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ReferencedListHandler.java
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ReferencedListHandler.java
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package cz.cvut.kbss.ontodriver.jena.list;
import cz.cvut.kbss.ontodriver.descriptor.ReferencedListDescriptor;
import cz.cvut.kbss.ontodriver.descriptor.ReferencedListValueDescriptor;
import cz.cvut.kbss.ontodriver.jena.connector.StorageConnector;
import cz.cvut.kbss.ontodriver.model.NamedResource;
import org.apache.jena.rdf.model.Property;
import org.apache.jena.rdf.model.Resource;
import org.apache.jena.rdf.model.Statement;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import static org.apache.jena.rdf.model.ResourceFactory.*;
class ReferencedListHandler extends ListHandler<ReferencedListDescriptor, ReferencedListValueDescriptor> {
ReferencedListHandler(StorageConnector connector) {
super(connector);
}
@Override
AbstractListIterator iterator(ReferencedListDescriptor descriptor) {
return new ReferencedListIterator(descriptor, connector);
}
@Override
AbstractListIterator iterator(ReferencedListValueDescriptor descriptor) {
return iterator((ReferencedListDescriptor) descriptor);
}
@Override
void appendNewNodes(ReferencedListValueDescriptor descriptor, int i, Resource lastNode) {
assert lastNode != null;
final List<Statement> toAdd = new ArrayList<>((descriptor.getValues().size() - i) * 2);
final Property hasList = createProperty(descriptor.getListProperty().getIdentifier().toString());
final Property hasNext = createProperty(descriptor.getNextNode().getIdentifier().toString());
final Property hasContent = createProperty(descriptor.getNodeContent().getIdentifier().toString());
final String context = descriptor.getContext() != null ? descriptor.getContext().toString() : null;
for (; i < descriptor.getValues().size(); i++) {
lastNode =
appendNode(lastNode, descriptor.getValues().get(i), i == 0 ? hasList : hasNext, hasContent, context,
toAdd);
}
if (context != null) {
connector.add(toAdd, context);
} else {
connector.add(toAdd);
}
}
private Resource appendNode(Resource previousNode, NamedResource value, Property link, Property hasContent,
String context, List<Statement> statements) {
final Resource node = generateNewListNode(value.getIdentifier(), context);
statements.add(createStatement(previousNode, link, node));
statements.add(createStatement(node, hasContent, createResource(value.getIdentifier().toString())));
return node;
}
private Resource generateNewListNode(URI baseUri, String context) {
Resource node;
int index = 0;
Collection<Statement> statements;
do {
node = createResource(baseUri.toString() + "-SEQ_" + index++);
if (context != null) {
statements = connector.find(node, null, null, context);
} else {
statements = connector.find(node, null, null);
}
} while (!statements.isEmpty());
return node;
}
}