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.kb.sparql.simple;
020
021import java.util.HashSet;
022import java.util.List;
023import java.util.Set;
024
025import org.slf4j.Logger;
026import org.slf4j.LoggerFactory;
027
028import org.apache.jena.ontology.OntModel;
029import org.apache.jena.rdf.model.ModelFactory;
030import com.jamonapi.Monitor;
031import com.jamonapi.MonitorFactory;
032
033public class SchemaIndexer {
034    private static Logger log = LoggerFactory.getLogger(SchemaIndexer.class);
035    private OntModel model;
036
037    //static instantiation
038    private static ClassIndexer classIndexer = new ClassIndexer();
039    //remember ontologies
040    private static Set<String> alreadyIndexed = new HashSet<>();
041    //set or list of urls for the ontologies
042    private List<String> ontologySchemaUrls;
043
044    public SchemaIndexer() {
045    }
046
047    public synchronized void init() {
048
049        for (String url : ontologySchemaUrls) {
050            log.info("Testing, if indexed: " + url);
051            if (alreadyIndexed.add(url)) {
052                log.info("Ontology not found, start indexing");
053                try {
054                    Monitor m0 = MonitorFactory.start("Indexer parsing ontology");
055                    model = ModelFactory.createOntologyModel();
056                    model.read(url, null);
057                    classIndexer.index(model);
058                    m0.stop();
059                    log.info("indexed ontology in ms: " + m0.getTotal());
060                } catch (Exception e) {
061                    log.error(e.getMessage(), e);
062                }
063            } else {
064                //not so important output
065                log.debug("Already indexed: " + url + " " + alreadyIndexed);
066            }
067        }
068
069    }
070
071    public OntModel getHierarchyForURI(String classUri) {
072        if (classIndexer == null) {
073            this.init();
074        }
075        return classIndexer.getHierarchyForClassURI(classUri);
076    }
077
078    public static void main(String... args) {
079        SchemaIndexer i = new SchemaIndexer();
080        System.out.println(i.getHierarchyForURI("http://dbpedia.org/ontology/Software"));
081    }
082
083    public void setOntologySchemaUrls(List<String> ontologySchemaUrls) {
084        this.ontologySchemaUrls = ontologySchemaUrls;
085    }
086}