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package rsacomb
import org.semanticweb.owlapi.model.{
OWLSubObjectPropertyOfAxiom,
OWLSubClassOfAxiom,
OWLObjectProperty,
OWLObjectPropertyExpression
}
import tech.oxfordsemantic.jrdfox.logic.{IRI, Atom, Rule, Term, Variable}
object ProgramGenerator {
def apply(
term: Term,
unsafe: List[OWLObjectPropertyExpression] = List()
): RDFoxAxiomConverter =
new ProgramGenerator(term, unsafe)
def generateRoleRules(
roles: List[OWLObjectPropertyExpression]
): List[Rule] = {
def additional(pred: String): Seq[Rule] = {
val varX = Variable.create("X")
val varY = Variable.create("Y")
Seq(
Rule.create(
Atom.rdf(varX, IRI.create(pred), varY),
Atom.rdf(varX, IRI.create(pred ++ "_f"), varY)
),
Rule.create(
Atom.rdf(varX, IRI.create(pred), varY),
Atom.rdf(varX, IRI.create(pred ++ "_b"), varY)
),
Rule.create(
Atom.rdf(varY, IRI.create(pred ++ "_b" ++ "_inv"), varX),
Atom.rdf(varX, IRI.create(pred ++ "_f"), varY)
),
Rule.create(
Atom.rdf(varY, IRI.create(pred ++ "_f" ++ "_inv"), varX),
Atom.rdf(varX, IRI.create(pred ++ "_b"), varY)
)
)
}
roles
.filter(_.isInstanceOf[OWLObjectProperty]) // Can we avoid this?
.map(_.asInstanceOf[OWLObjectProperty].getIRI.getIRIString)
.flatMap(additional)
}
}
class ProgramGenerator(
term: Term,
unsafe: List[OWLObjectPropertyExpression]
) extends RDFoxAxiomConverter(term, SkolemStrategy.None, unsafe)
with RSAAxiom {
override def visit(axiom: OWLSubClassOfAxiom): List[Rule] = {
if (axiom.isT5) {
// TODO: get role in T5 axiom
// Assuming one role here
val role = axiom.objectPropertyExpressionsInSignature(0)
if (unsafe.contains(role)) {
val visitor =
new RDFoxAxiomConverter(
term,
SkolemStrategy.Standard(axiom.toString),
unsafe
)
axiom.accept(visitor)
} else {
// TODO; Handle forks
}
} else {
// Fallback to standard OWL to LP translation
super.visit(axiom)
}
List()
}
override def visit(axiom: OWLSubObjectPropertyOfAxiom): List[Rule] = {
// TODO: Generate additional rules for role inclusion
val additional = List()
super.visit(axiom) ++ additional
}
}
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