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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, The 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;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import org.semanticweb.owlapi.model.AddAxiom;
import org.semanticweb.owlapi.model.OWLClassExpression;
import org.semanticweb.owlapi.model.OWLDataFactory;
import org.semanticweb.owlapi.model.OWLOntology;
import org.semanticweb.owlapi.model.OWLOntologyChange;
import org.semanticweb.owlapi.util.CollectionFactory;

/**
 * Given a set of class expressions, this composite change will make them
 * mutually disjoint. The composite change offers the option of using one
 * disjoint classes axiom to do this or using multiple disjoint classes axioms
 * to make them pairwise disjoint (for backwards compatibility with OWL 1.0).
 * 
 * @author Matthew Horridge, The University Of Manchester, Bio-Health
 *         Informatics Group, Date: 24-Jul-2007
 */
public class MakeClassesMutuallyDisjoint extends
        AbstractCompositeOntologyChange {

    private final Set classExpressions;
    private final boolean usePairwiseDisjointAxioms;
    private final OWLOntology targetOntology;
    private List changes;

    /**
     * Creates a composite change which makes a set of classes mutually
     * disjoint.
     * 
     * @param dataFactory
     *        The data factory which should be used for creating the axioms
     * @param classExpressions
     *        The class expressions which should be made mutually disjoint.
     * @param usePairwiseDisjointAxioms
     *        {@code true} if multiple disjoint classes axioms should be used to
     *        make the class expressions pairwise disjoint (for backwards
     *        compatibility with OWL 1.0), or {@code false} if one disjoint
     *        classes axiom should be used (preferred OWL 1.1 method).
     * @param targetOntology
     *        The target ontology which the changes will be applied to.
     */
    public MakeClassesMutuallyDisjoint(OWLDataFactory dataFactory,
            Set classExpressions,
            boolean usePairwiseDisjointAxioms, OWLOntology targetOntology) {
        super(dataFactory);
        this.classExpressions = classExpressions;
        this.usePairwiseDisjointAxioms = usePairwiseDisjointAxioms;
        this.targetOntology = targetOntology;
        generateChanges();
    }

    private void generateChanges() {
        changes = new ArrayList();
        if (usePairwiseDisjointAxioms) {
            List descList = new ArrayList(
                    classExpressions);
            for (int i = 0; i < descList.size(); i++) {
                for (int j = i + 1; j < descList.size(); j++) {
                    changes.add(new AddAxiom(targetOntology, getDataFactory()
                            .getOWLDisjointClassesAxiom(
                                    CollectionFactory.createSet(
                                            descList.get(i), descList.get(j)))));
                }
            }
        } else {
            changes.add(new AddAxiom(targetOntology, getDataFactory()
                    .getOWLDisjointClassesAxiom(classExpressions)));
        }
    }

    @Override
    public List getChanges() {
        return changes;
    }
}