59 lines
1.7 KiB
Swift
59 lines
1.7 KiB
Swift
// Copyright 2018 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at:
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import FBLPromises
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/// Internal errors that `Promise` can throw.
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/// Indirectly conforms to `Swift.Error` through conformance to `Swift.CustomNSError` below.
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/// Not placing it under extension `Promise` for convenience to avoid collisions with `Swift.Error`.
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public enum PromiseError {
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case timedOut
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case validationFailure
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}
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/// Downcasting from `Swift.Error`.
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extension PromiseError {
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public init?(_ error: Error) {
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let error = error as NSError
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if error.domain != __FBLPromiseErrorDomain { return nil }
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switch error.code {
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case __FBLPromiseErrorCode.timedOut.rawValue:
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self = .timedOut
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case __FBLPromiseErrorCode.validationFailure.rawValue:
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self = .validationFailure
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default:
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return nil
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}
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}
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}
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extension PromiseError: CustomNSError {
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public static var errorDomain: String {
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return __FBLPromiseErrorDomain
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}
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public var errorCode: Int {
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switch self {
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case .timedOut:
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return __FBLPromiseErrorCode.timedOut.rawValue
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case .validationFailure:
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return __FBLPromiseErrorCode.validationFailure.rawValue
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}
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}
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public var errorUserInfo: [String: Any] {
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return [String: Any]()
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}
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}
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