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Unit Standard (JSR 363) Reference Implementation.
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/*
 * Units of Measurement Reference Implementation
 * Copyright (c) 2005-2015, Jean-Marie Dautelle, Werner Keil, V2COM.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions
 *    and the following disclaimer in the documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of JSR-363 nor the names of its contributors may be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package tec.units.ri.quantity;

import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.measure.Quantity;
import javax.measure.Unit;
import javax.measure.spi.QuantityFactory;

import tec.units.ri.AbstractQuantity;

/**
 * A factory producing simple quantities instances (tuples {@link Number}/{@link Unit}).
 *
 * For example:

 *      Mass m = DefaultQuantityFactory.getInstance(Mass.class).create(23.0, KILOGRAM); // 23.0 kg

 *      Time m = DefaultQuantityFactory.getInstance(Time.class).create(124, MILLI(SECOND)); // 124 ms
 * 
 * @param  The type of the quantity.
 *
 * @author  Martin Desruisseaux
 * @author  Werner Keil
 * @author  Jean-Marie Dautelle
 * @version 0.7, $Date: 2015-09-27 $
 */
abstract class AbstractQuantityFactory> implements QuantityFactory  {

    /**
     * Holds the current instances.
     */
    @SuppressWarnings("rawtypes")
    static final Map INSTANCES = new HashMap();

    static final Logger logger = Logger.getLogger(AbstractQuantityFactory.class.getName());

    static final Level LOG_LEVEL = Level.FINE;


    /**
     * Overrides the default implementation of the factory for the specified
     * quantity type.
     *
     * @param  The type of the quantity
     * @param type the quantity type
     * @param factory the quantity factory
     */
    protected static >  void setInstance(final Class type, AbstractQuantityFactory factory) {
        if (!AbstractQuantity.class.isAssignableFrom(type))
            // This exception is not documented because it should never happen if the
            // user don't try to trick the Java generic types system with unsafe cast.
            throw new ClassCastException();
        INSTANCES.put(type, factory);
    }

    /**
     * Returns the quantity for the specified number stated in the specified unit.
     *
     * @param value the numeric value stated in the specified unit
     * @param unit the unit
     * @return the corresponding quantity
     */
    public abstract Quantity create(Number value, Unit unit);
//    public abstract > Q create(N number, U unit);
}