NonPositiveIntegerCast.java
/*******************************************************************************
* Copyright (c) 2016 Eclipse RDF4J contributors.
*
* 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.query.algebra.evaluation.function.xsd;
import java.math.BigInteger;
import java.util.Optional;
import org.eclipse.rdf4j.model.Literal;
import org.eclipse.rdf4j.model.ValueFactory;
import org.eclipse.rdf4j.model.base.CoreDatatype;
import org.eclipse.rdf4j.model.datatypes.XMLDatatypeUtil;
/**
* A {@link org.eclipse.rdf4j.query.algebra.evaluation.function.Function} that tries to cast its argument to an
* <var>xsd:nonPositiveInteger</var> .
*
* @author Jeen Broekstra
*/
public class NonPositiveIntegerCast extends IntegerCastFunction {
@Override
protected CoreDatatype.XSD getCoreXsdDatatype() {
return CoreDatatype.XSD.NON_POSITIVE_INTEGER;
}
@Override
protected boolean isValidForDatatype(String lexicalValue) {
return XMLDatatypeUtil.isValidNonPositiveInteger(lexicalValue);
}
@Override
protected Optional<Literal> createTypedLiteral(ValueFactory vf, BigInteger integerValue) {
if (integerValue.compareTo(BigInteger.ZERO) <= 0) {
return Optional.of(vf.createLiteral(integerValue.toString(), getCoreXsdDatatype()));
}
return Optional.empty();
}
@Override
protected Optional<Literal> createTypedLiteral(ValueFactory vf, boolean booleanValue) {
Literal result = null;
if (!booleanValue) {
result = vf.createLiteral("0", getCoreXsdDatatype());
}
return Optional.ofNullable(result);
}
}