mirror of
https://github.com/yacy/yacy_search_server.git
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b6fb239e74
some file types are containers for several files. These containers had been parsed in such a way that the set of resulting parsed content was merged into one single document before parsing. Using this parser infrastructure it is not possible to parse document containers that contain individual files. An example is a rss file where the rss messages can be treated as individual documents with their own url reference. Another example is a surrogate file which was treated with a special operation outside of the parser infrastructure. This commit introduces a redesigned parser interface and a new abstract parser implementation. The new parser interface has now only one entry point and returns always a set of parsed documents. In case of single documents the parser method returns a set of one documents. To be compliant with the new interface, the zip and tar parser had been also completely redesigned. All parsers are now much more simple and cleaner in its structure. The switchboard operations had been extended to operate with sets of parsed files, not single parsed files. additionally, parsing of jar manifest files had been added. git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@6955 6c8d7289-2bf4-0310-a012-ef5d649a1542
227 lines
10 KiB
Java
227 lines
10 KiB
Java
// MediaSnippet.java
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// -----------------
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2005
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//
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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.search;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Comparator;
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import java.util.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.CrawlProfile;
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import de.anomic.data.MimeTable;
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import net.yacy.cora.document.MultiProtocolURI;
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import net.yacy.document.Document;
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import net.yacy.document.Parser;
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import net.yacy.document.parser.html.ImageEntry;
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import net.yacy.kelondro.data.meta.DigestURI;
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import net.yacy.kelondro.index.HandleSet;
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import net.yacy.kelondro.logging.Log;
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import net.yacy.kelondro.order.Base64Order;
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import net.yacy.kelondro.util.ByteArray;
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public class MediaSnippet implements Comparable<MediaSnippet>, Comparator<MediaSnippet> {
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public ContentDomain type;
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public DigestURI href, source;
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public String name, attr, mime;
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public int ranking;
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public int width, height;
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public long fileSize;
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public MediaSnippet(final ContentDomain type, final DigestURI href, final String mime, final String name, final long fileSize, final String attr, final int ranking, final DigestURI source) {
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this.type = type;
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this.href = href;
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this.mime = mime;
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this.fileSize = fileSize;
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this.source = source; // the web page where the media resource appeared
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this.name = name;
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this.attr = attr;
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this.width = -1;
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this.height = -1;
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int p = 0;
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if (attr != null && (p = attr.indexOf(" x ")) > 0) {
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this.width = Integer.parseInt(attr.substring(0, p).trim());
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this.height = Integer.parseInt(attr.substring(p + 3).trim());
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}
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this.ranking = ranking; // the smaller the better! small values should be shown first
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if ((this.name == null) || (this.name.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 MediaSnippet(final ContentDomain type, final DigestURI href, final String mime, final String name, final long fileSize, final int width, final int height, final int ranking, final DigestURI source) {
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this.type = type;
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this.href = href;
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this.mime = mime;
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this.fileSize = fileSize;
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this.source = source; // the web page where the media resource appeared
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this.name = name;
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this.attr = width + " x " + height;
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this.width = width;
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this.height = height;
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this.ranking = ranking; // the smaller the better! small values should be shown first
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if ((this.name == null) || (this.name.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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@Override
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public int hashCode() {
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return ByteArray.hashCode(href.hash());
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}
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public String toString() {
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return new String(href.hash());
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}
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public boolean equals(final Object obj) {
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if (this == obj) return true;
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if (obj == null) return false;
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if (!(obj instanceof MediaSnippet)) return false;
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MediaSnippet other = (MediaSnippet) obj;
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return Base64Order.enhancedCoder.equal(this.href.hash(), other.href.hash());
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}
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public int compareTo(MediaSnippet o) {
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return Base64Order.enhancedCoder.compare(this.href.hash(), o.href.hash());
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}
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public int compare(MediaSnippet o1, MediaSnippet o2) {
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return o1.compareTo(o2);
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}
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public static ArrayList<MediaSnippet> retrieveMediaSnippets(final DigestURI url, final HandleSet queryhashes, final ContentDomain mediatype, final CrawlProfile.CacheStrategy cacheStrategy, final int timeout, final boolean reindexing) {
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if (queryhashes.isEmpty()) {
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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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Document document;
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try {
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document = Document.mergeDocuments(url, null, Switchboard.getSwitchboard().loader.loadDocuments(Switchboard.getSwitchboard().loader.request(url, false, reindexing), cacheStrategy, timeout, Long.MAX_VALUE));
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} catch (IOException e) {
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Log.logFine("snippet fetch", "load error: " + e.getMessage());
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return new ArrayList<MediaSnippet>();
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} catch (Parser.Failure e) {
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Log.logFine("snippet fetch", "parser error: " + e.getMessage());
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return new ArrayList<MediaSnippet>();
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}
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final ArrayList<MediaSnippet> a = new ArrayList<MediaSnippet>();
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if (document != null) {
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if ((mediatype == ContentDomain.ALL) || (mediatype == ContentDomain.AUDIO)) a.addAll(computeMediaSnippets(url, document, queryhashes, ContentDomain.AUDIO));
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if ((mediatype == ContentDomain.ALL) || (mediatype == ContentDomain.VIDEO)) a.addAll(computeMediaSnippets(url, document, queryhashes, ContentDomain.VIDEO));
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if ((mediatype == ContentDomain.ALL) || (mediatype == ContentDomain.APP)) a.addAll(computeMediaSnippets(url, document, queryhashes, ContentDomain.APP));
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if ((mediatype == ContentDomain.ALL) || (mediatype == ContentDomain.IMAGE)) a.addAll(computeImageSnippets(url, document, queryhashes));
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}
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return a;
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}
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public static ArrayList<MediaSnippet> computeMediaSnippets(final DigestURI source, final Document document, final HandleSet queryhashes, final ContentDomain mediatype) {
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if (document == null) return new ArrayList<MediaSnippet>();
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Map<MultiProtocolURI, String> media = null;
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if (mediatype == ContentDomain.AUDIO) media = document.getAudiolinks();
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else if (mediatype == ContentDomain.VIDEO) media = document.getVideolinks();
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else if (mediatype == ContentDomain.APP) media = document.getApplinks();
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if (media == null) return null;
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final Iterator<Map.Entry<MultiProtocolURI, String>> i = media.entrySet().iterator();
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Map.Entry<MultiProtocolURI, String> entry;
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DigestURI url;
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String desc;
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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 = new DigestURI(entry.getKey());
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desc = entry.getValue();
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int ranking = TextSnippet.removeAppearanceHashes(url.toNormalform(false, false), queryhashes).size() +
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TextSnippet.removeAppearanceHashes(desc, queryhashes).size();
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if (ranking < 2 * queryhashes.size()) {
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result.add(new MediaSnippet(mediatype, url, MimeTable.url2mime(url), desc, document.getTextLength(), null, ranking, source));
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}
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}
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return result;
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}
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public static ArrayList<MediaSnippet> computeImageSnippets(final DigestURI source, final Document document, final HandleSet 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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DigestURI url;
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String desc;
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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 = new DigestURI(ientry.url());
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String u = url.toString();
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if (u.indexOf(".ico") >= 0 || u.indexOf("favicon") >= 0) continue;
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if (ientry.height() > 0 && ientry.height() < 64) continue;
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if (ientry.width() > 0 && ientry.width() < 64) continue;
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desc = ientry.alt();
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int appcount = queryhashes.size() * 2 -
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TextSnippet.removeAppearanceHashes(url.toNormalform(false, false), queryhashes).size() -
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TextSnippet.removeAppearanceHashes(desc, queryhashes).size();
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final int ranking = Integer.MAX_VALUE - (ientry.height() + 1) * (ientry.width() + 1) * (appcount + 1);
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result.add(new MediaSnippet(ContentDomain.IMAGE, url, MimeTable.url2mime(url), desc, ientry.fileSize(), ientry.width(), ientry.height(), ranking, source));
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}
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return result;
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}
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/*
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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 (isEmpty()) {
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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 (isEmpty()) {
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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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