Expected

open class Expected<E, V>

Expected is wrapper object around either a value or an error.

Parameters

<E>

The error type of expected

<V>

The value type of expected

Types

Action

@FunctionalInterface

interface Action<T>

Functional interface to run an action on expected types.

Transformer

@FunctionalInterface

interface Transformer<T, R>

Functional interface to transform expected types.

Functions

fold

@NonNull

open fun <R> fold(@NonNull errorFun: Expected.Transformer<E, R>, @NonNull valueFun: Expected.Transformer<V, R>): R

Fold the expected to a common type.

getValueOrElse

@NonNull

open fun getValueOrElse(@NonNull defaultFun: Expected.Transformer<E, V>): V

Retruns the value, if available, or produces a fallback with the provided function.

isError

open fun isError(): Boolean

Returns if the expected contains an error.

isValue

open fun isValue(): Boolean

Returns if the expected contains a value.

map

@NonNull

open fun <E1, V1> map(@NonNull errorFun: Expected.Transformer<E, E1>, @NonNull valueFun: Expected.Transformer<V, V1>): Expected<E1, V1>

Map both value or error to a new type.

mapError

@NonNull

open fun <E1> mapError(@NonNull errorFun: Expected.Transformer<E, E1>): Expected<E1, V>

Map error to a new type or return encapsulated value.

mapValue

@NonNull

open fun <V1> mapValue(@NonNull valueFun: Expected.Transformer<V, V1>): Expected<E, V1>

Map value to a new type or return the encapsulated error.

onError

@NonNull

open fun onError(@NonNull action: Expected.Action<E>): Expected<E, V>

Execute an action if this expected is an error.

onValue

@NonNull

open fun onValue(@NonNull action: Expected.Action<V>): Expected<E, V>

Execute an action if this expected is an error.

Properties

error

@Nullable

@get:Nullable

private val error: E

value

@Nullable

@get:Nullable

private val value: V