001/**
002 * Copyright (C) 2007 - 2016, 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.properties;
020
021import org.dllearner.core.ComponentAnn;
022import org.dllearner.kb.SparqlEndpointKS;
023import org.semanticweb.owlapi.model.AxiomType;
024import org.semanticweb.owlapi.model.OWLObjectProperty;
025import org.semanticweb.owlapi.model.OWLReflexiveObjectPropertyAxiom;
026
027import org.apache.jena.query.ParameterizedSparqlString;
028
029@ComponentAnn(name = "reflexive object property axiom learner", shortName = "oplrefl", version = 0.1, description="A learning algorithm for reflexive object property domain axioms.")
030public class ReflexiveObjectPropertyAxiomLearner extends ObjectPropertyCharacteristicsAxiomLearner<OWLReflexiveObjectPropertyAxiom> {
031
032        public ReflexiveObjectPropertyAxiomLearner(SparqlEndpointKS ks) {
033                super(ks);
034                
035                super.posExamplesQueryTemplate = new ParameterizedSparqlString(
036                                "SELECT ?s WHERE {?s ?p ?s .}");
037                super.negExamplesQueryTemplate = new ParameterizedSparqlString(
038                                "SELECT ?s WHERE {?s ?p ?o . FILTER NOT EXISTS{?s ?p ?s .}");
039                
040                super.POS_FREQUENCY_QUERY = new ParameterizedSparqlString(
041                                        "SELECT (COUNT(?s) AS ?cnt) WHERE {?s ?p ?s .}");
042                
043                COUNT_QUERY = DISTINCT_SUBJECTS_COUNT_QUERY;
044                
045                axiomType = AxiomType.REFLEXIVE_OBJECT_PROPERTY;
046
047        }
048
049        /* (non-Javadoc)
050         * @see org.dllearner.algorithms.properties.ObjectPropertyCharacteristicsAxiomLearner#getAxiom(org.semanticweb.owlapi.model.OWLObjectProperty)
051         */
052        @Override
053        protected OWLReflexiveObjectPropertyAxiom getAxiom(OWLObjectProperty property) {
054                return df.getOWLReflexiveObjectPropertyAxiom(property);
055        }
056        
057        
058}