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`DecoderType` is a new protocol that better encapsulates the idea of decoding an object from a given `JSON`. It allows for two abilities that `JSONDecodable` did not: 1) Multiple decoders for the same type can be defined. This is illustrated by the two `NSDate` decoders provided by Alexander. 2) The decoder type is separate from the type being decoded. `JSONDecodable` is now deprecated.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| // | ||
| // DecoderType.swift | ||
| // Alexander | ||
| // | ||
| // Created by Caleb Davenport on 11/18/15. | ||
| // Copyright © 2015 Hodinkee. All rights reserved. | ||
| // | ||
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| public protocol DecoderType { | ||
| typealias Value | ||
| static func decode(JSON: Alexander.JSON) -> Value? | ||
| } | ||
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| extension JSON { | ||
| public func decode<T: DecoderType>(decoder: T.Type) -> T.Value? { | ||
| return decode(T.decode) | ||
| } | ||
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| public func decodeArray<T: DecoderType>(decoder: T.Type) -> [T.Value]? { | ||
| return decodeArray(T.decode) | ||
| } | ||
| } | ||
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| public struct NSTimeIntervalDecoder: DecoderType { | ||
| public typealias Value = NSTimeInterval | ||
| public static func decode(JSON: Alexander.JSON) -> Value? { | ||
| return JSON.object as? NSTimeInterval | ||
| } | ||
| } | ||
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| public struct NSDateTimeIntervalSince1970Decoder: DecoderType { | ||
| public typealias Value = NSDate | ||
| public static func decode(JSON: Alexander.JSON) -> Value? { | ||
| return NSTimeIntervalDecoder.decode(JSON).flatMap({ NSDate(timeIntervalSince1970: $0) }) | ||
| } | ||
| } | ||
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| public struct NSDateTimeIntervalSinceReferenceDateDecoder: DecoderType { | ||
| public typealias Value = NSDate | ||
| public static func decode(JSON: Alexander.JSON) -> Value? { | ||
| return NSTimeIntervalDecoder.decode(JSON).flatMap({ NSDate(timeIntervalSinceReferenceDate: $0) }) | ||
| } | ||
| } | ||
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| public struct NSURLDecoder: DecoderType { | ||
| public typealias Value = NSURL | ||
| public static func decode(JSON: Alexander.JSON) -> Value? { | ||
| return JSON.stringValue.flatMap({ NSURL(string: $0) }) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| // | ||
| // UserDecoderTests.swift | ||
| // Alexander | ||
| // | ||
| // Created by Caleb Davenport on 11/18/15. | ||
| // Copyright © 2015 Hodinkee. All rights reserved. | ||
| // | ||
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| import XCTest | ||
| import Alexander | ||
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| final class UserDecoderTests: XCTestCase { | ||
| func testDecodeValidUser() { | ||
| let user = User(ID: "1", name: "Caleb") | ||
| let object = [ "id": user.ID, "name": user.name ] | ||
| let JSON = Alexander.JSON(object: object) | ||
| guard let decodedUser = JSON.decode(UserDecoder) else { | ||
| XCTFail() | ||
| return | ||
| } | ||
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| XCTAssertEqual(decodedUser.ID, user.ID) | ||
| XCTAssertEqual(decodedUser.name, user.name) | ||
| } | ||
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| func testDecodeValidUsersArray() { | ||
| let users = [ | ||
| User(ID: "1", name: "Caleb"), | ||
| User(ID: "2", name: "Jon") | ||
| ] | ||
| let object = [ | ||
| "users": [ | ||
| [ "id": users[0].ID, "name": users[0].name ], | ||
| [ "id": users[1].ID, "name": users[1].name ] | ||
| ] | ||
| ] | ||
| let JSON = Alexander.JSON(object: object) | ||
| guard let decodedUsers = JSON["users"]?.decodeArray(UserDecoder) where decodedUsers.count == 2 else { | ||
| XCTFail() | ||
| return | ||
| } | ||
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| XCTAssertEqual(decodedUsers.count, 2) | ||
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| XCTAssertEqual(decodedUsers[0].ID, users[0].ID) | ||
| XCTAssertEqual(decodedUsers[0].name, users[0].name) | ||
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| XCTAssertEqual(decodedUsers[1].ID, users[1].ID) | ||
| XCTAssertEqual(decodedUsers[1].name, users[1].name) | ||
| } | ||
| } | ||
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| struct User { | ||
| var ID: String | ||
| var name: String | ||
| } | ||
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| struct UserDecoder: DecoderType { | ||
| typealias Value = User | ||
| static func decode(JSON: Alexander.JSON) -> Value? { | ||
| guard let ID = JSON["id"]?.stringValue, let name = JSON["name"]?.stringValue else { | ||
| return nil | ||
| } | ||
| return User(ID: ID, name: name) | ||
| } | ||
| } |