how to get range class of objectProperty by its domain class in owlapi?

Question

In my project, I'd like to get all the range class related to the given class by an restricted(somevaluefrom or allvalues from) objectproperties. I can get the restricted subclassofAxioms expressions including the given class, but how can I get the range class in these expressions? In other word, how can I get all the related classes to the given class excluding inherited subclass.

For example:

public static void printSubClassOfAxioms(OWLOntology ontology,OWLReasoner reasoner,OWLClass owlClass){  

  for(OWLSubClassOfAxiom ax:ontology.getSubClassAxiomsForSubClass(owlClass)){
        OWLClassExpression expression=ax.getSuperClass();
        System.out.println(ax);
         System.out.println(expression);
    }
 }

The results are:

SubClassOf(<#FourCheesesTopping> <#CheeseTopping>)  
SubClassOf(<#FourCheesesTopping> ObjectSomeValuesFrom(<#hasSpiciness> <#Mild>))  
SubClassOf(<#FourCheesesTopping> ObjectAllValuesFrom(<#hasCountryOfOrigin> #Country>))  

How can I just get the range classes #Country and #Mild

Thank you for your attention!

Answer 1

Write an OWLObjectVisitor and override the visit(OWL... Type) for the restrictions you're interested in. At that point,

type.getFiller()

will yield the class you're after.

Examples are in the documentation: https://github.com/owlcs/owlapi/wiki/Documentation

public class RestrictionVisitor extends OWLClassExpressionVisitor {
    @Override
    public void visit(@Nonnull OWLObjectSomeValuesFrom ce) {
        // This method gets called when a class expression is an existential
        // (someValuesFrom) restriction and it asks us to visit it
    }
}