Package org.opencastproject.util.data

Class Function<A,B>

java.lang.Object

org.opencastproject.util.data.Function<A,B>

Direct Known Subclasses:

Effect, Function.X, Predicate

public abstract class Function<A,B>
extends Object

Function of arity 1. A general note on function implementations: Each function has an associated X version with the only difference that a checked exception may be thrown on application. This behaviour could be nicely combined into the main function class but with the cost of having no abstract method. Some IDEs such as IntelliJ support nice code folding for SAM (single abstract method) classes.

See Also:

• Function.X

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Function.X<A,B>	Version of Function that allows for throwing a checked exception.

Constructor Summary

Constructors

Constructor	Description
Function()

Method Summary

Modifier and Type	Method	Description
abstract B	apply(A a)	Apply function to a.
Function<A,Function0<B>>	curry()	Currying.
Function0<B>	curry(A a)	Currying.
<X> Function<A,Either<X,B>>	either(Function<Exception,X> handler)
Function<A,B>	handle(Function<? super Exception,B> handler)
<C> Function<C,B>	o(Function<? super C,? extends A> f)	Function composition.
Function0<B>	o(Function0<? extends A> f)	Function composition.
Function<A,B>	rethrow(Function<? super Exception,? extends Exception> transformer)
<C> Function<A,C>	then(Function<? super B,? extends C> f)	Left to right composition: f then g = g(f(x))
Effect<A>	toEffect()	Turn this function into an effect by discarding its result.
com.entwinemedia.fn.Fn<A,B>	toFn()

Methods inherited from class java.lang.Object

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

Constructor Details

Function

public Function()

Method Details

apply

public abstract B apply(A a)

Apply function to a.

curry

public Function0<B> curry(A a)

Currying.

curry

public Function<A,Function0<B>> curry()

Currying.

o

public <C> Function<C,B> o(Function<? super C,? extends A> f)

Function composition. g.o(f).apply(x) == g(f(x))

o

public Function0<B> o(Function0<? extends A> f)

Function composition. g.o(f).apply() == g(f())

then

public <C> Function<A,C> then(Function<? super B,? extends C> f)

Left to right composition: f then g = g(f(x))

rethrow

public Function<A,B> rethrow(Function<? super Exception,? extends Exception> transformer)

See Also:

• Functions.rethrow(Function, Function)

handle

public Function<A,B> handle(Function<? super Exception,B> handler)

See Also:

• Functions.handle(Function, Function)

either

public <X> Function<A,Either<X,B>> either(Function<Exception,X> handler)

See Also:

• Functions.either(Function, Function)

toEffect

public Effect<A> toEffect()

Turn this function into an effect by discarding its result.

toFn

public com.entwinemedia.fn.Fn<A,B> toFn()