org.semanticweb.owlapi.AddClassExpressionClosureAxiom Maven / Gradle / Ivy
/*
* This file is part of the OWL API.
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* Copyright (C) 2011, The University of Manchester
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* in which case, the provisions of the Apache License Version 2.0 are applicable instead of those above.
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* Copyright 2011, The University of Manchester
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* Licensed under the Apache License, Version 2.0 (the "License");
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package org.semanticweb.owlapi;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.semanticweb.owlapi.model.AddAxiom;
import org.semanticweb.owlapi.model.OWLClass;
import org.semanticweb.owlapi.model.OWLClassExpression;
import org.semanticweb.owlapi.model.OWLDataFactory;
import org.semanticweb.owlapi.model.OWLObjectHasValue;
import org.semanticweb.owlapi.model.OWLObjectPropertyExpression;
import org.semanticweb.owlapi.model.OWLObjectSomeValuesFrom;
import org.semanticweb.owlapi.model.OWLOntology;
import org.semanticweb.owlapi.model.OWLOntologyChange;
import org.semanticweb.owlapi.model.OWLSubClassOfAxiom;
import org.semanticweb.owlapi.util.CollectionFactory;
import org.semanticweb.owlapi.util.OWLClassExpressionVisitorAdapter;
/** Author: Matthew Horridge
* The University Of Manchester
* Bio-Health Informatics Group
* Date: 24-Jul-2007
*
*
* This composite change adds a 'closure' axiom to an ontology for a given class
* and object property. In this case, a closure axiom is defined for a given
* class, A, and object property, P, to be a subclass axiom, whose subclass is
* class A, and whose superclass is a universal restriction along the property,
* P, whose filler is the union of any other existential (including hasValue
* restrictions - i.e. nominals) restriction fillers that are the superclasses
* of class A.
*
* This code is based on the tutorial examples by Sean Bechhofer (see the
* tutorial module). */
public class AddClassExpressionClosureAxiom extends AbstractCompositeOntologyChange {
private final OWLClass cls;
protected final OWLObjectPropertyExpression property;
private final Set ontologies;
private final OWLOntology targetOntology;
private final List changes = new ArrayList();
/** Creates a composite change that will add a closure axiom for a given
* class along a specified property.
*
* @param dataFactory
* The data factory that should be used to create the necessary
* objects
* @param cls
* The class for which the closure axiom will be generated
* @param property
* The property that the closure axiom will act along
* @param ontologies
* The ontologies that will be examined for subclass axioms
* @param targetOntology
* The target ontology that changes will be applied to. */
public AddClassExpressionClosureAxiom(OWLDataFactory dataFactory, OWLClass cls,
OWLObjectPropertyExpression property, Set ontologies,
OWLOntology targetOntology) {
super(dataFactory);
this.cls = cls;
this.property = property;
this.ontologies = ontologies;
this.targetOntology = targetOntology;
generateChanges();
}
private void generateChanges() {
changes.clear();
// We collect all of the fillers for existential restrictions along
// the target property and all of the fillers for hasValue restrictions
// as nominals
FillerCollector collector = new FillerCollector();
for (OWLOntology ont : ontologies) {
for (OWLSubClassOfAxiom ax : ont.getSubClassAxiomsForSubClass(cls)) {
ax.getSuperClass().accept(collector);
}
}
Set fillers = collector.getFillers();
if (fillers.isEmpty()) {
return;
}
OWLClassExpression closureAxiomFiller = getDataFactory().getOWLObjectUnionOf(
fillers);
OWLClassExpression closureAxiomDesc = getDataFactory().getOWLObjectAllValuesFrom(
property, closureAxiomFiller);
changes.add(new AddAxiom(targetOntology, getDataFactory().getOWLSubClassOfAxiom(
cls, closureAxiomDesc)));
}
@Override
public List getChanges() {
return changes;
}
private class FillerCollector extends OWLClassExpressionVisitorAdapter {
private Set fillers;
public FillerCollector() {
fillers = new HashSet();
}
public Set getFillers() {
return fillers;
}
@Override
public void visit(OWLObjectSomeValuesFrom desc) {
if (desc.getProperty().equals(property)) {
fillers.add(desc.getFiller());
}
}
@Override
public void visit(OWLObjectHasValue desc) {
if (desc.getProperty().equals(property)) {
fillers.add(getDataFactory().getOWLObjectOneOf(
CollectionFactory.createSet(desc.getValue())));
}
}
}
}