org.eclipse.rdf4j.spin.function.apf.ConcatTupleFunction 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.apf;
import java.util.Collections;
import java.util.List;
import org.eclipse.rdf4j.common.iteration.CloseableIteration;
import org.eclipse.rdf4j.common.iteration.SingletonIteration;
import org.eclipse.rdf4j.model.Literal;
import org.eclipse.rdf4j.model.Value;
import org.eclipse.rdf4j.model.ValueFactory;
import org.eclipse.rdf4j.model.vocabulary.APF;
import org.eclipse.rdf4j.query.QueryEvaluationException;
import org.eclipse.rdf4j.query.algebra.evaluation.function.string.Concat;
import org.eclipse.rdf4j.spin.function.InverseMagicProperty;
public class ConcatTupleFunction implements InverseMagicProperty {
@Override
public String getURI() {
return APF.CONCAT.toString();
}
@Override
public CloseableIteration, QueryEvaluationException> evaluate(
ValueFactory valueFactory, Value... args) throws QueryEvaluationException {
Literal result = new Concat().evaluate(valueFactory, args);
return new SingletonIteration, QueryEvaluationException>(
Collections.singletonList(result));
}
}