org.semanticweb.elk.reasoner.saturation.inferences.ClassInconsistencyOfObjectComplementOf Maven / Gradle / Ivy

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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.IndexedObjectComplementOf;
import org.semanticweb.elk.reasoner.saturation.conclusions.model.ClassInconsistency;
import org.semanticweb.elk.reasoner.saturation.conclusions.model.SubClassInclusionComposed;
import org.semanticweb.elk.reasoner.saturation.conclusions.model.SubClassInclusionDecomposed;
import org.semanticweb.elk.reasoner.tracing.Conclusion;
import org.semanticweb.elk.reasoner.tracing.Conclusion.Factory;

/**
 * A {@link ClassInference} producing a {@link ClassInconsistency} obtained from
 * {@link SubClassInclusionComposed} and {@link SubClassInclusionDecomposed}
 * such that {@link SubClassInclusionDecomposed#getSubsumer()} is the negation
 * of the {@link SubClassInclusionComposed#getSubsumer()}:

 * 
 *  *     (1)       (2)
 *  [C] ⊑ +D  [C] ⊑ -¬D
 * ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
 *        [C] ⊑ 0
 * 
 * 
 * The parameters can be obtained as follows:

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

 * ¬D = {@link #getNegation()} (from which D can be obtained)

 * 
 * @see IndexedObjectComplementOf#getNegated()
 * 
 * @author Pavel Klinov
 * 
 *         [email protected]
 * 
 * @author Yevgeny Kazakov
 */
public class ClassInconsistencyOfObjectComplementOf
		extends AbstractClassInconsistencyInference {

	private final IndexedObjectComplementOf negation_;

	public ClassInconsistencyOfObjectComplementOf(IndexedContextRoot root,
			IndexedObjectComplementOf negatedSubsumer) {
		super(root);
		this.negation_ = negatedSubsumer;
	}

	public IndexedObjectComplementOf getNegation() {
		return negation_;
	}

	public SubClassInclusionComposed getFirstPremise(
			SubClassInclusionComposed.Factory factory) {
		return factory.getSubClassInclusionComposed(getOrigin(),
				negation_.getNegated());
	}

	public SubClassInclusionDecomposed getSecondPremise(
			SubClassInclusionDecomposed.Factory factory) {
		return factory.getSubClassInclusionDecomposed(getOrigin(), negation_);
	}

	@Override
	public int getPremiseCount() {
		return 2;
	}

	@Override
	public Conclusion getPremise(int index, Factory factory) {
		switch (index) {
		case 0:
			return getFirstPremise(factory);
		case 1:
			return getSecondPremise(factory);
		default:
			return failGetPremise(index);
		}
	}

	@Override
	public final  O accept(ClassInconsistencyInference.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(ClassInconsistencyOfObjectComplementOf inference);

	}

}