SpeedUnit.java
package org.djunits.unit;
import static org.djunits.unit.unitsystem.UnitSystem.IMPERIAL;
import static org.djunits.unit.unitsystem.UnitSystem.SI_DERIVED;
import org.djunits.unit.unitsystem.UnitSystem;
/**
* According to <a href="http://en.wikipedia.org/wiki/Velocity">Wikipedia</a>: Speed describes only how fast an object is
* moving, whereas speed gives both how fast and in what direction the object is moving.
* <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 SpeedUnit extends LinearUnit<SpeedUnit>
{
/** */
private static final long serialVersionUID = 20140607L;
/** The unit of length for the speed unit, e.g., meter. */
private final LengthUnit lengthUnit;
/** The unit of time for the speed unit, e.g., second. */
private final DurationUnit durationUnit;
/** The SI unit for speed is m/s. */
public static final SpeedUnit SI;
/** m/s. */
public static final SpeedUnit METER_PER_SECOND;
/** m/h. */
public static final SpeedUnit METER_PER_HOUR;
/** km/s. */
public static final SpeedUnit KM_PER_SECOND;
/** km/h. */
public static final SpeedUnit KM_PER_HOUR;
/** in/s. */
public static final SpeedUnit INCH_PER_SECOND;
/** in/min. */
public static final SpeedUnit INCH_PER_MINUTE;
/** in/h. */
public static final SpeedUnit INCH_PER_HOUR;
/** ft/s. */
public static final SpeedUnit FOOT_PER_SECOND;
/** ft/min. */
public static final SpeedUnit FOOT_PER_MINUTE;
/** ft/h. */
public static final SpeedUnit FOOT_PER_HOUR;
/** mile/s. */
public static final SpeedUnit MILE_PER_SECOND;
/** mile/min. */
public static final SpeedUnit MILE_PER_MINUTE;
/** mile/h. */
public static final SpeedUnit MILE_PER_HOUR;
/** knot. */
public static final SpeedUnit KNOT;
static
{
SI = new SpeedUnit(LengthUnit.METER, DurationUnit.SECOND, "SpeedUnit.meter_per_second", "SpeedUnit.m/s", SI_DERIVED,
true);
METER_PER_SECOND = SI;
METER_PER_HOUR = new SpeedUnit(LengthUnit.METER, DurationUnit.HOUR, "SpeedUnit.meter_per_hour", "SpeedUnit.m/h",
SI_DERIVED, true);
KM_PER_SECOND = new SpeedUnit(LengthUnit.KILOMETER, DurationUnit.SECOND, "SpeedUnit.kilometer_per_second",
"SpeedUnit.km/s", SI_DERIVED, true);
KM_PER_HOUR = new SpeedUnit(LengthUnit.KILOMETER, DurationUnit.HOUR, "SpeedUnit.kilometer_per_hour", "SpeedUnit.km/h",
SI_DERIVED, true);
INCH_PER_SECOND = new SpeedUnit(LengthUnit.INCH, DurationUnit.SECOND, "SpeedUnit.inch_per_second", "SpeedUnit.in/s",
IMPERIAL, true);
INCH_PER_MINUTE = new SpeedUnit(LengthUnit.INCH, DurationUnit.MINUTE, "SpeedUnit.inch_per_minute", "SpeedUnit.in/min",
IMPERIAL, true);
INCH_PER_HOUR =
new SpeedUnit(LengthUnit.INCH, DurationUnit.HOUR, "SpeedUnit.inch_per_hour", "SpeedUnit.in/h", IMPERIAL, true);
FOOT_PER_SECOND = new SpeedUnit(LengthUnit.FOOT, DurationUnit.SECOND, "SpeedUnit.foot_per_second", "SpeedUnit.fps",
IMPERIAL, true);
FOOT_PER_MINUTE = new SpeedUnit(LengthUnit.FOOT, DurationUnit.MINUTE, "SpeedUnit.foot_per_minute", "SpeedUnit.ft/min",
IMPERIAL, true);
FOOT_PER_HOUR =
new SpeedUnit(LengthUnit.FOOT, DurationUnit.HOUR, "SpeedUnit.foot_per_hour", "SpeedUnit.ft/h", IMPERIAL, true);
MILE_PER_SECOND = new SpeedUnit(LengthUnit.MILE, DurationUnit.SECOND, "SpeedUnit.mile_per_second", "SpeedUnit.mi/s",
IMPERIAL, true);
MILE_PER_MINUTE = new SpeedUnit(LengthUnit.MILE, DurationUnit.MINUTE, "SpeedUnit.mile_per_minute", "SpeedUnit.mi/min",
IMPERIAL, true);
MILE_PER_HOUR =
new SpeedUnit(LengthUnit.MILE, DurationUnit.HOUR, "SpeedUnit.mile_per_hour", "SpeedUnit.mph", IMPERIAL, true);
KNOT = new SpeedUnit(LengthUnit.NAUTICAL_MILE, DurationUnit.HOUR, "SpeedUnit.knot", "SpeedUnit.kt", IMPERIAL, true);
}
/**
* Build a speed unit from a length unit and a time unit.
* @param lengthUnit LengthUnit; the unit of length for the speed unit, e.g., meter
* @param durationUnit DurationUnit; the unit of time for the speed 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 SpeedUnit(final LengthUnit lengthUnit, final DurationUnit durationUnit, final String nameOrNameKey,
final String abbreviationOrAbbreviationKey, final UnitSystem unitSystem, final boolean standardUnit)
{
super(nameOrNameKey, abbreviationOrAbbreviationKey, unitSystem, METER_PER_SECOND,
lengthUnit.getScaleFactor() / durationUnit.getScaleFactor(), standardUnit);
this.lengthUnit = lengthUnit;
this.durationUnit = durationUnit;
}
/**
* Build a user-defined speed unit from a length unit and a time unit.
* @param lengthUnit LengthUnit; the unit of length for the speed unit, e.g., meter
* @param durationUnit DurationUnit; the unit of time for the speed 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 SpeedUnit(final LengthUnit lengthUnit, final DurationUnit durationUnit, final String name, final String abbreviation,
final UnitSystem unitSystem)
{
this(lengthUnit, durationUnit, name, abbreviation, unitSystem, false);
}
/**
* Build a SpeedUnit based on another SpeedUnit.
* @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 SpeedUnit; 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 SpeedUnit(final String nameOrNameKey, final String abbreviationOrAbbreviationKey, final UnitSystem unitSystem,
final SpeedUnit referenceUnit, final double scaleFactorToReferenceUnit, final boolean standardUnit)
{
super(nameOrNameKey, abbreviationOrAbbreviationKey, unitSystem, referenceUnit, scaleFactorToReferenceUnit,
standardUnit);
this.lengthUnit = referenceUnit.getLengthUnit();
this.durationUnit = referenceUnit.getDurationUnit();
}
/**
* Build a user-defined SpeedUnit with a conversion factor to another SpeedUnit.
* @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 SpeedUnit; 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 SpeedUnit(final String name, final String abbreviation, final UnitSystem unitSystem, final SpeedUnit referenceUnit,
final double scaleFactorToReferenceUnit)
{
this(name, abbreviation, unitSystem, referenceUnit, scaleFactorToReferenceUnit, false);
}
/**
* @return lengthUnit
*/
public final LengthUnit getLengthUnit()
{
return this.lengthUnit;
}
/**
* @return durationUnit
*/
public final DurationUnit getDurationUnit()
{
return this.durationUnit;
}
/** {@inheritDoc} */
@Override
public final SpeedUnit getStandardUnit()
{
return METER_PER_SECOND;
}
/** {@inheritDoc} */
@Override
public final String getSICoefficientsString()
{
return "m/s";
}
}