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.quantity;
031
032import java.math.BigDecimal;
033import java.math.BigInteger;
034import java.util.Objects;
035
036import javax.measure.Quantity;
037import javax.measure.Unit;
038
039import tech.uom.impl.enums.unit.TimeUnit;
040
041
042/**
043 * Singleton class for accessing {@link Quantity} instances.
044 *
045 * @author werner
046 * @author otaviojava
047 * @since 1.0
048 */
049public final class Quantities {
050  /**
051   * Private singleton constructor.
052   */
053  private Quantities() {
054  }
055
056  /**
057   * Returns the scalar measurement. When the {@link Number} was {@link BigDecimal} or {@link BigInteger} will uses {@link DecimalQuantity}, when the
058   * {@link Number} was {@link Double} will {@link DoubleQuantity} otherwise will {@link NumberQuantity}. in the specified unit.
059   *
060   * @param value
061   *          the measurement value.
062   * @param unit
063   *          the measurement unit.
064   * @return the corresponding <code>numeric</code> measurement.
065   * @throws NullPointerException
066   *           when value or unit were null
067   */
068  @SuppressWarnings("unchecked")
069  public static <Q extends Quantity<Q>> Quantity<Q> getQuantity(Number value, Unit<Q> unit) {
070    Objects.requireNonNull(value);
071    Objects.requireNonNull(unit);
072    if (TemperatureQuantity.class.isInstance(unit)) {
073      return (Quantity<Q>) new TemperatureQuantity(value, unit);
074    } else if (TimeUnit.class.isInstance(unit)) {
075      return (Quantity<Q>) new TimeQuantity(value, unit);
076    }
077    return (Quantity<Q>) new DimensionlessQuantity(value, unit);
078  }
079}