NSValueTransformer+MTLPredefinedTransformerAdditions.h
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//
// NSValueTransformer+MTLPredefinedTransformerAdditions.h
// Mantle
//
// Created by Justin Spahr-Summers on 2012-09-27.
// Copyright (c) 2012 GitHub. All rights reserved.
//
#import <Foundation/Foundation.h>
// The name for a value transformer that converts strings into URLs and back.
extern NSString * const MTLURLValueTransformerName;
// Ensure an NSNumber is backed by __NSCFBoolean/CFBooleanRef
//
// NSJSONSerialization, and likely other serialization libraries, ordinarily
// serialize NSNumbers as numbers, and thus booleans would be serialized as
// 0/1. The exception is when the NSNumber is backed by __NSCFBoolean, which,
// though very much an implementation detail, is detected and serialized as a
// proper boolean.
extern NSString * const MTLBooleanValueTransformerName;
@interface NSValueTransformer (MTLPredefinedTransformerAdditions)
// Creates a reversible transformer to convert a JSON dictionary into a MTLModel
// object, and vice-versa.
//
// modelClass - The MTLModel subclass to attempt to parse from the JSON. This
// class must conform to <MTLJSONSerializing>. This argument must
// not be nil.
//
// Returns a reversible transformer which uses MTLJSONAdapter for transforming
// values back and forth.
+ (NSValueTransformer *)mtl_JSONDictionaryTransformerWithModelClass:(Class)modelClass;
// Creates a reversible transformer to convert an array of JSON dictionaries
// into an array of MTLModel objects, and vice-versa.
//
// modelClass - The MTLModel subclass to attempt to parse from each JSON
// dictionary. This class must conform to <MTLJSONSerializing>.
// This argument must not be nil.
//
// Returns a reversible transformer which uses MTLJSONAdapter for transforming
// array elements back and forth.
+ (NSValueTransformer *)mtl_JSONArrayTransformerWithModelClass:(Class)modelClass;
// A reversible value transformer to transform between the keys and objects of a
// dictionary.
//
// dictionary - The dictionary whose keys and values should be
// transformed between. This argument must not be nil.
// defaultValue - The result to fall back to, in case no key matching the
// input value was found during a forward transformation.
// reverseDefaultValue - The result to fall back to, in case no value matching
// the input value was found during a reverse
// transformation.
//
// Can for example be used for transforming between enum values and their string
// representation.
//
// NSValueTransformer *valueTransformer = [NSValueTransformer mtl_valueMappingTransformerWithDictionary:@{
// @"foo": @(EnumDataTypeFoo),
// @"bar": @(EnumDataTypeBar),
// } defaultValue: @(EnumDataTypeUndefined) reverseDefaultValue: @"undefined"];
//
// Returns a transformer that will map from keys to values in dictionary
// for forward transformation, and from values to keys for reverse
// transformations. If no matching key or value can be found, the respective
// default value is returned.
+ (NSValueTransformer *)mtl_valueMappingTransformerWithDictionary:(NSDictionary *)dictionary defaultValue:(id)defaultValue reverseDefaultValue:(id)reverseDefaultValue;
// Returns a value transformer created by calling
// `+mtl_valueMappingTransformerWithDictionary:defaultValue:reverseDefaultValue:`
// with a default value of `nil` and a reverse default value of `nil`.
+ (NSValueTransformer *)mtl_valueMappingTransformerWithDictionary:(NSDictionary *)dictionary;
@end
@interface NSValueTransformer (UnavailableMTLPredefinedTransformerAdditions)
+ (NSValueTransformer *)mtl_externalRepresentationTransformerWithModelClass:(Class)modelClass __attribute__((deprecated("Replaced by +mtl_JSONDictionaryTransformerWithModelClass:")));
+ (NSValueTransformer *)mtl_externalRepresentationArrayTransformerWithModelClass:(Class)modelClass __attribute__((deprecated("Replaced by +mtl_JSONArrayTransformerWithModelClass:")));
@end