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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.change;

import org.semanticweb.owlapi.model.OWLImportsDeclaration;

/**
 * Author: Matthew Horridge

 * Stanford University

 * Bio-Medical Informatics Research Group

 * Date: 27/04/2012
 * 
 *     Instances of this class represent {@link OWLOntologyChangeData} for changes that that are specific to the
 *     addition or removal of import statements to/from an ontology.
 * 
 */
public abstract class ImportChangeData extends OWLOntologyChangeData {
    private static final long serialVersionUID = 30406L;

    private final OWLImportsDeclaration declaration;

    /**
     * Constructs an {@link ImportChangeData} object that describes an {@link org.semanticweb.owlapi.model.ImportChange}
     * based on the {@link OWLImportsDeclaration} specified by the {@code declaration} parameter.
     * @param declaration The {@link OWLImportsDeclaration} that is the focus of some change.  Not {@code null}.
     * @throws NullPointerException if {@code declaration} is {@code null}.
     */
    protected ImportChangeData(OWLImportsDeclaration declaration) {
        if(declaration == null) {
            throw new NullPointerException("declaration must not be null");
        }
        this.declaration = declaration;
    }

    /**
     * Gets the {@link OWLImportsDeclaration} that this change data describes.
     * @return The {@link OWLImportsDeclaration}.  Not {@code null}.
     */
    public OWLImportsDeclaration getDeclaration() {
        return declaration;
    }
}