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InferredSimpleListIterator.java
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InferredSimpleListIterator.java
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/**
* Copyright (C) 2016 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.ontodriver.owlapi.list;
import cz.cvut.kbss.ontodriver.owlapi.AxiomAdapter;
import cz.cvut.kbss.ontodriver.owlapi.connector.OntologySnapshot;
import cz.cvut.kbss.ontodriver.owlapi.exception.ReasonerNotAvailableException;
import cz.cvut.kbss.ontodriver.descriptor.ListDescriptor;
import cz.cvut.kbss.ontodriver.model.Assertion;
import cz.cvut.kbss.ontodriver.model.Axiom;
import cz.cvut.kbss.ontodriver.model.NamedResource;
import org.semanticweb.owlapi.model.OWLIndividual;
import org.semanticweb.owlapi.model.OWLNamedIndividual;
import org.semanticweb.owlapi.model.OWLOntologyChange;
import org.semanticweb.owlapi.reasoner.NodeSet;
import org.semanticweb.owlapi.reasoner.OWLReasoner;
import java.util.Collections;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.stream.Collectors;
/**
* This class differs from the way basic SimpleListIterator iterates over the list. Here, we do step before even calling
* next in order to avoid consulting the reasoner twice for values of the current node's successors.
* <p>
* We can do this because we need not worry about remove operations, they're not supported on inferred iterator.
* <p>
* TODO Check if the inferred iterators' logic is correct, especially for the nextValue method
*/
class InferredSimpleListIterator extends SimpleListIterator {
private final OWLReasoner reasoner;
InferredSimpleListIterator(ListDescriptor descriptor, OntologySnapshot snapshot,
AxiomAdapter axiomAdapter) {
super(descriptor, snapshot, axiomAdapter);
if (snapshot.getReasoner() == null) {
throw new ReasonerNotAvailableException();
}
this.reasoner = snapshot.getReasoner();
}
@Override
public boolean hasNext() {
if (next == null) {
doStep();
}
return !next.isEmpty();
}
@Override
void doStep() {
final NodeSet<OWLNamedIndividual> nodeSet = reasoner.getObjectPropertyValues(currentNode, currentProperty);
this.next = nodeSet.isEmpty() ? Collections.emptySet() : nodeSet.entities().collect(Collectors.toSet());
this.previousProperty = currentProperty;
this.currentProperty = hasNextProperty;
this.previousNode = this.currentNode;
}
@Override
public Axiom<NamedResource> next() {
if (!hasNext()) {
throw new NoSuchElementException("There are no more elements.");
}
checkMaxSuccessors(previousProperty, next);
final OWLIndividual item = next.iterator().next(); // We know the individual is named
this.currentNode = item.asOWLNamedIndividual();
final NamedResource subject = NamedResource.create(previousNode.getIRI().toURI());
final NamedResource value = NamedResource.create(currentNode.getIRI().toURI());
final Assertion assertion = Assertion.createObjectPropertyAssertion(previousProperty.getIRI().toURI(), false);
doStep();
return axiomAdapter.createAxiom(subject, assertion, value);
}
@Override
List<OWLOntologyChange> removeWithoutReconnect() {
throw new UnsupportedOperationException();
}
@Override
List<OWLOntologyChange> replaceNode(NamedResource newValue) {
throw new UnsupportedOperationException();
}
}