Package org.wildfly.clustering.cache.function

Class Functions

java.lang.Object

org.wildfly.clustering.cache.function.Functions

public class Functions
extends Object

Reusable function implementations.

Author:

Paul Ferraro

Method Summary

Modifier and Type	Method	Description
static <R> DoubleFunction<R>	constantDoubleFunction(R result)	Returns a function that always returns a constant result, regardless of input.
static <T, R> Function<T,R>	constantFunction(R result)	Returns a function that always returns a constant result, regardless of input.
static <R> IntFunction<R>	constantIntFunction(R result)	Returns a function that always returns a constant result, regardless of input.
static <R> LongFunction<R>	constantLongFunction(R result)	Returns a function that always returns a constant result, regardless of input.
static <R> UnaryOperator<R>	constantOperator(R result)	Returns an operator that always returns a constant result, regardless of input.
static <T, R> Function<T,R>	nullFunction()	Returns a function that always returns null, regardless of input.
static <R> UnaryOperator<R>	nullOperator()	Returns an operator that always returns null, regardless of input.
static <T, R, E extends Exception> Function<T,R>	quiet(org.wildfly.common.function.ExceptionFunction<T,R,E> function, BiFunction<T,Exception,RuntimeException> exceptionWrapper)	Converts an ExceptionFunction to a Function, applying the specified exception wrapper on failure.
static <T> UnaryOperator<T>	whenNullFunction(Supplier<T> factory)	Returns a function that replaces a null with the value provided by the specified factory.
static <T> UnaryOperator<T>	whenNullFunction(T replacement)	Returns a function that replaces a null with the specified value.

Methods inherited from class java.lang.Object

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

Method Details

whenNullFunction

public static <T> UnaryOperator<T> whenNullFunction(T replacement)

Returns a function that replaces a null with the specified value.

Type Parameters:

T - the function type

Parameters:

replacement - the value

Returns:

a function that replaces a null with the specified value.

whenNullFunction

public static <T> UnaryOperator<T> whenNullFunction(Supplier<T> factory)

Returns a function that replaces a null with the value provided by the specified factory.

Type Parameters:

T - the function type

Parameters:

factory - the provider of the replacement value

Returns:

a function that replaces a null with the value provided by the specified factory.

nullOperator

public static <R> UnaryOperator<R> nullOperator()

Returns an operator that always returns null, regardless of input.

Type Parameters:

R - the operator type

Returns:

an operator that always returns null.

constantOperator

public static <R> UnaryOperator<R> constantOperator(R result)

Returns an operator that always returns a constant result, regardless of input.

Type Parameters:

R - the operator type

Parameters:

result - the value returned by the constant operator

Returns:

an operator that always returns the specified result

nullFunction

public static <T,
R> Function<T,R> nullFunction()

Returns a function that always returns null, regardless of input.

Type Parameters:

T - the function parameter type

R - the function return type

Returns:

a function that always returns null.

constantFunction

public static <T,
R> Function<T,R> constantFunction(R result)

Returns a function that always returns a constant result, regardless of input.

Type Parameters:

T - the function parameter type

R - the function return type

Parameters:

result - the value to return by the constant function

Returns:

a function that always returns the specified result

constantIntFunction

public static <R> IntFunction<R> constantIntFunction(R result)

Returns a function that always returns a constant result, regardless of input.

Type Parameters:

R - the function return type

Parameters:

result - the value to return by the constant function

Returns:

a function that always returns the specified result

constantLongFunction

public static <R> LongFunction<R> constantLongFunction(R result)

Returns a function that always returns a constant result, regardless of input.

Type Parameters:

R - the function return type

Parameters:

result - the value to return by the constant function

Returns:

a function that always returns the specified result

constantDoubleFunction

public static <R> DoubleFunction<R> constantDoubleFunction(R result)

Returns a function that always returns a constant result, regardless of input.

Type Parameters:

R - the function return type

Parameters:

result - the value to return by the constant function

Returns:

a function that always returns the specified result

quiet

public static <T,
R,
E extends Exception>
Function<T,R> quiet(org.wildfly.common.function.ExceptionFunction<T,R,E> function,
 BiFunction<T,Exception,RuntimeException> exceptionWrapper)

Converts an ExceptionFunction to a Function, applying the specified exception wrapper on failure.

Type Parameters:

T - the function parameter type

R - the function return type

E - the function exception type

Parameters:

function - the exception function to quiet

exceptionWrapper - an exception wrapper

Returns:

a function.