Created
June 20, 2017 18:25
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Result enum that doesn't stop the stream
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import RxSwift | |
protocol ApiResultType { | |
associatedtype ResultType | |
var result: ApiResult<ResultType> { get } | |
} | |
enum ApiResult<T>: ApiResultType { | |
typealias ResultType = T | |
case success(T) | |
case error(Error) | |
var result: ApiResult<ResultType> { | |
return self | |
} | |
func map<E>(_ transform: (T) -> E) -> ApiResult<E> { | |
switch self { | |
case let .success(value): | |
return .success(transform(value)) | |
case let .error(error): | |
return .error(error) | |
} | |
} | |
} | |
typealias ApiObservable<E> = Observable<ApiResult<E>> | |
extension ObservableType { | |
func apiResult() -> ApiObservable<E> { | |
return map({ ApiResult.success($0) }).catchError({ .just(ApiResult.error($0)) }) | |
} | |
} | |
extension Observable where Element: ApiResultType { | |
func apiFlatMap<T>(_ transform: @escaping (Element.ResultType) -> ApiObservable<T>) -> ApiObservable<T> { | |
return flatMap({ (element: Element) -> ApiObservable<T> in | |
switch element.result { | |
case let .success(some): | |
return transform(some) | |
case let .error(error): | |
return ApiObservable<T>.just(.error(error)) | |
} | |
}) | |
} | |
} |
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