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ListHandler.java
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ListHandler.java
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/**
* Copyright (C) 2019 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.OwlapiAdapter;
import cz.cvut.kbss.ontodriver.owlapi.connector.OntologySnapshot;
import cz.cvut.kbss.ontodriver.descriptor.*;
import cz.cvut.kbss.ontodriver.model.Axiom;
import cz.cvut.kbss.ontodriver.model.NamedResource;
import org.semanticweb.owlapi.model.OWLOntology;
import org.semanticweb.owlapi.model.OWLOntologyChange;
import java.util.ArrayList;
import java.util.List;
public abstract class ListHandler<D extends ListDescriptor, V extends ListValueDescriptor> {
protected final OwlapiAdapter owlapiAdapter;
protected final AxiomAdapter axiomAdapter;
protected final OWLOntology ontology;
protected final OntologySnapshot snapshot;
protected ListHandler(OwlapiAdapter owlapiAdapter, OntologySnapshot snapshot) {
this.owlapiAdapter = owlapiAdapter;
this.axiomAdapter = new AxiomAdapter(snapshot.getDataFactory());
this.snapshot = snapshot;
this.ontology = snapshot.getOntology();
}
public List<Axiom<NamedResource>> loadList(D descriptor) {
final List<Axiom<NamedResource>> list = new ArrayList<>();
final OwlapiListIterator iterator = iterator(descriptor);
while (iterator.hasNext()) {
list.add(iterator.next());
}
return list;
}
public void persistList(V descriptor) {
if (descriptor.getValues().isEmpty()) {
return;
}
owlapiAdapter.addTransactionalChanges(snapshot.applyChanges(createListAxioms(descriptor)));
}
abstract OwlapiListIterator iterator(ListDescriptor descriptor);
abstract List<OWLOntologyChange> createListAxioms(V descriptor);
public void updateList(V descriptor) {
if (descriptor.getValues().isEmpty()) {
removeObsoleteNodes(iterator(descriptor));
} else if (isOrigEmpty(descriptor)) {
persistList(descriptor);
} else {
mergeLists(descriptor);
}
}
abstract boolean isOrigEmpty(V descriptor);
private void mergeLists(V descriptor) {
final OwlapiListIterator it = iterator(descriptor);
final List<NamedResource> values = descriptor.getValues();
final List<OWLOntologyChange> changes = new ArrayList<>(values.size());
int i = 0;
NamedResource lastNode = null;
while (it.hasNext() && i < values.size()) {
final NamedResource newValue = values.get(i);
final NamedResource currentValue = it.nextValue();
if (!newValue.equals(currentValue)) {
changes.addAll(snapshot.applyChanges(it.replaceNode(newValue)));
}
lastNode = it.getCurrentNode();
i++;
}
owlapiAdapter.addTransactionalChanges(changes);
assert lastNode != null;
removeObsoleteNodes(it);
addNewNodes(descriptor, i, lastNode);
}
private void removeObsoleteNodes(OwlapiListIterator iterator) {
if (!iterator.hasNext()) {
return;
}
final List<OWLOntologyChange> changes = new ArrayList<>();
while (iterator.hasNext()) {
iterator.next();
changes.addAll(iterator.removeWithoutReconnect());
}
owlapiAdapter.addTransactionalChanges(snapshot.applyChanges(changes));
}
abstract void addNewNodes(V descriptor, int index, NamedResource lastNode);
public static ListHandler<SimpleListDescriptor, SimpleListValueDescriptor> getSimpleListHandler(
OwlapiAdapter adapter, OntologySnapshot snapshot) {
return new SimpleListHandler(adapter, snapshot);
}
public static ListHandler<ReferencedListDescriptor, ReferencedListValueDescriptor> getReferencedListHandler(
OwlapiAdapter adapter, OntologySnapshot snapshot) {
return new ReferencedListHandler(adapter, snapshot);
}
}