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March 24, 2017 11:58
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Observable の のエラーをキャッチして Result に入れて受け取ってマッチングして、という作業がめんどくさいと感じたのでオペレータを生やしてみた。
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import RxSwift | |
import Result | |
public struct ResultErrorEnvelope: ErrorType { | |
let originError: ErrorType | |
} | |
public extension ObservableType { | |
public func catchAndConvertToResult() -> Observable<Result<E, ResultErrorEnvelope>> { | |
return map(Result.Success) | |
.catchError { error -> Observable<Result<E, ResultErrorEnvelope>> in | |
return .just(.Failure(.init(originError: error))) | |
} | |
} | |
} | |
public extension ObservableType where E: ResultType { | |
public func filterSuccess() -> Observable<E.Value> { | |
return flatMap { element -> Observable<E.Value> in | |
guard let value = element.value else { | |
return Observable.empty() | |
} | |
return Observable.just(value) | |
} | |
} | |
public func filterFailure() -> Observable<E.Error> { | |
return flatMap { element -> Observable<E.Error> in | |
guard let error = element.error else { | |
return Observable.empty() | |
} | |
return Observable.just(error) | |
} | |
} | |
public func decomposeResult() -> (succeeded: Observable<E.Value>, failured: Observable<E.Error>) { | |
let shared = shareReplay(1) | |
return (shared.filterSuccess(), shared.filterFailure()) | |
} | |
} |
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