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package de.lmu.ifi.dbs.elki.math.statistics.distribution;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2015
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.Random;
import de.lmu.ifi.dbs.elki.math.random.RandomFactory;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.AbstractParameterizer;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.OptionID;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameterization.Parameterization;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.RandomParameter;
/**
* Abstract base class for distributions.
*
* @author Erich Schubert
*/
public abstract class AbstractDistribution implements Distribution {
/**
* Random source.
*/
final protected Random random;
/**
* Constructor.
*
* @param rnd Random source
*/
public AbstractDistribution(RandomFactory rnd) {
super();
this.random = rnd.getRandom();
}
/**
* Constructor.
*
* @param rnd Random source
*/
public AbstractDistribution(Random rnd) {
super();
this.random = rnd;
}
@Override
public double nextRandom() {
return quantile(random.nextDouble());
}
/**
* Parameterization class.
*
* @author Erich Schubert
*
* @apiviz.exclude
*/
public abstract static class Parameterizer extends AbstractParameterizer {
/**
* Parameter to specify the random seeding source.
*/
public static final OptionID RANDOM_ID = new OptionID("distribution.random", "Random generation data source.");
/**
* Location parameter.
*/
public static final OptionID LOCATION_ID = new OptionID("distribution.location", "Distribution location parameter");
/**
* Scale parameter.
*/
public static final OptionID SCALE_ID = new OptionID("distribution.scale", "Distribution scale parameter");
/**
* Shape parameter.
*/
public static final OptionID SHAPE_ID = new OptionID("distribution.shape", "Distribution shape parameter");
/**
* Random source.
*/
RandomFactory rnd;
@Override
protected void makeOptions(Parameterization config) {
super.makeOptions(config);
RandomParameter randomP = new RandomParameter(RANDOM_ID);
if (config.grab(randomP)) {
rnd = randomP.getValue();
}
}
@Override
abstract protected Distribution makeInstance();
}
}
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