tec.uom.se.function.MultiplyConverter Maven / Gradle / Ivy
/*
* Units of Measurement Implementation for Java SE
* Copyright (c) 2005-2018, Jean-Marie Dautelle, Werner Keil, Otavio Santana.
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions
* and the following disclaimer in the documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of JSR-363 nor the names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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 tec.uom.se.function;
import javax.measure.UnitConverter;
import tec.uom.lib.common.function.DoubleFactorSupplier;
import tec.uom.lib.common.function.ValueSupplier;
import tec.uom.se.AbstractConverter;
import java.math.BigDecimal;
import java.math.MathContext;
import java.util.Objects;
/**
*
* This class represents a converter multiplying numeric values by a constant scaling factor (double
based).
*
*
* @author Jean-Marie Dautelle
* @author Werner Keil
* @version 1.0, Oct 11, 2016
* @since 1.0
*/
public final class MultiplyConverter extends AbstractConverter implements ValueSupplier, DoubleFactorSupplier {
/**
*
*/
private static final long serialVersionUID = 6588759878444545649L;
/**
* Holds the scale factor.
*/
private double factor;
/**
* Creates a multiply converter with the specified scale factor.
*
* @param factor
* the scaling factor.
* @throws IllegalArgumentException
* if coefficient is 1.0
(would result in identity converter)
*/
public MultiplyConverter(double factor) {
if (factor == 1.0)
throw new IllegalArgumentException("Would result in identity converter");
this.factor = factor;
}
/**
* Returns the scale factor of this converter.
*
* @return the scale factor.
*/
public double getFactor() {
return factor;
}
@Override
public UnitConverter concatenate(UnitConverter converter) {
if (!(converter instanceof MultiplyConverter))
return super.concatenate(converter);
double newfactor = factor * ((MultiplyConverter) converter).factor;
return newfactor == 1.0 ? IDENTITY : new MultiplyConverter(newfactor);
}
@Override
public MultiplyConverter inverse() {
return new MultiplyConverter(1.0 / factor);
}
@Override
public double convert(double value) {
return value * factor;
}
@Override
public BigDecimal convert(BigDecimal value, MathContext ctx) throws ArithmeticException {
return value.multiply(BigDecimal.valueOf(factor), ctx);
}
@Override
public final String toString() {
return MultiplyConverter.class.getSimpleName() + "(" + factor + ")";
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof MultiplyConverter) {
MultiplyConverter that = (MultiplyConverter) obj;
return Objects.equals(factor, that.factor);
}
return false;
}
@Override
public int hashCode() {
return Objects.hashCode(factor);
}
@Override
public boolean isLinear() {
return true;
}
@Override
public Double getValue() {
return factor;
}
}