org.apache.commons.lang3.function

Class Functions

java.lang.Object

org.apache.commons.lang3.function.Functions

public final class Functions
extends java.lang.Object

Factory for Function.

Since:

3.14.0

Method Summary

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

Methods inherited from class java.lang.Object

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

Method Detail

apply

public static <T,R> R apply(java.util.function.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> java.util.function.Function<T,R> function(java.util.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