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1266 lines (1017 loc) · 46.4 KB
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//
// JSONModel.m
//
// @version 0.13.0
// @author Marin Todorov, http://www.touch-code-magazine.com
//
// Copyright (c) 2012-2013 Marin Todorov, Underplot ltd.
// This code is distributed under the terms and conditions of the MIT license.
//
// 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.
//
// The MIT License in plain English: http://www.touch-code-magazine.com/JSONModel/MITLicense
#if !__has_feature(objc_arc)
#error The JSONMOdel framework is ARC only, you can enable ARC on per file basis.
#endif
#import <objc/runtime.h>
#import <objc/message.h>
#import "JSONModel.h"
#import "JSONModelClassProperty.h"
#import "JSONModelArray.h"
#pragma mark - associated objects names
static const char * kMapperObjectKey;
static const char * kClassPropertiesKey;
static const char * kClassRequiredPropertyNamesKey;
static const char * kIndexPropertyNameKey;
#pragma mark - class static variables
static NSArray* allowedJSONTypes = nil;
static NSArray* allowedPrimitiveTypes = nil;
static JSONValueTransformer* valueTransformer = nil;
static Class JSONModelClass = NULL;
#pragma mark - model cache
static JSONKeyMapper* globalKeyMapper = nil;
#pragma mark - JSONModel implementation
@implementation JSONModel
#pragma mark - initialization methods
+(void)load
{
static dispatch_once_t once;
dispatch_once(&once, ^{
// initialize all class static objects,
// which are common for ALL JSONModel subclasses
@autoreleasepool {
allowedJSONTypes = @[
[NSString class], [NSNumber class], [NSDecimalNumber class], [NSArray class], [NSDictionary class], [NSNull class], //immutable JSON classes
[NSMutableString class], [NSMutableArray class], [NSMutableDictionary class] //mutable JSON classes
];
allowedPrimitiveTypes = @[
@"BOOL", @"float", @"int", @"long", @"double", @"short",
//and some famous aliases
@"NSInteger", @"NSUInteger",
@"Block"
];
valueTransformer = [[JSONValueTransformer alloc] init];
// This is quite strange, but I found the test isSubclassOfClass: (line ~291) to fail if using [JSONModel class].
// somewhat related: https://stackoverflow.com/questions/6524165/nsclassfromstring-vs-classnamednsstring
// //; seems to break the unit tests
JSONModelClass = [JSONModel class];
}
});
}
-(void)__setup__
{
//if first instance of this model, generate the property list
if (!objc_getAssociatedObject(self.class, &kClassPropertiesKey)) {
[self __inspectProperties];
}
//if there's a custom key mapper, store it in the associated object
id mapper = [[self class] keyMapper];
if ( mapper && !objc_getAssociatedObject(self.class, &kMapperObjectKey) ) {
objc_setAssociatedObject(
self.class,
&kMapperObjectKey,
mapper,
OBJC_ASSOCIATION_RETAIN // This is atomic
);
}
}
-(id)init
{
self = [super init];
if (self) {
//do initial class setup
[self __setup__];
}
return self;
}
-(instancetype)initWithData:(NSData *)data error:(NSError *__autoreleasing *)err
{
//turn nsdata to an nsstring
NSString* string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
if (!string) return nil;
//create an instance
JSONModelError* initError = nil;
id objModel = [self initWithString:string usingEncoding:NSUTF8StringEncoding error:&initError];
if (initError && err) *err = initError;
return objModel;
}
-(id)initWithString:(NSString*)string error:(JSONModelError**)err
{
JSONModelError* initError = nil;
id objModel = [self initWithString:string usingEncoding:NSUTF8StringEncoding error:&initError];
if (initError && err) *err = initError;
return objModel;
}
-(id)initWithString:(NSString *)string usingEncoding:(NSStringEncoding)encoding error:(JSONModelError**)err
{
//check for nil input
if (!string) {
if (err) *err = [JSONModelError errorInputIsNil];
return nil;
}
//read the json
JSONModelError* initError = nil;
id obj = [NSJSONSerialization JSONObjectWithData:[string dataUsingEncoding:encoding]
options:kNilOptions
error:&initError];
if (initError) {
if (err) *err = [JSONModelError errorBadJSON];
return nil;
}
//init with dictionary
id objModel = [self initWithDictionary:obj error:&initError];
if (initError && err) *err = initError;
return objModel;
}
-(id)initWithDictionary:(NSDictionary*)dict error:(NSError**)err
{
//check for nil input
if (!dict) {
if (err) *err = [JSONModelError errorInputIsNil];
return nil;
}
//invalid input, just create empty instance
if (![dict isKindOfClass:[NSDictionary class]]) {
if (err) *err = [JSONModelError errorInvalidDataWithMessage:@"Attempt to initialize JSONModel object using initWithDictionary:error: but the dictionary parameter was not an 'NSDictionary'."];
return nil;
}
//create a class instance
self = [self init];
if (!self) {
//super init didn't succeed
if (err) *err = [JSONModelError errorModelIsInvalid];
return nil;
}
//key mapping
JSONKeyMapper* keyMapper = [self __keyMapper];
//check incoming data structure
if (![self __doesDictionary:dict matchModelWithKeyMapper:keyMapper error:err]) {
return nil;
}
//import the data from a dictionary
if (![self __importDictionary:dict withKeyMapper:keyMapper validation:YES error:err]) {
return nil;
}
//run any custom model validation
if (![self validate:err]) {
return nil;
}
//model is valid! yay!
return self;
}
-(JSONKeyMapper*)__keyMapper
{
//get the model key mapper
JSONKeyMapper* keyMapper = objc_getAssociatedObject(self.class, &kMapperObjectKey);
if (!keyMapper && globalKeyMapper) keyMapper = globalKeyMapper;
return keyMapper;
}
-(BOOL)__doesDictionary:(NSDictionary*)dict matchModelWithKeyMapper:(JSONKeyMapper*)keyMapper error:(NSError**)err
{
//check if all required properties are present
NSArray* incomingKeysArray = [dict allKeys];
NSMutableSet* requiredProperties = [self __requiredPropertyNames];
NSSet* incomingKeys = [NSSet setWithArray: incomingKeysArray];
//transform the key names, if neccessary
if (keyMapper) {
NSMutableSet* transformedIncomingKeys = [NSMutableSet setWithCapacity: requiredProperties.count];
NSString* transformedName = nil;
//loop over the required properties list
for (JSONModelClassProperty* property in [self __properties__]) {
//get the mapped key path
transformedName = keyMapper.modelToJSONKeyBlock(property.name);
//chek if exists and if so, add to incoming keys
id value;
@try {
value = [dict valueForKeyPath:transformedName];
}
@catch (NSException *exception) {
value = dict[transformedName];
}
if (value) {
[transformedIncomingKeys addObject: property.name];
}
}
//overwrite the raw incoming list with the mapped key names
incomingKeys = transformedIncomingKeys;
}
//check for missing input keys
if (![requiredProperties isSubsetOfSet:incomingKeys]) {
//get a list of the missing properties
[requiredProperties minusSet:incomingKeys];
//not all required properties are in - invalid input
JMLog(@"Incoming data was invalid [%@ initWithDictionary:]. Keys missing: %@", self.class, requiredProperties);
if (err) *err = [JSONModelError errorInvalidDataWithMissingKeys:requiredProperties];
return NO;
}
//not needed anymore
incomingKeys= nil;
requiredProperties= nil;
return YES;
}
-(BOOL)__importDictionary:(NSDictionary*)dict withKeyMapper:(JSONKeyMapper*)keyMapper validation:(BOOL)validation error:(NSError**)err
{
//loop over the incoming keys and set self's properties
for (JSONModelClassProperty* property in [self __properties__]) {
//convert key name ot model keys, if a mapper is provided
NSString* jsonKeyPath = property.name;
if (keyMapper) jsonKeyPath = keyMapper.modelToJSONKeyBlock( property.name );
//JMLog(@"keyPath: %@", jsonKeyPath);
//general check for data type compliance
id jsonValue;
@try {
jsonValue = [dict valueForKeyPath: jsonKeyPath];
}
@catch (NSException *exception) {
jsonValue = dict[jsonKeyPath];
}
//check for Optional properties
if (isNull(jsonValue)) {
//skip this property, continue with next property
if (property.isOptional || !validation) continue;
if (err) {
//null value for required property
NSString* msg = [NSString stringWithFormat:@"Value of required model key %@ is null", property.name];
JSONModelError* dataErr = [JSONModelError errorInvalidDataWithMessage:msg];
*err = [dataErr errorByPrependingKeyPathComponent:property.name];
}
return NO;
}
Class jsonValueClass = [jsonValue class];
BOOL isValueOfAllowedType = NO;
for (Class allowedType in allowedJSONTypes) {
if ( [jsonValueClass isSubclassOfClass: allowedType] ) {
isValueOfAllowedType = YES;
break;
}
}
if (isValueOfAllowedType==NO) {
//type not allowed
JMLog(@"Type %@ is not allowed in JSON.", NSStringFromClass(jsonValueClass));
if (err) {
NSString* msg = [NSString stringWithFormat:@"Type %@ is not allowed in JSON.", NSStringFromClass(jsonValueClass)];
JSONModelError* dataErr = [JSONModelError errorInvalidDataWithMessage:msg];
*err = [dataErr errorByPrependingKeyPathComponent:property.name];
}
return NO;
}
//check if there's matching property in the model
if (property) {
// check for custom setter, than the model doesn't need to do any guessing
// how to read the property's value from JSON
if ([self __customSetValue:jsonValue forProperty:property]) {
//skip to next JSON key
continue;
};
// 0) handle primitives
if (property.type == nil && property.structName==nil) {
//generic setter
[self setValue:jsonValue forKey: property.name];
//skip directly to the next key
continue;
}
// 0.5) handle nils
if (isNull(jsonValue)) {
[self setValue:nil forKey: property.name];
continue;
}
// 1) check if property is itself a JSONModel
if ([self __isJSONModelSubClass:property.type]) {
//initialize the property's model, store it
JSONModelError* initErr = nil;
id value = [[property.type alloc] initWithDictionary: jsonValue error:&initErr];
if (!value) {
//skip this property, continue with next property
if (property.isOptional || !validation) continue;
// Propagate the error, including the property name as the key-path component
if((err != nil) && (initErr != nil))
{
*err = [initErr errorByPrependingKeyPathComponent:property.name];
}
return NO;
}
[self setValue:value forKey: property.name];
//for clarity, does the same without continue
continue;
} else {
// 2) check if there's a protocol to the property
// ) might or not be the case there's a built in transofrm for it
if (property.protocol) {
//JMLog(@"proto: %@", p.protocol);
jsonValue = [self __transform:jsonValue forProperty:property error:err];
if (!jsonValue) {
if ((err != nil) && (*err == nil)) {
NSString* msg = [NSString stringWithFormat:@"Failed to transform value, but no error was set during transformation. (%@)", property];
JSONModelError* dataErr = [JSONModelError errorInvalidDataWithMessage:msg];
*err = [dataErr errorByPrependingKeyPathComponent:property.name];
}
return NO;
}
}
// 3.1) handle matching standard JSON types
if (property.isStandardJSONType && [jsonValue isKindOfClass: property.type]) {
//mutable properties
if (property.isMutable) {
jsonValue = [jsonValue mutableCopy];
}
//set the property value
[self setValue:jsonValue forKey: property.name];
continue;
}
// 3.3) handle values to transform
if (
(![jsonValue isKindOfClass:property.type] && !isNull(jsonValue))
||
//the property is mutable
property.isMutable
||
//custom struct property
property.structName
) {
// searched around the web how to do this better
// but did not find any solution, maybe that's the best idea? (hardly)
Class sourceClass = [JSONValueTransformer classByResolvingClusterClasses:[jsonValue class]];
//JMLog(@"to type: [%@] from type: [%@] transformer: [%@]", p.type, sourceClass, selectorName);
//build a method selector for the property and json object classes
NSString* selectorName = [NSString stringWithFormat:@"%@From%@:",
(property.structName? property.structName : property.type), //target name
sourceClass]; //source name
SEL selector = NSSelectorFromString(selectorName);
//check for custom transformer
BOOL foundCustomTransformer = NO;
if ([valueTransformer respondsToSelector:selector]) {
foundCustomTransformer = YES;
} else {
//try for hidden custom transformer
selectorName = [NSString stringWithFormat:@"__%@",selectorName];
selector = NSSelectorFromString(selectorName);
if ([valueTransformer respondsToSelector:selector]) {
foundCustomTransformer = YES;
}
}
//check if there's a transformer with that name
if (foundCustomTransformer) {
//it's OK, believe me...
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
//transform the value
jsonValue = [valueTransformer performSelector:selector withObject:jsonValue];
#pragma clang diagnostic pop
[self setValue:jsonValue forKey: property.name];
} else {
// it's not a JSON data type, and there's no transformer for it
// if property type is not supported - that's a programmer mistaked -> exception
@throw [NSException exceptionWithName:@"Type not allowed"
reason:[NSString stringWithFormat:@"%@ type not supported for %@.%@", property.type, [self class], property.name]
userInfo:nil];
return NO;
}
} else {
// 3.4) handle "all other" cases (if any)
[self setValue:jsonValue forKey: property.name];
}
}
}
}
return YES;
}
#pragma mark - property inspection methods
-(BOOL)__isJSONModelSubClass:(Class)class
{
// http://stackoverflow.com/questions/19883472/objc-nsobject-issubclassofclass-gives-incorrect-failure
#ifdef UNIT_TESTING
return [@"JSONModel" isEqualToString: NSStringFromClass([class superclass])];
#else
return [class isSubclassOfClass:JSONModelClass];
#endif
}
//returns a set of the required keys for the model
-(NSMutableSet*)__requiredPropertyNames
{
//fetch the associated property names
NSMutableSet* classRequiredPropertyNames = objc_getAssociatedObject(self.class, &kClassRequiredPropertyNamesKey);
if (!classRequiredPropertyNames) {
classRequiredPropertyNames = [NSMutableSet set];
[[self __properties__] enumerateObjectsUsingBlock:^(JSONModelClassProperty* p, NSUInteger idx, BOOL *stop) {
if (!p.isOptional) [classRequiredPropertyNames addObject:p.name];
}];
//persist the list
objc_setAssociatedObject(
self.class,
&kClassRequiredPropertyNamesKey,
classRequiredPropertyNames,
OBJC_ASSOCIATION_RETAIN // This is atomic
);
}
return classRequiredPropertyNames;
}
//returns a list of the model's properties
-(NSArray*)__properties__
{
//fetch the associated object
NSDictionary* classProperties = objc_getAssociatedObject(self.class, &kClassPropertiesKey);
if (classProperties) return [classProperties allValues];
//if here, the class needs to inspect itself
[self __setup__];
//return the property list
classProperties = objc_getAssociatedObject(self.class, &kClassPropertiesKey);
return [classProperties allValues];
}
//inspects the class, get's a list of the class properties
-(void)__inspectProperties
{
//JMLog(@"Inspect class: %@", [self class]);
NSMutableDictionary* propertyIndex = [NSMutableDictionary dictionary];
//temp variables for the loops
Class class = [self class];
NSScanner* scanner = nil;
NSString* propertyType = nil;
// inspect inherited properties up to the JSONModel class
while (class != [JSONModel class]) {
//JMLog(@"inspecting: %@", NSStringFromClass(class));
unsigned int propertyCount;
objc_property_t *properties = class_copyPropertyList(class, &propertyCount);
//loop over the class properties
for (unsigned int i = 0; i < propertyCount; i++) {
JSONModelClassProperty* p = [[JSONModelClassProperty alloc] init];
//get property name
objc_property_t property = properties[i];
const char *propertyName = property_getName(property);
p.name = @(propertyName);
//JMLog(@"property: %@", p.name);
//get property attributes
const char *attrs = property_getAttributes(property);
NSString* propertyAttributes = @(attrs);
if ([propertyAttributes hasPrefix:@"Tc,"]) {
//mask BOOLs as structs so they can have custom convertors
p.structName = @"BOOL";
}
scanner = [NSScanner scannerWithString: propertyAttributes];
//JMLog(@"attr: %@", [NSString stringWithCString:attrs encoding:NSUTF8StringEncoding]);
[scanner scanUpToString:@"T" intoString: nil];
[scanner scanString:@"T" intoString:nil];
//check if the property is an instance of a class
if ([scanner scanString:@"@\"" intoString: &propertyType]) {
[scanner scanUpToCharactersFromSet:[NSCharacterSet characterSetWithCharactersInString:@"\"<"]
intoString:&propertyType];
//JMLog(@"type: %@", propertyClassName);
p.type = NSClassFromString(propertyType);
p.isMutable = ([propertyType rangeOfString:@"Mutable"].location != NSNotFound);
p.isStandardJSONType = [allowedJSONTypes containsObject:p.type];
//read through the property protocols
while ([scanner scanString:@"<" intoString:NULL]) {
NSString* protocolName = nil;
[scanner scanUpToString:@">" intoString: &protocolName];
if ([protocolName isEqualToString:@"Optional"]) {
p.isOptional = YES;
} else if([protocolName isEqualToString:@"Index"]) {
p.isIndex = YES;
objc_setAssociatedObject(
self.class,
&kIndexPropertyNameKey,
p.name,
OBJC_ASSOCIATION_RETAIN // This is atomic
);
} else if([protocolName isEqualToString:@"ConvertOnDemand"]) {
p.convertsOnDemand = YES;
} else if([protocolName isEqualToString:@"Ignore"]) {
p = nil;
} else if ([self propertyIsReadOnly:p.name]) {
p = nil;
} else {
p.protocol = protocolName;
}
[scanner scanString:@">" intoString:NULL];
}
}
//check if the property is a structure
else if ([scanner scanString:@"{" intoString: &propertyType]) {
[scanner scanCharactersFromSet:[NSCharacterSet alphanumericCharacterSet]
intoString:&propertyType];
p.isStandardJSONType = NO;
p.structName = propertyType;
}
//the property must be a primitive
else {
//the property contains a primitive data type
[scanner scanUpToCharactersFromSet:[NSCharacterSet characterSetWithCharactersInString:@","]
intoString:&propertyType];
//get the full name of the primitive type
propertyType = valueTransformer.primitivesNames[propertyType];
if (![allowedPrimitiveTypes containsObject:propertyType]) {
//type not allowed - programmer mistaked -> exception
@throw [NSException exceptionWithName:@"JSONModelProperty type not allowed"
reason:[NSString stringWithFormat:@"Property type of %@.%@ is not supported by JSONModel.", self.class, p.name]
userInfo:nil];
}
}
NSString *nsPropertyName = @(propertyName);
if([[self class] propertyIsOptional:nsPropertyName]){
p.isOptional = YES;
}
if([[self class] propertyIsIgnored:nsPropertyName]){
p = nil;
}
if([self propertyIsReadOnly:nsPropertyName]) {
p = nil;
}
//add the property object to the temp index
if (p) {
[propertyIndex setValue:p forKey:p.name];
}
}
free(properties);
//ascend to the super of the class
//(will do that until it reaches the root class - JSONModel)
class = [class superclass];
}
//finally store the property index in the static property index
objc_setAssociatedObject(
self.class,
&kClassPropertiesKey,
[propertyIndex copy],
OBJC_ASSOCIATION_RETAIN // This is atomic
);
}
#pragma mark - built-in transformer methods
//few built-in transformations
-(id)__transform:(id)value forProperty:(JSONModelClassProperty*)property error:(NSError**)err
{
Class protocolClass = NSClassFromString(property.protocol);
if (!protocolClass) {
//no other protocols on arrays and dictionaries
//except JSONModel classes
if ([value isKindOfClass:[NSArray class]]) {
@throw [NSException exceptionWithName:@"Bad property protocol declaration"
reason:[NSString stringWithFormat:@"<%@> is not allowed JSONModel property protocol, and not a JSONModel class.", property.protocol]
userInfo:nil];
}
return value;
}
//if the protocol is actually a JSONModel class
if ([self __isJSONModelSubClass:protocolClass]) {
//check if it's a list of models
if ([property.type isSubclassOfClass:[NSArray class]]) {
// Expecting an array, make sure 'value' is an array
if(![[value class] isSubclassOfClass:[NSArray class]])
{
if(err != nil)
{
NSString* mismatch = [NSString stringWithFormat:@"Property '%@' is declared as NSArray<%@>* but the corresponding JSON value is not a JSON Array.", property.name, property.protocol];
JSONModelError* typeErr = [JSONModelError errorInvalidDataWithTypeMismatch:mismatch];
*err = [typeErr errorByPrependingKeyPathComponent:property.name];
}
return nil;
}
if (property.convertsOnDemand) {
//on demand conversion
value = [[JSONModelArray alloc] initWithArray:value modelClass:[protocolClass class]];
} else {
//one shot conversion
JSONModelError* arrayErr = nil;
value = [[protocolClass class] arrayOfModelsFromDictionaries:value error:&arrayErr];
if((err != nil) && (arrayErr != nil))
{
*err = [arrayErr errorByPrependingKeyPathComponent:property.name];
return nil;
}
}
}
//check if it's a dictionary of models
if ([property.type isSubclassOfClass:[NSDictionary class]]) {
// Expecting a dictionary, make sure 'value' is a dictionary
if(![[value class] isSubclassOfClass:[NSDictionary class]])
{
if(err != nil)
{
NSString* mismatch = [NSString stringWithFormat:@"Property '%@' is declared as NSDictionary<%@>* but the corresponding JSON value is not a JSON Object.", property.name, property.protocol];
JSONModelError* typeErr = [JSONModelError errorInvalidDataWithTypeMismatch:mismatch];
*err = [typeErr errorByPrependingKeyPathComponent:property.name];
}
return nil;
}
NSMutableDictionary* res = [NSMutableDictionary dictionary];
for (NSString* key in [value allKeys]) {
JSONModelError* initErr = nil;
id obj = [[[protocolClass class] alloc] initWithDictionary:value[key] error:&initErr];
if (obj == nil)
{
// Propagate the error, including the property name as the key-path component
if((err != nil) && (initErr != nil))
{
initErr = [initErr errorByPrependingKeyPathComponent:key];
*err = [initErr errorByPrependingKeyPathComponent:property.name];
}
return nil;
}
[res setValue:obj forKey:key];
}
value = [NSDictionary dictionaryWithDictionary:res];
}
}
return value;
}
//built-in reverse transormations (export to JSON compliant objects)
-(id)__reverseTransform:(id)value forProperty:(JSONModelClassProperty*)property
{
Class protocolClass = NSClassFromString(property.protocol);
if (!protocolClass) return value;
//if the protocol is actually a JSONModel class
if ([self __isJSONModelSubClass:protocolClass]) {
//check if should export list of dictionaries
if (property.type == [NSArray class] || property.type == [NSMutableArray class]) {
NSMutableArray* tempArray = [NSMutableArray arrayWithCapacity: [(NSArray*)value count] ];
for (id<AbstractJSONModelProtocol> model in (NSArray*)value) {
if ([model respondsToSelector:@selector(toDictionary)]) {
[tempArray addObject: [model toDictionary]];
} else
[tempArray addObject: model];
}
return [tempArray copy];
}
//check if should export dictionary of dictionaries
if (property.type == [NSDictionary class] || property.type == [NSMutableDictionary class]) {
NSMutableDictionary* res = [NSMutableDictionary dictionary];
for (NSString* key in [(NSDictionary*)value allKeys]) {
id<AbstractJSONModelProtocol> model = value[key];
[res setValue: [model toDictionary] forKey: key];
}
return [NSDictionary dictionaryWithDictionary:res];
}
}
return value;
}
#pragma mark - custom transformations
-(BOOL)__customSetValue:(id<NSObject>)value forProperty:(JSONModelClassProperty*)property
{
if (property.setterType == kNotInspected) {
//check for a custom property setter method
NSString* ucfirstName = [property.name stringByReplacingCharactersInRange:NSMakeRange(0,1)
withString:[[property.name substringToIndex:1] uppercaseString]];
NSString* selectorName = [NSString stringWithFormat:@"set%@With%@:", ucfirstName,
[JSONValueTransformer classByResolvingClusterClasses:[value class]]
];
SEL customPropertySetter = NSSelectorFromString(selectorName);
//check if there's a custom selector like this
if (![self respondsToSelector: customPropertySetter]) {
property.setterType = kNo;
return NO;
}
//cache the custom setter selector
property.setterType = kCustom;
property.customSetter = customPropertySetter;
}
if (property.setterType==kCustom) {
//call the custom setter
//https://github.com/steipete
((void (*) (id, SEL, id))objc_msgSend)(self, property.customSetter, value);
return YES;
}
return NO;
}
-(BOOL)__customGetValue:(id<NSObject>*)value forProperty:(JSONModelClassProperty*)property
{
if (property.getterType == kNotInspected) {
//check for a custom property getter method
NSString* ucfirstName = [property.name stringByReplacingCharactersInRange: NSMakeRange(0,1)
withString: [[property.name substringToIndex:1] uppercaseString]];
NSString* selectorName = [NSString stringWithFormat:@"JSONObjectFor%@", ucfirstName];
SEL customPropertyGetter = NSSelectorFromString(selectorName);
if (![self respondsToSelector: customPropertyGetter]) {
property.getterType = kNo;
return NO;
}
property.getterType = kCustom;
property.customGetter = customPropertyGetter;
}
if (property.getterType==kCustom) {
//call the custom getter
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
*value = [self performSelector:property.customGetter withObject:nil];
#pragma clang diagnostic pop
return YES;
}
return NO;
}
#pragma mark - persistance
-(void)__createDictionariesForKeyPath:(NSString*)keyPath inDictionary:(NSMutableDictionary**)dict
{
//find if there's a dot left in the keyPath
NSUInteger dotLocation = [keyPath rangeOfString:@"."].location;
if (dotLocation==NSNotFound) return;
//inspect next level
NSString* nextHierarchyLevelKeyName = [keyPath substringToIndex: dotLocation];
NSDictionary* nextLevelDictionary = (*dict)[nextHierarchyLevelKeyName];
if (nextLevelDictionary==nil) {
//create non-existing next level here
nextLevelDictionary = [NSMutableDictionary dictionary];
}
//recurse levels
[self __createDictionariesForKeyPath:[keyPath substringFromIndex: dotLocation+1]
inDictionary:&nextLevelDictionary ];
//create the hierarchy level
[*dict setValue:nextLevelDictionary forKeyPath: nextHierarchyLevelKeyName];
}
-(NSDictionary*)toDictionary
{
return [self toDictionaryWithKeys:nil];
}
-(NSString*)toJSONString
{
return [self toJSONStringWithKeys:nil];
}
//exports the model as a dictionary of JSON compliant objects
-(NSDictionary*)toDictionaryWithKeys:(NSArray*)propertyNames
{
NSArray* properties = [self __properties__];
NSMutableDictionary* tempDictionary = [NSMutableDictionary dictionaryWithCapacity:properties.count];
id value;
//get the key mapper
JSONKeyMapper* keyMapper = objc_getAssociatedObject(self.class, &kMapperObjectKey);
//if no custom mapper, check for a global mapper
if (keyMapper==nil && globalKeyMapper!=nil) keyMapper = globalKeyMapper;
//loop over all properties
for (JSONModelClassProperty* p in properties) {
//skip if unwanted
if (propertyNames != nil && ![propertyNames containsObject:p.name])
continue;
//fetch key and value
NSString* keyPath = p.name;
value = [self valueForKey: p.name];
//convert the key name, if a key mapper exists
if (keyMapper) keyPath = keyMapper.modelToJSONKeyBlock(keyPath);
//JMLog(@"toDictionary[%@]->[%@] = '%@'", p.name, keyPath, value);
if ([keyPath rangeOfString:@"."].location != NSNotFound) {
//there are sub-keys, introduce dictionaries for them
[self __createDictionariesForKeyPath:keyPath inDictionary:&tempDictionary];
}
//check for custom getter
if ([self __customGetValue:&value forProperty:p]) {
//custom getter, all done
[tempDictionary setValue:value forKeyPath:keyPath];
continue;
}
//export nil when they are not optional values as JSON null, so that the structure of the exported data
//is still valid if it's to be imported as a model again
if (isNull(value)) {
if (p.isOptional)
{
[tempDictionary removeObjectForKey:keyPath];
}
else
{
[tempDictionary setValue:[NSNull null] forKeyPath:keyPath];
}
continue;
}
//check if the property is another model
if ([value isKindOfClass:JSONModelClass]) {
//recurse models
value = [(JSONModel*)value toDictionary];
[tempDictionary setValue:value forKeyPath: keyPath];
//for clarity
continue;
} else {
// 1) check for built-in transformation
if (p.protocol) {
value = [self __reverseTransform:value forProperty:p];
}
// 2) check for standard types OR 2.1) primitives
if (p.structName==nil && (p.isStandardJSONType || p.type==nil)) {
//generic get value
[tempDictionary setValue:value forKeyPath: keyPath];
continue;
}
// 3) try to apply a value transformer
if (YES) {
//create selector from the property's class name
NSString* selectorName = [NSString stringWithFormat:@"%@From%@:", @"JSONObject", p.type?p.type:p.structName];
SEL selector = NSSelectorFromString(selectorName);
BOOL foundCustomTransformer = NO;
if ([valueTransformer respondsToSelector:selector]) {
foundCustomTransformer = YES;
} else {
//try for hidden transformer
selectorName = [NSString stringWithFormat:@"__%@",selectorName];
selector = NSSelectorFromString(selectorName);
if ([valueTransformer respondsToSelector:selector]) {
foundCustomTransformer = YES;
}
}
//check if there's a transformer declared