org.eclipse.rdf4j.spin.function.spif.IndexOf 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.model.Literal;
import org.eclipse.rdf4j.model.Value;
import org.eclipse.rdf4j.model.ValueFactory;
import org.eclipse.rdf4j.model.vocabulary.SPIF;
import org.eclipse.rdf4j.query.algebra.evaluation.ValueExprEvaluationException;
import org.eclipse.rdf4j.query.algebra.evaluation.function.Function;
public class IndexOf implements Function {
@Override
public String getURI() {
return SPIF.INDEX_OF_FUNCTION.toString();
}
@Override
public Value evaluate(ValueFactory valueFactory, Value... args) throws ValueExprEvaluationException {
if (args.length < 2 || args.length > 3) {
throw new ValueExprEvaluationException("Incorrect number of arguments");
}
if (!(args[0] instanceof Literal)) {
throw new ValueExprEvaluationException("First argument must be a string");
}
if (!(args[1] instanceof Literal)) {
throw new ValueExprEvaluationException("Second argument must be a string");
}
if (args.length == 3 && !(args[2] instanceof Literal)) {
throw new ValueExprEvaluationException("Third argument must be an integer");
}
Literal s = (Literal) args[0];
Literal t = (Literal) args[1];
int pos = (args.length == 3) ? ((Literal) args[2]).intValue() : 0;
int index = s.getLabel().indexOf(t.getLabel(), pos);
if (index == -1) {
throw new ValueExprEvaluationException("Substring not found");
}
return valueFactory.createLiteral(index);
}
}