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package de.lmu.ifi.dbs.elki.utilities.datastructures.hierarchy;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2011
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.util.List;
import de.lmu.ifi.dbs.elki.utilities.iterator.IterableIterator;
/**
* Interface for objects with an <b>internal</b> hierarchy interface.
*
* Note that the object can chose to delegate the hierarchy to an external hierarchy.
*
* @author Erich Schubert
*
* @param <O> Object type in hierarchy
*/
public interface Hierarchical<O> {
/**
* Test for hierarchical properties
*
* @return hierarchical data model.
*/
public boolean isHierarchical();
/**
* Get number of children
*
* @return number of children
*/
public int numChildren();
/**
* Get children list. Resulting list MAY be modified. Result MAY be null, if
* the model is not hierarchical.
*
* @return list of children
*/
public List<O> getChildren();
/**
* Iterate descendants (recursive children)
*
* @return iterator for descendants
*/
public IterableIterator<O> iterDescendants();
/**
* Get number of parents
*
* @return number of parents
*/
public int numParents();
/**
* Get parents list. Resulting list MAY be modified. Result MAY be null, if
* the model is not hierarchical.
*
* @return list of parents
*/
public List<O> getParents();
/**
* Iterate ancestors (recursive parents)
*
* @return iterator for ancestors
*/
public IterableIterator<O> iterAncestors();
}
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