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SPARQL input notation interfaces and implementations

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/*******************************************************************************
 * 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;

import org.eclipse.rdf4j.model.IRI;
import org.eclipse.rdf4j.model.vocabulary.SPIN;

/**
 * Enum of possible SPIN constraint violation levels.
 */
public enum ConstraintViolationLevel {
	INFO,
	WARNING,
	ERROR,
	FATAL;

	public static ConstraintViolationLevel valueOf(IRI levelValue) {
		ConstraintViolationLevel level;
		if (levelValue == null) {
			level = ConstraintViolationLevel.ERROR;
		} else if (SPIN.INFO_VIOLATION_LEVEL.equals(levelValue)) {
			level = ConstraintViolationLevel.INFO;
		} else if (SPIN.WARNING_VIOLATION_LEVEL.equals(levelValue)) {
			level = ConstraintViolationLevel.WARNING;
		} else if (SPIN.ERROR_VIOLATION_LEVEL.equals(levelValue)) {
			level = ConstraintViolationLevel.ERROR;
		} else if (SPIN.FATAL_VIOLATION_LEVEL.equals(levelValue)) {
			level = ConstraintViolationLevel.FATAL;
		} else {
			level = null;
		}
		return level;
	}
}