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ImmutableMappable.swift
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ImmutableMappable.swift
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//
// ImmutableMappble.swift
// ObjectMapper
//
// Created by Suyeol Jeon on 23/09/2016.
//
// The MIT License (MIT)
//
// Copyright (c) 2014-2016 Hearst
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
public protocol ImmutableMappable: BaseMappable {
init(map: Map) throws
}
public extension ImmutableMappable {
/// Implement this method to support object -> JSON transform.
public func mapping(map: Map) {}
/// Initializes object from a JSON String
public init(JSONString: String, context: MapContext? = nil) throws {
self = try Mapper(context: context).map(JSONString: JSONString)
}
/// Initializes object from a JSON Dictionary
public init(JSON: [String: Any], context: MapContext? = nil) throws {
self = try Mapper(context: context).map(JSON: JSON)
}
/// Initializes object from a JSONObject
public init(JSONObject: Any, context: MapContext? = nil) throws {
self = try Mapper(context: context).map(JSONObject: JSONObject)
}
}
public extension Map {
fileprivate func currentValue(for key: String) -> Any? {
return self[key].currentValue
}
// MARK: Basic
/// Returns a value or throws an error.
public func value<T>(_ key: String, file: StaticString = #file, function: StaticString = #function, line: UInt = #line) throws -> T {
let currentValue = self.currentValue(for: key)
guard let value = currentValue as? T else {
throw MapError(key: key, currentValue: currentValue, reason: "Cannot cast to '\(T.self)'", file: file, function: function, line: line)
}
return value
}
/// Returns a transformed value or throws an error.
public func value<Transform: TransformType>(_ key: String, using transform: Transform, file: StaticString = #file, function: StaticString = #function, line: UInt = #line) throws -> Transform.Object {
let currentValue = self.currentValue(for: key)
guard let value = transform.transformFromJSON(currentValue) else {
throw MapError(key: key, currentValue: currentValue, reason: "Cannot transform to '\(Transform.Object.self)' using \(transform)", file: file, function: function, line: line)
}
return value
}
// MARK: BaseMappable
/// Returns a `BaseMappable` object or throws an error.
public func value<T: BaseMappable>(_ key: String) throws -> T {
let currentValue = self.currentValue(for: key)
return try Mapper<T>().mapOrFail(JSONObject: currentValue)
}
// MARK: [BaseMappable]
/// Returns a `[BaseMappable]` or throws an error.
public func value<T: BaseMappable>(_ key: String, file: StaticString = #file, function: StaticString = #function, line: UInt = #line) throws -> [T] {
let currentValue = self.currentValue(for: key)
guard let jsonArray = currentValue as? [Any] else {
throw MapError(key: key, currentValue: currentValue, reason: "Cannot cast to '[Any]'", file: file, function: function, line: line)
}
return try jsonArray.enumerated().map { i, JSONObject -> T in
return try Mapper<T>().mapOrFail(JSONObject: JSONObject)
}
}
/// Returns a `[BaseMappable]` using transform or throws an error.
public func value<Transform: TransformType>(_ key: String, using transform: Transform, file: StaticString = #file, function: StaticString = #function, line: UInt = #line) throws -> [Transform.Object] {
let currentValue = self.currentValue(for: key)
guard let jsonArray = currentValue as? [Any] else {
throw MapError(key: key, currentValue: currentValue, reason: "Cannot cast to '[Any]'", file: file, function: function, line: line)
}
return try jsonArray.enumerated().map { i, json -> Transform.Object in
guard let object = transform.transformFromJSON(json) else {
throw MapError(key: "\(key)[\(i)]", currentValue: json, reason: "Cannot transform to '\(Transform.Object.self)' using \(transform)", file: file, function: function, line: line)
}
return object
}
}
// MARK: [String: BaseMappable]
/// Returns a `[String: BaseMappable]` or throws an error.
public func value<T: BaseMappable>(_ key: String, file: StaticString = #file, function: StaticString = #function, line: UInt = #line) throws -> [String: T] {
let currentValue = self.currentValue(for: key)
guard let jsonDictionary = currentValue as? [String: Any] else {
throw MapError(key: key, currentValue: currentValue, reason: "Cannot cast to '[String: Any]'", file: file, function: function, line: line)
}
var value: [String: T] = [:]
for (key, json) in jsonDictionary {
value[key] = try Mapper<T>().mapOrFail(JSONObject: json)
}
return value
}
/// Returns a `[String: BaseMappable]` using transform or throws an error.
public func value<Transform: TransformType>(_ key: String, using transform: Transform, file: StaticString = #file, function: StaticString = #function, line: UInt = #line) throws -> [String: Transform.Object] {
let currentValue = self.currentValue(for: key)
guard let jsonDictionary = currentValue as? [String: Any] else {
throw MapError(key: key, currentValue: currentValue, reason: "Cannot cast to '[String: Any]'", file: file, function: function, line: line)
}
var value: [String: Transform.Object] = [:]
for (key, json) in jsonDictionary {
guard let object = transform.transformFromJSON(json) else {
throw MapError(key: key, currentValue: json, reason: "Cannot transform to '\(Transform.Object.self)' using \(transform)", file: file, function: function, line: line)
}
value[key] = object
}
return value
}
}
public extension Mapper where N: ImmutableMappable {
public func map(JSON: [String: Any]) throws -> N {
return try self.mapOrFail(JSON: JSON)
}
public func map(JSONString: String) throws -> N {
return try mapOrFail(JSONString: JSONString)
}
public func map(JSONObject: Any) throws -> N {
return try mapOrFail(JSONObject: JSONObject)
}
// MARK: Array mapping functions
public func mapArray(JSONArray: [[String: Any]]) throws -> [N] {
return try JSONArray.flatMap(mapOrFail)
}
public func mapArray(JSONString: String) throws -> [N] {
guard let JSONObject = Mapper.parseJSONString(JSONString: JSONString) else {
throw MapError(key: nil, currentValue: JSONString, reason: "Cannot convert string into Any'")
}
return try mapArray(JSONObject: JSONObject)
}
public func mapArray(JSONObject: Any) throws -> [N] {
guard let JSONArray = JSONObject as? [[String: Any]] else {
throw MapError(key: nil, currentValue: JSONObject, reason: "Cannot cast to '[[String: Any]]'")
}
return try mapArray(JSONArray: JSONArray)
}
}
internal extension Mapper where N: BaseMappable {
internal func mapOrFail(JSON: [String: Any]) throws -> N {
let map = Map(mappingType: .fromJSON, JSON: JSON, context: context)
// Check if object is ImmutableMappable, if so use ImmutableMappable protocol for mapping
if let klass = N.self as? ImmutableMappable.Type,
var object = try klass.init(map: map) as? N {
object.mapping(map: map)
return object
}
// If not, map the object the standard way
guard let value = self.map(JSON: JSON) else {
throw MapError(key: nil, currentValue: JSON, reason: "Cannot map to '\(N.self)'")
}
return value
}
internal func mapOrFail(JSONString: String) throws -> N {
guard let JSON = Mapper.parseJSONStringIntoDictionary(JSONString: JSONString) else {
throw MapError(key: nil, currentValue: JSONString, reason: "Cannot parse into '[String: Any]'")
}
return try mapOrFail(JSON: JSON)
}
internal func mapOrFail(JSONObject: Any) throws -> N {
guard let JSON = JSONObject as? [String: Any] else {
throw MapError(key: nil, currentValue: JSONObject, reason: "Cannot cast to '[String: Any]'")
}
return try mapOrFail(JSON: JSON)
}
}