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/**
 * 
 */
package org.semanticweb.elk.reasoner.saturation.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.IndexedContextRoot;
import org.semanticweb.elk.reasoner.indexing.model.IndexedObjectSomeValuesFrom;
import org.semanticweb.elk.reasoner.saturation.conclusions.model.BackwardLink;
import org.semanticweb.elk.reasoner.saturation.conclusions.model.SubClassInclusionDecomposed;
import org.semanticweb.elk.reasoner.tracing.Conclusion;
import org.semanticweb.elk.reasoner.tracing.Conclusion.Factory;

//TODO: split on two inferences
/**
 * A {@link ClassInference} producing a {@link BackwardLink} from a
 * {@link SubClassInclusionDecomposed} with
 * {@link SubClassInclusionDecomposed#getSubsumer()} of the type
 * {@link IndexedObjectSomeValuesFrom}.

 * 
 * Notation:
 * 
 * {@code
 *    [C] ⊑ -∃R.D
 * ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
 *  C ⊑ <∃R>.[D ⊓ ∃R-]
 * }
 * 
 * The parameters can be obtained as follows:

 * 
 * C = {@link #getOrigin()} = {@link #getConclusionSource()} 

 * ∃R.D = {@link #getDecomposedExistential()} (from which R and D can be
 * obtained)

 * D⊓∃R- = {@link #getDestination()}

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

	private final IndexedObjectSomeValuesFrom existential_;

	public BackwardLinkOfObjectSomeValuesFrom(IndexedContextRoot inferenceRoot,
			IndexedObjectSomeValuesFrom subsumer) {
		super(IndexedObjectSomeValuesFrom.Helper.getTarget(subsumer),
				subsumer.getProperty(), inferenceRoot);
		existential_ = subsumer;
	}

	@Override
	public IndexedContextRoot getOrigin() {
		return getTraceRoot();
	}

	public IndexedObjectSomeValuesFrom getDecomposedExistential() {
		return this.existential_;
	}

	public SubClassInclusionDecomposed getPremise(
			SubClassInclusionDecomposed.Factory factory) {
		return factory.getSubClassInclusionDecomposed(getOrigin(),
				existential_);
	}

	@Override
	public int getPremiseCount() {
		return 1;
	}

	@Override
	public Conclusion getPremise(int index, Factory factory) {
		switch (index) {
		case 0:
			return getPremise(factory);
		default:
			return failGetPremise(index);
		}
	}

	@Override
	public final  O accept(BackwardLinkInference.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(BackwardLinkOfObjectSomeValuesFrom inference);

	}

}