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IdentifierGenerator.java
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IdentifierGenerator.java
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/**
* Copyright (C) 2019 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.ontodriver.owlapi.util;
import cz.cvut.kbss.ontodriver.exception.IdentifierGenerationException;
import cz.cvut.kbss.ontodriver.util.IdentifierUtils;
import org.semanticweb.owlapi.model.IRI;
import org.semanticweb.owlapi.model.OWLOntology;
import java.net.URI;
public class IdentifierGenerator {
private static final int GENERATION_THRESHOLD = 100;
private final OWLOntology ontology;
public IdentifierGenerator(OWLOntology ontology) {
assert ontology != null;
this.ontology = ontology;
}
/**
* Generates an identifier which is unique w.r.t. individuals in the known ontology.
*
* @param classUri URI of individual's class, used as base for the identifier
* @return Unique identifier
* @throws IdentifierGenerationException If unable to generate unique identifier
*/
public URI generateIdentifier(URI classUri) {
boolean unique = false;
URI id = null;
int counter = 0;
while (!unique && counter++ < GENERATION_THRESHOLD) {
id = IdentifierUtils.generateIdentifier(classUri);
unique = isIdentifierUnique(id);
}
if (!unique) {
throw new IdentifierGenerationException("Unable to generate a unique identifier.");
}
return id;
}
private boolean isIdentifierUnique(URI uri) {
return !ontology.containsIndividualInSignature(IRI.create(uri));
}
}