAudiolinks(), queryhashes);
|
||||
//String videoline = computeMediaSnippet(document.getVideolinks(), queryhashes);
|
||||
//String appline = computeMediaSnippet(document.getApplinks(), queryhashes);
|
||||
//String hrefline = computeMediaSnippet(document.getAnchors(), queryhashes);
|
||||
//String imageline = computeMediaSnippet(document.getAudiolinks(), queryhashes);
|
||||
|
||||
line = "";
|
||||
//if (audioline != null) line += (line.length() == 0) ? audioline : "<br />" + audioline;
|
||||
//if (videoline != null) line += (line.length() == 0) ? videoline : "<br />" + videoline;
|
||||
//if (appline != null) line += (line.length() == 0) ? appline : "<br />" + appline;
|
||||
//if (hrefline != null) line += (line.length() == 0) ? hrefline : "<br />" + hrefline;
|
||||
if (textline != null) line += (line.length() == 0) ? textline : "<br />" + textline;
|
||||
|
||||
if ((line == null) || (remainingHashes.size() > 0)) return new TextSnippet(url, null, ERROR_NO_MATCH, remainingHashes, "no matching snippet found",resFavicon);
|
||||
if (line.length() > snippetMaxLength) line = line.substring(0, snippetMaxLength);
|
||||
|
||||
// finally store this snippet in our own cache
|
||||
storeToCache(wordhashes, url.hash(), line);
|
||||
|
||||
document.close();
|
||||
return new TextSnippet(url, line, source, null, null, resFavicon);
|
||||
}
|
||||
|
||||
/**
|
||||
* Tries to load and parse a resource specified by it's URL.
|
||||
* If the resource is not stored in cache and if fetchOnline is set the
|
||||
* this function tries to download the resource from web.
|
||||
*
|
||||
* @param url the URL of the resource
|
||||
* @param fetchOnline specifies if the resource should be loaded from web if it'as not available in the cache
|
||||
* @param timeout
|
||||
* @param forText
|
||||
* @param global the domain of the search. If global == true then the content is re-indexed
|
||||
* @return the parsed document as {@link Document}
|
||||
*/
|
||||
public static Document retrieveDocument(final yacyURL url, final boolean fetchOnline, final int timeout, final boolean forText, final boolean global) {
|
||||
|
||||
// load resource
|
||||
long resContentLength = 0;
|
||||
InputStream resContent = null;
|
||||
ResponseHeader responseHeader = null;
|
||||
try {
|
||||
// trying to load the resource from the cache
|
||||
resContent = Cache.getContentStream(url);
|
||||
responseHeader = Cache.getResponseHeader(url);
|
||||
if (resContent != null) {
|
||||
// if the content was found
|
||||
resContentLength = Cache.getResourceContentLength(url);
|
||||
} else if (fetchOnline) {
|
||||
// if not found try to download it
|
||||
|
||||
// download resource using the crawler and keep resource in memory if possible
|
||||
final Response entry = Switchboard.getSwitchboard().loader.load(url, forText, global);
|
||||
|
||||
// getting resource metadata (e.g. the http headers for http resources)
|
||||
if (entry != null) {
|
||||
|
||||
// read resource body (if it is there)
|
||||
final byte[] resourceArray = entry.getContent();
|
||||
if (resourceArray != null) {
|
||||
resContent = new ByteArrayInputStream(resourceArray);
|
||||
resContentLength = resourceArray.length;
|
||||
} else {
|
||||
resContent = Cache.getContentStream(url);
|
||||
resContentLength = Cache.getResourceContentLength(url);
|
||||
}
|
||||
}
|
||||
|
||||
// if it is still not available, report an error
|
||||
if (resContent == null) {
|
||||
Log.logFine("snippet fetch", "plasmaHTCache.Entry cache is NULL for url " + url);
|
||||
return null;
|
||||
}
|
||||
} else {
|
||||
Log.logFine("snippet fetch", "no resource available for url " + url);
|
||||
return null;
|
||||
}
|
||||
} catch (final Exception e) {
|
||||
Log.logFine("snippet fetch", "error loading resource: " + e.getMessage() + " for url " + url);
|
||||
return null;
|
||||
}
|
||||
|
||||
// parse resource
|
||||
Document document = null;
|
||||
try {
|
||||
document = parseDocument(url, resContentLength, resContent, responseHeader);
|
||||
} catch (final ParserException e) {
|
||||
Log.logFine("snippet fetch", "parser error " + e.getMessage() + " for url " + url);
|
||||
return null;
|
||||
} finally {
|
||||
try { resContent.close(); } catch (final Exception e) {}
|
||||
}
|
||||
return document;
|
||||
}
|
||||
|
||||
public static void storeToCache(final String wordhashes, final String urlhash, final String snippet) {
|
||||
// generate key
|
||||
String key = urlhash + wordhashes;
|
||||
|
||||
// do nothing if snippet is known
|
||||
if (snippetsCache.containsKey(key)) return;
|
||||
|
||||
// learn new snippet
|
||||
snippetsCache.put(key, snippet);
|
||||
}
|
||||
|
||||
private static String retrieveFromCache(final String wordhashes, final String urlhash) {
|
||||
// generate key
|
||||
final String key = urlhash + wordhashes;
|
||||
return snippetsCache.get(key);
|
||||
}
|
||||
|
||||
/*
|
||||
private static String computeMediaSnippet(Map<yacyURL, String> media, Set<String> queryhashes) {
|
||||
Iterator<Map.Entry<yacyURL, String>> i = media.entrySet().iterator();
|
||||
Map.Entry<yacyURL, String> entry;
|
||||
yacyURL url;
|
||||
String desc;
|
||||
Set<String> s;
|
||||
String result = "";
|
||||
while (i.hasNext()) {
|
||||
entry = i.next();
|
||||
url = entry.getKey();
|
||||
desc = entry.getValue();
|
||||
s = removeAppearanceHashes(url.toNormalform(false, false), queryhashes);
|
||||
if (s.size() == 0) {
|
||||
result += "<br /><a href=\"" + url + "\">" + ((desc.length() == 0) ? url : desc) + "</a>";
|
||||
continue;
|
||||
}
|
||||
s = removeAppearanceHashes(desc, s);
|
||||
if (s.size() == 0) {
|
||||
result += "<br /><a href=\"" + url + "\">" + ((desc.length() == 0) ? url : desc) + "</a>";
|
||||
continue;
|
||||
}
|
||||
}
|
||||
if (result.length() == 0) return null;
|
||||
return result.substring(6);
|
||||
}
|
||||
*/
|
||||
|
||||
@SuppressWarnings("unchecked")
|
||||
private static Object[] /*{String - the snippet, Set - remaining hashes}*/
|
||||
computeTextSnippet(final Iterator<StringBuilder> sentences, final TreeSet<byte[]> queryhashes, int maxLength) {
|
||||
try {
|
||||
if (sentences == null) return null;
|
||||
if ((queryhashes == null) || (queryhashes.size() == 0)) return null;
|
||||
Iterator<byte[]> j;
|
||||
TreeMap<byte[], Integer> hs;
|
||||
StringBuilder sentence;
|
||||
final TreeMap<Integer, StringBuilder> os = new TreeMap<Integer, StringBuilder>();
|
||||
int uniqCounter = 9999;
|
||||
int score;
|
||||
while (sentences.hasNext()) {
|
||||
sentence = sentences.next();
|
||||
hs = hashSentence(sentence.toString());
|
||||
j = queryhashes.iterator();
|
||||
score = 0;
|
||||
while (j.hasNext()) {if (hs.containsKey(j.next())) score++;}
|
||||
if (score > 0) {
|
||||
os.put(Integer.valueOf(1000000 * score - sentence.length() * 10000 + uniqCounter--), sentence);
|
||||
}
|
||||
}
|
||||
|
||||
String result;
|
||||
TreeSet<byte[]> remaininghashes;
|
||||
while (os.size() > 0) {
|
||||
sentence = os.remove(os.lastKey()); // sentence with the biggest score
|
||||
Object[] tsr = computeTextSnippet(sentence.toString(), queryhashes, maxLength);
|
||||
if (tsr == null) continue;
|
||||
result = (String) tsr[0];
|
||||
if ((result != null) && (result.length() > 0)) {
|
||||
remaininghashes = (TreeSet<byte[]>) tsr[1];
|
||||
if (remaininghashes.size() == 0) {
|
||||
// we have found the snippet
|
||||
return new Object[]{result, remaininghashes};
|
||||
} else if (remaininghashes.size() < queryhashes.size()) {
|
||||
// the result has not all words in it.
|
||||
// find another sentence that represents the missing other words
|
||||
// and find recursively more sentences
|
||||
maxLength = maxLength - result.length();
|
||||
if (maxLength < 20) maxLength = 20;
|
||||
tsr = computeTextSnippet(os.values().iterator(), remaininghashes, maxLength);
|
||||
if (tsr == null) return null;
|
||||
final String nextSnippet = (String) tsr[0];
|
||||
if (nextSnippet == null) return tsr;
|
||||
return new Object[]{result + (" / " + nextSnippet), tsr[1]};
|
||||
} else {
|
||||
// error
|
||||
//assert remaininghashes.size() < queryhashes.size() : "remaininghashes.size() = " + remaininghashes.size() + ", queryhashes.size() = " + queryhashes.size() + ", sentence = '" + sentence + "', result = '" + result + "'";
|
||||
continue;
|
||||
}
|
||||
}
|
||||
}
|
||||
return null;
|
||||
} catch (final IndexOutOfBoundsException e) {
|
||||
log.logSevere("computeSnippet: error with string generation", e);
|
||||
return new Object[]{null, queryhashes};
|
||||
}
|
||||
}
|
||||
|
||||
private static Object[] /*{String - the snippet, Set - remaining hashes}*/
|
||||
computeTextSnippet(String sentence, final TreeSet<byte[]> queryhashes, final int maxLength) {
|
||||
try {
|
||||
if (sentence == null) return null;
|
||||
if ((queryhashes == null) || (queryhashes.size() == 0)) return null;
|
||||
byte[] hash;
|
||||
|
||||
// find all hashes that appear in the sentence
|
||||
final TreeMap<byte[], Integer> hs = hashSentence(sentence);
|
||||
final Iterator<byte[]> j = queryhashes.iterator();
|
||||
Integer pos;
|
||||
int p, minpos = sentence.length(), maxpos = -1;
|
||||
final TreeSet<byte[]> remainingHashes = new TreeSet<byte[]>(Base64Order.enhancedCoder);
|
||||
while (j.hasNext()) {
|
||||
hash = j.next();
|
||||
pos = hs.get(hash);
|
||||
if (pos == null) {
|
||||
remainingHashes.add(hash);
|
||||
} else {
|
||||
p = pos.intValue();
|
||||
if (p > maxpos) maxpos = p;
|
||||
if (p < minpos) minpos = p;
|
||||
}
|
||||
}
|
||||
// check result size
|
||||
maxpos = maxpos + 10;
|
||||
if (maxpos > sentence.length()) maxpos = sentence.length();
|
||||
if (minpos < 0) minpos = 0;
|
||||
// we have a result, but is it short enough?
|
||||
if (maxpos - minpos + 10 > maxLength) {
|
||||
// the string is too long, even if we cut at both ends
|
||||
// so cut here in the middle of the string
|
||||
final int lenb = sentence.length();
|
||||
sentence = sentence.substring(0, (minpos + 20 > sentence.length()) ? sentence.length() : minpos + 20).trim() +
|
||||
" [..] " +
|
||||
sentence.substring((maxpos + 26 > sentence.length()) ? sentence.length() : maxpos + 26).trim();
|
||||
maxpos = maxpos + lenb - sentence.length() + 6;
|
||||
}
|
||||
if (maxpos > maxLength) {
|
||||
// the string is too long, even if we cut it at the end
|
||||
// so cut it here at both ends at once
|
||||
assert maxpos >= minpos;
|
||||
final int newlen = Math.max(10, maxpos - minpos + 10);
|
||||
final int around = (maxLength - newlen) / 2;
|
||||
assert minpos - around < sentence.length() : "maxpos = " + maxpos + ", minpos = " + minpos + ", around = " + around + ", sentence.length() = " + sentence.length();
|
||||
//assert ((maxpos + around) <= sentence.length()) && ((maxpos + around) <= sentence.length()) : "maxpos = " + maxpos + ", minpos = " + minpos + ", around = " + around + ", sentence.length() = " + sentence.length();
|
||||
sentence = "[..] " + sentence.substring(minpos - around, ((maxpos + around) > sentence.length()) ? sentence.length() : (maxpos + around)).trim() + " [..]";
|
||||
minpos = around;
|
||||
maxpos = sentence.length() - around - 5;
|
||||
}
|
||||
if (sentence.length() > maxLength) {
|
||||
// trim sentence, 1st step (cut at right side)
|
||||
sentence = sentence.substring(0, maxpos).trim() + " [..]";
|
||||
}
|
||||
if (sentence.length() > maxLength) {
|
||||
// trim sentence, 2nd step (cut at left side)
|
||||
sentence = "[..] " + sentence.substring(minpos).trim();
|
||||
}
|
||||
if (sentence.length() > maxLength) {
|
||||
// trim sentence, 3rd step (cut in the middle)
|
||||
sentence = sentence.substring(6, 20).trim() + " [..] " + sentence.substring(sentence.length() - 26, sentence.length() - 6).trim();
|
||||
}
|
||||
return new Object[] {sentence, remainingHashes};
|
||||
} catch (final IndexOutOfBoundsException e) {
|
||||
log.logSevere("computeSnippet: error with string generation", e);
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
public static ArrayList<MediaSnippet> retrieveMediaSnippets(final yacyURL url, final TreeSet<byte[]> queryhashes, final int mediatype, final boolean fetchOnline, final int timeout, final boolean reindexing) {
|
||||
if (queryhashes.size() == 0) {
|
||||
Log.logFine("snippet fetch", "no query hashes given for url " + url);
|
||||
return new ArrayList<MediaSnippet>();
|
||||
}
|
||||
|
||||
final Document document = retrieveDocument(url, fetchOnline, timeout, false, reindexing);
|
||||
final ArrayList<MediaSnippet> a = new ArrayList<MediaSnippet>();
|
||||
if (document != null) {
|
||||
if ((mediatype == QueryParams.CONTENTDOM_ALL) || (mediatype == QueryParams.CONTENTDOM_AUDIO)) a.addAll(computeMediaSnippets(document, queryhashes, QueryParams.CONTENTDOM_AUDIO));
|
||||
if ((mediatype == QueryParams.CONTENTDOM_ALL) || (mediatype == QueryParams.CONTENTDOM_VIDEO)) a.addAll(computeMediaSnippets(document, queryhashes, QueryParams.CONTENTDOM_VIDEO));
|
||||
if ((mediatype == QueryParams.CONTENTDOM_ALL) || (mediatype == QueryParams.CONTENTDOM_APP)) a.addAll(computeMediaSnippets(document, queryhashes, QueryParams.CONTENTDOM_APP));
|
||||
if ((mediatype == QueryParams.CONTENTDOM_ALL) || (mediatype == QueryParams.CONTENTDOM_IMAGE)) a.addAll(computeImageSnippets(document, queryhashes));
|
||||
}
|
||||
return a;
|
||||
}
|
||||
|
||||
public static ArrayList<MediaSnippet> computeMediaSnippets(final Document document, final TreeSet<byte[]> queryhashes, final int mediatype) {
|
||||
|
||||
if (document == null) return new ArrayList<MediaSnippet>();
|
||||
Map<yacyURL, String> media = null;
|
||||
if (mediatype == QueryParams.CONTENTDOM_AUDIO) media = document.getAudiolinks();
|
||||
else if (mediatype == QueryParams.CONTENTDOM_VIDEO) media = document.getVideolinks();
|
||||
else if (mediatype == QueryParams.CONTENTDOM_APP) media = document.getApplinks();
|
||||
if (media == null) return null;
|
||||
|
||||
final Iterator<Map.Entry<yacyURL, String>> i = media.entrySet().iterator();
|
||||
Map.Entry<yacyURL, String> entry;
|
||||
yacyURL url;
|
||||
String desc;
|
||||
TreeSet<byte[]> s;
|
||||
final ArrayList<MediaSnippet> result = new ArrayList<MediaSnippet>();
|
||||
while (i.hasNext()) {
|
||||
entry = i.next();
|
||||
url = entry.getKey();
|
||||
desc = entry.getValue();
|
||||
s = removeAppearanceHashes(url.toNormalform(false, false), queryhashes);
|
||||
if (s.size() == 0) {
|
||||
result.add(new MediaSnippet(mediatype, url, desc, null, 0, document.dc_source()));
|
||||
continue;
|
||||
}
|
||||
s = removeAppearanceHashes(desc, s);
|
||||
if (s.size() == 0) {
|
||||
result.add(new MediaSnippet(mediatype, url, desc, null, 0, document.dc_source()));
|
||||
continue;
|
||||
}
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
public static ArrayList<MediaSnippet> computeImageSnippets(final Document document, final TreeSet<byte[]> queryhashes) {
|
||||
|
||||
final TreeSet<ImageEntry> images = new TreeSet<ImageEntry>();
|
||||
images.addAll(document.getImages().values()); // iterates images in descending size order!
|
||||
// a measurement for the size of the images can be retrieved using the htmlFilterImageEntry.hashCode()
|
||||
|
||||
final Iterator<ImageEntry> i = images.iterator();
|
||||
ImageEntry ientry;
|
||||
yacyURL url;
|
||||
String desc;
|
||||
TreeSet<byte[]> s;
|
||||
final ArrayList<MediaSnippet> result = new ArrayList<MediaSnippet>();
|
||||
while (i.hasNext()) {
|
||||
ientry = i.next();
|
||||
url = ientry.url();
|
||||
desc = ientry.alt();
|
||||
s = removeAppearanceHashes(url.toNormalform(false, false), queryhashes);
|
||||
if (s.size() == 0) {
|
||||
final int ranking = ientry.hashCode();
|
||||
result.add(new MediaSnippet(QueryParams.CONTENTDOM_IMAGE, url, desc, ientry.width() + " x " + ientry.height(), ranking, document.dc_source()));
|
||||
continue;
|
||||
}
|
||||
s = removeAppearanceHashes(desc, s);
|
||||
if (s.size() == 0) {
|
||||
final int ranking = ientry.hashCode();
|
||||
result.add(new MediaSnippet(QueryParams.CONTENTDOM_IMAGE, url, desc, ientry.width() + " x " + ientry.height(), ranking, document.dc_source()));
|
||||
continue;
|
||||
}
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
private static TreeSet<byte[]> removeAppearanceHashes(final String sentence, final TreeSet<byte[]> queryhashes) {
|
||||
// remove all hashes that appear in the sentence
|
||||
if (sentence == null) return queryhashes;
|
||||
final TreeMap<byte[], Integer> hs = hashSentence(sentence);
|
||||
final Iterator<byte[]> j = queryhashes.iterator();
|
||||
byte[] hash;
|
||||
Integer pos;
|
||||
final TreeSet<byte[]> remaininghashes = new TreeSet<byte[]>(Base64Order.enhancedCoder);
|
||||
while (j.hasNext()) {
|
||||
hash = j.next();
|
||||
pos = hs.get(hash);
|
||||
if (pos == null) {
|
||||
remaininghashes.add(hash);
|
||||
}
|
||||
}
|
||||
return remaininghashes;
|
||||
}
|
||||
|
||||
private static TreeMap<byte[], Integer> hashSentence(final String sentence) {
|
||||
// generates a word-wordPos mapping
|
||||
final TreeMap<byte[], Integer> map = new TreeMap<byte[], Integer>(Base64Order.enhancedCoder);
|
||||
final Enumeration<StringBuilder> words = Condenser.wordTokenizer(sentence, "UTF-8");
|
||||
int pos = 0;
|
||||
StringBuilder word;
|
||||
byte[] hash;
|
||||
while (words.hasMoreElements()) {
|
||||
word = words.nextElement();
|
||||
hash = Word.word2hash(new String(word));
|
||||
if (!map.containsKey(hash)) map.put(hash, Integer.valueOf(pos)); // don't overwrite old values, that leads to too far word distances
|
||||
pos += word.length() + 1;
|
||||
}
|
||||
return map;
|
||||
}
|
||||
|
||||
private static boolean containsAllHashes(final String sentence, final Set<byte[]> queryhashes) {
|
||||
final TreeMap<byte[], Integer> m = hashSentence(sentence);
|
||||
final Iterator<byte[]> i = queryhashes.iterator();
|
||||
while (i.hasNext()) {
|
||||
if (!(m.containsKey(i.next()))) return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
public static Document parseDocument(final yacyURL url, final long contentLength, final InputStream resourceStream) throws ParserException {
|
||||
return parseDocument(url, contentLength, resourceStream, null);
|
||||
}
|
||||
|
||||
/**
|
||||
* Parse the resource
|
||||
* @param url the URL of the resource
|
||||
* @param contentLength the contentLength of the resource
|
||||
* @param resourceStream the resource body as stream
|
||||
* @param docInfo metadata about the resource
|
||||
* @return the extracted data
|
||||
* @throws ParserException
|
||||
*/
|
||||
public static Document parseDocument(final yacyURL url, final long contentLength, final InputStream resourceStream, ResponseHeader responseHeader) throws ParserException {
|
||||
try {
|
||||
if (resourceStream == null) return null;
|
||||
|
||||
// STEP 1: if no resource metadata is available, try to load it from cache
|
||||
if (responseHeader == null) {
|
||||
// try to get the header from the htcache directory
|
||||
try {
|
||||
responseHeader = Cache.getResponseHeader(url);
|
||||
} catch (final Exception e) {
|
||||
// ignore this. resource info loading failed
|
||||
}
|
||||
}
|
||||
|
||||
// STEP 2: if the metadata is still null try to download it from web
|
||||
if ((responseHeader == null) && (url.getProtocol().startsWith("http"))) {
|
||||
// TODO: we need a better solution here
|
||||
// e.g. encapsulate this in the crawlLoader class
|
||||
|
||||
// getting URL mimeType
|
||||
try {
|
||||
responseHeader = Client.whead(url.toString());
|
||||
} catch (final Exception e) {
|
||||
// ingore this. http header download failed
|
||||
}
|
||||
}
|
||||
|
||||
// STEP 3: if the metadata is still null try to guess the mimeType of the resource
|
||||
String supportError = Parser.supports(url, responseHeader == null ? null : responseHeader.mime());
|
||||
if (supportError != null) {
|
||||
log.logInfo("could not generate snippet for " + url.toNormalform(true, false) + ": " + supportError);
|
||||
return null;
|
||||
}
|
||||
if (responseHeader == null) {
|
||||
return Parser.parseSource(url, null, null, contentLength, resourceStream);
|
||||
}
|
||||
return Parser.parseSource(url, responseHeader.mime(), responseHeader.getCharacterEncoding(), contentLength, resourceStream);
|
||||
} catch (final InterruptedException e) {
|
||||
// interruption of thread detected
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
*
|
||||
* @param url
|
||||
* @param fetchOnline
|
||||
* @param socketTimeout
|
||||
* @param forText
|
||||
* @return an Object array containing
|
||||
* <table>
|
||||
* <tr><td>[0]</td><td>the content as {@link InputStream}</td></tr>
|
||||
* <tr><td>[1]</td><td>the content-length as {@link Integer}</td></tr>
|
||||
* </table>
|
||||
* @throws IOException
|
||||
*/
|
||||
public static Object[] getResource(final yacyURL url, final boolean fetchOnline, final int socketTimeout, final boolean forText, final boolean reindexing) throws IOException {
|
||||
// load the url as resource from the web
|
||||
long contentLength = -1;
|
||||
|
||||
// trying to load the resource body from cache
|
||||
InputStream resource = Cache.getContentStream(url);
|
||||
if (resource != null) {
|
||||
contentLength = Cache.getResourceContentLength(url);
|
||||
} else if (fetchOnline) {
|
||||
// if the content is not available in cache try to download it from web
|
||||
|
||||
// try to download the resource using a crawler
|
||||
final Response entry = Switchboard.getSwitchboard().loader.load(url, forText, reindexing);
|
||||
if (entry == null) return null; // not found in web
|
||||
|
||||
// read resource body (if it is there)
|
||||
final byte[] resourceArray = entry.getContent();
|
||||
|
||||
// in case that the resource was not in ram, read it from disk
|
||||
if (resourceArray == null) {
|
||||
resource = Cache.getContentStream(url);
|
||||
contentLength = Cache.getResourceContentLength(url);
|
||||
} else {
|
||||
resource = new ByteArrayInputStream(resourceArray);
|
||||
contentLength = resourceArray.length;
|
||||
}
|
||||
} else {
|
||||
return null;
|
||||
}
|
||||
return new Object[]{resource, Long.valueOf(contentLength)};
|
||||
}
|
||||
|
||||
public static String failConsequences(final TextSnippet snippet, final String eventID) throws IOException {
|
||||
// problems with snippet fetch
|
||||
final String urlHash = snippet.getUrl().hash();
|
||||
final String querystring = SetTools.setToString(snippet.getRemainingHashes(), ' ');
|
||||
if ((snippet.getErrorCode() == ERROR_SOURCE_LOADING) ||
|
||||
(snippet.getErrorCode() == ERROR_RESOURCE_LOADING) ||
|
||||
(snippet.getErrorCode() == ERROR_PARSER_FAILED) ||
|
||||
(snippet.getErrorCode() == ERROR_PARSER_NO_LINES)) {
|
||||
log.logInfo("error: '" + snippet.getError() + "', remove url = " + snippet.getUrl().toNormalform(false, true) + ", cause: " + snippet.getError());
|
||||
Switchboard.getSwitchboard().indexSegment.urlMetadata().remove(urlHash);
|
||||
final SearchEvent event = SearchEventCache.getEvent(eventID);
|
||||
assert Switchboard.getSwitchboard() != null;
|
||||
assert Switchboard.getSwitchboard().indexSegment != null;
|
||||
assert event != null : "eventID = " + eventID;
|
||||
assert event.getQuery() != null;
|
||||
Switchboard.getSwitchboard().indexSegment.termIndex().remove(event.getQuery().queryHashes, urlHash);
|
||||
event.remove(urlHash);
|
||||
}
|
||||
if (snippet.getErrorCode() == ERROR_NO_MATCH) {
|
||||
log.logInfo("error: '" + snippet.getError() + "', remove words '" + querystring + "' for url = " + snippet.getUrl().toNormalform(false, true) + ", cause: " + snippet.getError());
|
||||
Switchboard.getSwitchboard().indexSegment.termIndex().remove(snippet.remaingHashes, urlHash);
|
||||
SearchEventCache.getEvent(eventID).remove(urlHash);
|
||||
}
|
||||
return snippet.getError();
|
||||
}
|
||||
|
||||
}
|
||||
@ -0,0 +1,597 @@
|
||||
// TextSnippet.java
|
||||
// -----------------
|
||||
// (C) by Michael Peter Christen; mc@yacy.net
|
||||
// first published on http://www.anomic.de
|
||||
// Frankfurt, Germany, 2005
|
||||
// last major change: 10.09.2009
|
||||
//
|
||||
// contributions by Marc Nause [MN]
|
||||
//
|
||||
// This program is free software; you can redistribute it and/or modify
|
||||
// it under the terms of the GNU General Public License as published by
|
||||
// the Free Software Foundation; either version 2 of the License, or
|
||||
// (at your option) any later version.
|
||||
//
|
||||
// This program is distributed in the hope that it will be useful,
|
||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU General Public License for more details.
|
||||
//
|
||||
// You should have received a copy of the GNU General Public License
|
||||
// along with this program; if not, write to the Free Software
|
||||
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||||
|
||||
package de.anomic.search;
|
||||
|
||||
import java.io.ByteArrayInputStream;
|
||||
import java.io.IOException;
|
||||
import java.io.InputStream;
|
||||
import java.util.ArrayList;
|
||||
import java.util.Iterator;
|
||||
import java.util.Set;
|
||||
import java.util.TreeMap;
|
||||
import java.util.TreeSet;
|
||||
import java.util.regex.Matcher;
|
||||
import java.util.regex.Pattern;
|
||||
|
||||
import de.anomic.crawler.retrieval.Response;
|
||||
import de.anomic.document.Condenser;
|
||||
import de.anomic.document.Document;
|
||||
import de.anomic.document.ParserException;
|
||||
import de.anomic.document.Word;
|
||||
import de.anomic.document.parser.html.CharacterCoding;
|
||||
import de.anomic.http.client.Cache;
|
||||
import de.anomic.http.metadata.ResponseHeader;
|
||||
import de.anomic.kelondro.index.SimpleARC;
|
||||
import de.anomic.kelondro.order.Base64Order;
|
||||
import de.anomic.kelondro.text.metadataPrototype.URLMetadataRow;
|
||||
import de.anomic.kelondro.util.SetTools;
|
||||
import de.anomic.yacy.yacySearch;
|
||||
import de.anomic.yacy.yacyURL;
|
||||
import de.anomic.yacy.logging.Log;
|
||||
|
||||
public class TextSnippet {
|
||||
|
||||
private static final int maxCache = 1000;
|
||||
|
||||
public static final int SOURCE_CACHE = 0;
|
||||
public static final int SOURCE_FILE = 1;
|
||||
public static final int SOURCE_WEB = 2;
|
||||
public static final int SOURCE_METADATA = 3;
|
||||
|
||||
public static final int ERROR_NO_HASH_GIVEN = 11;
|
||||
public static final int ERROR_SOURCE_LOADING = 12;
|
||||
public static final int ERROR_RESOURCE_LOADING = 13;
|
||||
public static final int ERROR_PARSER_FAILED = 14;
|
||||
public static final int ERROR_PARSER_NO_LINES = 15;
|
||||
public static final int ERROR_NO_MATCH = 16;
|
||||
|
||||
private static final SimpleARC<String, String> snippetsCache = new SimpleARC<String, String>(maxCache);
|
||||
private static final SimpleARC<String, yacyURL> faviconCache = new SimpleARC<String, yacyURL>(maxCache);
|
||||
|
||||
private final yacyURL url;
|
||||
private String line;
|
||||
private final String error;
|
||||
private final int errorCode;
|
||||
private TreeSet<byte[]> remaingHashes;
|
||||
private final yacyURL favicon;
|
||||
|
||||
private static Log log = null;
|
||||
private static Switchboard sb = null;
|
||||
|
||||
|
||||
public static void init(
|
||||
final Log logx,
|
||||
final Switchboard switchboard
|
||||
) {
|
||||
log = logx;
|
||||
sb = switchboard;
|
||||
}
|
||||
|
||||
public static boolean existsInCache(final yacyURL url, final TreeSet<byte[]> queryhashes) {
|
||||
final String hashes = yacySearch.set2string(queryhashes);
|
||||
return retrieveFromCache(hashes, url.hash()) != null;
|
||||
}
|
||||
|
||||
public static void storeToCache(final String wordhashes, final String urlhash, final String snippet) {
|
||||
// generate key
|
||||
String key = urlhash + wordhashes;
|
||||
|
||||
// do nothing if snippet is known
|
||||
if (snippetsCache.containsKey(key)) return;
|
||||
|
||||
// learn new snippet
|
||||
snippetsCache.put(key, snippet);
|
||||
}
|
||||
|
||||
public static String retrieveFromCache(final String wordhashes, final String urlhash) {
|
||||
// generate key
|
||||
final String key = urlhash + wordhashes;
|
||||
return snippetsCache.get(key);
|
||||
}
|
||||
|
||||
public static TreeSet<byte[]> removeAppearanceHashes(final String sentence, final TreeSet<byte[]> queryhashes) {
|
||||
// remove all hashes that appear in the sentence
|
||||
if (sentence == null) return queryhashes;
|
||||
final TreeMap<byte[], Integer> hs = Condenser.hashSentence(sentence);
|
||||
final Iterator<byte[]> j = queryhashes.iterator();
|
||||
byte[] hash;
|
||||
Integer pos;
|
||||
final TreeSet<byte[]> remaininghashes = new TreeSet<byte[]>(Base64Order.enhancedCoder);
|
||||
while (j.hasNext()) {
|
||||
hash = j.next();
|
||||
pos = hs.get(hash);
|
||||
if (pos == null) {
|
||||
remaininghashes.add(hash);
|
||||
}
|
||||
}
|
||||
return remaininghashes;
|
||||
}
|
||||
|
||||
/**
|
||||
* <code>\\A[^\\p{L}\\p{N}].+</code>
|
||||
*/
|
||||
private final static Pattern p1 = Pattern.compile("\\A[^\\p{L}\\p{N}].+");
|
||||
/**
|
||||
* <code>.+[^\\p{L}\\p{N}]\\Z</code>
|
||||
*/
|
||||
private final static Pattern p2 = Pattern.compile(".+[^\\p{L}\\p{N}]\\Z");
|
||||
/**
|
||||
* <code>\\A[\\p{L}\\p{N}]+[^\\p{L}\\p{N}].+\\Z</code>
|
||||
*/
|
||||
private final static Pattern p3 = Pattern.compile("\\A[\\p{L}\\p{N}]+[^\\p{L}\\p{N}].+\\Z");
|
||||
/**
|
||||
* <code>[^\\p{L}\\p{N}]</code>
|
||||
*/
|
||||
private final static Pattern p4 = Pattern.compile("[^\\p{L}\\p{N}]");
|
||||
/**
|
||||
* <code>(.*?)(\\<b\\>.+?\\</b\\>)(.*)</code>
|
||||
*/
|
||||
private final static Pattern p01 = Pattern.compile("(.*?)(\\<b\\>.+?\\</b\\>)(.*)"); // marked words are in <b>-tags
|
||||
|
||||
public TextSnippet(final yacyURL url, final String line, final int errorCode, final TreeSet<byte[]> remaingHashes, final String errortext) {
|
||||
this(url,line,errorCode,remaingHashes,errortext,null);
|
||||
}
|
||||
|
||||
public TextSnippet(final yacyURL url, final String line, final int errorCode, final TreeSet<byte[]> remaingHashes, final String errortext, final yacyURL favicon) {
|
||||
this.url = url;
|
||||
this.line = line;
|
||||
this.errorCode = errorCode;
|
||||
this.error = errortext;
|
||||
this.remaingHashes = remaingHashes;
|
||||
this.favicon = favicon;
|
||||
}
|
||||
public yacyURL getUrl() {
|
||||
return this.url;
|
||||
}
|
||||
public yacyURL getFavicon() {
|
||||
return this.favicon;
|
||||
}
|
||||
public boolean exists() {
|
||||
return line != null;
|
||||
}
|
||||
public String toString() {
|
||||
return (line == null) ? "" : line;
|
||||
}
|
||||
public String getLineRaw() {
|
||||
return (line == null) ? "" : line;
|
||||
}
|
||||
public String getError() {
|
||||
return (error == null) ? "" : error.trim();
|
||||
}
|
||||
public int getErrorCode() {
|
||||
return errorCode;
|
||||
}
|
||||
public TreeSet<byte[]> getRemainingHashes() {
|
||||
return this.remaingHashes;
|
||||
}
|
||||
public String getLineMarked(final TreeSet<byte[]> queryHashes) {
|
||||
if (line == null) return "";
|
||||
if ((queryHashes == null) || (queryHashes.size() == 0)) return line.trim();
|
||||
if (line.endsWith(".")) line = line.substring(0, line.length() - 1);
|
||||
final Iterator<byte[]> i = queryHashes.iterator();
|
||||
byte[] h;
|
||||
final String[] w = line.split(" ");
|
||||
while (i.hasNext()) {
|
||||
h = i.next();
|
||||
for (int j = 0; j < w.length; j++) {
|
||||
final ArrayList<String> al = markedWordArrayList(w[j]); // mark special character separated words correctly if more than 1 word has to be marked
|
||||
w[j] = "";
|
||||
for (int k = 0; k < al.size(); k++) {
|
||||
if(k % 2 == 0){ // word has not been marked
|
||||
w[j] += getWordMarked(al.get(k), h);
|
||||
} else { // word has been marked, do not encode again
|
||||
w[j] += al.get(k);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
final StringBuilder l = new StringBuilder(line.length() + queryHashes.size() * 8);
|
||||
for (int j = 0; j < w.length; j++) {
|
||||
l.append(w[j]);
|
||||
l.append(' ');
|
||||
}
|
||||
return l.toString().trim();
|
||||
}
|
||||
|
||||
/**
|
||||
* mark words with <b>-tags
|
||||
* @param word the word to mark
|
||||
* @param h the hash of the word to mark
|
||||
* @return the marked word if hash matches, else the unmarked word
|
||||
* @see #getLineMarked(Set)
|
||||
*/
|
||||
private static String getWordMarked(String word, byte[] h){
|
||||
//ignore punctuation marks (contrib [MN])
|
||||
//note to myself:
|
||||
//For details on regex see "Mastering regular expressions" by J.E.F. Friedl
|
||||
//especially p. 123 and p. 390/391 (in the German version of the 2nd edition)
|
||||
|
||||
String prefix = "";
|
||||
String postfix = "";
|
||||
int len = 0;
|
||||
|
||||
// cut off prefix if it contains of non-characters or non-numbers
|
||||
while(p1.matcher(word).find()) {
|
||||
prefix = prefix + word.substring(0,1);
|
||||
word = word.substring(1);
|
||||
}
|
||||
|
||||
// cut off postfix if it contains of non-characters or non-numbers
|
||||
while(p2.matcher(word).find()) {
|
||||
len = word.length();
|
||||
postfix = word.substring(len-1,len) + postfix;
|
||||
word = word.substring(0,len-1);
|
||||
}
|
||||
|
||||
//special treatment if there is a special character in the word
|
||||
if(p3.matcher(word).find()) {
|
||||
String out = "";
|
||||
String temp = "";
|
||||
for(int k=0; k < word.length(); k++) {
|
||||
//is character a special character?
|
||||
if(p4.matcher(word.substring(k,k+1)).find()) {
|
||||
if (new String(Word.word2hash(temp)).equals(new String(h))) temp = "<b>" + CharacterCoding.unicode2html(temp, false) + "</b>";
|
||||
out = out + temp + CharacterCoding.unicode2html(word.substring(k,k+1), false);
|
||||
temp = "";
|
||||
}
|
||||
//last character
|
||||
else if(k == (word.length()-1)) {
|
||||
temp = temp + word.substring(k,k+1);
|
||||
if (new String(Word.word2hash(temp)).equals(new String(h))) temp = "<b>" + CharacterCoding.unicode2html(temp, false) + "</b>";
|
||||
out = out + temp;
|
||||
temp = "";
|
||||
}
|
||||
else temp = temp + word.substring(k,k+1);
|
||||
}
|
||||
word = out;
|
||||
}
|
||||
|
||||
//end contrib [MN]
|
||||
else if (new String(Word.word2hash(word)).equals(new String(h))) word = "<b>" + CharacterCoding.unicode2html(word, false) + "</b>";
|
||||
|
||||
word = CharacterCoding.unicode2html(prefix, false)
|
||||
+ word
|
||||
+ CharacterCoding.unicode2html(postfix, false);
|
||||
return word;
|
||||
}
|
||||
|
||||
/**
|
||||
* words that already has been marked has index <code>(i % 2 == 1)</code>
|
||||
* words that has not yet been marked has index <code>(i % 2 == 0)</code>
|
||||
* @param string the String to be processed
|
||||
* @return words that already has and has not yet been marked
|
||||
* @author [DW], 08.11.2008
|
||||
*/
|
||||
private static ArrayList<String> markedWordArrayList(String string){
|
||||
ArrayList<String> al = new java.util.ArrayList<String>(1);
|
||||
Matcher m = p01.matcher(string);
|
||||
while (m.find()) {
|
||||
al.add(m.group(1));
|
||||
al.add(m.group(2));
|
||||
string = m.group(3); // the postfix
|
||||
m = p01.matcher(string);
|
||||
}
|
||||
al.add(string);
|
||||
return al;
|
||||
}
|
||||
|
||||
@SuppressWarnings("unchecked")
|
||||
public static TextSnippet retrieveTextSnippet(final URLMetadataRow.Components comp, final TreeSet<byte[]> queryhashes, final boolean fetchOnline, final boolean pre, final int snippetMaxLength, final int maxDocLen, final boolean reindexing) {
|
||||
// heise = "0OQUNU3JSs05"
|
||||
final yacyURL url = comp.url();
|
||||
if (queryhashes.size() == 0) {
|
||||
//System.out.println("found no queryhashes for URL retrieve " + url);
|
||||
return new TextSnippet(url, null, ERROR_NO_HASH_GIVEN, queryhashes, "no query hashes given");
|
||||
}
|
||||
|
||||
// try to get snippet from snippetCache
|
||||
int source = SOURCE_CACHE;
|
||||
final String wordhashes = yacySearch.set2string(queryhashes);
|
||||
String line = retrieveFromCache(wordhashes, url.hash());
|
||||
if (line != null) {
|
||||
// found the snippet
|
||||
return new TextSnippet(url, line, source, null, null, faviconCache.get(url.hash()));
|
||||
}
|
||||
|
||||
/* ===========================================================================
|
||||
* LOADING RESOURCE DATA
|
||||
* =========================================================================== */
|
||||
// if the snippet is not in the cache, we can try to get it from the htcache
|
||||
long resContentLength = 0;
|
||||
InputStream resContent = null;
|
||||
ResponseHeader responseHeader = null;
|
||||
try {
|
||||
// first try to get the snippet from metadata
|
||||
String loc;
|
||||
if (containsAllHashes(loc = comp.dc_title(), queryhashes)) {
|
||||
// try to create the snippet from information given in the url itself
|
||||
return new TextSnippet(url, loc, SOURCE_METADATA, null, null, faviconCache.get(url.hash()));
|
||||
} else if (containsAllHashes(loc = comp.dc_creator(), queryhashes)) {
|
||||
// try to create the snippet from information given in the creator metadata
|
||||
return new TextSnippet(url, loc, SOURCE_METADATA, null, null, faviconCache.get(url.hash()));
|
||||
} else if (containsAllHashes(loc = comp.dc_subject(), queryhashes)) {
|
||||
// try to create the snippet from information given in the subject metadata
|
||||
return new TextSnippet(url, loc, SOURCE_METADATA, null, null, faviconCache.get(url.hash()));
|
||||
} else if (containsAllHashes(loc = comp.url().toNormalform(true, true).replace('-', ' '), queryhashes)) {
|
||||
// try to create the snippet from information given in the subject metadata
|
||||
return new TextSnippet(url, loc, SOURCE_METADATA, null, null, faviconCache.get(url.hash()));
|
||||
} else {
|
||||
// trying to load the resource from the cache
|
||||
resContent = Cache.getContentStream(url);
|
||||
responseHeader = Cache.getResponseHeader(url);
|
||||
if (resContent != null && ((resContentLength = Cache.getResourceContentLength(url)) > maxDocLen) && (!fetchOnline)) {
|
||||
// content may be too large to be parsed here. To be fast, we omit calculation of snippet here
|
||||
return new TextSnippet(url, null, ERROR_SOURCE_LOADING, queryhashes, "resource available, but too large: " + resContentLength + " bytes");
|
||||
} else if (fetchOnline) {
|
||||
// if not found try to download it
|
||||
|
||||
// download resource using the crawler and keep resource in memory if possible
|
||||
final Response entry = Switchboard.getSwitchboard().loader.load(url, true, reindexing);
|
||||
|
||||
// getting resource metadata (e.g. the http headers for http resources)
|
||||
if (entry != null) {
|
||||
// place entry on indexing queue
|
||||
sb.toIndexer(entry);
|
||||
|
||||
// read resource body (if it is there)
|
||||
final byte []resourceArray = entry.getContent();
|
||||
if (resourceArray != null) {
|
||||
resContent = new ByteArrayInputStream(resourceArray);
|
||||
resContentLength = resourceArray.length;
|
||||
} else {
|
||||
resContent = Cache.getContentStream(url);
|
||||
resContentLength = Cache.getResourceContentLength(url);
|
||||
}
|
||||
}
|
||||
|
||||
// if it is still not available, report an error
|
||||
if (resContent == null) return new TextSnippet(url, null, ERROR_RESOURCE_LOADING, queryhashes, "error loading resource, plasmaHTCache.Entry cache is NULL");
|
||||
|
||||
source = SOURCE_WEB;
|
||||
} else {
|
||||
return new TextSnippet(url, null, ERROR_SOURCE_LOADING, queryhashes, "no resource available");
|
||||
}
|
||||
}
|
||||
} catch (final Exception e) {
|
||||
//e.printStackTrace();
|
||||
return new TextSnippet(url, null, ERROR_SOURCE_LOADING, queryhashes, "error loading resource: " + e.getMessage());
|
||||
}
|
||||
|
||||
/* ===========================================================================
|
||||
* PARSING RESOURCE
|
||||
* =========================================================================== */
|
||||
Document document = null;
|
||||
try {
|
||||
document = Document.parseDocument(url, resContentLength, resContent, responseHeader);
|
||||
} catch (final ParserException e) {
|
||||
return new TextSnippet(url, null, ERROR_PARSER_FAILED, queryhashes, e.getMessage()); // cannot be parsed
|
||||
} finally {
|
||||
try { resContent.close(); } catch (final Exception e) {/* ignore this */}
|
||||
}
|
||||
if (document == null) return new TextSnippet(url, null, ERROR_PARSER_FAILED, queryhashes, "parser error/failed"); // cannot be parsed
|
||||
|
||||
|
||||
/* ===========================================================================
|
||||
* COMPUTE SNIPPET
|
||||
* =========================================================================== */
|
||||
final yacyURL resFavicon = document.getFavicon();
|
||||
if (resFavicon != null) faviconCache.put(url.hash(), resFavicon);
|
||||
// we have found a parseable non-empty file: use the lines
|
||||
|
||||
// compute snippet from text
|
||||
final Iterator<StringBuilder> sentences = document.getSentences(pre);
|
||||
if (sentences == null) return new TextSnippet(url, null, ERROR_PARSER_NO_LINES, queryhashes, "parser returned no sentences",resFavicon);
|
||||
final Object[] tsr = computeTextSnippet(sentences, queryhashes, snippetMaxLength);
|
||||
final String textline = (tsr == null) ? null : (String) tsr[0];
|
||||
final TreeSet<byte[]> remainingHashes = (tsr == null) ? queryhashes : (TreeSet<byte[]>) tsr[1];
|
||||
|
||||
// compute snippet from media
|
||||
//String audioline = computeMediaSnippet(document.getAudiolinks(), queryhashes);
|
||||
//String videoline = computeMediaSnippet(document.getVideolinks(), queryhashes);
|
||||
//String appline = computeMediaSnippet(document.getApplinks(), queryhashes);
|
||||
//String hrefline = computeMediaSnippet(document.getAnchors(), queryhashes);
|
||||
//String imageline = computeMediaSnippet(document.getAudiolinks(), queryhashes);
|
||||
|
||||
line = "";
|
||||
//if (audioline != null) line += (line.length() == 0) ? audioline : "<br />" + audioline;
|
||||
//if (videoline != null) line += (line.length() == 0) ? videoline : "<br />" + videoline;
|
||||
//if (appline != null) line += (line.length() == 0) ? appline : "<br />" + appline;
|
||||
//if (hrefline != null) line += (line.length() == 0) ? hrefline : "<br />" + hrefline;
|
||||
if (textline != null) line += (line.length() == 0) ? textline : "<br />" + textline;
|
||||
|
||||
if ((line == null) || (remainingHashes.size() > 0)) return new TextSnippet(url, null, ERROR_NO_MATCH, remainingHashes, "no matching snippet found",resFavicon);
|
||||
if (line.length() > snippetMaxLength) line = line.substring(0, snippetMaxLength);
|
||||
|
||||
// finally store this snippet in our own cache
|
||||
storeToCache(wordhashes, url.hash(), line);
|
||||
|
||||
document.close();
|
||||
return new TextSnippet(url, line, source, null, null, resFavicon);
|
||||
}
|
||||
|
||||
private static boolean containsAllHashes(final String sentence, final Set<byte[]> queryhashes) {
|
||||
final TreeMap<byte[], Integer> m = Condenser.hashSentence(sentence);
|
||||
final Iterator<byte[]> i = queryhashes.iterator();
|
||||
while (i.hasNext()) {
|
||||
if (!(m.containsKey(i.next()))) return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
@SuppressWarnings("unchecked")
|
||||
private static Object[] /*{String - the snippet, Set - remaining hashes}*/
|
||||
computeTextSnippet(final Iterator<StringBuilder> sentences, final TreeSet<byte[]> queryhashes, int maxLength) {
|
||||
try {
|
||||
if (sentences == null) return null;
|
||||
if ((queryhashes == null) || (queryhashes.size() == 0)) return null;
|
||||
Iterator<byte[]> j;
|
||||
TreeMap<byte[], Integer> hs;
|
||||
StringBuilder sentence;
|
||||
final TreeMap<Integer, StringBuilder> os = new TreeMap<Integer, StringBuilder>();
|
||||
int uniqCounter = 9999;
|
||||
int score;
|
||||
while (sentences.hasNext()) {
|
||||
sentence = sentences.next();
|
||||
hs = Condenser.hashSentence(sentence.toString());
|
||||
j = queryhashes.iterator();
|
||||
score = 0;
|
||||
while (j.hasNext()) {if (hs.containsKey(j.next())) score++;}
|
||||
if (score > 0) {
|
||||
os.put(Integer.valueOf(1000000 * score - sentence.length() * 10000 + uniqCounter--), sentence);
|
||||
}
|
||||
}
|
||||
|
||||
String result;
|
||||
TreeSet<byte[]> remaininghashes;
|
||||
while (os.size() > 0) {
|
||||
sentence = os.remove(os.lastKey()); // sentence with the biggest score
|
||||
Object[] tsr = computeTextSnippet(sentence.toString(), queryhashes, maxLength);
|
||||
if (tsr == null) continue;
|
||||
result = (String) tsr[0];
|
||||
if ((result != null) && (result.length() > 0)) {
|
||||
remaininghashes = (TreeSet<byte[]>) tsr[1];
|
||||
if (remaininghashes.size() == 0) {
|
||||
// we have found the snippet
|
||||
return new Object[]{result, remaininghashes};
|
||||
} else if (remaininghashes.size() < queryhashes.size()) {
|
||||
// the result has not all words in it.
|
||||
// find another sentence that represents the missing other words
|
||||
// and find recursively more sentences
|
||||
maxLength = maxLength - result.length();
|
||||
if (maxLength < 20) maxLength = 20;
|
||||
tsr = computeTextSnippet(os.values().iterator(), remaininghashes, maxLength);
|
||||
if (tsr == null) return null;
|
||||
final String nextSnippet = (String) tsr[0];
|
||||
if (nextSnippet == null) return tsr;
|
||||
return new Object[]{result + (" / " + nextSnippet), tsr[1]};
|
||||
} else {
|
||||
// error
|
||||
//assert remaininghashes.size() < queryhashes.size() : "remaininghashes.size() = " + remaininghashes.size() + ", queryhashes.size() = " + queryhashes.size() + ", sentence = '" + sentence + "', result = '" + result + "'";
|
||||
continue;
|
||||
}
|
||||
}
|
||||
}
|
||||
return null;
|
||||
} catch (final IndexOutOfBoundsException e) {
|
||||
log.logSevere("computeSnippet: error with string generation", e);
|
||||
return new Object[]{null, queryhashes};
|
||||
}
|
||||
}
|
||||
|
||||
private static Object[] /*{String - the snippet, Set - remaining hashes}*/
|
||||
computeTextSnippet(String sentence, final TreeSet<byte[]> queryhashes, final int maxLength) {
|
||||
try {
|
||||
if (sentence == null) return null;
|
||||
if ((queryhashes == null) || (queryhashes.size() == 0)) return null;
|
||||
byte[] hash;
|
||||
|
||||
// find all hashes that appear in the sentence
|
||||
final TreeMap<byte[], Integer> hs = Condenser.hashSentence(sentence);
|
||||
final Iterator<byte[]> j = queryhashes.iterator();
|
||||
Integer pos;
|
||||
int p, minpos = sentence.length(), maxpos = -1;
|
||||
final TreeSet<byte[]> remainingHashes = new TreeSet<byte[]>(Base64Order.enhancedCoder);
|
||||
while (j.hasNext()) {
|
||||
hash = j.next();
|
||||
pos = hs.get(hash);
|
||||
if (pos == null) {
|
||||
remainingHashes.add(hash);
|
||||
} else {
|
||||
p = pos.intValue();
|
||||
if (p > maxpos) maxpos = p;
|
||||
if (p < minpos) minpos = p;
|
||||
}
|
||||
}
|
||||
// check result size
|
||||
maxpos = maxpos + 10;
|
||||
if (maxpos > sentence.length()) maxpos = sentence.length();
|
||||
if (minpos < 0) minpos = 0;
|
||||
// we have a result, but is it short enough?
|
||||
if (maxpos - minpos + 10 > maxLength) {
|
||||
// the string is too long, even if we cut at both ends
|
||||
// so cut here in the middle of the string
|
||||
final int lenb = sentence.length();
|
||||
sentence = sentence.substring(0, (minpos + 20 > sentence.length()) ? sentence.length() : minpos + 20).trim() +
|
||||
" [..] " +
|
||||
sentence.substring((maxpos + 26 > sentence.length()) ? sentence.length() : maxpos + 26).trim();
|
||||
maxpos = maxpos + lenb - sentence.length() + 6;
|
||||
}
|
||||
if (maxpos > maxLength) {
|
||||
// the string is too long, even if we cut it at the end
|
||||
// so cut it here at both ends at once
|
||||
assert maxpos >= minpos;
|
||||
final int newlen = Math.max(10, maxpos - minpos + 10);
|
||||
final int around = (maxLength - newlen) / 2;
|
||||
assert minpos - around < sentence.length() : "maxpos = " + maxpos + ", minpos = " + minpos + ", around = " + around + ", sentence.length() = " + sentence.length();
|
||||
//assert ((maxpos + around) <= sentence.length()) && ((maxpos + around) <= sentence.length()) : "maxpos = " + maxpos + ", minpos = " + minpos + ", around = " + around + ", sentence.length() = " + sentence.length();
|
||||
sentence = "[..] " + sentence.substring(minpos - around, ((maxpos + around) > sentence.length()) ? sentence.length() : (maxpos + around)).trim() + " [..]";
|
||||
minpos = around;
|
||||
maxpos = sentence.length() - around - 5;
|
||||
}
|
||||
if (sentence.length() > maxLength) {
|
||||
// trim sentence, 1st step (cut at right side)
|
||||
sentence = sentence.substring(0, maxpos).trim() + " [..]";
|
||||
}
|
||||
if (sentence.length() > maxLength) {
|
||||
// trim sentence, 2nd step (cut at left side)
|
||||
sentence = "[..] " + sentence.substring(minpos).trim();
|
||||
}
|
||||
if (sentence.length() > maxLength) {
|
||||
// trim sentence, 3rd step (cut in the middle)
|
||||
sentence = sentence.substring(6, 20).trim() + " [..] " + sentence.substring(sentence.length() - 26, sentence.length() - 6).trim();
|
||||
}
|
||||
return new Object[] {sentence, remainingHashes};
|
||||
} catch (final IndexOutOfBoundsException e) {
|
||||
log.logSevere("computeSnippet: error with string generation", e);
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
public static String failConsequences(final TextSnippet snippet, final String eventID) throws IOException {
|
||||
// problems with snippet fetch
|
||||
final String urlHash = snippet.getUrl().hash();
|
||||
final String querystring = SetTools.setToString(snippet.getRemainingHashes(), ' ');
|
||||
if ((snippet.getErrorCode() == ERROR_SOURCE_LOADING) ||
|
||||
(snippet.getErrorCode() == ERROR_RESOURCE_LOADING) ||
|
||||
(snippet.getErrorCode() == ERROR_PARSER_FAILED) ||
|
||||
(snippet.getErrorCode() == ERROR_PARSER_NO_LINES)) {
|
||||
log.logInfo("error: '" + snippet.getError() + "', remove url = " + snippet.getUrl().toNormalform(false, true) + ", cause: " + snippet.getError());
|
||||
Switchboard.getSwitchboard().indexSegment.urlMetadata().remove(urlHash);
|
||||
final SearchEvent event = SearchEventCache.getEvent(eventID);
|
||||
assert Switchboard.getSwitchboard() != null;
|
||||
assert Switchboard.getSwitchboard().indexSegment != null;
|
||||
assert event != null : "eventID = " + eventID;
|
||||
assert event.getQuery() != null;
|
||||
Switchboard.getSwitchboard().indexSegment.termIndex().remove(event.getQuery().queryHashes, urlHash);
|
||||
event.remove(urlHash);
|
||||
}
|
||||
if (snippet.getErrorCode() == ERROR_NO_MATCH) {
|
||||
log.logInfo("error: '" + snippet.getError() + "', remove words '" + querystring + "' for url = " + snippet.getUrl().toNormalform(false, true) + ", cause: " + snippet.getError());
|
||||
Switchboard.getSwitchboard().indexSegment.termIndex().remove(snippet.getRemainingHashes(), urlHash);
|
||||
SearchEventCache.getEvent(eventID).remove(urlHash);
|
||||
}
|
||||
return snippet.getError();
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in new issue