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ELK plug-in for Protege ontology editor

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/*-
 * #%L
 * ELK Reasoner Protege Plug-in
 * $Id:$
 * $HeadURL:$
 * %%
 * Copyright (C) 2011 - 2017 Department of Computer Science, University of Oxford
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */
package org.semanticweb.elk.protege.proof;

import java.util.Collections;
import java.util.Set;

import org.liveontologies.puli.Inference;
import org.liveontologies.puli.Inferences;
import org.liveontologies.puli.Proof;
import org.semanticweb.elk.owlapi.ElkProver;
import org.semanticweb.elk.owlapi.ElkReasoner;
import org.semanticweb.owlapi.model.OWLAxiom;

public class ElkOwlJustificationProofService
		extends ElkJustificationProofService {

	@Override
	public Proof> computeProof(OWLAxiom entailment) {
		ElkReasoner elkReasoner = getCurrentElkReasoner();
		if (elkReasoner == null) {
			return null;
		}
		// else
		ElkProver elkProver = new ElkProver(elkReasoner);
		return elkProver.getProof(entailment);
	}

	@Override
	public String getName() {
		return "ELK OWL Proof";
	}

	@Override
	public Set getJustification(Inference inference) {

		if (Inferences.isAsserted(inference)) {
			Object conclusion = inference.getConclusion();
			if (conclusion instanceof OWLAxiom) {
				return Collections
						.singleton((OWLAxiom) inference.getConclusion());
			}
		}
		// else
		return Collections.emptySet();
	}

}