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ReferencedListHandler.java
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ReferencedListHandler.java
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/**
* Copyright (C) 2016 Czech Technical University in Prague
* <p>
* 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.
* <p>
* 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.sesame;
import cz.cvut.kbss.ontodriver.sesame.connector.Connector;
import cz.cvut.kbss.ontodriver.sesame.exceptions.SesameDriverException;
import cz.cvut.kbss.ontodriver.descriptor.ReferencedListDescriptor;
import cz.cvut.kbss.ontodriver.descriptor.ReferencedListValueDescriptor;
import cz.cvut.kbss.ontodriver.model.NamedResource;
import org.eclipse.rdf4j.model.IRI;
import org.eclipse.rdf4j.model.Resource;
import org.eclipse.rdf4j.model.Statement;
import org.eclipse.rdf4j.model.ValueFactory;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
public class ReferencedListHandler extends
ListHandler<ReferencedListDescriptor, ReferencedListValueDescriptor> {
private int sequenceCounter = 0;
ReferencedListHandler(Connector connector, ValueFactory vf) {
super(connector, vf);
}
@Override
SesameIterator createIterator(ReferencedListDescriptor listDescriptor) throws SesameDriverException {
return new ReferencedListIterator(listDescriptor, connector, vf);
}
@Override
IRI createListHead(ReferencedListValueDescriptor listValueDescriptor,
Collection<Statement> statements) throws SesameDriverException {
final IRI owner = owner(listValueDescriptor);
final IRI hasList = hasList(listValueDescriptor);
final IRI hasContent = hasContent(listValueDescriptor);
final IRI context = context(listValueDescriptor);
final IRI nodeUri = generateSequenceNode(owner, context);
statements.add(vf.createStatement(owner, hasList, nodeUri, context));
final IRI nodeContent = sesameIri(listValueDescriptor.getValues().get(0).getIdentifier());
statements.add(vf.createStatement(nodeUri, hasContent, nodeContent, context));
return nodeUri;
}
private IRI hasContent(ReferencedListDescriptor listDescriptor) {
return sesameIri(listDescriptor.getNodeContent().getIdentifier());
}
private IRI generateSequenceNode(IRI owner, IRI context) throws SesameDriverException {
final String uriBase = owner.stringValue();
boolean unique;
IRI node;
do {
node = vf.createIRI(uriBase + "-SEQ_" + sequenceCounter++);
final Collection<Statement> stmts = connector.findStatements(node, null, null, false,
context);
unique = stmts.isEmpty();
} while (!unique);
return node;
}
@Override
List<Statement> createListRest(IRI headNode, ReferencedListValueDescriptor listValueDescriptor)
throws SesameDriverException {
final IRI owner = owner(listValueDescriptor);
final IRI hasNext = hasNext(listValueDescriptor);
final IRI hasContent = hasContent(listValueDescriptor);
final IRI context = context(listValueDescriptor);
IRI previous = headNode;
final List<Statement> statements = new ArrayList<>(
listValueDescriptor.getValues().size() * 2);
final Iterator<NamedResource> it = listValueDescriptor.getValues().iterator();
// Skip the first element, it is already in the head
it.next();
while (it.hasNext()) {
final IRI content = sesameIri(it.next().getIdentifier());
previous = createListNode(owner, hasNext, hasContent, content, context, previous, statements);
}
return statements;
}
private IRI createListNode(IRI owner, IRI hasNext, IRI hasContent, IRI content, IRI context, Resource previous,
Collection<Statement> statements) throws SesameDriverException {
final IRI node = generateSequenceNode(owner, context);
statements.add(vf.createStatement(previous, hasNext, node, context));
statements.add(vf.createStatement(node, hasContent, content, context));
return node;
}
@Override
void clearList(ReferencedListValueDescriptor listDescriptor) throws SesameDriverException {
final IRI hasNext = hasNext(listDescriptor);
final IRI hasContent = hasContent(listDescriptor);
final boolean includeInferred = listDescriptor.getListProperty().isInferred();
final IRI context = context(listDescriptor);
Resource previous = owner(listDescriptor);
IRI currentProperty = hasList(listDescriptor);
final Collection<Statement> toRemove = new ArrayList<>();
Collection<Statement> next;
do {
next = connector.findStatements(previous, currentProperty, null, includeInferred, context);
if (!next.isEmpty()) {
final Resource node = extractListNode(next, currentProperty);
toRemove.addAll(next);
toRemove.addAll(connector.findStatements(node, hasContent, null, includeInferred, context));
previous = node;
}
currentProperty = hasNext;
} while (!next.isEmpty());
connector.removeStatements(toRemove);
}
@Override
SesameIterator iterator(ReferencedListValueDescriptor listDescriptor) throws SesameDriverException {
return new ReferencedListIterator(listDescriptor, connector, vf);
}
@Override
MergeResult mergeWithOriginalList(ReferencedListValueDescriptor listDescriptor, SesameIterator it)
throws SesameDriverException {
int i = 0;
Resource node = null;
while (it.hasNext() && i < listDescriptor.getValues().size()) {
node = it.nextNode();
final Resource content = it.currentContent();
final NamedResource newNode = listDescriptor.getValues().get(i);
if (!content.stringValue().equals(newNode.getIdentifier().toString())) {
it.replaceCurrentWith(newNode);
}
i++;
}
return new MergeResult(i, node);
}
@Override
void appendNewNodes(ReferencedListValueDescriptor listDescriptor, MergeResult mergeResult)
throws SesameDriverException {
int i = mergeResult.i;
Resource previous = mergeResult.previous;
final IRI owner = owner(listDescriptor);
final IRI hasNext = hasNext(listDescriptor);
final IRI hasContent = hasContent(listDescriptor);
final IRI context = context(listDescriptor);
assert i > 0;
final Collection<Statement> toAdd = new ArrayList<>((listDescriptor.getValues().size() - i) * 2);
while (i < listDescriptor.getValues().size()) {
final IRI content = sesameIri(listDescriptor.getValues().get(i).getIdentifier());
previous = createListNode(owner, hasNext, hasContent, content, context, previous, toAdd);
i++;
}
connector.addStatements(toAdd);
}
}