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83 lines
3.2 KiB
83 lines
3.2 KiB
// suggestionsjava
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// -----------------------
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// (C) 2010 by Michael Peter Christen; mc@yacy.net
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// first published 11.10.2010 in Frankfurt, Germany on http://yacy.net
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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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import java.util.Iterator;
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import net.yacy.cora.protocol.RequestHeader;
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import de.anomic.data.DidYouMean;
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import de.anomic.search.Segment;
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import de.anomic.search.Segments;
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import de.anomic.search.Switchboard;
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import de.anomic.server.serverObjects;
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import de.anomic.server.serverSwitch;
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/**
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* implementation of the opensearch suggestion extension, see
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* http://www.opensearch.org/Specifications/OpenSearch/Extensions/Suggestions/1.1
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* or
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* https://wiki.mozilla.org/Search_Service/Suggestions
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*/
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public class suggest {
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private static final int meanMax = 30;
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public static serverObjects respond(final RequestHeader header, final serverObjects post, final serverSwitch env) {
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final Switchboard sb = (Switchboard) env;
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final serverObjects prop = new serverObjects();
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// get query
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String originalquerystring = (post == null) ? "" : post.get("query", post.get("q", "")).trim();
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String querystring = originalquerystring.replace('+', ' ');
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int timeout = (post == null) ? 300 : post.getInt("timeout", 300);
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int count = (post == null) ? 20 : post.getInt("count", 20);
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// get segment
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Segment indexSegment = null;
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if (post != null && post.containsKey("segment")) {
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String segmentName = post.get("segment");
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if (sb.indexSegments.segmentExist(segmentName)) {
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indexSegment = sb.indexSegments.segment(segmentName);
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}
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} else {
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// take default segment
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indexSegment = sb.indexSegments.segment(Segments.Process.PUBLIC);
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}
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DidYouMean didYouMean = new DidYouMean(indexSegment.termIndex(), querystring);
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Iterator<String> meanIt = didYouMean.getSuggestions(timeout, count).iterator();
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int meanCount = 0;
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String suggestion;
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StringBuilder suggestions = new StringBuilder(120);
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while (meanCount < meanMax && meanIt.hasNext()) {
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suggestion = meanIt.next();
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suggestions.append(',').append('"').append(suggestion).append('"');
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meanCount++;
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}
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prop.put("query", '"' + originalquerystring + '"');
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prop.put("suggestions", suggestions.length() > 0 ? suggestions.substring(1) : "");
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// return rewrite properties
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return prop;
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}
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}
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