org.eclipse.rdf4j.spin.function.spif.HasAllObjects Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2015 Eclipse RDF4J contributors, Aduna, and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Distribution License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*******************************************************************************/
package org.eclipse.rdf4j.spin.function.spif;
import org.eclipse.rdf4j.common.iteration.Iteration;
import org.eclipse.rdf4j.model.IRI;
import org.eclipse.rdf4j.model.Resource;
import org.eclipse.rdf4j.model.Value;
import org.eclipse.rdf4j.model.ValueFactory;
import org.eclipse.rdf4j.model.impl.BooleanLiteral;
import org.eclipse.rdf4j.model.vocabulary.SPIF;
import org.eclipse.rdf4j.query.QueryEvaluationException;
import org.eclipse.rdf4j.query.algebra.evaluation.QueryPreparer;
import org.eclipse.rdf4j.query.algebra.evaluation.ValueExprEvaluationException;
import org.eclipse.rdf4j.query.algebra.evaluation.function.Function;
import org.eclipse.rdf4j.query.algebra.evaluation.util.TripleSources;
import org.eclipse.rdf4j.spin.function.AbstractSpinFunction;
public class HasAllObjects extends AbstractSpinFunction implements Function {
public HasAllObjects() {
super(SPIF.HAS_ALL_OBJECTS_FUNCTION.stringValue());
}
@Override
public Value evaluate(ValueFactory valueFactory, Value... args) throws ValueExprEvaluationException {
QueryPreparer qp = getCurrentQueryPreparer();
if (args.length != 3) {
throw new ValueExprEvaluationException(
String.format("%s requires 3 argument, got %d", getURI(), args.length));
}
Resource subj = (Resource) args[0];
IRI pred = (IRI) args[1];
Resource list = (Resource) args[2];
try {
Iteration iter = TripleSources.list(list, qp.getTripleSource());
while (iter.hasNext()) {
Value obj = iter.next();
if (TripleSources.single(subj, pred, obj, qp.getTripleSource()) == null) {
return BooleanLiteral.FALSE;
}
}
} catch (QueryEvaluationException e) {
throw new ValueExprEvaluationException(e);
}
return BooleanLiteral.TRUE;
}
}