Unit (DJUNITS 3.00.07 API)

java.lang.Object
- org.djunits.unit.Unit<U>

Type Parameters:

U - the unit for transformation reasons

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

AngleUnit, DimensionlessUnit, LinearUnit, SIUnit
```
public abstract class Unit<U extends Unit<U>>
extends Object
implements Serializable
```
All units are internally stored relative to a standard unit with conversion factor. This means that e.g., a meter is stored with conversion factor 1.0, whereas kilometer is stored with a conversion factor 1000.0. This means that if we want to express a length meter in kilometers, we have to divide by the conversion factor.
Copyright (c) 2015-2018 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved.
BSD-style license. See DJUNITS License.
$LastChangedDate: 2018-08-10 10:39:38 +0200 (Fri, 10 Aug 2018) $, @version $Revision: 287 $, by $Author: averbraeck $, initial version May 15, 2014

Author:

Alexander Verbraeck

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type Field and Description

static String[] STANDARD_UNITS
The array of the names of the standard units.

Fields
Modifier and Type	Field and Description
`static String[]`	`STANDARD_UNITS` The array of the names of the standard units.

Constructor Summary

Constructors
Modifier	Constructor and Description
`protected`	`Unit(String nameOrNameKey, String abbreviationOrAbbreviationKey, UnitSystem unitSystem, boolean standardUnit)` Build a standard unit and create the fields for a unit.
`protected`	`Unit(String nameOrNameKey, String abbreviationOrAbbreviationKey, UnitSystem unitSystem, Scale scale, boolean standardUnit)` Build a unit with a specific conversion scale to/from the standard unit.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`equals(Object obj)`
`abstract boolean`	`equalsIgnoreNaming(Object obj)` Test if two units are the same, except for the name and abbreviation.
`int`	`generateHashCode()` Generate a hashCode for caching.
`String`	`getAbbreviation()`
`String`	`getAbbreviationKey()` This method returns the abbreviation key, or null in case the abbreviation is hard coded.
`Set<Unit<U>>`	`getAllUnitsOfThisType()` Return a copy of the set of all defined units for this unit type.
`String`	`getName()`
`String`	`getNameKey()` This method returns the name key, or null in case the name is hard coded.
`Scale`	`getScale()`
`SICoefficients`	`getSICoefficients()`
`abstract String`	`getSICoefficientsString()`
`abstract U`	`getStandardUnit()`
`static <V extends Unit<V>> Set<V>`	`getUnits(Class<V> unitClass)` Return a set of defined units for a given unit type.
`UnitSystem`	`getUnitSystem()`
`int`	`hashCode()`
`boolean`	`isBaseSIUnit()` Determine whether this unit is the standard unit.
`boolean`	`isLocalizable()` Report if this unit support localization.
`static SIUnit`	`lookupOrCreateSIUnitWithSICoefficients(String normalizedSICoefficientsString)`
`static Set<Unit<?>>`	`lookupOrCreateUnitWithSICoefficients(String normalizedSICoefficientsString)`
`static Set<Unit<?>>`	`lookupUnitWithSICoefficients(String normalizedSICoefficientsString)`
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - STANDARD_UNITS
```
public static final String[] STANDARD_UNITS
```
    The array of the names of the standard units.
- Constructor Detail
  - Unit
```
protected Unit(String nameOrNameKey,
               String abbreviationOrAbbreviationKey,
               UnitSystem unitSystem,
               boolean standardUnit)
```
    Build a standard unit and create the fields for a unit. If the parameter standardUnit is true, it is a standard unit where name is the nameKey, and abbreviation is the abbreviationKey; if false, this unit is a user-defined unit where the localization files do not have an entry. If standardUnit is true, a UnitException is silently ignored; if standardUnit is false a UnitException is thrown as a RunTimeException.
    
    Parameters:
    
    nameOrNameKey - if standardUnit: the key to the locale file for the long name of the unit, otherwise the name itself
    
    abbreviationOrAbbreviationKey - if standardUnit: the key to the locale file for the abbreviation of the unit, otherwise the abbreviation itself
    
    unitSystem - the unit system, e.g. SI or Imperial
    
    standardUnit - indicates whether it is a standard unit with a definition in the locale, or a user-defined unit
  - Unit
```
protected Unit(String nameOrNameKey,
               String abbreviationOrAbbreviationKey,
               UnitSystem unitSystem,
               Scale scale,
               boolean standardUnit)
```
    Build a unit with a specific conversion scale to/from the standard unit. If the parameter standardUnit is true, it is a standard unit where name is the nameKey, and abbreviation is the abbreviationKey; if false, this unit is a user-defined unit where the localization files do not have an entry. If standardUnit is true, a UnitException is silently ignored; if standardUnit is false a UnitException is thrown as a RunTimeException.
    
    Parameters:
    
    nameOrNameKey - if standardUnit: the key to the locale file for the long name of the unit, otherwise the name itself
    
    abbreviationOrAbbreviationKey - if standardUnit: the key to the locale file for the abbreviation of the unit, otherwise the abbreviation itself
    
    unitSystem - the unit system, e.g. SI or Imperial
    
    scale - the conversion scale to use for this unit
    
    standardUnit - indicates whether it is a standard unit with a definition in the locale, or a user-defined unit
- Method Detail
  - isLocalizable
```
public final boolean isLocalizable()
```
    Report if this unit support localization.
    
    Returns:
    
    boolean; true if this unit supports localization; false if it does not
  - getUnits
```
public static <V extends Unit<V>> Set<V> getUnits(Class<V> unitClass)
```
    Return a set of defined units for a given unit type.
    
    Type Parameters:
    
    V - the unit type to use in this method.
    
    Parameters:
    
    unitClass - the class for which the units are requested, e.g. ForceUnit.class
    
    Returns:
    
    the set of defined units belonging to the provided class. The empty set will be returned in case the unit type does not have any units.
  - getAllUnitsOfThisType
```
public final Set<Unit<U>> getAllUnitsOfThisType()
```
    Return a copy of the set of all defined units for this unit type.
    
    Returns:
    
    the set of defined units belonging to this Unit class. The empty set will be returned in case the unit type does not have any units.
  - getName
```
public final String getName()
```
    Returns:
    
    name, e.g. meters per second
  - getNameKey
```
public final String getNameKey()
```
    This method returns the name key, or null in case the name is hard coded.
    
    Returns:
    
    name key, e.g. DurationUnit.MetersPerSecond, or null for a user-defined unit
  - getAbbreviation
```
public final String getAbbreviation()
```
    Returns:
    
    abbreviation, e.g., m/s
  - getAbbreviationKey
```
public final String getAbbreviationKey()
```
    This method returns the abbreviation key, or null in case the abbreviation is hard coded.
    
    Returns:
    
    abbreviation key, e.g. DurationUnit.m/s, or null for a user-defined unit
  - getScale
```
public Scale getScale()
```
    Returns:
    
    the scale to transform between this unit and the reference (e.g., SI) unit.
  - getUnitSystem
```
public final UnitSystem getUnitSystem()
```
    Returns:
    
    unitSystem, e.g. SI or Imperial
  - getStandardUnit
```
public abstract U getStandardUnit()
```
    Returns:
    
    the SI standard unit for this unit, or the de facto standard unit if SI is not available
  - getSICoefficientsString
```
public abstract String getSICoefficientsString()
```
    Returns:
    
    the SI standard coefficients for this unit, e.g., kgm/s2 or m-2s2A or m^-2.s^2.A or m^-2s^2A (not necessarily normalized)
  - getSICoefficients
```
public final SICoefficients getSICoefficients()
```
    Returns:
    
    the SI coefficients
  - isBaseSIUnit
```
public final boolean isBaseSIUnit()
```
    Determine whether this unit is the standard unit.
    
    Returns:
    
    boolean; whether this is the standard unit or not
  - lookupUnitWithSICoefficients
```
public static Set<Unit<?>> lookupUnitWithSICoefficients(String normalizedSICoefficientsString)
```
    Parameters:
    
    normalizedSICoefficientsString - the normalized string (e.g., kg.m/s2) to look up
    
    Returns:
    
    a set with the Units belonging to this string, or an empty set when it does not exist
  - lookupOrCreateUnitWithSICoefficients
```
public static Set<Unit<?>> lookupOrCreateUnitWithSICoefficients(String normalizedSICoefficientsString)
```
    Parameters:
    
    normalizedSICoefficientsString - the normalized string (e.g., kg.m/s2) to look up
    
    Returns:
    
    a set of Units belonging to this string, or a set with a new unit when it does not yet exist
  - lookupOrCreateSIUnitWithSICoefficients
```
public static SIUnit lookupOrCreateSIUnitWithSICoefficients(String normalizedSICoefficientsString)
```
    Parameters:
    
    normalizedSICoefficientsString - the normalized string (e.g., kg.m/s2) to look up
    
    Returns:
    
    the Unit belonging to this string, or a new unit when it does not yet exist
  - toString
```
public final String toString()
```
    Overrides:
    
    toString in class Object
  - generateHashCode
```
public final int generateHashCode()
```
    Generate a hashCode for caching.
    
    Returns:
    
    a hashCode that is consistent with the equals() method.
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - equals
```
public boolean equals(Object obj)
```
    Overrides:
    
    equals in class Object
  - equalsIgnoreNaming
```
public abstract boolean equalsIgnoreNaming(Object obj)
```
    Test if two units are the same, except for the name and abbreviation. This means for instance that for the MassUnits METRIC_TON and MEGAGRAM (both 1000 kg) equals(...) will yield false, but equalsIgnoreNaming will yield true.
    
    Parameters:
    
    obj - the object to compare with
    
    Returns:
    
    true if the two units are the same numerically, except for the naming and/or abbreviation

Class Unit<U extends Unit<U>>

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

STANDARD_UNITS

Constructor Detail

Unit

Unit

Method Detail

isLocalizable

getUnits

getAllUnitsOfThisType

getName

getNameKey

getAbbreviation

getAbbreviationKey

getScale

getUnitSystem

getStandardUnit

getSICoefficientsString

getSICoefficients

isBaseSIUnit

lookupUnitWithSICoefficients

lookupOrCreateUnitWithSICoefficients

lookupOrCreateSIUnitWithSICoefficients

toString

generateHashCode

hashCode

equals

equalsIgnoreNaming