org.eclipse.rdf4j.spin.function.spif.BuildURI 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 java.util.HashMap;
import java.util.Map;
import org.apache.commons.text.StringSubstitutor;
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 BuildURI implements Function {
@Override
public String getURI() {
return SPIF.BUILD_URI_FUNCTION.toString();
}
@Override
public Value evaluate(ValueFactory valueFactory, Value... args) throws ValueExprEvaluationException {
if (args.length < 1) {
throw new ValueExprEvaluationException("Incorrect number of arguments");
}
if (!(args[0] instanceof Literal)) {
throw new ValueExprEvaluationException("First argument must be a string");
}
Literal s = (Literal) args[0];
String tmpl = s.getLabel();
Map mappings = new HashMap<>(args.length);
for (int i = 1; i < args.length; i++) {
mappings.put(Integer.toString(i), args[i].stringValue());
}
String newValue = StringSubstitutor.replace(tmpl, mappings, "{?", "}");
if (tmpl.charAt(0) == '<' && tmpl.charAt(tmpl.length() - 1) == '>') {
return valueFactory.createIRI(newValue.substring(1, newValue.length() - 1));
}
throw new ValueExprEvaluationException("Invalid URI template: " + tmpl);
}
}