001/**
002 * Copyright (C) 2007 - 2016, Jens Lehmann
003 *
004 * This file is part of DL-Learner.
005 *
006 * DL-Learner is free software; you can redistribute it and/or modify
007 * it under the terms of the GNU General Public License as published by
008 * the Free Software Foundation; either version 3 of the License, or
009 * (at your option) any later version.
010 *
011 * DL-Learner is distributed in the hope that it will be useful,
012 * but WITHOUT ANY WARRANTY; without even the implied warranty of
013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
014 * GNU General Public License for more details.
015 *
016 * You should have received a copy of the GNU General Public License
017 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
018 */
019package org.dllearner.core.owl;
020
021import java.util.SortedSet;
022
023import org.semanticweb.owlapi.model.OWLObject;
024
025/**
026 * @author Lorenz Buehmann
027 *
028 */
029public interface Hierarchy<T extends OWLObject> {
030
031        SortedSet<T> getChildren(T entity);
032
033        SortedSet<T> getChildren(T entity, boolean direct);
034        
035        SortedSet<T> getParents(T entity);
036
037        SortedSet<T> getParents(T entity, boolean direct);
038
039        SortedSet<T> getSiblings(T entity);
040
041        boolean isChildOf(T entity1, T entity2);
042
043        boolean isParentOf(T entity1, T entity2);
044
045        SortedSet<T> getRoots();
046
047        /**
048         * Checks whether the entity is contained in the hierarchy.
049         * @param entity the entity
050         * @return whether the entity is contained in the hierarchy or not
051         */
052        boolean contains(T entity);
053
054}