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package de.lmu.ifi.dbs.elki.algorithm.clustering.gdbscan;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2012
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 de.lmu.ifi.dbs.elki.data.type.SimpleTypeInformation;
import de.lmu.ifi.dbs.elki.database.Database;
import de.lmu.ifi.dbs.elki.database.ids.DBIDRef;
/**
* Predicate for GeneralizedDBSCAN to evaluate whether a point is a core point
* or not.
*
* Note the Factory/Instance split of this interface.
*
* @author Erich Schubert
*
* @apiviz.has Instance
*/
public interface CorePredicate {
/**
* Constant for the generic type {@code List<? extends DistanceResultPair<?>>}
*/
public static final String NEIGHBOR_LIST = "neighborhood-list";
/**
* Instantiate for a database.
*
* @param database Database to instantiate for
* @param type Type to instantiate for
* @return Instance
*/
public <T> Instance<T> instantiate(Database database, SimpleTypeInformation<?> type);
/**
* Test whether the neighborhood type T is accepted by this predicate.
*
* @param type Type information
* @return true when the type is accepted
*/
public boolean acceptsType(SimpleTypeInformation<?> type);
/**
* Instance for a particular data set.
*
* @author Erich Schubert
*
* @param <T> actual type
*/
public static interface Instance<T> {
/**
* Decide whether the point is a core point, based on its neighborhood.
*
* @param point Query point
* @param neighbors Neighbors
* @return core point property
*/
public boolean isCorePoint(DBIDRef point, T neighbors);
}
}
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