I'm new in the semantic web field and I'm trying to compare more reasoners. This is my code:
OWLOntologyManager manager = OWLManager.createOWLOntologyManager();
File file = new File(args[0]);
OWLOntology ontology = manager.loadOntologyFromOntologyDocument(file);
Set<OWLClass> classes = ontology.getClassesInSignature();
String inferredFile = args[1];
//test for correctly uploading ontology
OWLDataFactory df = manager.getOWLDataFactory();
Reasoner jfact = Reasoner.JFACT;
System.out.println(RunReasoner(jfact, df,ontology,manager,inferredFile));
}
//CREATE AN ENUM REASONER
public enum Reasoner{
HERMIT,
PELLET,
KONCLUDE,
JFACT,
FACT,
ELK
}
public static String RunReasoner(Reasoner reasoner, OWLDataFactory df, OWLOntology ontology, OWLOntologyManager manager, String inferredFile) throws OWLOntologyCreationException, FileNotFoundException, IOException, OWLOntologyStorageException {
String esito = "";
OWLReasoner reasoner_object = null;
if(reasoner == Reasoner.HERMIT) {
/****************HERMIT****************************************************************************************/
OWLReasonerFactory rf = new ReasonerFactory();
TimedConsoleProgressMonitor progressMonitor = new TimedConsoleProgressMonitor();
Configuration configuration = new Configuration();
configuration.reasonerProgressMonitor = progressMonitor;
configuration.ignoreUnsupportedDatatypes = true;
reasoner_object = rf.createReasoner(ontology, configuration);
}
else if(reasoner == Reasoner.KONCLUDE) {
// configure the server end-point
URL url = new URL("http://localhost:8080");
OWLlinkHTTPXMLReasonerFactory factory = new OWLlinkHTTPXMLReasonerFactory();
TimedConsoleProgressMonitor progressMonitor = new TimedConsoleProgressMonitor();
//OWLlinkReasonerConfiguration conf = (OWLlinkReasonerConfiguration) new SimpleConfiguration(progressMonitor);
reasoner_object = factory.createNonBufferingReasoner(ontology);
}
else if(reasoner == Reasoner.JFACT) {
TimedConsoleProgressMonitor progressMonitor = new TimedConsoleProgressMonitor();
OWLReasonerConfiguration conf = new SimpleConfiguration(progressMonitor);
JFactFactory factory = new JFactFactory();
reasoner_object = factory.createNonBufferingReasoner(ontology,conf);
}
// else if(reasoner == Reasoner.FACT) {
// TimedConsoleProgressMonitor progressMonitor = new TimedConsoleProgressMonitor();
// OWLReasonerConfiguration conf = new SimpleConfiguration(progressMonitor);
// FaCTPlusPlusReasonerFactory factory = new FaCTPlusPlusReasonerFactory();
// reasoner_object = factory.createNonBufferingReasoner(ontology,conf);
// }
else if(reasoner == Reasoner.ELK) {
TimedConsoleProgressMonitor progressMonitor = new TimedConsoleProgressMonitor();
OWLReasonerConfiguration conf = new SimpleConfiguration(progressMonitor);
ElkReasonerFactory factory = new ElkReasonerFactory();
reasoner_object = factory.createNonBufferingReasoner(ontology,conf);
}
else if(reasoner == Reasoner.PELLET) {
TimedConsoleProgressMonitor progressMonitor = new TimedConsoleProgressMonitor();
OWLReasonerConfiguration conf = new SimpleConfiguration(progressMonitor);
reasoner_object = OpenlletReasonerFactory.getInstance().createReasoner(ontology,conf);
}
else{
esito = "Reasoner non valido";
}
boolean consistencyCheck = reasoner_object.isConsistent();
if (consistencyCheck) {
reasoner_object.precomputeInferences(InferenceType.CLASS_HIERARCHY,
InferenceType.CLASS_ASSERTIONS, InferenceType.OBJECT_PROPERTY_HIERARCHY,
InferenceType.DATA_PROPERTY_HIERARCHY, InferenceType.OBJECT_PROPERTY_ASSERTIONS);
List<InferredAxiomGenerator<? extends OWLAxiom>> generators = new ArrayList<>();
generators.add(new InferredSubClassAxiomGenerator());
generators.add(new InferredClassAssertionAxiomGenerator());
generators.add(new InferredDataPropertyCharacteristicAxiomGenerator());
generators.add(new InferredEquivalentClassAxiomGenerator());
generators.add(new InferredEquivalentDataPropertiesAxiomGenerator());
generators.add(new InferredEquivalentObjectPropertyAxiomGenerator());
generators.add(new InferredInverseObjectPropertiesAxiomGenerator());
generators.add(new InferredObjectPropertyCharacteristicAxiomGenerator());
// NOTE: InferredPropertyAssertionGenerator significantly slows down
// inference computation
generators.add(new org.semanticweb.owlapi.util.InferredPropertyAssertionGenerator());
generators.add(new InferredSubClassAxiomGenerator());
generators.add(new InferredSubDataPropertyAxiomGenerator());
generators.add(new InferredSubObjectPropertyAxiomGenerator());
List<InferredIndividualAxiomGenerator<? extends OWLIndividualAxiom>> individualAxioms =
new ArrayList<>();
generators.addAll(individualAxioms);
generators.add(new InferredDisjointClassesAxiomGenerator());
InferredOntologyGenerator iog = new InferredOntologyGenerator(reasoner_object, generators); //Generates an ontology based on inferred axioms which are essentially supplied by a reasoner
OWLOntology inferredAxiomsOntology = manager.createOntology();
iog.fillOntology(df, inferredAxiomsOntology);
System.out.println(inferredAxiomsOntology.getAxiomCount());
// for(InferredAxiomGenerator<?> i : iog.getAxiomGenerators()) {
// System.out.println(i);}
File inferredOntologyFile = new File(inferredFile);
// Now we create a stream since the ontology manager can then write to that stream.
try (OutputStream outputStream = new FileOutputStream(inferredOntologyFile)) {
// We use the same format as for the input ontology.
manager.saveOntology(inferredAxiomsOntology, outputStream);
}
esito = "done "+ reasoner.toString();
reasoner_object.dispose();
} // End if consistencyCheck
else {
esito = reasoner.toString() +" -- Inconsistent input Ontology, Please check the OWL File";
}
return esito;
}
When I try to run it on a little ontology (40 axioms), my code works perfectly. If instead, I try to run it on a slightly larger ontology (750 axioms), the code continues to go on for hours but never reaches the actual realization. In fact, the inferred axioms file remains empty. I think it’s due to memory overload or some hidden buffer. I hope you can help me solve this problem. Thanks, Rita
