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TypesHandler.java
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TypesHandler.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.model.*;
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.Resource;
import org.eclipse.rdf4j.model.Statement;
import org.eclipse.rdf4j.model.ValueFactory;
import org.eclipse.rdf4j.model.vocabulary.RDF;
import java.net.URI;
import java.util.*;
class TypesHandler {
private final Connector connector;
private final ValueFactory valueFactory;
TypesHandler(Connector connector, ValueFactory valueFactory) {
this.connector = connector;
this.valueFactory = valueFactory;
}
Set<Axiom<URI>> getTypes(NamedResource individual, URI context, boolean includeInferred)
throws SesameDriverException {
final Collection<Statement> statements = getTypesStatements(individual, context, includeInferred);
if (statements.isEmpty()) {
return Collections.emptySet();
}
return resolveTypes(individual, includeInferred, statements);
}
private Collection<Statement> getTypesStatements(NamedResource individual, URI context, boolean includeInferred)
throws SesameDriverException {
final Resource subject = SesameUtils.toSesameIri(individual.getIdentifier(), valueFactory);
final org.eclipse.rdf4j.model.IRI contextUri = SesameUtils.toSesameIri(context, valueFactory);
return connector.findStatements(subject, RDF.TYPE, null, includeInferred, contextUri);
}
private Set<Axiom<URI>> resolveTypes(NamedResource individual, boolean includeInferred,
Collection<Statement> statements) {
final Set<Axiom<URI>> types = new HashSet<>(statements.size());
final Assertion clsAssertion = Assertion.createClassAssertion(includeInferred);
for (Statement stmt : statements) {
assert stmt.getObject() instanceof Resource;
final URI type = SesameUtils.toJavaUri((Resource) stmt.getObject());
if (type == null) {
// It was a blank node
continue;
}
types.add(new AxiomImpl<>(individual, clsAssertion, new Value<>(type)));
}
return types;
}
void addTypes(NamedResource individual, URI context, Set<URI> types) throws SesameDriverException {
final Collection<Statement> statements = prepareSesameStatements(individual, context, types);
connector.addStatements(statements);
}
private Collection<Statement> prepareSesameStatements(NamedResource individual, URI context, Set<URI> types) {
final org.eclipse.rdf4j.model.IRI subject = SesameUtils.toSesameIri(individual.getIdentifier(), valueFactory);
final org.eclipse.rdf4j.model.IRI contextUri = SesameUtils.toSesameIri(context, valueFactory);
final Collection<Statement> statements = new ArrayList<>(types.size());
for (URI type : types) {
statements.add(valueFactory
.createStatement(subject, RDF.TYPE, valueFactory.createIRI(type.toString()), contextUri));
}
return statements;
}
void removeTypes(NamedResource individual, URI context, Set<URI> types) throws SesameDriverException {
final Collection<Statement> statements = prepareSesameStatements(individual, context, types);
connector.removeStatements(statements);
}
}