Created
January 15, 2016 12:53
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A simpe JSONObject in swift to wrap around objective c return objects.
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| import Foundation | |
| /// Class for handling errors related to the parent class. | |
| /// | |
| enum JSONValidationErrors: ErrorType, CustomDebugStringConvertible, CustomStringConvertible { | |
| case ExpectedDictionary | |
| case ExpectedArray | |
| case MissingKey(String) | |
| case MissingIndex(Int) | |
| case ConversionFailed(String) | |
| case DateConversionFailed(String) | |
| func localizedFailureReason() -> String { | |
| switch self { | |
| case .ExpectedDictionary: | |
| return NSLocalizedString("Expected to find Dictionary in JSON response.", comment: "Error message to show when reading from a JSON object and a expected dictionary is not found.") | |
| case .ExpectedArray: | |
| return NSLocalizedString("Expected to find Array in JSON response.", comment: "Error message to show when reading from a JSON object and a expected array is not found.") | |
| case MissingKey(let key): | |
| return NSString(format:NSLocalizedString("Missing \"%@\" element in JSON response.", comment: "Error message to show when parsing a JSON dictionary and a expected key is not found."), | |
| "\(key)") as String | |
| case ConversionFailed(let key): | |
| return NSString(format:NSLocalizedString("Failed to convert object to %@ type.", comment: "Error message to show when converstion to a expected type failed."), | |
| "\(key)") as String | |
| case DateConversionFailed(let key): | |
| return NSString(format:NSLocalizedString("Failed to convert %@ to date.", comment: "Error message to show when parsing a JSON dictionary field where a date was expected but the parsing failed."), | |
| "\(key)") as String | |
| case MissingIndex(let index): | |
| return NSString(format:NSLocalizedString("Missing \"%i\" element in response array.", comment:"Error message to show when parsing a JSON array and an expected index is not found."), | |
| index) as String | |
| } | |
| } | |
| func convertToNSError() -> NSError { | |
| let userInfo = [NSLocalizedFailureReasonErrorKey: self.localizedFailureReason()] | |
| return NSError(domain: "JSONValidationErrors", code: self._code, userInfo: userInfo) | |
| } | |
| var description:String{ get { return localizedFailureReason() }} | |
| var debugDescription:String{ get { return localizedFailureReason() }} | |
| } | |
| class JSONObject { | |
| let json: AnyObject? | |
| init(json: AnyObject?){ | |
| self.json = json | |
| } | |
| func dictionary() throws -> [String: AnyObject] { | |
| guard let dictionary = json as? [String: AnyObject] else { | |
| throw JSONValidationErrors.ExpectedDictionary | |
| } | |
| return dictionary; | |
| } | |
| func array() throws -> [AnyObject] { | |
| guard let array = json as? [AnyObject] else { | |
| throw JSONValidationErrors.ExpectedArray | |
| } | |
| return array; | |
| } | |
| func string() throws -> String { | |
| guard let result = json as? String else { | |
| throw JSONValidationErrors.ConversionFailed("String") | |
| } | |
| return result; | |
| } | |
| func double() throws -> Double { | |
| guard let result = json as? Double else { | |
| throw JSONValidationErrors.ConversionFailed("Double") | |
| } | |
| return result; | |
| } | |
| func bool() throws -> Bool { | |
| guard let result = json as? Bool else { | |
| throw JSONValidationErrors.ConversionFailed("Bool") | |
| } | |
| return result; | |
| } | |
| func objectAtKey(key: String) throws -> JSONObject { | |
| guard let dictionary = json as? [String: AnyObject] else { | |
| throw JSONValidationErrors.ExpectedDictionary | |
| } | |
| guard let obj = dictionary[key] else { | |
| throw JSONValidationErrors.MissingKey(key) | |
| } | |
| return JSONObject(json: obj) | |
| } | |
| func objectAtIndex(index: Int) throws -> JSONObject { | |
| guard let array = json as? [AnyObject] else { | |
| throw JSONValidationErrors.ExpectedArray | |
| } | |
| guard (index >= 0) && (index < array.count) else { | |
| throw JSONValidationErrors.MissingIndex(index) | |
| } | |
| let obj = array[index] | |
| return JSONObject(json: obj) | |
| } | |
| func dateWithFormatter(dateFormatter:NSDateFormatter) throws -> NSDate { | |
| let dateString = try self.string() as String | |
| guard let date = dateFormatter.dateFromString(dateString) else { | |
| throw JSONValidationErrors.DateConversionFailed("") | |
| } | |
| return date | |
| } | |
| } |
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