org.osgl

Class Lang.F0<R>

java.lang.Object

org.osgl.Lang.FuncBase

org.osgl.Lang.F0<R>

All Implemented Interfaces:

Lang.Func0<R>

Direct Known Subclasses:

ContextLocal.InitialValueProvider, Lang.Factory, Lang.Provider

Enclosing class:

Lang

public abstract static class Lang.F0<R>
extends Lang.FuncBase
implements Lang.Func0<R>

Default implementation for Lang.Func0. Implementation of Lang.Func0 should (nearly) always extend to this class instead of implement the interface directly

Since:

0.2

Constructor Summary

Constructors

Constructor and Description
F0()

Method Summary

Modifier and Type	Method and Description
Lang.F0<R>	andThen(Lang.Func0<? extends R>... fs) Returns a composed function that applied, in sequence, this function and all functions specified one by one.
<T> Lang.Producer<T>	andThen(Lang.Function<? super R,? extends T> after) Returns a composed function that applies this function to it’s input and then applies the after function to the result.
R	applyOrElse(Lang.F0<? extends R> fallback) Applies this partial function to the given argument when it is contained in the function domain.
Lang.F0<Lang.Option<R>>	lift() Turns this partial function into a plain function returning an Option result.
Lang.F0<R>	orElse(Lang.Func0<? extends R> fallback) Returns a composed function that when applied, try to apply this function first, in case a RuntimeException is captured apply to the fallback function specified.

Methods inherited from class org.osgl.Lang.FuncBase

breakOut

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.osgl.Lang.Func0

apply

Constructor Detail

F0

public F0()

Method Detail

applyOrElse

public R applyOrElse(Lang.F0<? extends R> fallback)

Applies this partial function to the given argument when it is contained in the function domain. Applies fallback function where this partial function is not defined, i.e. any RuntimeException is captured

Parameters:

fallback - if RuntimeException captured then apply this fallback function

Returns:

the result of this function or the fallback function application

andThen

public <T> Lang.Producer<T> andThen(Lang.Function<? super R,? extends T> after)

Returns a composed function that applies this function to it’s input and then applies the after function to the result. If evaluation of either function throws an exception, it is relayed to the caller of the composed function.

Type Parameters:

T - the type of the output of the before function

Parameters:

after - the function applies after this function is applied

Returns:

the composed function

Throws:

NullPointerException - if before is null

andThen

public Lang.F0<R> andThen(Lang.Func0<? extends R>... fs)

Returns a composed function that applied, in sequence, this function and all functions specified one by one. If applying anyone of the functions throws an exception, it is relayed to the caller of the composed function. If an exception is thrown out, the following functions will not be applied.

When apply the composed function, the result of the last function is returned

Parameters:

fs - a sequence of function to be applied after this function

Returns:

a composed function

orElse

public Lang.F0<R> orElse(Lang.Func0<? extends R> fallback)

Returns a composed function that when applied, try to apply this function first, in case a RuntimeException is captured apply to the fallback function specified. This method helps to implement partial function

Parameters:

fallback - the function to applied if this function doesn’t apply in the current situation

Returns:

the final result

lift

public Lang.F0<Lang.Option<R>> lift()

Turns this partial function into a plain function returning an Option result.

Returns:

a function that takes an argument x to Some(this.apply(x)) if this can be applied, and to None otherwise.