UnaryFunction.java

/*******************************************************************************
 * 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.query.algebra.evaluation.function;

import org.eclipse.rdf4j.model.Value;
import org.eclipse.rdf4j.model.ValueFactory;
import org.eclipse.rdf4j.query.algebra.evaluation.ValueExprEvaluationException;

public abstract class UnaryFunction implements Function {

	@Override
	public Value evaluate(ValueFactory valueFactory, Value... args) throws ValueExprEvaluationException {
		if (args.length != 1) {
			throw new ValueExprEvaluationException(
					String.format("%s requires 1 argument, got %d", getURI(), args.length));
		}

		return evaluate(valueFactory, args[0]);
	}

	protected abstract Value evaluate(ValueFactory valueFactory, Value arg) throws ValueExprEvaluationException;
}