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ListHandler.java
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ListHandler.java
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package cz.cvut.kbss.ontodriver.jena.list;
import cz.cvut.kbss.ontodriver.descriptor.ListDescriptor;
import cz.cvut.kbss.ontodriver.descriptor.ListValueDescriptor;
import cz.cvut.kbss.ontodriver.jena.connector.StorageConnector;
import cz.cvut.kbss.ontodriver.model.Axiom;
import cz.cvut.kbss.ontodriver.model.NamedResource;
import org.apache.jena.rdf.model.Resource;
import java.util.ArrayList;
import java.util.List;
import static org.apache.jena.rdf.model.ResourceFactory.createResource;
public abstract class ListHandler<D extends ListDescriptor, V extends ListValueDescriptor> {
final StorageConnector connector;
ListHandler(StorageConnector connector) {
this.connector = connector;
}
List<Axiom<NamedResource>> loadList(D descriptor) {
final List<Axiom<NamedResource>> result = new ArrayList<>();
final AbstractListIterator it = iterator(descriptor);
while (it.hasNext()) {
result.add(it.nextAxiom());
}
return result;
}
abstract AbstractListIterator iterator(D descriptor);
abstract AbstractListIterator iterator(V descriptor);
void persistList(V descriptor) {
final List<NamedResource> values = descriptor.getValues();
if (values.isEmpty()) {
return;
}
Resource owner = createResource(descriptor.getListOwner().getIdentifier().toString());
appendNewNodes(descriptor, 0, owner);
}
abstract void appendNewNodes(V descriptor, int index, Resource lastNode);
void updateList(V descriptor) {
final AbstractListIterator it = iterator(descriptor);
int i = 0;
while (it.hasNext() && i < descriptor.getValues().size()) {
final NamedResource update = descriptor.getValues().get(i);
final NamedResource existing = it.nextValue();
if (!existing.equals(update)) {
it.replace(createResource(update.getIdentifier().toString()));
}
i++;
}
removeObsoleteNodes(it);
if (i < descriptor.getValues().size()) {
appendNewNodes(descriptor, i, it.getCurrentNode());
}
}
private static void removeObsoleteNodes(AbstractListIterator it) {
while (it.hasNext()) {
it.nextValue();
it.removeWithoutReconnect();
}
}
public static SimpleListHandler simpleListHandler(StorageConnector connector) {
return new SimpleListHandler(connector);
}
public static ReferencedListHandler referencedListHandler(StorageConnector connector) {
return new ReferencedListHandler(connector);
}
}