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/**
* Copyright (C) 2022, 2024, 2025 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.function.Predicate;
/**
* A type of unit, as chosen by the type of system it is in.
* <ul>
* <li>{@code METRIC} refers to metric/SI units that pass {@link Unit#isMetric}
* <li>{@code SEMI_METRIC} refers to the degree Celsius (which is an official SI
* unit but does not pass {@link Unit#isMetric}) and non-metric units intended
* for use with the SI.
* <li>{@code NON_METRIC} refers to units that are neither metric nor intended
* for use with the metric system (e.g. imperial and customary units)
* </ul>
*
* @since 2022-04-10
* @since v0.4.0
*/
public enum UnitType {
/** Units that pass {@link Unit#isMetric} */
METRIC,
/** certain exceptions like the degree Celsius */
SEMI_METRIC,
/** Non-metric, non-excepted units */
NON_METRIC;
/**
* Determines which type a unit is. The type will be:
* <ul>
* <li>{@code SEMI_METRIC} if the unit passes the provided predicate
* <li>{@code METRIC} if it fails the predicate but is metric
* <li>{@code NON_METRIC} if it fails the predicate and is not metric
* </ul>
*
* @param u unit to test
* @param isSemiMetric predicate to determine if a unit is semi-metric
* @return type of unit
* @since 2022-04-18
* @since v0.4.0
*/
public static final UnitType getType(Unit u, Predicate<Unit> isSemiMetric) {
if (isSemiMetric.test(u))
return SEMI_METRIC;
if (u.isMetric())
return METRIC;
return NON_METRIC;
}
}
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