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/**
* Copyright (C) 2019 Adrien Hopkins
*
* 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 <https://www.gnu.org/licenses/>.
*/
package sevenUnits.unit;
import java.util.Objects;
import java.util.function.DoubleUnaryOperator;
import sevenUnits.utils.NameSymbol;
import sevenUnits.utils.ObjectProduct;
/**
* A unit that uses functional objects to convert to and from its base.
*
* @author Adrien Hopkins
* @since 2019-05-22
*/
final class FunctionalUnit extends Unit {
/**
* A function that accepts a value expressed in the unit's base and returns
* that value expressed in this unit.
*
* @since 2019-05-22
*/
private final DoubleUnaryOperator converterFrom;
/**
* A function that accepts a value expressed in the unit and returns that
* value expressed in the unit's base.
*
* @since 2019-05-22
*/
private final DoubleUnaryOperator converterTo;
/**
* Creates the {@code FunctionalUnit}.
*
* @param base unit's base
* @param converterFrom function that accepts a value expressed in the unit's
* base and returns that value expressed in this unit.
* @param converterTo function that accepts a value expressed in the unit
* and returns that value expressed in the unit's base.
* @throws NullPointerException if any argument is null
* @since 2019-05-22
*/
public FunctionalUnit(final ObjectProduct<BaseUnit> base,
final DoubleUnaryOperator converterFrom,
final DoubleUnaryOperator converterTo) {
super(base, NameSymbol.EMPTY);
this.converterFrom = Objects.requireNonNull(converterFrom,
"converterFrom must not be null.");
this.converterTo = Objects.requireNonNull(converterTo,
"converterTo must not be null.");
}
/**
* Creates the {@code FunctionalUnit}.
*
* @param base unit's base
* @param converterFrom function that accepts a value expressed in the unit's
* base and returns that value expressed in this unit.
* @param converterTo function that accepts a value expressed in the unit
* and returns that value expressed in the unit's base.
* @throws NullPointerException if any argument is null
* @since 2019-05-22
*/
public FunctionalUnit(final ObjectProduct<BaseUnit> base,
final DoubleUnaryOperator converterFrom,
final DoubleUnaryOperator converterTo, final NameSymbol ns) {
super(base, ns);
this.converterFrom = Objects.requireNonNull(converterFrom,
"converterFrom must not be null.");
this.converterTo = Objects.requireNonNull(converterTo,
"converterTo must not be null.");
}
/**
* {@inheritDoc}
*
* Uses {@code converterFrom} to convert.
*/
@Override
public double convertFromBase(final double value) {
return this.converterFrom.applyAsDouble(value);
}
/**
* {@inheritDoc}
*
* Uses {@code converterTo} to convert.
*/
@Override
public double convertToBase(final double value) {
return this.converterTo.applyAsDouble(value);
}
}
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