Package org.apache.commons.io.function
Interface IOFunction<T,R>

 Type Parameters:
T
 the type of the input to the operations.R
 the return type of the operations.
 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 IOFunction<T,R>
LikeFunction
but throwsIOException
. Since:
 2.7


Method Summary
All Methods Static Methods Instance Methods Abstract Methods Default Methods Modifier and Type Method Description default IOConsumer<T>
andThen(java.util.function.Consumer<? super R> after)
Returns a composedIOFunction
that first applies this function to its input, and then applies theafter
consumer to the result.default <V> IOFunction<T,V>
andThen(java.util.function.Function<? super R,? extends V> after)
Returns a composedIOFunction
that first applies this function to its input, and then applies theafter
function to the result.default IOConsumer<T>
andThen(IOConsumer<? super R> after)
Returns a composedIOFunction
that first applies this function to its input, and then applies theafter
consumer to the result.default <V> IOFunction<T,V>
andThen(IOFunction<? super R,? extends V> after)
Returns a composedIOFunction
that first applies this function to its input, and then applies theafter
function to the result.R
apply(T t)
Applies this function to the given argument.default <V> IOFunction<V,R>
compose(java.util.function.Function<? super V,? extends T> before)
Returns a composedIOFunction
that first applies thebefore
function to its input, and then applies this function to the result.default IOSupplier<R>
compose(java.util.function.Supplier<? extends T> before)
Returns a composedIOFunction
that first applies thebefore
function to its input, and then applies this function to the result.default <V> IOFunction<V,R>
compose(IOFunction<? super V,? extends T> before)
Returns a composedIOFunction
that first applies thebefore
function to its input, and then applies this function to the result.default IOSupplier<R>
compose(IOSupplier<? extends T> before)
Returns a composedIOFunction
that first applies thebefore
function to its input, and then applies this function to the result.static <T> IOFunction<T,T>
identity()
Returns aIOFunction
that always returns its input argument.



Method Detail

apply
R apply(T t) throws java.io.IOException
Applies this function to the given argument. Parameters:
t
 the function argument Returns:
 the function result
 Throws:
java.io.IOException
 if the function throws an IOException

compose
default <V> IOFunction<V,R> compose(IOFunction<? super V,? extends T> before)
Returns a composedIOFunction
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:
java.lang.NullPointerException
 if before is null See Also:
andThen(IOFunction)

compose
default <V> IOFunction<V,R> compose(java.util.function.Function<? super V,? extends T> before)
Returns a composedIOFunction
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:
java.lang.NullPointerException
 if before is null See Also:
andThen(IOFunction)

compose
default IOSupplier<R> compose(IOSupplier<? extends T> before)
Returns a composedIOFunction
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. Parameters:
before
 the supplier which feeds the application of this function Returns:
 a composed function that first applies the
before
function and then applies this function  Throws:
java.lang.NullPointerException
 if before is null See Also:
andThen(IOFunction)

compose
default IOSupplier<R> compose(java.util.function.Supplier<? extends T> before)
Returns a composedIOFunction
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. Parameters:
before
 the supplier which feeds the application of this function Returns:
 a composed function that first applies the
before
function and then applies this function  Throws:
java.lang.NullPointerException
 if before is null See Also:
andThen(IOFunction)

andThen
default <V> IOFunction<T,V> andThen(IOFunction<? super R,? extends V> after)
Returns a composedIOFunction
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:
java.lang.NullPointerException
 if after is null See Also:
compose(IOFunction)

andThen
default <V> IOFunction<T,V> andThen(java.util.function.Function<? super R,? extends V> after)
Returns a composedIOFunction
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:
java.lang.NullPointerException
 if after is null See Also:
compose(IOFunction)

andThen
default IOConsumer<T> andThen(IOConsumer<? super R> after)
Returns a composedIOFunction
that first applies this function to its input, and then applies theafter
consumer to the result. If evaluation of either function throws an exception, it is relayed to the caller of the composed function. Parameters:
after
 the consumer to apply after this function is applied Returns:
 a composed function that first applies this function and then
applies the
after
consumer  Throws:
java.lang.NullPointerException
 if after is null See Also:
compose(IOFunction)

andThen
default IOConsumer<T> andThen(java.util.function.Consumer<? super R> after)
Returns a composedIOFunction
that first applies this function to its input, and then applies theafter
consumer to the result. If evaluation of either function throws an exception, it is relayed to the caller of the composed function. Parameters:
after
 the consumer to apply after this function is applied Returns:
 a composed function that first applies this function and then
applies the
after
consumer  Throws:
java.lang.NullPointerException
 if after is null See Also:
compose(IOFunction)

identity
static <T> IOFunction<T,T> identity()
Returns aIOFunction
that always returns its input argument. Type Parameters:
T
 the type of the input and output objects to the function Returns:
 a function that always returns its input argument

