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/**
* Copyright (C) 2018 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 org.unitConverter.unit;
import java.util.HashSet;
import java.util.Objects;
import java.util.Set;
import org.unitConverter.dimension.StandardDimensions;
import org.unitConverter.dimension.UnitDimension;
/**
* The SI, which holds all SI units
*
* @author Adrien Hopkins
* @since 2018-12-23
* @since v0.1.0
*/
public enum SI implements UnitSystem {
SI;
/**
* This system's base units.
*
* @since 2019-01-25
* @since v0.1.0
*/
private static final Set<BaseUnit> baseUnits = new HashSet<>();
// base units
public static final BaseUnit METRE = SI.getBaseUnit(StandardDimensions.LENGTH);
public static final BaseUnit KILOGRAM = SI.getBaseUnit(StandardDimensions.MASS);
public static final BaseUnit SECOND = SI.getBaseUnit(StandardDimensions.TIME);
public static final BaseUnit AMPERE = SI.getBaseUnit(StandardDimensions.ELECTRIC_CURRENT);
public static final BaseUnit KELVIN = SI.getBaseUnit(StandardDimensions.TEMPERATURE);
public static final BaseUnit MOLE = SI.getBaseUnit(StandardDimensions.QUANTITY);
public static final BaseUnit CANDELA = SI.getBaseUnit(StandardDimensions.LUMINOUS_INTENSITY);
@Override
public BaseUnit getBaseUnit(final UnitDimension dimension) {
// try to find an existing unit before creating a new one
Objects.requireNonNull(dimension, "dimension must not be null.");
for (final BaseUnit unit : baseUnits) {
// it will be equal since the conditions for equality are dimension and system,
// and system is always SI.
if (unit.getDimension().equals(dimension))
return unit;
}
// could not find an existing base unit
final BaseUnit unit = new BaseUnit(dimension, this);
baseUnits.add(unit);
return unit;
}
@Override
public String getName() {
return "SI";
}
}
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