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Units of Measurement Standard - This JSR specifies Java packages for modeling and working with measurement values, quantities and their corresponding units.

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/*
 * Units of Measurement API
 * Copyright (c) 2014-2016, 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 javax.measure.spi;

import java.util.Collection;

/**
 * This interface represents the service to obtain a {@link SystemOfUnits system of units}.
 *
 * 
 * Common system of units are "SI" (System International), "Imperial" (British), "US" (US Customary).
 * 
 *
 * @author Jean-Marie Dautelle
 * @author Werner Keil
 * @version 0.9, July 2, 2016
 */
public interface SystemOfUnitsService {

  /**
   * Returns the default {@link SystemOfUnits system of units}. Depending on the implementation this may be the  International System of Units or another default system.
   *
   * @return the default system of units.
   */
  SystemOfUnits getSystemOfUnits();

  /**
   * Returns the system of units having the specified name or null if none.
   *
   * @param name
   *          the system of unit name.
   * @return the given system of units.
   */
  SystemOfUnits getSystemOfUnits(String name);

  /**
   * Gets a list with available systems for this {@link SystemOfUnitsService}.
   *
   * @return list of available systems of units, never null.
   */
  Collection getAvailableSystemsOfUnits();
}