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ReferencedListIterator.java
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ReferencedListIterator.java
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/**
* Copyright (C) 2020 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.descriptor.ReferencedListDescriptor;
import cz.cvut.kbss.ontodriver.exception.IntegrityConstraintViolatedException;
import cz.cvut.kbss.ontodriver.model.Axiom;
import cz.cvut.kbss.ontodriver.model.NamedResource;
import cz.cvut.kbss.ontodriver.sesame.connector.Connector;
import cz.cvut.kbss.ontodriver.sesame.exceptions.SesameDriverException;
import cz.cvut.kbss.ontodriver.sesame.util.SesameUtils;
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.Collections;
class ReferencedListIterator extends AbstractSesameIterator {
private final ReferencedListDescriptor listDescriptor;
private final IRI hasContentProperty;
private IRI currentProperty;
private Statement currentNode;
private Statement currentContent;
private Collection<Statement> next;
public ReferencedListIterator(ReferencedListDescriptor listDescriptor, Connector connector, ValueFactory vf)
throws SesameDriverException {
super(listDescriptor, connector, vf);
this.listDescriptor = listDescriptor;
this.hasContentProperty = SesameUtils.toSesameIri(listDescriptor.getNodeContent().getIdentifier(), vf);
this.currentProperty = hasListProperty;
init();
}
private void init() throws SesameDriverException {
this.next = connector.findStatements(listOwner, hasListProperty, null, includeInferred, contexts());
}
@Override
public boolean hasNext() {
return !next.isEmpty();
}
@Override
public Resource nextNode() throws SesameDriverException {
nextInternal();
return (Resource) currentNode.getObject();
}
private void nextInternal() throws SesameDriverException {
if (!hasNext()) {
throw new IllegalStateException();
}
checkSuccessorMax(next, currentProperty);
this.currentNode = next.iterator().next();
this.currentProperty = currentNode.getPredicate();
checkNodeIsResource(currentNode);
final Resource elem = (Resource) currentNode.getObject();
this.currentContent = getNodeContent(elem);
this.next = connector.findStatements(elem, hasNextProperty, null, includeInferred, contexts());
}
private Statement getNodeContent(Resource node) throws SesameDriverException {
final Collection<Statement> elements = connector.findStatements(node, hasContentProperty,
null, includeInferred, contexts());
checkSuccessorMax(elements, hasContentProperty);
if (elements.isEmpty()) {
throw new IntegrityConstraintViolatedException("Node " + node + " has no content.");
}
final Statement elem = elements.iterator().next();
checkNodeIsResource(elem);
return elem;
}
@Override
public Resource currentContent() throws SesameDriverException {
assert currentContent.getObject() instanceof Resource;
return (Resource) currentContent.getObject();
}
@Override
public Axiom<NamedResource> nextAxiom() throws SesameDriverException {
nextInternal();
assert currentContent.getObject() instanceof Resource;
return createAxiom(currentContent.getSubject(), listDescriptor.getNodeContent(),
(Resource) currentContent.getObject());
}
@Override
public void remove() throws SesameDriverException {
assert currentNode.getObject() instanceof Resource;
final Collection<Statement> toRemove = new ArrayList<>();
toRemove.add(currentNode);
toRemove.add(currentContent);
if (!next.isEmpty()) {
toRemove.addAll(next);
final Statement stmt = next.iterator().next();
checkNodeIsResource(stmt);
final Resource nextNode = (Resource) stmt.getObject();
final Statement connectNext = vf
.createStatement(currentNode.getSubject(), currentProperty, nextNode, context);
this.next = Collections.singleton(connectNext);
this.currentNode = null;
this.currentContent = null;
connector.addStatements(next);
} else {
next = Collections.emptyList();
}
connector.removeStatements(toRemove);
}
@Override
public void replaceCurrentWith(NamedResource newContent) throws SesameDriverException {
assert currentNode.getObject() instanceof Resource;
// We just replace the original content statement with new one
connector.removeStatements(Collections.singleton(currentContent));
final Resource node = (Resource) currentNode.getObject();
final Statement stmt = vf
.createStatement(node, hasContentProperty, SesameUtils.toSesameIri(newContent.getIdentifier(), vf),
context);
connector.addStatements(Collections.singleton(stmt));
}
}