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Created Aug 22, 2014

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//
// Error.swift
// MemoryInvestigation
//
// Created by David Owens II on 8/22/14.
// Copyright (c) 2014 Kiad Software. All rights reserved.
//
public struct Error {
public typealias ErrorInfoDictionary = [String:String]
/// The error code used to differentiate between various error states.
public let code: Int
/// A string that is used to group errors into related error buckets.
public let domain: String
/// A place to store any custom information that needs to be passed along with the error instance.
public let userInfo: ErrorInfoDictionary
/// Initializes a new `Error` instance.
public init(code: Int, domain: String, userInfo: ErrorInfoDictionary?) {
self.code = code
self.domain = domain
if let info = userInfo {
self.userInfo = info
}
else {
self.userInfo = ErrorInfoDictionary()
}
}
/// A single, representative instance of an 'Empty' `Error` object.
//public static let Empty = Error(code: 0, domain: "", userInfo: nil)
}
/// The standard keys used in `Error` and `userInfo`.
public struct ErrorKeys {
private init() {}
public static let LocalizedDescription = "NSLocalizedDescription"
public static let LocalizedFailureReason = "NSLoclalizedFailureReason"
public static let LocalizedRecoverySuggestion = "NSLocalizedRecoverySuggestion"
public static let LocalizedRecoveryOptions = "NSLocalizedRecoveryOptions"
public static let RecoveryAttempter = "NSRecoveryAttempter"
public static let HelpAnchor = "NSHelpAnchor"
public static let StringEncoding = "NSStringEncoding"
public static let URL = "NSURL"
public static let FilePath = "NSFilePath"
}
extension Error {
// /// An initializer that is to be used within your own applications and libraries to hide any of the
// /// ObjC interfaces from your purely Swift APIs.
// public convenience init(_ error: NSErrorPointer) {
// if let memory = error.memory {
// self.code = memory.code
// self.domain = memory.domain
//
// // TODO: Only supports pulling out one key at the moment, more will come later...
// if let info = memory.userInfo {
// self.userInfo = ErrorInfoDictionary()
// if let localizedDescription = info[NSLocalizedDescriptionKey] as? NSString {
// self.userInfo[ErrorKeys.LocalizedDescription] = localizedDescription
// }
// }
// else {
// self.userInfo = ErrorInfoDictionary()
// }
// }
// else {
// self.code = 0
// self.domain = ""
// self.userInfo = ErrorInfoDictionary()
// }
// }
}
extension Error: Printable {
public var description: String {
return "an error..."
}
}
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