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package org.semanticweb.elk.reasoner.indexing.model;

/*
 * #%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.owl.interfaces.ElkObjectHasSelf;
import org.semanticweb.elk.owl.interfaces.ElkObjectProperty;
import org.semanticweb.elk.reasoner.saturation.inferences.BackwardLinkOfObjectHasSelf;
import org.semanticweb.elk.reasoner.saturation.inferences.ForwardLinkOfObjectHasSelf;
import org.semanticweb.elk.reasoner.saturation.rules.ClassInferenceProducer;

/**
 * An {@link IndexedClassExpression} constructed from an
 * {@link IndexedObjectProperty}.

 * 
 * Notation:
 * 
 *  * ∃R.Self
 * 
 * 
 * It is logically equivalent to OWL class expression {@code ObjectHasSelf(R)}
 * 

 * 
 * The parameters can be obtained as follows:

 * 
 * R = {@link #getProperty()}

 * 
 * @author "Yevgeny Kazakov"
 */
public interface IndexedObjectHasSelf extends IndexedComplexClassExpression {

	/**
	 * @return The representation of the {@link ElkObjectProperty} that is a
	 *         property of the {@link ElkObjectHasSelf} represented by this
	 *         {@link IndexedObjectHasSelf}.
	 * 
	 * @see ElkObjectHasSelf#getProperty()
	 */
	IndexedObjectProperty getProperty();

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

		O visit(IndexedObjectHasSelf element);

	}

	class Helper {

		public static void produceDecomposedExistentialLink(
				ClassInferenceProducer producer, IndexedContextRoot root,
				IndexedObjectHasSelf subsumer) {
			producer.produce(
					new BackwardLinkOfObjectHasSelf(root, subsumer));
			if (!subsumer.getProperty().getSaturated()
					.getNonRedundantCompositionsByLeftSubProperty().isEmpty()) {
				producer.produce(
						new ForwardLinkOfObjectHasSelf(root, subsumer));
			}
		}

	}

}