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Original Result.kt from Fidesmo code
package com.fidesmo.devicemanager.helpers
// Based on https://github.com/danneu/kotlin-result
typealias NetworkResult<V, E> = Result<V, E>
fun <V, E> Result<V, E>.getOrElse(default: V) = when (this) {
is Result.Ok<V> -> value
is Result.Err<E> -> default
is Result.Loading -> default
}
fun <V, E> Result<V, E>.getOrNull() = when (this) {
is Result.Ok<V> -> value
is Result.Err<E> -> null
is Result.Loading -> null
}
fun <V, V2, E> Result<V, E>.flatMap(transformValue: (V) -> Result<V2, E>): Result<V2, E> = when (this) {
is Result.Ok<V> -> transformValue(value)
is Result.Err<E> -> this
is Result.Loading -> this
}
sealed class Result <out V, out E> {
fun <V2> map(transformValue: (V) -> V2): Result<V2, E> = when (this) {
is Ok -> Ok(transformValue(value))
is Err -> this
is Loading -> this
}
object Loading : Result<Nothing, Nothing>()
data class Ok <out V > internal constructor (val value: V): Result<V, Nothing>() {
override fun toString() = "Result.Ok($value)"
override fun hashCode() = value?.hashCode() ?: 0
override fun equals(other: Any?): Boolean {
if (this === other) return true
return other is Ok<*> && value == other.value
}
}
data class Err <out E> internal constructor (val error: E): Result<Nothing, E>() {
override fun toString() = "Result.Err($error)"
override fun hashCode() = error?.hashCode() ?: 0
override fun equals(other: Any?): Boolean {
if (this === other) return true
return other is Err<*> && error == other.error
}
}
companion object {
// FACTORIES
fun <V> ok (value: V): Result.Ok<V> = Result.Ok(value)
fun <E> err (error: E): Result.Err<E> = Result.Err(error)
// MANY
fun <V, E> all (vararg results: Result<V, E>) = all(results.asIterable())
fun <V, E> all (results: Iterable<Result<V, E>>): Result<List<V>, E> {
return ok(results.map {
when (it) {
is Ok<V> ->
it.value
is Err<E> ->
// Short-circuit
return it
is Loading ->
return it
}
})
}
}
}
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