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/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership.
*/
package org.topbraid.jenax.util;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.jena.datatypes.xsd.impl.XMLLiteralType;
import org.apache.jena.rdf.model.Model;
import org.apache.jena.rdf.model.Resource;
import org.apache.jena.rdf.model.StmtIterator;
import org.apache.jena.util.FileUtils;
import org.apache.jena.vocabulary.OWL;
import org.apache.jena.vocabulary.RDF;
import org.apache.jena.vocabulary.RDFS;
import org.apache.jena.vocabulary.XSD;
/**
* Provides access to the RDF/RDFS/OWL system triples.
*
* TopBraid and this API adds some extra triples (such as declaring
* superclasses for each system class) that make life easier.
*
* @author Holger Knublauch
*/
public class SystemTriples {
private static Model vocabulary;
private static void ensureSuperClasses(Resource metaClass, Resource superClass) {
List toAdd = collectMissingSuperClasses(metaClass, superClass);
for (Resource c: toAdd) {
vocabulary.add(c, RDFS.subClassOf, superClass);
}
}
private static List collectMissingSuperClasses(Resource metaClass,
Resource superClass) {
List toAdd = new ArrayList();
StmtIterator it = vocabulary.listStatements(null, RDF.type, metaClass);
while (it.hasNext()) {
Resource c = it.nextStatement().getSubject();
if (!c.equals(superClass)) {
if (c.getProperty(RDFS.subClassOf) == null) {
toAdd.add(c);
}
}
}
return toAdd;
}
/**
* Gets the system ontology (a shared copy).
* @return the system ontology
*/
public static synchronized Model getVocabularyModel() {
if (vocabulary == null) {
vocabulary = JenaUtil.createDefaultModel();
org.topbraid.jenax.util.JenaUtil.initNamespaces(vocabulary.getGraph());
vocabulary.setNsPrefix("xsd", XSD.getURI());
InputStream ttl = SystemTriples.class.getResourceAsStream("/rdf/system-triples.ttl");
vocabulary.read(ttl, "urn:x:dummy", FileUtils.langTurtle);
ensureSuperClasses(RDFS.Class, RDFS.Resource);
ensureSuperClasses(OWL.Class, OWL.Thing);
// Remove owl imports rdfs which only causes trouble
vocabulary.removeAll(null, OWL.imports, null);
vocabulary.add(OWL.Thing, RDFS.subClassOf, RDFS.Resource);
vocabulary.add(OWL.inverseOf, RDF.type, OWL.SymmetricProperty);
vocabulary.add(OWL.equivalentClass, RDF.type, OWL.SymmetricProperty);
vocabulary.add(OWL.equivalentProperty, RDF.type, OWL.SymmetricProperty);
vocabulary.add(OWL.equivalentProperty, RDFS.range, RDF.Property);
vocabulary.add(OWL.differentFrom, RDF.type, OWL.SymmetricProperty);
vocabulary.add(OWL.sameAs, RDF.type, OWL.SymmetricProperty);
vocabulary.add(OWL.disjointWith, RDF.type, OWL.SymmetricProperty);
Resource xml = vocabulary.getResource(XMLLiteralType.theXMLLiteralType.getURI());
vocabulary.add(xml, RDFS.subClassOf, RDFS.Resource);
for(String uri : JenaDatatypes.getDatatypeURIs()) {
Resource r = vocabulary.getResource(uri);
if (r.getProperty(RDF.type) == null) {
vocabulary.add(r, RDF.type, RDFS.Datatype);
vocabulary.add(r, RDFS.subClassOf, RDFS.Literal);
}
}
vocabulary.add(RDF.HTML, RDFS.label, "HTML");
// Triples were formally in OWL 1, but dropped from OWL 2
vocabulary.add(RDFS.comment, RDF.type, OWL.AnnotationProperty);
vocabulary.add(RDFS.label, RDF.type, OWL.AnnotationProperty);
vocabulary.add(RDFS.isDefinedBy, RDF.type, OWL.AnnotationProperty);
vocabulary.add(RDFS.seeAlso, RDF.type, OWL.AnnotationProperty);
// Add rdfs:labels for XSD types
for(Resource datatype : vocabulary.listSubjectsWithProperty(RDF.type, RDFS.Datatype).toList()) {
datatype.addProperty(RDFS.label, datatype.getLocalName());
}
vocabulary = JenaUtil.asReadOnlyModel(vocabulary);
}
return vocabulary;
}
}
