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package de.lmu.ifi.dbs.elki.data.model;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2014
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.NumberVector;
import de.lmu.ifi.dbs.elki.database.relation.Relation;
import de.lmu.ifi.dbs.elki.math.linearalgebra.Vector;
import de.lmu.ifi.dbs.elki.utilities.datastructures.arraylike.ArrayLikeUtil;
/**
* Utility classes for dealing with cluster models.
*
* @author Erich Schubert
*
* @apiviz.uses Model
* @apiviz.uses NumberVector
*/
public final class ModelUtil {
/**
* Get (and convert!) the representative vector for a cluster model.
*
* <b>Only representative-based models are supported!</b>
*
* {@code null} is returned when the model is not supported!
*
* @param model Model
* @param relation Data relation (for representatives specified per DBID)
* @param factory Vector factory, for type conversion.
* @return Vector of type V, {@code null} if not supported.
* @param <V> desired vector type
*/
@SuppressWarnings("unchecked")
public static <V extends NumberVector> V getPrototype(Model model, Relation<? extends V> relation, NumberVector.Factory<V> factory) {
// Mean model contains a numeric Vector
if(model instanceof MeanModel) {
final Vector p = ((MeanModel) model).getMean();
if(factory.getRestrictionClass().isInstance(p)) {
return (V) p;
}
return factory.newNumberVector(p.getArrayRef());
}
// Handle medoid models
if(model instanceof MedoidModel) {
NumberVector p = relation.get(((MedoidModel) model).getMedoid());
if(factory.getRestrictionClass().isInstance(p)) {
return (V) p;
}
return factory.newNumberVector(p, ArrayLikeUtil.NUMBERVECTORADAPTER);
}
if(model instanceof PrototypeModel) {
Object p = ((PrototypeModel<?>) model).getPrototype();
if(factory.getRestrictionClass().isInstance(p)) {
return (V) p;
}
if(p instanceof NumberVector) {
return factory.newNumberVector((NumberVector) p, ArrayLikeUtil.NUMBERVECTORADAPTER);
}
return null; // Inconvertible
}
return null;
}
/**
* Get (and convert!) the representative vector for a cluster model.
*
* <b>Only representative-based models are supported!</b>
*
* {@code null} is returned when the model is not supported!
*
* @param model Model
* @param relation Data relation (for representatives specified per DBID)
* @return Some {@link NumberVector}, {@code null} if not supported.
*/
public static NumberVector getPrototype(Model model, Relation<? extends NumberVector> relation) {
// Mean model contains a numeric Vector
if(model instanceof MeanModel) {
return ((MeanModel) model).getMean();
}
// Handle medoid models
if(model instanceof MedoidModel) {
return relation.get(((MedoidModel) model).getMedoid());
}
if(model instanceof PrototypeModel) {
Object p = ((PrototypeModel<?>) model).getPrototype();
if(p instanceof NumberVector) {
return (NumberVector) p;
}
return null; // Inconvertible
}
return null;
}
}
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