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InferredReferencedListIterator.java
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InferredReferencedListIterator.java
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/**
* Copyright (C) 2020 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.descriptor.ReferencedListDescriptor;
import cz.cvut.kbss.ontodriver.model.NamedResource;
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.owlapi.util.OwlapiUtils;
import org.semanticweb.owlapi.model.OWLIndividual;
import org.semanticweb.owlapi.model.OWLNamedIndividual;
import org.semanticweb.owlapi.model.OWLOntologyChange;
import org.semanticweb.owlapi.reasoner.OWLReasoner;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.stream.Collectors;
class InferredReferencedListIterator extends ReferencedListIterator {
private OWLNamedIndividual currentNode;
private final OWLReasoner reasoner;
InferredReferencedListIterator(ReferencedListDescriptor descriptor, OntologySnapshot snapshot,
AxiomAdapter axiomAdapter) {
super(descriptor, snapshot, axiomAdapter);
this.reasoner = snapshot.getReasoner();
if (reasoner == null) {
throw new ReasonerNotAvailableException();
}
this.currentNode = OwlapiUtils.getIndividual(descriptor.getListOwner(), snapshot.getDataFactory());
}
@Override
public boolean hasNext() {
if (nextItem == null) {
doStep();
}
return nextItem != null && !nextItem.isEmpty();
}
@Override
void doStep() {
final Collection<OWLNamedIndividual> nextNodes =
reasoner.getObjectPropertyValues(currentNode, currentNextNodeProperty).entities()
.collect(Collectors.toSet());
if (nextNodes.isEmpty()) {
this.nextItem = Collections.emptyList();
return;
}
checkMaxSuccessors(currentNextNodeProperty, nextNodes);
this.currentNextNodeProperty = hasNextProperty;
this.currentNode = nextNodes.iterator().next();
this.nextItem = reasoner.getObjectPropertyValues(currentNode, hasContentProperty).entities()
.collect(Collectors.toSet());
}
@Override
NamedResource nextValue() {
if (!hasNext()) {
throw new NoSuchElementException("There are no more elements.");
}
checkMaxSuccessors(hasContentProperty, nextItem);
final OWLIndividual value = nextItem.iterator().next();
checkIsNamed(value);
doStep();
return NamedResource.create(value.asOWLNamedIndividual().getIRI().toURI());
}
@Override
List<OWLOntologyChange> removeWithoutReconnect() {
throw new UnsupportedOperationException();
}
@Override
List<OWLOntologyChange> replaceNode(NamedResource newValue) {
throw new UnsupportedOperationException();
}
}