package org.djunits.unit;
   
   import static org.djunits.unit.unitsystem.UnitSystem.CGS;
   import static org.djunits.unit.unitsystem.UnitSystem.IMPERIAL;
   import static org.djunits.unit.unitsystem.UnitSystem.MTS;
   import static org.djunits.unit.unitsystem.UnitSystem.OTHER;
   import static org.djunits.unit.unitsystem.UnitSystem.SI_DERIVED;
   
   import org.djunits.unit.unitsystem.UnitSystem;
  
  /**
   * The units of pressure.
   * <p>
   * Copyright (c) 2015-2019 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: 2019-01-18 00:35:01 +0100 (Fri, 18 Jan 2019) $, @version $Revision: 324 $, by $Author: averbraeck $,
   * initial version May 15, 2014 <br>
   * @author <a href="http://www.tbm.tudelft.nl/averbraeck">Alexander Verbraeck</a>
   */
  public class PressureUnit extends LinearUnit<PressureUnit>
  {
      /** */
      private static final long serialVersionUID = 20140607L;
  
      /** the unit of mass for the pressure unit, e.g., kilogram. */
      private final MassUnit massUnit;
  
      /** the unit of length for the pressure unit, e.g., meter. */
      private final LengthUnit lengthUnit;
  
      /** the unit of time for the pressure unit, e.g., second. */
      private final DurationUnit durationUnit;
  
      /** The SI unit for pressure is Pascal. */
      public static final PressureUnit SI;
  
      /** Pascal. */
      public static final PressureUnit PASCAL;
  
      /** hectoPascal. */
      public static final PressureUnit HECTOPASCAL;
  
      /** kiloPascal. */
      public static final PressureUnit KILOPASCAL;
  
      /** standard atmosphere. */
      public static final PressureUnit ATMOSPHERE_STANDARD;
  
      /** torr. */
      public static final PressureUnit TORR;
  
      /** technical atmosphere. */
      public static final PressureUnit ATMOSPHERE_TECHNICAL;
  
      /** barye. */
      public static final PressureUnit BARYE;
  
      /** bar. */
      public static final PressureUnit BAR;
  
      /** millibar. */
      public static final PressureUnit MILLIBAR;
  
      /** cm Hg. */
      public static final PressureUnit CENTIMETER_MERCURY;
  
      /** mm Hg. */
      public static final PressureUnit MILLIMETER_MERCURY;
  
      /** foot Hg. */
      public static final PressureUnit FOOT_MERCURY;
  
      /** inch Hg. */
      public static final PressureUnit INCH_MERCURY;
  
      /** kilogram-force per square millimeter. */
      public static final PressureUnit KGF_PER_SQUARE_MM;
  
      /** pound per square foot. */
      public static final PressureUnit POUND_PER_SQUARE_FOOT;
  
      /** pound per square inch. */
      public static final PressureUnit POUND_PER_SQUARE_INCH;
  
      /** pieze. */
      public static final PressureUnit PIEZE;
  
      static
      {
          SI = new PressureUnit(MassUnit.KILOGRAM, LengthUnit.METER, DurationUnit.SECOND, "PressureUnit.pascal",
                  "PressureUnit.Pa", SI_DERIVED, true);
          PASCAL = SI;
          HECTOPASCAL = new PressureUnit("PressureUnit.hectopascal", "PressureUnit.hPa", SI_DERIVED, PASCAL, 100.0, true);
          KILOPASCAL = new PressureUnit("PressureUnit.kilopascal", "PressureUnit.kPa", SI_DERIVED, PASCAL, 1000.0, true);
          ATMOSPHERE_STANDARD =
                  new PressureUnit("PressureUnit.atmosphere_(standard)", "PressureUnit.atm", OTHER, PASCAL, 101325.0, true);
          TORR = new PressureUnit("PressureUnit.torr", "PressureUnit.Torr", OTHER, ATMOSPHERE_STANDARD, 1.0 / 760.0, true);
          ATMOSPHERE_TECHNICAL = new PressureUnit(ForceUnit.KILOGRAM_FORCE, AreaUnit.SQUARE_CENTIMETER,
                 "PressureUnit.atmosphere_(technical)", "PressureUnit.at", OTHER, true);
         BARYE = new PressureUnit(ForceUnit.DYNE, AreaUnit.SQUARE_CENTIMETER, "PressureUnit.barye", "PressureUnit.Ba", CGS,
                 true);
         BAR = new PressureUnit("PressureUnit.bar_(full)", "PressureUnit.bar", OTHER, PASCAL, 1E5, true);
         MILLIBAR = new PressureUnit("PressureUnit.millibar", "PressureUnit.mbar", OTHER, PressureUnit.BAR, 0.001, true);
         CENTIMETER_MERCURY =
                 new PressureUnit("PressureUnit.centimeter_mercury", "PressureUnit.cmHg", OTHER, PASCAL, 1333.224, true);
         MILLIMETER_MERCURY =
                 new PressureUnit("PressureUnit.millimeter_mercury", "PressureUnit.mmHg", OTHER, PASCAL, 133.3224, true);
         FOOT_MERCURY = new PressureUnit("PressureUnit.foot_mercury", "PressureUnit.ftHg", IMPERIAL, PASCAL, 40.63666E3, true);
         INCH_MERCURY = new PressureUnit("PressureUnit.inch_mercury", "PressureUnit.inHg", IMPERIAL, PASCAL, 3.386389E3, true);
         KGF_PER_SQUARE_MM = new PressureUnit(ForceUnit.KILOGRAM_FORCE, AreaUnit.SQUARE_MILLIMETER,
                 "PressureUnit.kilogram-force_per_square_millimeter", "PressureUnit.kgf/mm^2", OTHER, true);
         POUND_PER_SQUARE_FOOT = new PressureUnit(ForceUnit.POUND_FORCE, AreaUnit.SQUARE_FOOT,
                 "PressureUnit.pound_per_square_foot", "PressureUnit.lbf/ft^2", IMPERIAL, true);
         POUND_PER_SQUARE_INCH = new PressureUnit(ForceUnit.POUND_FORCE, AreaUnit.SQUARE_INCH,
                 "PressureUnit.pound_per_square_inch", "PressureUnit.lbf/in^2", IMPERIAL, true);
         PIEZE = new PressureUnit(MassUnit.TONNE, LengthUnit.METER, DurationUnit.SECOND, "PressureUnit.pieze", "PressureUnit.pz",
                 MTS, true);
     }
 
     /**
      * Construct a pressure unit from mass, length and time units, e.g., a Pascal = kg/m.s^2.
      * @param massUnit MassUnit; the unit of mass for the pressure unit, e.g., kilogram
      * @param lengthUnit LengthUnit; the unit of length for the pressure unit, e.g., meter
      * @param durationUnit DurationUnit; the unit of time for the pressure unit, e.g., second
      * @param nameOrNameKey String; if standardUnit: the key to the locale file for the long name of the unit, otherwise the
      *            name itself
      * @param abbreviationOrAbbreviationKey String; if standardUnit: the key to the locale file for the abbreviation of the
      *            unit, otherwise the abbreviation itself
      * @param unitSystem UnitSystem; the unit system, e.g. SI or Imperial
      * @param standardUnit boolean; indicates whether it is a standard unit with a definition in the locale, or a user-defined
      *            unit
      */
     private PressureUnit(final MassUnit massUnit, final LengthUnit lengthUnit, final DurationUnit durationUnit,
             final String nameOrNameKey, final String abbreviationOrAbbreviationKey, final UnitSystem unitSystem,
             final boolean standardUnit)
     {
         super(nameOrNameKey, abbreviationOrAbbreviationKey, unitSystem, PASCAL,
                 massUnit.getScaleFactor()
                         / (lengthUnit.getScaleFactor() * durationUnit.getScaleFactor() * durationUnit.getScaleFactor()),
                 standardUnit);
         this.massUnit = massUnit;
         this.lengthUnit = lengthUnit;
         this.durationUnit = durationUnit;
     }
 
     /**
      * Construct a user-defined pressure unit from mass, length and time units, e.g., a Pascal = kg/m.s^2.
      * @param massUnit MassUnit; the unit of mass for the pressure unit, e.g., kilogram
      * @param lengthUnit LengthUnit; the unit of length for the pressure unit, e.g., meter
      * @param durationUnit DurationUnit; the unit of time for the pressure unit, e.g., second
      * @param name String; the long name of the unit
      * @param abbreviation String; the abbreviation of the unit
      * @param unitSystem UnitSystem; the unit system, e.g. SI or Imperial
      */
     public PressureUnit(final MassUnit massUnit, final LengthUnit lengthUnit, final DurationUnit durationUnit,
             final String name, final String abbreviation, final UnitSystem unitSystem)
     {
         this(massUnit, lengthUnit, durationUnit, name, abbreviation, unitSystem, false);
     }
 
     /**
      * Construct a pressure unit from force and area units, e.g. a Pascal = N/m^2.
      * @param forceUnit ForceUnit; the unit of force for the pressure unit, e.g., Newton
      * @param areaUnit AreaUnit; the unit of area for the pressure unit, e.g., m^2
      * @param nameOrNameKey String; if standardUnit: the key to the locale file for the long name of the unit, otherwise the
      *            name itself
      * @param abbreviationOrAbbreviationKey String; if standardUnit: the key to the locale file for the abbreviation of the
      *            unit, otherwise the abbreviation itself
      * @param unitSystem UnitSystem; the unit system, e.g. SI or Imperial
      * @param standardUnit boolean; indicates whether it is a standard unit with a definition in the locale, or a user-defined
      *            unit
      */
     private PressureUnit(final ForceUnit forceUnit, final AreaUnit areaUnit, final String nameOrNameKey,
             final String abbreviationOrAbbreviationKey, final UnitSystem unitSystem, final boolean standardUnit)
     {
         super(nameOrNameKey, abbreviationOrAbbreviationKey, unitSystem, PASCAL,
                 forceUnit.getScaleFactor() / areaUnit.getScaleFactor(), standardUnit);
         this.massUnit = forceUnit.getMassUnit();
         this.lengthUnit = areaUnit.getLengthUnit();
         this.durationUnit = forceUnit.getDurationUnit();
     }
 
     /**
      * Construct a user-defined pressure unit from force and area units, e.g. a Pascal = N/m^2.
      * @param forceUnit ForceUnit; the unit of force for the pressure unit, e.g., Newton
      * @param areaUnit AreaUnit; the unit of area for the pressure unit, e.g., m^2
      * @param name String; the long name of the unit
      * @param abbreviation String; the abbreviation of the unit
      * @param unitSystem UnitSystem; the unit system, e.g. SI or Imperial
      */
     public PressureUnit(final ForceUnit forceUnit, final AreaUnit areaUnit, final String name, final String abbreviation,
             final UnitSystem unitSystem)
     {
         this(forceUnit, areaUnit, name, abbreviation, unitSystem, false);
     }
 
     /**
      * Build a PressureUnit with a conversion factor to another PressureUnit.
      * @param nameOrNameKey String; if standardUnit: the key to the locale file for the long name of the unit, otherwise the
      *            name itself
      * @param abbreviationOrAbbreviationKey String; if standardUnit: the key to the locale file for the abbreviation of the
      *            unit, otherwise the abbreviation itself
      * @param unitSystem UnitSystem; the unit system, e.g. SI or Imperial
      * @param referenceUnit PressureUnit; the unit to convert to
      * @param scaleFactorToReferenceUnit double; multiply a value in this unit by the factor to convert to the given reference
      *            unit
      * @param standardUnit boolean; indicates whether it is a standard unit with a definition in the locale, or a user-defined
      *            unit
      */
     private PressureUnit(final String nameOrNameKey, final String abbreviationOrAbbreviationKey, final UnitSystem unitSystem,
             final PressureUnit referenceUnit, final double scaleFactorToReferenceUnit, final boolean standardUnit)
     {
         super(nameOrNameKey, abbreviationOrAbbreviationKey, unitSystem, referenceUnit, scaleFactorToReferenceUnit,
                 standardUnit);
         this.massUnit = referenceUnit.getMassUnit();
         this.lengthUnit = referenceUnit.getLengthUnit();
         this.durationUnit = referenceUnit.getDurationUnit();
     }
 
     /**
      * Build a user-defined PressureUnit with a conversion factor to another PressureUnit.
      * @param name String; the long name of the unit
      * @param abbreviation String; the abbreviation of the unit
      * @param unitSystem UnitSystem; the unit system, e.g. SI or Imperial
      * @param referenceUnit PressureUnit; the unit to convert to
      * @param scaleFactorToReferenceUnit double; multiply a value in this unit by the factor to convert to the given reference
      *            unit
      */
     public PressureUnit(final String name, final String abbreviation, final UnitSystem unitSystem,
             final PressureUnit referenceUnit, final double scaleFactorToReferenceUnit)
     {
         this(name, abbreviation, unitSystem, referenceUnit, scaleFactorToReferenceUnit, false);
     }
 
     /**
      * @return massUnit
      */
     public final MassUnit getMassUnit()
     {
         return this.massUnit;
     }
 
     /**
      * @return lengthUnit
      */
     public final LengthUnit getLengthUnit()
     {
         return this.lengthUnit;
     }
 
     /**
      * @return durationUnit
      */
     public final DurationUnit getDurationUnit()
     {
         return this.durationUnit;
     }
 
     /** {@inheritDoc} */
     @Override
     public final PressureUnit getStandardUnit()
     {
         return PASCAL;
     }
 
     /** {@inheritDoc} */
     @Override
     public final String getSICoefficientsString()
     {
         return "kg/ms2";
     }
 
 }