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/*
 * This file is part of the OWL API.
 *
 * The contents of this file are subject to the LGPL License, Version 3.0.
 *
 * Copyright (C) 2011, The University of Manchester
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/.
 *
 *
 * Alternatively, the contents of this file may be used under the terms of the Apache License, Version 2.0
 * in which case, the provisions of the Apache License Version 2.0 are applicable instead of those above.
 *
 * Copyright 2011, University of Manchester
 *
 * 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.
 */

package org.semanticweb.owlapi.model;

import java.util.Set;


/**
 * Author: Matthew Horridge

 * The University Of Manchester

 * Bio-Health Informatics Group
 * Date: 24-Oct-2006
 * 
 * Represents an EquivalentClasses axiom in the OWL 2 Specification.
 */
public interface OWLEquivalentClassesAxiom extends OWLNaryClassAxiom {

    /**
     * Determines if this equivalent classes axiom contains at least one
     * named class (excluding owl:Thing or owl:Nothing).
     *
     * @return true if the axiom contains at least one named class
     *         otherwise false. Note that this method will return false
     *         if the only named classes are owl:Thing or owl:Nothing.
     */
    boolean containsNamedEquivalentClass();

    /**
     * Gets the named classes (excluding owl:Thing and owl:Nothing) that are in this equivalent classes axiom.
     *
     * @return A set of classes that represents the named classes that are specified to be
     *         equivalent to some other class (expression), excluding the built in classes owl:Thing
     *         and owl:Nothing
     */
    Set getNamedClasses();

    /**
     * Determines if this class axiom makes a class expression equivalent to nothing.
     *
     * @return true if this axiom contains owl:Nothing as an equivalent
     *         class.
     */
    boolean containsOWLNothing();


    /**
     * Determines if this class axiom makes a class expression equivalent to thing.
     *
     * @return true if this axioms contains owl:Thing as an equivalent class.
     */
    boolean containsOWLThing();

    @Override
    Set asPairwiseAxioms();

    @Override
    OWLEquivalentClassesAxiom getAxiomWithoutAnnotations();
}