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Utilities to present tracing results (encoded proofs) to the user
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package org.semanticweb.elk.owl.inferences;

/*-
 * #%L
 * ELK Proofs Package
 * $Id:$
 * $HeadURL:$
 * %%
 * Copyright (C) 2011 - 2016 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 java.util.Arrays;
import java.util.List;

import org.semanticweb.elk.owl.interfaces.ElkObject;
import org.semanticweb.elk.owl.interfaces.ElkObjectPropertyExpression;
import org.semanticweb.elk.owl.interfaces.ElkSubObjectPropertyExpression;
import org.semanticweb.elk.owl.interfaces.ElkSubObjectPropertyOfAxiom;

/**
 * Represents the inference:
 * 
 *  *   (1)           (n)
 *  P ⊑ R1 ... Rn-1 ⊑ Rn
 * ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
 *        P ⊑ Rn
 * 
 * 
 * @author Yevgeny Kazakov
 *
 */
public class ElkPropertyInclusionHierarchy extends AbstractElkInference {

	public final static String NAME = "Property Hierarchy";

	private final ElkSubObjectPropertyExpression subExpression_;

	private final List expressions_;

	ElkPropertyInclusionHierarchy(ElkSubObjectPropertyExpression subExpression,
			List expressions) {
		this.subExpression_ = subExpression;
		this.expressions_ = expressions;
	}

	ElkPropertyInclusionHierarchy(ElkSubObjectPropertyExpression subExpression,
			ElkObjectPropertyExpression... expressions) {
		this(subExpression, Arrays.asList(expressions));
	}

	public ElkSubObjectPropertyExpression getSubExpression() {
		return subExpression_;
	}

	public List getExpressions() {
		return expressions_;
	}

	@Override
	public String getName() {
		return NAME;
	}

	@Override
	public int getPremiseCount() {
		return expressions_.size();
	}

	@Override
	public ElkSubObjectPropertyOfAxiom getPremise(int index,
			ElkObject.Factory factory) {
		checkPremiseIndex(index);
		// else
		if (index == 0) {
			return factory.getSubObjectPropertyOfAxiom(subExpression_,
					expressions_.get(0));
		}
		// else index > 0
		return factory.getSubObjectPropertyOfAxiom(expressions_.get(index - 1),
				expressions_.get(index));

	}

	@Override
	public ElkSubObjectPropertyOfAxiom getConclusion(
			ElkObject.Factory factory) {
		return factory.getSubObjectPropertyOfAxiom(subExpression_,
				expressions_.get(expressions_.size() - 1));
	}

	public  O accept(Visitor visitor) {
		return visitor.visit(this);
	}

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

	/**
	 * A factory for creating instances
	 * 
	 * @author Yevgeny Kazakov
	 *
	 */
	public interface Factory {

		ElkPropertyInclusionHierarchy getElkPropertyInclusionHierarchy(
				ElkSubObjectPropertyExpression subExpression,
				ElkObjectPropertyExpression... expressions);

		ElkPropertyInclusionHierarchy getElkPropertyInclusionHierarchy(
				ElkSubObjectPropertyExpression subExpression,
				List expressions);

	}

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

		O visit(ElkPropertyInclusionHierarchy inference);

	}

}