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/**
 * 
 */
package org.semanticweb.elk.reasoner.saturation.properties.inferences;

/*
 * #%L
 * ELK Reasoner
 * $Id:$
 * $HeadURL:$
 * %%
 * Copyright (C) 2011 - 2015 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%
 */

import org.semanticweb.elk.reasoner.indexing.model.IndexedPropertyChain;
import org.semanticweb.elk.reasoner.saturation.conclusions.model.SubPropertyChain;
import org.semanticweb.elk.reasoner.tracing.Conclusion;
import org.semanticweb.elk.reasoner.tracing.Conclusion.Factory;

/**
 * An {@link ObjectPropertyInference} producing a tautological
 * {@link SubPropertyChain} from no premises:

 * 
 *  * ⎯⎯⎯⎯⎯⎯⎯⎯
 *  P ⊑ P
 * 
 * 
 * The parameters can be obtained as follows:

 * 
 * P = {@link #getChain()}

 * 
 * @author Pavel Klinov
 *
 *         [email protected]
 * @author "Yevgeny Kazakov"
 */
public class SubPropertyChainTautology
		extends AbstractSubPropertyChainInference {

	public SubPropertyChainTautology(IndexedPropertyChain chain) {
		super(chain, chain);
	}

	public IndexedPropertyChain getChain() {
		return super.getSubChain();
	}

	@Override
	public int getPremiseCount() {
		return 0;
	}

	@Override
	public Conclusion getPremise(int index, Factory factory) {
		return failGetPremise(index);
	}

	@Override
	public final  O accept(SubPropertyChainInference.Visitor visitor) {
		return visitor.visit(this);
	}

	/**
	 * Visitor pattern for instances
	 * 
	 * @author Yevgeny Kazakov
	 *
	 * @param 
	 *            the type of the output
	 */
	public static interface Visitor {

		public O visit(SubPropertyChainTautology inference);

	}

}