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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.ArrayList;
import java.util.List;

import org.semanticweb.elk.owl.interfaces.ElkAxiom;
import org.semanticweb.elk.owl.interfaces.ElkClassExpression;
import org.semanticweb.elk.owl.interfaces.ElkEquivalentClassesAxiom;
import org.semanticweb.elk.owl.interfaces.ElkObject;
import org.semanticweb.elk.owl.interfaces.ElkSubClassOfAxiom;

/**
 * Represents the inference:
 * 
 *  *  EquivalentClasses(C0 C1 ... Cn)
 * ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
 *           Ci ⊑ Cj
 * 
 * 
 * @author Yevgeny Kazakov
 *
 */
public class ElkClassInclusionOfEquivaletClasses extends AbstractElkInference {

	public final static String NAME = "Equivalent Classes Decomposition";

	private final List expressions_;

	/**
	 * positions for sub-class and super-class within class equivalence
	 */
	private final int subPos_, superPos_;

	ElkClassInclusionOfEquivaletClasses(
			List expressions, int subPos,
			int superPos) {
		this.expressions_ = expressions;
		this.subPos_ = subPos;
		this.superPos_ = superPos;
	}

	ElkClassInclusionOfEquivaletClasses(ElkClassExpression first,
			ElkClassExpression second, boolean sameOrder) {
		List expressions = new ArrayList(
				2);
		expressions.add(first);
		expressions.add(second);
		this.expressions_ = expressions;
		if (sameOrder) {
			subPos_ = 0;
			superPos_ = 1;
		} else {
			subPos_ = 1;
			superPos_ = 0;
		}
	}

	public List getExpressions() {
		return expressions_;
	}

	public int getSubPos() {
		return subPos_;
	}

	public int getSuperPos() {
		return superPos_;
	}

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

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

	@Override
	public ElkAxiom getPremise(int index, ElkObject.Factory factory) {
		if (index == 0) {
			return getPremise(factory);
		}
		// else
		return failGetPremise(index);
	}

	public ElkEquivalentClassesAxiom getPremise(ElkObject.Factory factory) {
		return factory.getEquivalentClassesAxiom(expressions_);
	}

	@Override
	public ElkSubClassOfAxiom getConclusion(ElkObject.Factory factory) {
		return factory.getSubClassOfAxiom(expressions_.get(subPos_),
				expressions_.get(superPos_));
	}

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

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

		ElkClassInclusionOfEquivaletClasses getElkClassInclusionOfEquivaletClasses(
				List expressions, int subPos,
				int superPos);

		ElkClassInclusionOfEquivaletClasses getElkClassInclusionOfEquivaletClasses(
				ElkClassExpression first, ElkClassExpression second,
				boolean sameOrder);

	}

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

		O visit(ElkClassInclusionOfEquivaletClasses inference);

	}

}