Using OWL API, given an OWLClass, how can I get <rdfs:label> of it?

Question

Using OWL API 3.4.9.

Given an OWLClass and on ontology, how can I get <rdfs:label> of that OWLClass in that ontology?

I hope to get the label in the type of String.

Answer 1

Inspired from the guide to the OWL-API, the following code should work (not tested):

//Initialise
OWLOntologyManager m = create();
OWLOntology o = m.loadOntologyFromOntologyDocument(pizza_iri);
OWLDataFactory df = OWLManager.getOWLDataFactory();

//Get your class of interest
OWLClass cls = df.getOWLClass(IRI.create(pizza_iri + "#foo"));

// Get the annotations on the class that use the label property (rdfs:label)
for (OWLAnnotation annotation : cls.getAnnotations(o, df.getRDFSLabel())) {
  if (annotation.getValue() instanceof OWLLiteral) {
    OWLLiteral val = (OWLLiteral) annotation.getValue();
    // look for portuguese labels - can be skipped
      if (val.hasLang("pt")) {
        //Get your String here
        System.out.println(cls + " labelled " + val.getLiteral());
      }
   }
}