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General Interfaces for working with OWL objects
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/*
 * #%L
 * elk-reasoner
 * 
 * $Id: ElkEquivalentClassesAxiom.java 295 2011-08-10 11:43:29Z [email protected] $
 * $HeadURL: https://elk-reasoner.googlecode.com/svn/trunk/elk-reasoner/src/main/java/org/semanticweb/elk/syntax/interfaces/ElkEquivalentClassesAxiom.java $
 * %%
 * Copyright (C) 2011 Oxford University Computing Laboratory
 * %%
 * 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%
 */
/**
 * @author Markus Kroetzsch, Aug 8, 2011
 */
package org.semanticweb.elk.owl.interfaces;

import java.util.List;

import org.semanticweb.elk.owl.visitors.ElkEquivalentClassesAxiomVisitor;

/**
 * Corresponds to an
 * Equivalent
 * Class Axiom in the OWL 2 specification.
 * 
 * @author Markus Kroetzsch
 */
public interface ElkEquivalentClassesAxiom extends ElkClassAxiom {

	/**
	 * Get the list of equivalent class expressions that this axiom refers to.
	 * The order of class expressions does not affect the semantics but it is
	 * relevant to the syntax of OWL.
	 * 
	 * @return list of equivalent class expressions
	 */
	public List getClassExpressions();

	/**
	 * Accept an {@link ElkEquivalentClassesAxiomVisitor}.
	 * 
	 * @param visitor
	 *            the visitor that can work with this axiom type
	 * @param 
	 *            the type of the output of the visitor
	 * @return the output of the visitor
	 */
	public abstract  O accept(ElkEquivalentClassesAxiomVisitor visitor);

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

		/**
		 * Create an {@link ElkEquivalentClassesAxiom}.
		 * 
		 * @param first
		 *            the first equivalent {@link ElkClassExpression} for which
		 *            the axiom should be created
		 * @param second
		 *            the second equivalent {@link ElkClassExpression} for which
		 *            the axiom should be created
		 * @param other
		 *            other equivalent {@link ElkClassExpression}s for which the
		 *            axiom should be created
		 * @return an {@link ElkEquivalentClassesAxiom} corresponding to the
		 *         input
		 */
		public ElkEquivalentClassesAxiom getEquivalentClassesAxiom(
				ElkClassExpression first,
				ElkClassExpression second,
				ElkClassExpression... other);

		/**
		 * Create an {@link ElkEquivalentClassesAxiom}.
		 * 
		 * @param equivalentClassExpressions
		 *            the equivalent {@link ElkClassExpression}s for which the
		 *            axiom should be created
		 * @return an {@link ElkEquivalentClassesAxiom} corresponding to the
		 *         input
		 */
		public ElkEquivalentClassesAxiom getEquivalentClassesAxiom(
				List equivalentClassExpressions);

	}

}