001/*
002 * Units of Measurement Enum Implementation
003 * Copyright © 2005-2021, Werner Keil and others.
004 *
005 * All rights reserved.
006 *
007 * Redistribution and use in source and binary forms, with or without modification,
008 * are permitted provided that the following conditions are met:
009 *
010 * 1. Redistributions of source code must retain the above copyright notice,
011 *    this list of conditions and the following disclaimer.
012 *
013 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions
014 *    and the following disclaimer in the documentation and/or other materials provided with the distribution.
015 *
016 * 3. Neither the name of JSR-385, Unit-API nor the names of their contributors may be used to endorse or promote products
017 *    derived from this software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
020 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
021 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
022 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
023 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
026 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
028 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package tech.uom.impl.enums;
031
032import java.util.HashMap;
033import java.util.Map;
034
035import javax.measure.Quantity;
036import javax.measure.Unit;
037
038/**
039 * This class represents the standard model. 
040 *
041 * @author  <a href="mailto:jean-marie@dautelle.com">Jean-Marie Dautelle</a>
042 * @author  <a href="mailto:units@catmedia.us">Werner Keil</a>
043 * @version 0.5.1, December 20, 2014
044 */
045public class StandardModel extends DimensionalModel {
046
047        private static final StandardModel INSTANCE = new StandardModel();
048        
049    /**
050     * Default constructor.
051     */
052    public StandardModel() {
053    }
054    
055    /**
056     * Returns the singleton instance of this class.
057     *
058     * @return the metric system instance.
059     */
060    public static StandardModel getInstance() {
061        return INSTANCE;
062    }
063
064    @SuppressWarnings("rawtypes")
065        protected final Map<Class<? extends Quantity>, Unit>
066            quantityToUnit = new HashMap<Class<? extends Quantity>, Unit>(); // Diamond (Java 7+)
067    
068    @SuppressWarnings("unchecked")
069    public <Q extends Quantity<Q>> Unit<Q> getUnit(Class<Q> quantityType) {
070        return quantityToUnit.get(quantityType);
071    }
072        
073}