org.neo4j.function

Interface ThrowingFunction<T,R,E extends Exception>

Type Parameters:

T - the type of the input to the function

R - the type of the result of the function

E - the type of exception that may be thrown from the function

All Known Subinterfaces:

IOFunction<T,R>, ThrowingUnaryOperator<T,E>

public interface ThrowingFunction<T,R,E extends Exception>

Represents a function that accepts one argument and produces a result, or throws an exception.

Method Summary

Modifier and Type	Method and Description
R	apply(T t) Apply a value to this function
static <T,R,E extends Exception> Function<T,R>	catchThrown(Class<E> clazz, ThrowingFunction<T,R,E> throwing) Construct a regular function that calls a throwing function and catches all checked exceptions declared and thrown by the throwing function and rethrows them as UncaughtCheckedException for handling further up the stack.
static <E extends Exception> void	throwIfPresent(Optional<E> exception)

Method Detail

apply

R apply(T t)
 throws E extends Exception

Apply a value to this function

Parameters:

t - the function argument

Returns:

the function result

Throws:

E - an exception if the function fails

E extends Exception

catchThrown

static <T,R,E extends Exception> Function<T,R> catchThrown(Class<E> clazz,
                                                           ThrowingFunction<T,R,E> throwing)

Construct a regular function that calls a throwing function and catches all checked exceptions declared and thrown by the throwing function and rethrows them as UncaughtCheckedException for handling further up the stack.

Type Parameters:

T - type of arguments

R - type of results

E - type of checked exceptions thrown by the throwing function

Parameters:

throwing - the throwing function to wtap

Returns:

a new, non-throwing function

Throws:

IllegalStateException - if an unexpected exception is caught (ie. neither of type E or a runtime exception)

See Also:

UncaughtCheckedException

throwIfPresent

static <E extends Exception> void throwIfPresent(Optional<E> exception)
                                          throws E extends Exception

Throws:

E extends Exception