/*
* (c) Copyright 2010 by Volker Bergmann. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, is permitted under the terms of the
* GNU General Public License (GPL).
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
* REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
* HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package org.databene.benerator.primitive.number;
import org.databene.commons.ConversionException;
import org.databene.commons.converter.NumberToNumberConverter;
import org.databene.commons.converter.ThreadSafeConverter;
/**
* Quantizes floating point numbers ({@link Double} or {@link Float})
* to be <code>min</code> plus an integral multiple of <code>granularity</code>.<br/><br/>
* Created: 15.03.2010 15:35:05
* @since 0.6.0
* @author Volker Bergmann
*/
public class FloatingPointQuantizer<E extends Number> extends ThreadSafeConverter<E, E> {
private Double min;
private double granularity;
private NumberToNumberConverter<Double, E> converter;
public FloatingPointQuantizer(Class<E> numberType, Double min, double granularity) {
super(numberType, numberType);
this.min = (min != null ? min : 0.);
this.granularity = granularity;
this.converter = new NumberToNumberConverter<Double, E>(Double.class, numberType);
}
public E convert(E sourceValue) throws ConversionException {
double l = Math.floor((sourceValue.doubleValue() - min) / granularity) * granularity + min;
return converter.convert(l);
}
}