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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 org.unitConverter.newUnits;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import org.unitConverter.dimension.BaseDimension;
import org.unitConverter.math.ObjectProduct;
/**
* @author Adrien Hopkins
* @since 2019-10-16
*/
public abstract class AbstractUnit implements Unit {
/**
* The combination of units that this unit is based on.
*/
private final ObjectProduct<BaseUnit> unitBase;
/**
* Cache storing the result of getDimension()
*/
private transient ObjectProduct<BaseDimension> dimension = null;
/**
* Creates the {@code AbstractUnit}.
*
* @param unitBase
* @since 2019-10-16
* @throws NullPointerException
* if unitBase is null
*/
public AbstractUnit(final ObjectProduct<BaseUnit> unitBase) {
this.unitBase = Objects.requireNonNull(unitBase, "unitBase must not be null.");
}
/**
* @return unitBase
* @since 2019-10-16
*/
@Override
public final ObjectProduct<BaseUnit> getBase() {
return this.unitBase;
}
@Override
public final ObjectProduct<BaseDimension> getDimension() {
if (this.dimension == null) {
final Map<BaseUnit, Integer> mapping = this.unitBase.exponentMap();
final Map<BaseDimension, Integer> dimensionMap = new HashMap<>();
for (final BaseUnit key : mapping.keySet()) {
dimensionMap.put(key.getBaseDimension(), mapping.get(key));
}
this.dimension = ObjectProduct.fromExponentMapping(dimensionMap);
}
return this.dimension;
}
@Override
public String toString() {
return "Unit derived from base " + this.getBase().toString();
}
}
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