/**
* Serializes a batch of triples corresponding to a predicate into one file. Upper bound:
* TRIPLE_LIMIT_PER_FILE.
*/
private static int serializeTripleBatch(
OWLOntology ontology,
QuestOWLIndividualAxiomIterator iterator,
String filePrefix,
String predicateName,
int fileCount,
String format)
throws Exception {
String fileName = filePrefix + fileCount + ".owl";
OWLOntologyManager manager = OWLManager.createOWLOntologyManager();
// Main buffer
OWLOntology aBox = manager.createOntology(IRI.create(predicateName));
// Add the signatures
for (OWLDeclarationAxiom axiom : ontology.getAxioms(AxiomType.DECLARATION)) {
manager.addAxiom(aBox, axiom);
}
int tripleCount = 0;
while (iterator.hasNext() && (tripleCount < TRIPLE_LIMIT_PER_FILE)) {
manager.addAxiom(aBox, iterator.next());
tripleCount++;
}
// BufferedOutputStream output = new BufferedOutputStream(new
// FileOutputStream(outputPath.toFile()));
// BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(output, "UTF-8"));
BufferedWriter writer = new BufferedWriter(new FileWriter(fileName));
manager.saveOntology(aBox, getOntologyFormat(format), new WriterDocumentTarget(writer));
return tripleCount;
}
public void runWithSingleFile() {
BufferedOutputStream output = null;
BufferedWriter writer = null;
try {
final long startTime = System.currentTimeMillis();
if (outputFile != null) {
output = new BufferedOutputStream(new FileOutputStream(outputFile));
} else {
output = new BufferedOutputStream(System.out);
}
writer = new BufferedWriter(new OutputStreamWriter(output, "UTF-8"));
OBDAModel obdaModel = loadMappingFile(mappingFile);
OWLOntology ontology = null;
OWLOntologyManager manager = OWLManager.createOWLOntologyManager();
OWLAPI3Materializer materializer = null;
if (owlFile != null) {
// Loading the OWL ontology from the file as with normal OWLReasoners
ontology = manager.loadOntologyFromOntologyDocument((new File(owlFile)));
if (disableReasoning) {
/*
* when reasoning is disabled, we extract only the declaration assertions for the vocabulary
*/
ontology = extractDeclarations(manager, ontology);
}
Ontology onto = OWLAPI3TranslatorUtility.translate(ontology);
obdaModel.declareAll(onto.getVocabulary());
materializer = new OWLAPI3Materializer(obdaModel, onto, DO_STREAM_RESULTS);
} else {
ontology = manager.createOntology();
materializer = new OWLAPI3Materializer(obdaModel, DO_STREAM_RESULTS);
}
// OBDAModelSynchronizer.declarePredicates(ontology, obdaModel);
QuestOWLIndividualAxiomIterator iterator = materializer.getIterator();
while (iterator.hasNext()) manager.addAxiom(ontology, iterator.next());
OWLOntologyFormat ontologyFormat = getOntologyFormat(format);
manager.saveOntology(ontology, ontologyFormat, new WriterDocumentTarget(writer));
System.err.println("NR of TRIPLES: " + materializer.getTriplesCount());
System.err.println("VOCABULARY SIZE (NR of QUERIES): " + materializer.getVocabularySize());
materializer.disconnect();
if (outputFile != null) output.close();
final long endTime = System.currentTimeMillis();
final long time = endTime - startTime;
System.out.println("Elapsed time to materialize: " + time + " {ms}");
} catch (Exception e) {
System.out.println("Error materializing ontology:");
e.printStackTrace();
}
}