net.time4j.engine

Class BasicUnit

java.lang.Object

net.time4j.engine.BasicUnit

All Implemented Interfaces:

ChronoUnit

public abstract class BasicUnit
extends Object
implements ChronoUnit

Abstract time unit class which can define its own rule.

See Also:

TimePoint.plus(long, U), TimePoint.minus(long, U), TimePoint.until(T, U)

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	BasicUnit() Subclasses usually define a singleton and have no public constructors.

Method Summary

Methods

Modifier and Type	Method and Description
protected <T extends ChronoEntity<T>> UnitRule<T>	derive(Chronology<T> chronology) Derives an optional unit rule for given chronology.
boolean	isCalendrical() Queries if this time unit is calendrical respective is at least as long as a calendar day.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface net.time4j.engine.ChronoUnit

getLength

Constructor Detail

BasicUnit

protected BasicUnit()

Subclasses usually define a singleton and have no public constructors.

Method Detail

isCalendrical

public boolean isCalendrical()

Description copied from interface: ChronoUnit

Queries if this time unit is calendrical respective is at least as long as a calendar day.

Implementation note: The method must be consistent with the typical length of the unit. The expression Double.compare(unit.getLength(), 86400.0) >= 0 is equivalent to unit.isCalendrical().

Specified by:

isCalendrical in interface ChronoUnit

Returns:

true if at least as long as a day else false

derive

protected <T extends ChronoEntity<T>> UnitRule<T> derive(Chronology<T> chronology)

Derives an optional unit rule for given chronology.

This implementation yields null so that a chronology must register this unit. Specialized subclasses can define a rule however if the chronology has not registered this unit.

Type Parameters:

T - generic type of time context

Parameters:

chronology - chronology an unit rule is searched for

Returns:

unit rule or null if given chronology is not supported