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package de.lmu.ifi.dbs.elki.utilities.scaling;
/*
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 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.DoubleParameter;
/**
* Scale implementing a simple clipping. Values less than the specified minimum
* will be set to the minimum, values larger than the maximum will be set to the
* maximum.
*
* @author Erich Schubert
*/
public class ClipScaling implements StaticScalingFunction {
/**
* Parameter to specify a fixed minimum to use.
* <p>
* Key: {@code -clipscale.min}
* </p>
*/
public static final OptionID MIN_ID = new OptionID("clipscale.min", "Minimum value to allow.");
/**
* Parameter to specify the maximum value
* <p>
* Key: {@code -clipscale.max}
* </p>
*/
public static final OptionID MAX_ID = new OptionID("clipscale.max", "Maximum value to allow.");
/**
* Field storing the minimum to use
*/
private Double min = null;
/**
* Field storing the maximum to use
*/
private Double max = null;
/**
* Constructor.
*
* @param min Minimum, may be null
* @param max Maximum, may be null
*/
public ClipScaling(Double min, Double max) {
super();
this.min = min;
this.max = max;
}
@Override
public double getScaled(double value) {
if(min != null && value < min) {
return min;
}
if(max != null && value > max) {
return max;
}
return value;
}
@Override
public double getMin() {
return (min != null) ? min : Double.NEGATIVE_INFINITY;
}
@Override
public double getMax() {
return (max != null) ? max : Double.POSITIVE_INFINITY;
}
/**
* Parameterization class.
*
* @author Erich Schubert
*
* @apiviz.exclude
*/
public static class Parameterizer extends AbstractParameterizer {
protected Double min = null;
protected Double max = null;
@Override
protected void makeOptions(Parameterization config) {
super.makeOptions(config);
DoubleParameter minP = new DoubleParameter(MIN_ID);
minP.setOptional(true);
if(config.grab(minP)) {
min = minP.getValue();
}
DoubleParameter maxP = new DoubleParameter(MAX_ID);
maxP.setOptional(true);
if (config.grab(maxP)) {
max = maxP.getValue();
}
}
@Override
protected ClipScaling makeInstance() {
return new ClipScaling(min, max);
}
}
}
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