001/*
002 * Units of Measurement API
003 * Copyright (c) 2014-2023, Jean-Marie Dautelle, Werner Keil, Otavio Santana.
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 nor the names of its 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 javax.measure.test.quantity;
031
032import java.math.BigDecimal;
033import java.math.BigInteger;
034import java.util.Objects;
035
036import javax.measure.Quantity;
037import javax.measure.Unit;
038import javax.measure.test.unit.AreaUnit;
039import javax.measure.test.unit.DistanceUnit;
040import javax.measure.test.unit.TimeUnit;
041import javax.measure.test.unit.VolumeUnit;
042
043/**
044 * Singleton class for accessing {@link Quantity} instances.
045 *
046 * @author werner
047 * @author otaviojava
048 * @since 1.0
049 */
050public final class TestQuantities {
051    /**
052     * Private singleton constructor.
053     */
054    private TestQuantities() {
055    }
056
057    /**
058     * Returns the scalar measurement. When the {@link Number} was {@link BigDecimal} or {@link BigInteger} will use DecimalQuantity, when the
059     * {@link Number} was {@link Double} will DoubleQuantity otherwise NumberQuantity. in the specified unit.
060     * @param <Q>
061     *            The type of the quantity.
062     * @param value
063     *          the measurement value.
064     * @param unit
065     *          the measurement unit.
066     * @return the corresponding <code>numeric</code> measurement.
067     * @throws NullPointerException
068     *           when value or unit were null
069     */
070    @SuppressWarnings("unchecked")
071    public static <Q extends Quantity<Q>> Quantity<Q> getQuantity(Number value, Unit<Q> unit) {
072        Objects.requireNonNull(value);
073        Objects.requireNonNull(unit);
074        if (AreaUnit.class.isInstance(unit)) {
075            return (Quantity<Q>) new AreaQuantity(value, unit);
076        } else if (DistanceUnit.class.isInstance(unit)) {
077            return (Quantity<Q>) new DistanceQuantity(value, unit);
078        } else if (TimeUnit.class.isInstance(unit)) {
079            return (Quantity<Q>) new TimeQuantity(value, unit);
080        } else if (VolumeUnit.class.isInstance(unit)) {
081            return (Quantity<Q>) new VolumeQuantity(value, unit);
082        }
083        return (Quantity<Q>) new DimensionlessQuantity(value, unit);
084    }
085}