/*
* Copyright 1998-2014 University Corporation for Atmospheric Research/Unidata
*
* Portions of this software were developed by the Unidata Program at the
* University Corporation for Atmospheric Research.
*
* Access and use of this software shall impose the following obligations
* and understandings on the user. The user is granted the right, without
* any fee or cost, to use, copy, modify, alter, enhance and distribute
* this software, and any derivative works thereof, and its supporting
* documentation for any purpose whatsoever, provided that this entire
* notice appears in all copies of the software, derivative works and
* supporting documentation. Further, UCAR requests that the user credit
* UCAR/Unidata in any publications that result from the use of this
* software or in any product that includes this software. The names UCAR
* and/or Unidata, however, may not be used in any advertising or publicity
* to endorse or promote any products or commercial entity unless specific
* written permission is obtained from UCAR/Unidata. The user also
* understands that UCAR/Unidata is not obligated to provide the user with
* any support, consulting, training or assistance of any kind with regard
* to the use, operation and performance of this software nor to provide
* the user with any updates, revisions, new versions or "bug fixes."
*
* THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package ucar.units;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Iterator;
/**
* @author Steven R. Emmerson
*/
public class UnitSystemImpl implements UnitSystem, Serializable {
private static final long serialVersionUID = 1L;
/**
* The quantity-to-base-unit map.
*
* @serial
*/
private final HashMap<BaseQuantity, BaseUnit> quantityMap;
/**
* The base unit database;
*
* @serial
*/
private final UnitDB baseUnitDB;
/**
* The complete database;
*
* @serial
*/
private final UnitDBImpl acceptableUnitDB;
/**
* Constructs from a base unit database and a derived unit database.
*
* @param baseUnitDB
* The base unit database. Shall only contain base units.
* @param derivedUnitDB
* The derived unit database. Shall not contain any base units.
* @throws UnitExistsException
* A unit with the same identifier exists in both databases.
*/
protected UnitSystemImpl(final UnitDBImpl baseUnitDB,
final UnitDBImpl derivedUnitDB) throws UnitExistsException {
quantityMap = new HashMap<BaseQuantity, BaseUnit>(baseUnitDB
.nameCount());
for (final Iterator<?> iter = baseUnitDB.getIterator(); iter.hasNext();) {
final Unit unit = (Unit) iter.next();
final BaseUnit baseUnit = (BaseUnit) unit;
quantityMap.put(baseUnit.getBaseQuantity(), baseUnit);
}
this.baseUnitDB = baseUnitDB;
acceptableUnitDB = new UnitDBImpl(baseUnitDB.nameCount()
+ derivedUnitDB.nameCount(), baseUnitDB.symbolCount()
+ derivedUnitDB.symbolCount());
acceptableUnitDB.add(baseUnitDB);
acceptableUnitDB.add(derivedUnitDB);
}
/**
* Returns the base unit database.
*
* @return The base unit database.
*/
public final UnitDB getBaseUnitDB() {
return baseUnitDB;
}
/**
* Returns the complete unit database.
*
* @return The complete unit database (both base units and derived units).
*/
public final UnitDB getUnitDB() {
return acceptableUnitDB;
}
/**
* Returns the base unit corresponding to a base quantity.
*
* @param quantity
* The base quantity.
* @return The base unit corresponding to the base quantity in this system
* of units or <code>
* null</code> if no such unit exists.
*/
public final BaseUnit getBaseUnit(final BaseQuantity quantity) {
return quantityMap.get(quantity);
}
}