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Pods/PromisesSwift/Sources/Promises/PromiseError.swift

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