de.kaleidox.util

Class PromisedValue<P,T>

java.lang.Object

de.kaleidox.util.PromisedValue<P,T>

Type Parameters:

P - Type-variable for the promised value.

T - Type-variable for the possibly existing value.

public final class PromisedValue<P,T>
extends Object

Wrapper class for a value that might not be available yet but might be available later.

A value of type P is always available (thus; promised).

Used by Emoji.getCategory().

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	PromisedValue.NullableFunction<P,T> Supertype of Function with a Nullable annotation for IntelliJ code inspection.

Constructor Summary

Constructors

Constructor and Description
PromisedValue(P promisedValue, PromisedValue.NullableFunction<P,T> mapper) Constructor.

Method Summary

Modifier and Type	Method and Description
Optional<T>	getPossibleValue() Tries to fetch the possible value using the provided mapper.
P	getPromisedValue() Returns the promised value.

Methods inherited from class java.lang.Object

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

Constructor Detail

PromisedValue

public PromisedValue(P promisedValue,
                     PromisedValue.NullableFunction<P,T> mapper)

Constructor.

Parameters:

promisedValue - The promised value. This will be used to fetch the possible value later.

mapper - A function to determine the possible value based on the defined promised value.

Method Detail

getPromisedValue

public P getPromisedValue()

Returns the promised value.

Returns:

The promised value.

getPossibleValue

public Optional<T> getPossibleValue()

Tries to fetch the possible value using the provided mapper.

If the mapper also returns null, the returned Optional is empty. Although, it might succeed on the next try. Once the Optional returns non-empty, the possible value remains the same.

Returns:

The possible value.