Package software.amazon.smithy.utils

Class OptionalUtils

java.lang.Object

software.amazon.smithy.utils.OptionalUtils

public final class OptionalUtils
extends Object

Functions that make working with optionals easier.

Method Summary

Modifier and Type	Method	Description
static <T> void	ifPresentOrElse(Optional<T> value, Consumer<T> action, Runnable emptyAction)	Invokes a consumer if the Optional has a value, otherwise invoked a Runnable when the Optional is empty.
static <T> Optional<T>	or(Optional<T> value, Supplier<Optional<? extends T>> supplier)	Retrieves the value of the optional if present or invokes the supplier for a value.
static <T> Stream<T>	stream(Optional<T> value)	Converts an Optional into a Stream that can be used in a flatmap.

Methods inherited from class java.lang.Object

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

Method Details

or

public static <T> Optional<T> or(Optional<T> value,
 Supplier<Optional<? extends T>> supplier)

Retrieves the value of the optional if present or invokes the supplier for a value.

Type Parameters:

T - Type of value.

Parameters:

value - Value to check.

supplier - Supplier for a value if no value is present.

Returns:

A value of type T.

stream

public static <T> Stream<T> stream(Optional<T> value)

Converts an Optional into a Stream that can be used in a flatmap.

This is a polyfill of Java 9's Optional#stream.

Type Parameters:

T - Value type.

Parameters:

value - Value to convert to a stream.

Returns:

A stream that contains a present value or a stream that is empty.

ifPresentOrElse

public static <T> void ifPresentOrElse(Optional<T> value,
 Consumer<T> action,
 Runnable emptyAction)

Invokes a consumer if the Optional has a value, otherwise invoked a Runnable when the Optional is empty.

Type Parameters:

T - Type of value.

Parameters:

value - Value to check.

action - Action to invoke if a value is present.

emptyAction - Runnable to invoke if a value is not present.