org.osgl

Class Lang.Option.f

java.lang.Object

org.osgl.Lang.Option.f

Enclosing class:

Lang.Option<T>

public final class Lang.Option.f
extends Object

The runtime/instance function namespace

Field Summary

Fields

Modifier and Type	Field and Description
Lang.F0<T>	GET A function that when applied, returns the value described by this Option
Lang.F0<Boolean>	IS_DEFINED A function that when applied, returns if the Option is defined
Lang.F0<Boolean>	NOT_DEFINED Negate of IS_DEFINED

Method Summary

Modifier and Type	Method and Description
Lang.F0<Lang.Option<T>>	filter(Lang.Function<? super T,Boolean> predicate) Returns a function that when applied, run Option#filter(Function) on this Option
<B> Lang.F0<Lang.Option<B>>	flatMap(Lang.Function<? super T,Lang.Option<B>> mapper) Returns a function that when applied, run Option#flatMap(Function) on this Option
<B> Lang.F0<Lang.Option<B>>	map(Lang.Function<? super T,? extends B> mapper) Returns a function that when applied, run Option#map(Function) on this Option
Lang.F0<T>	orElse(Lang.Func0<? extends T> other) Returns a function that when applied, run Option#orElse(Func0) on this Option
Lang.F0<T>	orElse(T other) Returns a function that when applied, run Lang.Option.orElse(Object) on this Option
Lang.F0<Void>	runWith(Lang.Visitor<? super T> consumer) Returns a function that when applied, run Option#runWith(Visitor) on this Option

Methods inherited from class java.lang.Object

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

Field Detail

IS_DEFINED

public final Lang.F0<Boolean> IS_DEFINED

A function that when applied, returns if the Option is defined

NOT_DEFINED

public final Lang.F0<Boolean> NOT_DEFINED

Negate of IS_DEFINED

GET

public final Lang.F0<T> GET

A function that when applied, returns the value described by this Option

Method Detail

filter

public final Lang.F0<Lang.Option<T>> filter(Lang.Function<? super T,Boolean> predicate)

Returns a function that when applied, run Option#filter(Function) on this Option

Parameters:

predicate - the predicate function

Returns:

the function that returns either this option or Lang.NONE if predicate failed to test on the element in this option

map

public final <B> Lang.F0<Lang.Option<B>> map(Lang.Function<? super T,? extends B> mapper)

Returns a function that when applied, run Option#map(Function) on this Option

Type Parameters:

B - the type of returning option element type

Parameters:

mapper - the function that map T element to B object

Returns:

the function returns either a B type option if this option is defined or Lang.NONE if this option is not defined

flatMap

public final <B> Lang.F0<Lang.Option<B>> flatMap(Lang.Function<? super T,Lang.Option<B>> mapper)

Returns a function that when applied, run Option#flatMap(Function) on this Option

Type Parameters:

B - the element type of the Option

Parameters:

mapper - the function that map an elemnet of type T to a Option of type B

Returns:

the function that flat map all T element to B Options

orElse

public final Lang.F0<T> orElse(T other)

Returns a function that when applied, run Lang.Option.orElse(Object) on this Option

Parameters:

other - the other value to be returned if this option is empty

Returns:

the function implement else if semantic

orElse

public final Lang.F0<T> orElse(Lang.Func0<? extends T> other)

Returns a function that when applied, run Option#orElse(Func0) on this Option

Parameters:

other - the function that generates another T element when this option is empty

Returns:

the function that implement the else if semantic on this Option

runWith

public final Lang.F0<Void> runWith(Lang.Visitor<? super T> consumer)

Returns a function that when applied, run Option#runWith(Visitor) on this Option

Parameters:

consumer - the function that consumes the element in this Option

Returns:

a function that apply to consumer function if this Option is defined