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277 lines
12 KiB
277 lines
12 KiB
// plasmaSearchResult.java
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// -----------------------
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// part of YACY
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2005
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// Created: 10.10.2005
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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package de.anomic.plasma;
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import java.net.MalformedURLException;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.HashSet;
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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 de.anomic.htmlFilter.htmlFilterContentScraper;
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import de.anomic.plasma.plasmaURL;
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import de.anomic.index.indexURLEntry;
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import de.anomic.kelondro.kelondroMScoreCluster;
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import de.anomic.net.URL;
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import de.anomic.server.serverCodings;
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public final class plasmaSearchResult {
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private TreeMap pageAcc; // key = order hash; value = plasmaLURL.entry
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private kelondroMScoreCluster ref; // reference score computation for the commonSense heuristic
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private ArrayList results; // this is a buffer for plasmaWordIndexEntry + plasmaCrawlLURL.entry - objects
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private plasmaSearchQuery query;
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private plasmaSearchRankingProfile ranking;
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public int globalContributions;
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public int localContributions;
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public int filteredResults;
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public plasmaSearchResult(plasmaSearchQuery query, plasmaSearchRankingProfile ranking) {
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this.pageAcc = new TreeMap();
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this.ref = new kelondroMScoreCluster();
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this.results = new ArrayList();
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this.query = query;
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this.ranking = ranking;
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this.globalContributions = 0;
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this.localContributions = 0;
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this.filteredResults = 0;
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}
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public plasmaSearchResult cloneSmart() {
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// clones only the top structure
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plasmaSearchResult theClone = new plasmaSearchResult(this.query, this.ranking);
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theClone.pageAcc = (TreeMap) this.pageAcc.clone();
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theClone.ref = this.ref;
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theClone.results = this.results;
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return theClone;
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}
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public int sizeOrdered() {
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return pageAcc.size();
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}
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public int sizeFetched() {
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return results.size();
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}
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public boolean hasMoreElements() {
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return pageAcc.size() > 0;
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}
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public indexURLEntry nextElement() {
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Object top = pageAcc.firstKey();
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//System.out.println("postorder-key: " + ((String) top));
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return (indexURLEntry) pageAcc.remove(top);
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}
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protected void addResult(indexURLEntry page, Long preranking) {
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// take out relevant information for reference computation
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indexURLEntry.Components comp = page.comp();
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if ((comp.url() == null) || (comp.descr() == null)) return;
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String[] urlcomps = htmlFilterContentScraper.urlComps(comp.url().toNormalform()); // word components of the url
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String[] descrcomps = comp.descr().toLowerCase().split(htmlFilterContentScraper.splitrex); // words in the description
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// store everything
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results.add(new Object[] {page, urlcomps, descrcomps, preranking});
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// add references
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addScoreFiltered(urlcomps);
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addScoreFiltered(descrcomps);
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}
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protected void sortResults(boolean postsort) {
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// finally sort the results
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// create a commonSense - set that represents a set of words that is
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// treated as 'typical' for this search request
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Object[] references = getReferences(16);
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Set commonSense = new HashSet();
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for (int i = 0; i < references.length; i++) commonSense.add(references[i]);
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Object[] resultVector;
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indexURLEntry page;
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long ranking;
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for (int i = 0; i < results.size(); i++) {
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// take out values from result array
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resultVector = (Object[]) results.get(i);
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page = (indexURLEntry) resultVector[0];
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// calculate ranking
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if (postsort)
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ranking = this.ranking.postRanking(
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((Long) resultVector[3]).longValue(),
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query,
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commonSense,
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(String[]) resultVector[1],
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(String[]) resultVector[2],
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page
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);
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else
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ranking = ((Long) resultVector[3]).longValue();
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// insert value
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//System.out.println("Ranking " + ranking + ", YBR-" + plasmaSearchPreOrder.ybr(indexEntry.getUrlHash()) + " for URL " + page.url());
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pageAcc.put(serverCodings.encodeHex(Long.MAX_VALUE - ranking, 16) + page.hash(), page);
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}
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// flush memory
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results = null;
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}
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public void removeRedundant() {
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// remove all urls from the pageAcc structure that occur double by specific redundancy rules
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// a link is redundant, if a sub-path of the url is cited before. redundant urls are removed
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// we find redundant urls by iteration over all elements in pageAcc
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Iterator i = pageAcc.entrySet().iterator();
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HashMap paths = new HashMap(); // a url-subpath to pageAcc-key relation
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Map.Entry entry;
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// first scan all entries and find all urls that are referenced
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while (i.hasNext()) {
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entry = (Map.Entry) i.next();
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paths.put(((indexURLEntry) entry.getValue()).comp().url().toNormalform(), entry.getKey());
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//if (path != null) path = shortenPath(path);
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//if (path != null) paths.put(path, entry.getKey());
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}
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// now scan the pageAcc again and remove all redundant urls
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i = pageAcc.entrySet().iterator();
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String shorten;
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while (i.hasNext()) {
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entry = (Map.Entry) i.next();
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shorten = shortenPath(((indexURLEntry) entry.getValue()).comp().url().toNormalform());
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// scan all subpaths of the url
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while (shorten != null) {
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if (pageAcc.size() <= query.wantedResults) break;
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if (paths.containsKey(shorten)) {
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//System.out.println("deleting path from search result: " + path + " is redundant to " + shorten);
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try {
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i.remove();
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} catch (IllegalStateException e) {
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}
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}
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shorten = shortenPath(shorten);
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}
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}
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}
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private static String shortenPath(String path) {
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int pos = path.lastIndexOf('/');
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if (pos < 0) return null;
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return path.substring(0, pos);
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}
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/*
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private static String urlPath(URL url) {
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String port = ((url.getPort() < 0) ? "" : ":" + url.getPort());
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String path = url.getPath();
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if (path.endsWith("/")) path = path.substring(0, path.length() - 1);
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int pos = path.lastIndexOf('/');
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if ((pos >= 0) && (path.length() > pos + 5) && (path.substring(pos + 1).toLowerCase().startsWith("index"))) {
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path = path.substring(0, pos);
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}
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return url.getHost() + port + path;
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}
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*/
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public Object[] getReferences(int count) {
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// create a list of words that had been computed by statistics over all
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// words that appeared in the url or the description of all urls
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return ref.getScores(count, false, 2, Integer.MAX_VALUE);
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}
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public void addScoreFiltered(String[] words) {
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String word;
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for (int i = 0; i < words.length; i++) {
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word = words[i].toLowerCase();
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if ((word.length() > 2) &&
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("http_html_php_ftp_www_com_org_net_gov_edu_index_home_page_for_usage_the_and_".indexOf(word) < 0) &&
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(!(query.queryHashes.contains(plasmaCondenser.word2hash(word)))))
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ref.incScore(word);
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}
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}
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/*
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private void printSplitLog(String x, String[] y) {
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String s = "";
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for (int i = 0; i < y.length; i++) s = s + ", " + y[i];
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if (s.length() > 0) s = s.substring(2);
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System.out.println("Split '" + x + "' = {" + s + "}");
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}
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*/
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public static void main(String[] args) {
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URL[] urls = new URL[10];
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try {
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urls[0] = new URL("http://www.yacy.net");
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urls[1] = new URL("http://www.yacy.de/");
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urls[2] = new URL("http://yacy.net/");
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urls[3] = new URL("http://www.yacy.net:80/");
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urls[4] = new URL("http://yacy.net:80/");
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urls[5] = new URL("http://www.yacy.net/index.html");
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urls[6] = new URL("http://www.yacy.net/yacy");
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urls[7] = new URL("http://www.yacy.net/yacy/");
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urls[8] = new URL("http://www.yacy.net/yacy/index.html");
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urls[9] = new URL("ftp://www.yacy.net/yacy/index.html");
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String hash, fill;
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String[] paths1 = new String[urls.length]; for (int i = 0; i < urls.length; i++) {
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fill = ""; for (int j = 0; j < 35 - urls[i].toString().length(); j++) fill +=" ";
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paths1[i] = urls[i].toNormalform();
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hash = plasmaURL.urlHash(urls[i]);
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System.out.println("paths1[" + urls[i] + fill +"] = " + hash + ", typeID=" + plasmaURL.flagTypeID(hash) + ", tldID=" + plasmaURL.flagTLDID(hash) + ", lengthID=" + plasmaURL.flagLengthID(hash) + " / " + paths1[i]);
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}
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String[] paths2 = new String[urls.length]; for (int i = 0; i < urls.length; i++) {
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fill = ""; for (int j = 0; j < 35 - urls[i].toString().length(); j++) fill +=" ";
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paths2[i] = shortenPath(paths1[i]);
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hash = plasmaURL.urlHash(urls[i]);
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System.out.println("paths2[" + urls[i] + fill + "] = " + hash + ", typeID=" + plasmaURL.flagTypeID(hash) + ", tldID=" + plasmaURL.flagTLDID(hash) + ", lengthID=" + plasmaURL.flagLengthID(hash) + " / " + paths2[i]);
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}
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} catch (MalformedURLException e) {
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e.printStackTrace();
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}
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}
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} |