001/**
002 * Copyright (C) 2007-2013, Jens Lehmann
003 *
004 * This file is part of DL-Learner.
005 *
006 * DL-Learner is free software; you can redistribute it and/or modify
007 * it under the terms of the GNU General Public License as published by
008 * the Free Software Foundation; either version 3 of the License, or
009 * (at your option) any later version.
010 *
011 * DL-Learner is distributed in the hope that it will be useful,
012 * but WITHOUT ANY WARRANTY; without even the implied warranty of
013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
014 * GNU General Public License for more details.
015 *
016 * You should have received a copy of the GNU General Public License
017 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
018 */
019package org.dllearner.algorithms.isle.wsd;
020
021import java.util.Random;
022import java.util.Set;
023
024import org.dllearner.algorithms.isle.index.Annotation;
025import org.dllearner.algorithms.isle.index.EntityScorePair;
026import org.dllearner.algorithms.isle.index.SemanticAnnotation;
027import org.semanticweb.owlapi.model.OWLEntity;
028import org.semanticweb.owlapi.model.OWLOntology;
029
030/**
031 * Disambiguation by randomly selecting one of the candidates (baseline method).
032 * 
033 * @author Jens Lehmann
034 *
035 */
036public class RandomWordSenseDisambiguation extends WordSenseDisambiguation {
037
038        private Random random;
039        
040        public RandomWordSenseDisambiguation(OWLOntology ontology) {
041                super(ontology);
042                random = new Random();
043        }
044
045        @Override
046        public SemanticAnnotation disambiguate(Annotation annotation,
047                        Set<EntityScorePair> candidateEntities) {
048                int pos = random.nextInt(candidateEntities.size());
049                int i = 0;
050                for(EntityScorePair esp : candidateEntities) {
051            OWLEntity e = esp.getEntity();
052            if (i == pos) {
053                return new SemanticAnnotation(annotation, e);
054            }
055            i++;
056        }
057        return null;
058        }
059
060}