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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.quantity;

import java.util.Objects;

import javax.measure.Quantity;
import javax.measure.Unit;
import javax.measure.format.ParserException;

import tec.units.ri.format.QuantityFormat;

/**
 * Singleton class for accessing {@link Quantity} instances.
 * @author werner
 * @author otaviojava
 * @version 0.5, October 30, 2015
 */
public final class Quantities {
    /**
     * Private singleton constructor.
     */
    private Quantities() {}
    
    /**
     * Returns the
     * {@link #of(Number, javax.measure.Unit) numeric}
     * quantity of unknown type corresponding to the specified representation.
     * This method can be used to parse dimensionless quantities.

     *     Quantity proportion = NumberQuantity.of("0.234").asType(Dimensionless.class);
     * 
     *
     *  Note: This method handles only
     * {@link javax.measure.format.UnitFormat#getStandard standard} unit format
     * (UCUM based). Locale-sensitive
     * measure formatting and parsing are handled by the {@link QuantityFormat}
     * class and its subclasses.
     *
     * @param csq the decimal value and its unit (if any) separated by space(s).
     * @return QuantityFormat.getInstance(LOCALE_NEUTRAL).parse(csq)
     */
    public static Quantity getQuantity(CharSequence csq) {
        try {
            return QuantityFormat.getInstance().parse(csq);
        } catch (IllegalArgumentException | ParserException e) {
            throw new IllegalArgumentException(e); // TODO could we handle this differently?
        }
    }

    /**
     * Returns the scalar measurement.
     * in the specified unit.
     * @param value the measurement value.
     * @param unit the measurement unit.
     * @return the corresponding numeric quantity.
     * @throws NullPointerException when value or unit were null
     */
    public static > Quantity getQuantity(Number value,
            Unit unit) {

        Objects.requireNonNull(value);
        Objects.requireNonNull(unit);
        if (Double.class.isInstance(value)) {
        	return new DoubleQuantity<>(value.doubleValue(), unit);
    	} else if (Long.class.isInstance(value)) {
            return new LongQuantity<>(Long.class.cast(value), unit);
        } else if (Integer.class.isInstance(value)) {
        	return new IntegerQuantity<>(Integer.class.cast(value), unit);
        } else if (Float.class.isInstance(value)) {
            	return new FloatQuantity<>(Float.class.cast(value), unit);
        }
        return new NumberQuantity<>(value, unit);
    }
}