TimeZone : Codable implemented

Author: bubski

Foundation/TimeZone.swift

@@ -280,3 +280,26 @@ extension TimeZone {
         return result!
     }
 }
+
+extension TimeZone : Codable {
+    private enum CodingKeys : Int, CodingKey {
+        case identifier
+    }
+
+    public init(from decoder: Decoder) throws {
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        let identifier = try container.decode(String.self, forKey: .identifier)
+
+        guard let timeZone = TimeZone(identifier: identifier) else {
+            throw DecodingError.dataCorrupted(DecodingError.Context(codingPath: decoder.codingPath,
+                                                                    debugDescription: "Invalid TimeZone identifier."))
+        }
+
+        self = timeZone
+    }
+
+    public func encode(to encoder: Encoder) throws {
+        var container = encoder.container(keyedBy: CodingKeys.self)
+        try container.encode(self.identifier, forKey: .identifier)
+    }
+}

TestFoundation/TestCodable.swift

@@ -305,6 +305,18 @@ class TestCodable : XCTestCase {
         }
     }
 
+    // MARK: - TimeZone
+    lazy var timeZoneValues: [TimeZone] = [
+        TimeZone(identifier: "America/Los_Angeles")!,
+        TimeZone(identifier: "UTC")!,
+        TimeZone.current
+    ]
+
+    func test_TimeZone_JSON() {
+        for timeZone in timeZoneValues {
+            expectRoundTripEqualityThroughJSON(for: timeZone)
+        }
+    }
 }
 
 extension TestCodable {
@@ -323,6 +335,7 @@ extension TestCodable {
             ("test_CGSize_JSON", test_CGSize_JSON),
             ("test_CGRect_JSON", test_CGRect_JSON),
             ("test_CharacterSet_JSON", test_CharacterSet_JSON),
+            ("test_TimeZone_JSON", test_TimeZone_JSON),
         ]
     }
 }