import {TemporalAmount} from '@js-joda/root/packages/core/src/temporal/TemporalAmount.js'

public interface | source

TemporalAmount

Direct Subclass:

Duration, Period

Framework-level interface defining an amount of time, such as "6 hours", "8 days" or "2 years and 3 months".

This is the base interface type for amounts of time. An amount is distinct from a date or time-of-day in that it is not tied to any specific point on the time-line.

The amount can be thought of as a Map of TemporalUnit to long, exposed via getUnits and get. A simple case might have a single unit-value pair, such as "6 hours". A more complex case may have multiple unit-value pairs, such as "7 years, 3 months and 5 days".

There are two common implementations. Period is a date-based implementation, storing years, months and days. Duration is a time-based implementation, storing seconds and nanoseconds, but providing some access using other duration based units such as minutes, hours and fixed 24-hour days.

This interface is a framework-level interface that should not be widely used in application code. Instead, applications should create and pass around instances of concrete types, such as Period and Duration.

Method Summary

Public Methods
public	addTo(temporal: Temporal): Temporal Adds to the specified temporal object.
public	get(unit: TemporalUnit): number Returns the value of the requested unit.
public	subtractFrom(temporal: Temporal): Temporal Subtracts this object from the specified temporal object.
public	units(): TemporalUnit[] Returns the list of units uniquely defining the value of this TemporalAmount.

Public Methods

public addTo(temporal: Temporal): Temporal source

Adds to the specified temporal object.

Adds the amount to the specified temporal object using the logic encapsulated in the implementing class.

There are two equivalent ways of using this method. The first is to invoke this method directly. The second is to use Temporal#plus:

  // These two lines are equivalent, but the second approach is recommended
  dateTime = amount.addTo(dateTime);
  dateTime = dateTime.plus(adder);

It is recommended to use the second approach, plus, as it is a lot clearer to read in code.

Params:

Name	Type	Attribute	Description
temporal	Temporal		the temporal object to add the amount to, not null

Return:

Temporal

an object of the same observable type with the addition made, not null

Throw:

*	DateTimeException if unable to add
*	ArithmeticException if numeric overflow occurs

public get(unit: TemporalUnit): number source

Returns the value of the requested unit. The units returned from getUnits uniquely define the value of the TemporalAmount. A value must be returned for each unit listed in getUnits.

Params:

Name	Type	Attribute	Description
unit	TemporalUnit		the TemporalUnit for which to return the value

Return:

number

the long value of the unit

Throw:

*	DateTimeException if a value for the unit cannot be obtained
*	UnsupportedTemporalTypeException if the unit is not supported

public subtractFrom(temporal: Temporal): Temporal source

Subtracts this object from the specified temporal object.

Subtracts the amount from the specified temporal object using the logic encapsulated in the implementing class.

There are two equivalent ways of using this method. The first is to invoke this method directly. The second is to use Temporal#minus:

  // these two lines are equivalent, but the second approach is recommended
  dateTime = amount.subtractFrom(dateTime);
  dateTime = dateTime.minus(amount);

It is recommended to use the second approach, minus, as it is a lot clearer to read in code.

Params:

Name	Type	Attribute	Description
temporal	Temporal		the temporal object to subtract the amount from, not null

Return:

Temporal

an object of the same observable type with the subtraction made, not null

Throw:

*	DateTimeException if unable to subtract
*	ArithmeticException if numeric overflow occurs

public units(): TemporalUnit[] source

Returns the list of units uniquely defining the value of this TemporalAmount. The list of TemporalUnits is defined by the implementation class. The list is a snapshot of the units at the time getUnits is called and is not mutable. The units are ordered from longest duration to the shortest duration of the unit.

Return:

TemporalUnit[]

the List of TemporalUnits; not null