com.helger.commons.functional

Interface IThrowingFunction<T,R,EXTYPE extends Throwable>

Type Parameters:

T - the type of the input to the function

R - the type of the result of the function

EXTYPE - exception type

All Superinterfaces:

Serializable

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface IThrowingFunction<T,R,EXTYPE extends Throwable>
extends Serializable

Represents a function that accepts one argument and produces a result and may throw an Exception.

This is a functional interface whose functional method is apply(Object).

Since:

8.3.1

Method Summary

Modifier and Type	Method and Description
default <V> IThrowingFunction<T,V,EXTYPE>	andThen(IThrowingFunction<? super R,? extends V,? extends EXTYPE> after) Returns a composed function that first applies this function to its input, and then applies the after function to the result.
R	apply(T t) Applies this function to the given argument.
default <V> IThrowingFunction<V,R,EXTYPE>	compose(IThrowingFunction<? super V,? extends T,? extends EXTYPE> before) Returns a composed function that first applies the before function to its input, and then applies this function to the result.

Method Detail

apply

R apply(T t)
 throws EXTYPE extends Throwable

Applies this function to the given argument.

Parameters:

t - the function argument

Returns:

the function result

Throws:

EXTYPE - In case it is needed

EXTYPE extends Throwable

compose

@Nonnull
default <V> IThrowingFunction<V,R,EXTYPE> compose(@Nonnull
                                                            IThrowingFunction<? super V,? extends T,? extends EXTYPE> before)

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

Type Parameters:

V - the type of input to the before function, and to the composed function

Parameters:

before - the function to apply before this function is applied

Returns:

a composed function that first applies the before function and then applies this function

Throws:

NullPointerException - if before is null

See Also:

andThen(IThrowingFunction)

andThen

@Nonnull
default <V> IThrowingFunction<T,V,EXTYPE> andThen(@Nonnull
                                                            IThrowingFunction<? super R,? extends V,? extends EXTYPE> after)

Returns a composed function that first applies this function to its 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:

V - the type of output of the after function, and of the composed function

Parameters:

after - the function to apply after this function is applied

Returns:

a composed function that first applies this function and then applies the after function

Throws:

NullPointerException - if after is null

See Also:

compose(IThrowingFunction)