architecture/com.splendo.kaluga.architecture.observable/ObservableOptional

ObservableOptional

sealed class ObservableOptional<T> : ReadOnlyProperty<Any?, T?>

Result type for a BaseObservable. Used to allow for the distinction between null and optional values.

Parameters

T

the type this ObservableOptional represents. Can be a nullable.

Inheritors

Types

class Nothing<T> : ObservableOptional<T>

The Observable does not have a result.

data class Value<T>(val value: T) : ObservableOptional<T>

The BaseObservable has a result, this result could be null.

Properties

abstract val valueOrNull: T?

The value of T or null if this result is Nothing.

Functions

fun <R : T, T> ObservableOptional<T>.asResult(defaultValue: ObservableOptional.Value<R>?): ObservableOptional<R>

Casts an ObservableOptional to an ObservableOptional its subtype R or returns defaultValue if no such casting is possible.

abstract operator fun getValue(thisRef: Any?, property: KProperty<*>): T?

resultValueOrDefault

inline fun <R : T, T> ObservableOptional<T>.resultValueOrDefault(defaultValue: R): R

Casts the value of an ObservableOptional to its subtype R or returns defaultValue if no such casting is possible.

toDefaultObservable

fun <R : T, T> ReadOnlyProperty<Any?, T?>.toDefaultObservable(defaultValue: R): ReadOnlyPropertyDefaultObservable<R, T?>

Converts a ReadOnlyProperty into a ReadOnlyPropertyDefaultObservable

toInitializedObservable

fun <T> ReadOnlyProperty<Any?, T>.toInitializedObservable(): ReadOnlyPropertyInitializedObservable<T>

Converts a ReadOnlyProperty into a ReadOnlyPropertyInitializedObservable