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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.Collections;
import java.util.Set;

/**
 * @author Matthew Horridge, The University of Manchester, Information Management
 *         Group, Date: 18-Mar-2009
 */
public abstract class ImportChange extends OWLOntologyChange {

    private final OWLImportsDeclaration declaration;

    /**
     * @param ont
     *        the ontology to which the change is to be applied
     * @param importDeclaration
     *        the import declaration
     */
    public ImportChange(OWLOntology ont, OWLImportsDeclaration importDeclaration) {
        super(ont);
        declaration = importDeclaration;
    }

    /**
     * Gets the import declaration that the change pertains to.
     * 
     * @return The import declaration
     */
    public OWLImportsDeclaration getImportDeclaration() {
        return declaration;
    }

    @Override
    public Set getSignature() {
        return Collections.emptySet();
    }

    @Override
    public boolean isImportChange() {
        return true;
    }

    @Override
    public boolean isAxiomChange() {
        return false;
    }

    @Override
    public boolean isAddAxiom() {
        return false;
    }

    @Override
    public OWLAxiom getAxiom() {
        throw new UnsupportedOperationException("Not an axiom");
    }
}