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Unit Standard (JSR 363) Reference Implementation.

There is a newer version: 1.0.3

/*
 * 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.internal.quantity;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

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

import tec.units.ri.quantity.DefaultQuantityFactory;

/**
 * Provider of Quantities
 * @author Werner Keil
 * @version 0.3
 */
@SuppressWarnings("rawtypes")
public final class DefaultQuantityFactoryService implements QuantityFactoryService {
    private final Map INSTANCE = new HashMap();

    /**
     * Return a factory for this quantity
     * @param quantity the quantity type
     * @return the {@link QuantityFactory}
     * @throws NullPointerException
     */
    @SuppressWarnings("unchecked")
    public final >  QuantityFactory getQuantityFactory(Class quantity){
        Objects.requireNonNull(quantity);
        if(!INSTANCE.containsKey(quantity)) {
            synchronized (INSTANCE) {
                INSTANCE.put(quantity, DefaultQuantityFactory.getInstance(quantity));
            }
        }
        return INSTANCE.get(quantity);
    }
}