Package org.apache.commons.chain.web
Interface CheckedFunction<T,R,E extends Throwable>
- Type Parameters:
T
- the type of the input to the functionR
- the type of the result of the functionE
- the type of the exception to the operation
- Functional Interface:
- This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
Represents a function that accepts one argument and produces a result.
With this functional interface it is possible that an exception is thrown.
This is a functional interface
whose functional method is apply(Object)
.
- Since:
- Chain 1.8
-
Method Summary
Modifier and TypeMethodDescriptiondefault <V> CheckedFunction
<T, V, E> andThen
(CheckedFunction<? super R, ? extends V, E> after) Returns a composedCheckedFunction
that first applies this function to its input, and then applies theafter
function to the result.Applies this function to the given argument.default <V> CheckedFunction
<V, R, E> compose
(CheckedFunction<? super V, ? extends T, E> before) Returns a composedCheckedFunction
that first applies thebefore
function to its input, and then applies this function to the result.static <T,
E extends Throwable>
CheckedFunction<T, T, E> identity()
Returns a function that always returns its input argument.
-
Method Details
-
apply
Applies this function to the given argument.- Parameters:
t
- the function argument- Returns:
- the function result
- Throws:
E
- the possible exception
-
compose
default <V> CheckedFunction<V,R, composeE> (CheckedFunction<? super V, ? extends T, throws EE> before) Returns a composedCheckedFunction
that first applies thebefore
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 thebefore
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 nullE
- the possible exception- See Also:
-
andThen
Returns a composedCheckedFunction
that first applies this function to its input, and then applies theafter
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 theafter
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 nullE
- the possible exception- See Also:
-
identity
Returns a function that always returns its input argument.- Type Parameters:
T
- the type of the input and output objects to the functionE
- the type of the exception of the input and output objects to the function- Returns:
- a function that always returns its input argument
- Throws:
E
- the possible exception
-