package org.djunits.unit;
   
   import static org.djunits.unit.unitsystem.UnitSystem.OTHER;
   import static org.djunits.unit.unitsystem.UnitSystem.SI_ACCEPTED;
   import static org.djunits.unit.unitsystem.UnitSystem.SI_BASE;
   
   import org.djunits.unit.unitsystem.UnitSystem;
   
   /**
   * Standard duration units.
   * <p>
   * Copyright (c) 2015-2018 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="http://djunits.org/docs/license.html">DJUNITS License</a>.
   * <p>
   * $LastChangedDate: 2017-04-15 02:11:44 +0200 (Sat, 15 Apr 2017) $, @version $Revision: 239 $, by $Author: averbraeck $,
   * initial version May 15, 2014 <br>
   * @author <a href="http://www.tbm.tudelft.nl/averbraeck">Alexander Verbraeck</a>
   */
  public class DurationUnit extends LinearUnit<DurationUnit>
  {
      /** */
      private static final long serialVersionUID = 20140607L;
  
      /** The SI unit for duration is second. */
      public static final DurationUnit SI;
  
      /** second. */
      public static final DurationUnit SECOND;
  
      /** attosecond. */
      public static final DurationUnit ATTOSECOND;
  
      /** femtosecond. */
      public static final DurationUnit FEMTOSECOND;
  
      /** picosecond. */
      public static final DurationUnit PICOSECOND;
  
      /** nanosecond. */
      public static final DurationUnit NANOSECOND;
  
      /** microsecond. */
      public static final DurationUnit MICROSECOND;
  
      /** millisecond. */
      public static final DurationUnit MILLISECOND;
  
      /** minute. */
      public static final DurationUnit MINUTE;
  
      /** hour. */
      public static final DurationUnit HOUR;
  
      /** day. */
      public static final DurationUnit DAY;
  
      /** week. */
      public static final DurationUnit WEEK;
  
      static
      {
          SI = new DurationUnit("DurationUnit.second", "DurationUnit.s", SI_BASE);
          SECOND = SI;
          ATTOSECOND = new DurationUnit("DurationUnit.attosecond", "DurationUnit.as", SI_BASE, SECOND, 1E-18, true);
          FEMTOSECOND = new DurationUnit("DurationUnit.femtosecond", "DurationUnit.fs", SI_BASE, SECOND, 1E-15, true);
          PICOSECOND = new DurationUnit("DurationUnit.picosecond", "DurationUnit.ps", SI_BASE, SECOND, 1E-12, true);
          NANOSECOND = new DurationUnit("DurationUnit.nanosecond", "DurationUnit.ns", SI_BASE, SECOND, 1E-9, true);
          MICROSECOND = new DurationUnit("DurationUnit.microsecond", "DurationUnit.mus", SI_BASE, SECOND, 1E-6, true);
          MILLISECOND = new DurationUnit("DurationUnit.millisecond", "DurationUnit.ms", SI_BASE, SECOND, 1E-3, true);
          MINUTE = new DurationUnit("DurationUnit.minute", "DurationUnit.m", SI_ACCEPTED, SECOND, 60.0, true);
          HOUR = new DurationUnit("DurationUnit.hour", "DurationUnit.h", SI_ACCEPTED, MINUTE, 60.0, true);
          DAY = new DurationUnit("DurationUnit.day", "DurationUnit.d", SI_ACCEPTED, HOUR, 24.0, true);
          WEEK = new DurationUnit("DurationUnit.week", "DurationUnit.w", OTHER, DAY, 7.0, true);
      }
  
      /**
       * Build a standard DurationUnit.
       * @param nameKey the key to the locale file for the long name of the unit
       * @param abbreviationKey the key to the locale file for the abbreviation of the unit
       * @param unitSystem the unit system, e.g. SI or Imperial
       */
      private DurationUnit(final String nameKey, final String abbreviationKey, final UnitSystem unitSystem)
      {
          super(nameKey, abbreviationKey, unitSystem, true);
      }
  
      /**
       * Build a DurationUnit with a conversion factor to another DurationUnit.
       * @param nameOrNameKey if standardUnit: the key to the locale file for the long name of the unit, otherwise the name itself
       * @param abbreviationOrAbbreviationKey if standardUnit: the key to the locale file for the abbreviation of the unit,
       *            otherwise the abbreviation itself
       * @param unitSystem the unit system, e.g. SI or Imperial
       * @param referenceUnit the unit to convert to
       * @param scaleFactorToReferenceUnit multiply a value in this unit by the factor to convert to the given reference unit
       * @param standardUnit indicates whether it is a standard unit with a definition in the locale, or a user-defined unit
       */
      private DurationUnit(final String nameOrNameKey, final String abbreviationOrAbbreviationKey, final UnitSystem unitSystem,
              final DurationUnit referenceUnit, final double scaleFactorToReferenceUnit, final boolean standardUnit)
      {
         super(nameOrNameKey, abbreviationOrAbbreviationKey, unitSystem, referenceUnit, scaleFactorToReferenceUnit,
                 standardUnit);
     }
 
     /**
      * Build a user-defined DurationUnit with a conversion factor to another DurationUnit.
      * @param name the long name of the unit
      * @param abbreviation the abbreviation of the unit
      * @param unitSystem the unit system, e.g. SI or Imperial
      * @param referenceUnit the unit to convert to
      * @param scaleFactorToReferenceUnit multiply a value in this unit by the factor to convert to the given reference unit
      */
     public DurationUnit(final String name, final String abbreviation, final UnitSystem unitSystem,
             final DurationUnit referenceUnit, final double scaleFactorToReferenceUnit)
     {
         this(name, abbreviation, unitSystem, referenceUnit, scaleFactorToReferenceUnit, false);
     }
 
     /** {@inheritDoc} */
     @Override
     public final DurationUnit getStandardUnit()
     {
         return SECOND;
     }
 
     /** {@inheritDoc} */
     @Override
     public final String getSICoefficientsString()
     {
         return "s";
     }
 
 }