org.mule.runtime.api.util

Class FunctionalUtils

java.lang.Object

org.mule.runtime.api.util.FunctionalUtils

public class FunctionalUtils
extends Object

Utilities for functional programming

Since:

1.2

Constructor Summary

Constructors

Constructor and Description
FunctionalUtils()

Method Summary

Modifier and Type	Method and Description
static <K,V> V	computeIfAbsent(Map<K,V> map, K key, Function<K,V> mappingFunction) Use this method instead if Map.computeIfAbsent(Object, Function) when the mapping functions are recursive and/or will end up accessing the same map again.
static <T> void	ifPresent(Optional<T> optional, Consumer<? super T> ifPresent, Runnable orElse) If the optional is present, it executes the ifPresent consumer.
static <T> Optional<T>	or(Optional<T> optional, Supplier<Optional<T>> orElse) If the given optional is not present, then it returns the optional provided by the orElse supplier

Methods inherited from class java.lang.Object

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

Constructor Detail

FunctionalUtils

public FunctionalUtils()

Method Detail

computeIfAbsent

public static <K,V> V computeIfAbsent(Map<K,V> map,
                                      K key,
                                      Function<K,V> mappingFunction)

Use this method instead if Map.computeIfAbsent(Object, Function) when the mapping functions are recursive and/or will end up accessing the same map again. This is necessary because starting with JDK9 Map.computeIfAbsent(Object, Function) throws ConcurrentModificationException if used in concurrent, recursive, or nested fashion.

or

public static <T> Optional<T> or(Optional<T> optional,
                                 Supplier<Optional<T>> orElse)

If the given optional is not present, then it returns the optional provided by the orElse supplier

Type Parameters:

T - the generic type of the optional item

Parameters:

optional - an Optional

orElse - a Supplier that provides the return value in case the optional is empty

Returns:

an Optional

ifPresent

public static <T> void ifPresent(Optional<T> optional,
                                 Consumer<? super T> ifPresent,
                                 Runnable orElse)

If the optional is present, it executes the ifPresent consumer. Otherwise, it executes the orElse runnable

Type Parameters:

T - the generic type of the optional's value.

Parameters:

optional - an Optional value

ifPresent - the consumer to execute if the value is present

orElse - a fallback runnable in case the optional is empty.