Package org.apache.commons.lang3.function

Class Functions

java.lang.Object

org.apache.commons.lang3.function.Functions

public final class Functions
extends Object

Factory for Function.

Since:

3.14.0

Method Summary

Modifier and Type	Method	Description
static <T, R> R	apply(Function<T,R> function, T object)	Applies the Function on the object if the function is not null.
static <T, R> Function<T,R>	function(Function<T,R> function)	Starts a fluent chain like function(foo::bar).andThen(...).andThen(...).apply(...);

Methods inherited from class java.lang.Object

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

Method Details

apply

public static <T,
R> R apply(Function<T,R> function,
 T object)

Applies the Function on the object if the function is not null. Otherwise, does nothing and returns null.

Type Parameters:

T - the type of the argument the function applies.

R - the type of the result the function returns.

Parameters:

function - the function to apply.

object - the object to apply the function.

Returns:

the value the function returns if the function is not null; null otherwise.

Since:

3.15.0

function

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

Starts a fluent chain like function(foo::bar).andThen(...).andThen(...).apply(...);

Type Parameters:

T - Input type.

R - Return type.

Parameters:

function - the argument to return.

Returns:

the argument