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Re-packaged Unidata udUnits

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/*
 * Copyright (c) 1998-2018 University Corporation for Atmospheric Research/Unidata
 * See LICENSE for license information.
 */
package ucar.units;

/**
 * Interface for a system of units.
 *
 * @author Steven R. Emmerson
 */
public interface UnitSystem {
  /**
   * Returns the database of base units.
   * 
   * @return The database of base units.
   */
  UnitDB getBaseUnitDB();

  /**
   * Returns the complete database of units (base units and
   * derived units acceptable for use in the system of units.
   * 
   * @return The complete database of units.
   */
  UnitDB getUnitDB();

  /**
   * Returns the base unit corresponding to a base quantity.
   * 
   * @param quantity A base quantity.
   * @return The base unit corresponding to the base
   *         quantity or null if no such
   *         unit exists.
   */
  BaseUnit getBaseUnit(BaseQuantity quantity);
}