All Superinterfaces:

java.io.Serializable

All Known Implementing Classes:

ConcreteDuration, Days, Hours, JulianYears, Mins, NanoSecs, Revs, Secs
```
public interface Duration
extends java.io.Serializable
```
A Duration represents an amount of time on a proper time scale. There are two implementations provided of the conversions methods one as object interface, where an object of the current class has to be instantiated. The oder implementation is provided as static class methods. Performance tests of both implementations have come up with a performance improvement of 20% of the static methods compared with the object methods.

Field Summary

Fields
Modifier and Type	Field	Description
`static double`	`DAYS_PER_JULIAN_YEAR`
`static double`	`HOURS_PER_DAY`
`static double`	`HOURS_PER_JULIAN_YEAR`
`static double`	`HOURS_PER_REV`
`static double`	`MINS_PER_DAY`
`static double`	`MINS_PER_HOUR`
`static double`	`MINS_PER_JULIAN_YEAR`
`static double`	`MINS_PER_REV`
`static double`	`NS_PER_DAY`
`static long`	`NS_PER_DAY_L`
`static double`	`NS_PER_HOUR`
`static long`	`NS_PER_HOUR_L`
`static double`	`NS_PER_JULIAN_YEAR`
`static long`	`NS_PER_JULIAN_YEAR_L`
`static double`	`NS_PER_MIN`
`static long`	`NS_PER_MIN_L`
`static double`	`NS_PER_REV`
`static long`	`NS_PER_REV_L`
`static long`	`NS_PER_SEC`	A few obvious constants
`static double`	`REVS_PER_DAY`
`static double`	`REVS_PER_JULIAN_YEAR`
`static double`	`SECS_PER_DAY`
`static double`	`SECS_PER_HOUR`
`static double`	`SECS_PER_JULIAN_YEAR`
`static double`	`SECS_PER_MIN`
`static double`	`SECS_PER_REV`

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Duration`	`add(Duration d)`	Add a duration to this one
`double`	`asDays()`
`double`	`asHours()`
`double`	`asJulianYears()`
`double`	`asMins()`
`long`	`asNanoSecs()`
`double`	`asRevs()`
`double`	`asSecs()`
`TimeScale`	`getScale()`
`boolean`	`isLongerThan(Duration d)`	Check that this duration is longer than a given one
`Duration`	`mult(double s)`	Multiply this duration by a given factor
`Duration`	`negate()`
`Duration`	`set(Duration d)`	Set this duration to a new given one
`void`	`setScale(TimeScale scale)`	Set the time scale for this duration
`Duration`	`sub(Duration d)`	Subtract a duration from this one

- Field Detail
  - NS_PER_SEC
```
static final long NS_PER_SEC
```
    A few obvious constants
    
    See Also:
    
    Constant Field Values
  - SECS_PER_MIN
```
static final double SECS_PER_MIN
```
    See Also:
    
    Constant Field Values
  - MINS_PER_HOUR
```
static final double MINS_PER_HOUR
```
    See Also:
    
    Constant Field Values
  - HOURS_PER_DAY
```
static final double HOURS_PER_DAY
```
    See Also:
    
    Constant Field Values
  - DAYS_PER_JULIAN_YEAR
```
static final double DAYS_PER_JULIAN_YEAR
```
    See Also:
    
    Constant Field Values
  - HOURS_PER_REV
```
static final double HOURS_PER_REV
```
    See Also:
    
    Constant Field Values
  - REVS_PER_DAY
```
static final double REVS_PER_DAY
```
    See Also:
    
    Constant Field Values
  - REVS_PER_JULIAN_YEAR
```
static final double REVS_PER_JULIAN_YEAR
```
    See Also:
    
    Constant Field Values
  - HOURS_PER_JULIAN_YEAR
```
static final double HOURS_PER_JULIAN_YEAR
```
    See Also:
    
    Constant Field Values
  - MINS_PER_JULIAN_YEAR
```
static final double MINS_PER_JULIAN_YEAR
```
    See Also:
    
    Constant Field Values
  - SECS_PER_JULIAN_YEAR
```
static final double SECS_PER_JULIAN_YEAR
```
    See Also:
    
    Constant Field Values
  - NS_PER_JULIAN_YEAR
```
static final double NS_PER_JULIAN_YEAR
```
    See Also:
    
    Constant Field Values
  - NS_PER_JULIAN_YEAR_L
```
static final long NS_PER_JULIAN_YEAR_L
```
    See Also:
    
    Constant Field Values
  - MINS_PER_DAY
```
static final double MINS_PER_DAY
```
    See Also:
    
    Constant Field Values
  - SECS_PER_DAY
```
static final double SECS_PER_DAY
```
    See Also:
    
    Constant Field Values
  - NS_PER_DAY
```
static final double NS_PER_DAY
```
    See Also:
    
    Constant Field Values
  - NS_PER_DAY_L
```
static final long NS_PER_DAY_L
```
    See Also:
    
    Constant Field Values
  - MINS_PER_REV
```
static final double MINS_PER_REV
```
    See Also:
    
    Constant Field Values
  - SECS_PER_REV
```
static final double SECS_PER_REV
```
    See Also:
    
    Constant Field Values
  - NS_PER_REV
```
static final double NS_PER_REV
```
    See Also:
    
    Constant Field Values
  - NS_PER_REV_L
```
static final long NS_PER_REV_L
```
    See Also:
    
    Constant Field Values
  - SECS_PER_HOUR
```
static final double SECS_PER_HOUR
```
    See Also:
    
    Constant Field Values
  - NS_PER_HOUR
```
static final double NS_PER_HOUR
```
    See Also:
    
    Constant Field Values
  - NS_PER_HOUR_L
```
static final long NS_PER_HOUR_L
```
    See Also:
    
    Constant Field Values
  - NS_PER_MIN
```
static final double NS_PER_MIN
```
    See Also:
    
    Constant Field Values
  - NS_PER_MIN_L
```
static final long NS_PER_MIN_L
```
    See Also:
    
    Constant Field Values
- Method Detail
  - set
```
Duration set(Duration d)
```
    Set this duration to a new given one
    
    Parameters:
    
    d - duration to set this one to
    
    Returns:
    
    updated object
  - asNanoSecs
```
long asNanoSecs()
```
    Returns:
    
    duration expressed in ns
  - asSecs
```
double asSecs()
```
    Returns:
    
    duration expressed in s
  - asMins
```
double asMins()
```
    Returns:
    
    duration expressed in min
  - asHours
```
double asHours()
```
    Returns:
    
    duration expressed in h
  - asDays
```
double asDays()
```
    Returns:
    
    number of ns expressed days
  - asJulianYears
```
double asJulianYears()
```
    Returns:
    
    duration expressed in Julian years
  - asRevs
```
double asRevs()
```
    Returns:
    
    duration expressed in revolutions
  - negate
```
Duration negate()
```
    Returns:
    
    negated amount of time
  - add
```
Duration add(Duration d)
```
    Add a duration to this one
    
    Parameters:
    
    d - amount of time to add
    
    Returns:
    
    updated object
  - sub
```
Duration sub(Duration d)
```
    Subtract a duration from this one
    
    Parameters:
    
    d - amount of time to subtract
    
    Returns:
    
    updated object
  - isLongerThan
```
boolean isLongerThan(Duration d)
```
    Check that this duration is longer than a given one
    
    Parameters:
    
    d - duration to compare to
    
    Returns:
    
    true if this duration is longer than d
  - mult
```
Duration mult(double s)
```
    Multiply this duration by a given factor
    
    Parameters:
    
    s - scale factor
    
    Returns:
    
    updated object
  - getScale
```
TimeScale getScale()
```
    Returns:
    
    Current time scale of the duration
  - setScale
```
void setScale(TimeScale scale)
```
    Set the time scale for this duration
    
    Parameters:
    
    scale - time scale to set the duration to

Interface Duration

Field Summary

Method Summary

Field Detail

NS_PER_SEC

SECS_PER_MIN

MINS_PER_HOUR

HOURS_PER_DAY

DAYS_PER_JULIAN_YEAR

HOURS_PER_REV

REVS_PER_DAY

REVS_PER_JULIAN_YEAR

HOURS_PER_JULIAN_YEAR

MINS_PER_JULIAN_YEAR

SECS_PER_JULIAN_YEAR

NS_PER_JULIAN_YEAR

NS_PER_JULIAN_YEAR_L

MINS_PER_DAY

SECS_PER_DAY

NS_PER_DAY

NS_PER_DAY_L

MINS_PER_REV

SECS_PER_REV

NS_PER_REV

NS_PER_REV_L

SECS_PER_HOUR

NS_PER_HOUR

NS_PER_HOUR_L

NS_PER_MIN

NS_PER_MIN_L

Method Detail

set

asNanoSecs

asSecs

asMins

asHours

asDays

asJulianYears

asRevs

negate

add

sub

isLongerThan

mult

getScale

setScale