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CWStorage.m
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CWStorage.m
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//
// CWStorage.m
// Copyright (c) 2013 Kevin Randrup. All rights reserved.
//
#import "CWStorage.h"
#import <objc/runtime.h>
@interface CWStorage ()
@end
@implementation CWStorage {
NSMutableDictionary *_classNames; //Avoiding use of @properties
NSMutableDictionary *_notificationBlocks;
id <CWCustomClassStorage>_customClassStorageDelegate;
}
#pragma mark - Instance variable setters and getters
#define CLASS_NAMES_STORAGE @"CWStorageClassNameStorage"
- (NSMutableDictionary *)classNames
{
if (_classNames == nil) _classNames = [NSMutableDictionary dictionary];
return _classNames;
}
- (NSMutableDictionary *)notificationBlocks
{
if (_notificationBlocks == nil) _notificationBlocks = [NSMutableDictionary dictionary];
return _notificationBlocks;
}
- (id)customClassStorageDelegate
{
return _customClassStorageDelegate;
}
- (void)setCustomClassStorageDelegate:(id<CWCustomClassStorage>)customClassStorageDelegate
{
_customClassStorageDelegate = customClassStorageDelegate;
}
#pragma mark - Setup/Teardown
+ (instancetype)sharedStorage
{
static id sharedInstance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedInstance = [[self alloc] init];
[sharedInstance setup];
});
return sharedInstance;
}
- (id)copyWithZone:(NSZone *)zone
{
return self;
}
- (NSString *)classNameForPropertyName:(NSString *)propertyName
{
NSString *className = [self classNames][propertyName];
return className;
}
- (void)setClass:(NSString *)class forProperty:(NSString *)propertyName
{
[[self classNames] setObject:class forKey:propertyName];
}
//Iterates through all properties, and replaces their implementations
- (void)setup
{
unsigned int numberOfProperties;
objc_property_t *propertyArray = class_copyPropertyList([self class], &numberOfProperties);
for (NSUInteger i = 0; i < numberOfProperties; i++) {
objc_property_t property = propertyArray[i];
const char *attributes = property_getAttributes(property);
NSString *getterName = [[NSString alloc] initWithUTF8String:property_getName(property)];
Method getter = class_getInstanceMethod([self class], @selector(newGetter));
IMP getterImplementation = method_getImplementation(getter);
SEL originalGetterMethodSelector = NSSelectorFromString(getterName);
Method originalGetterMethod = class_getInstanceMethod([self class], originalGetterMethodSelector);
method_setImplementation(originalGetterMethod, getterImplementation);
NSString *setterName = [self setterForGetter:getterName];
Method setter = class_getInstanceMethod([self class], @selector(newSetter:));
IMP setterImplementation = method_getImplementation(setter);
SEL originalSetterMethodSelector = NSSelectorFromString(setterName);
Method originalSetterMethod = class_getInstanceMethod([self class], originalSetterMethodSelector);
method_setImplementation(originalSetterMethod, setterImplementation);
NSString *getterAttributes = [NSString stringWithUTF8String:attributes];
NSString *className = [getterAttributes componentsSeparatedByString:@"\""][1]; //The class name inside the quotation marks. "UIImage" -> UIImage
[self setClass:className forProperty:getterName];
}
}
#pragma mark - Storing/Retreiving Data
- (NSString *)filePathForPropertyName:(NSString *)getterName
{
static NSString *writeableDirectoryPath = nil;
if (writeableDirectoryPath == nil) writeableDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) firstObject];
NSString *filePath = [writeableDirectoryPath stringByAppendingPathComponent:getterName];
return filePath;
}
- (id)retreiveObjectOfClass:(NSString *)classString withFilePath:(NSString *)filePath
{
id returnObject = nil;
Class class = NSClassFromString(classString);
if ([class conformsToProtocol:@protocol(NSCoding)]) {
returnObject = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
}
else if (self.customClassStorageDelegate) {
returnObject = [self.customClassStorageDelegate retreiveObjectOfClass:classString withFilePath:filePath];
}
return returnObject;
}
- (void)archiveObject:(id)object ofClass:(NSString *)classString withFilePath:(NSString *)filePath
{
if ([object conformsToProtocol:@protocol(NSCoding)]) {
[NSKeyedArchiver archiveRootObject:object toFile:filePath];
}
else if (self.customClassStorageDelegate) {
[self.customClassStorageDelegate archiveObject:object ofClass:classString withFilePath:filePath];
}
}
#pragma mark - Setters and Getters
- (NSString *)getterForSetter:(NSString *)setter //setName:
{
NSMutableString *getterString = [setter mutableCopy]; //setName:
[getterString deleteCharactersInRange:NSMakeRange(0, 3)]; //Name:
NSString *firstCharacter = [[getterString substringToIndex:1] lowercaseString]; //n
NSRange firstCharacterRange = NSMakeRange(0, 1);
[getterString replaceCharactersInRange:firstCharacterRange withString:firstCharacter]; //name:
NSRange colonRange = NSMakeRange([getterString length] - 1, 1);
[getterString deleteCharactersInRange:colonRange]; //name
return getterString;
}
- (NSString *)setterForGetter:(NSString *)getter //name
{
NSMutableString *setterString = [getter mutableCopy]; //name
NSString *firstCharacter = [[getter substringToIndex:1] capitalizedString]; //N
[setterString replaceCharactersInRange:NSMakeRange(0, 1) withString:firstCharacter]; //Name
[setterString insertString:@"set" atIndex:0]; //setName
[setterString appendString:@":"]; //setName:
return setterString;
}
//Generic setter
- (void)newSetter:(id)newValue
{
NSString *setterName = NSStringFromSelector(_cmd);
NSString *getterName = [self getterForSetter:setterName];
NSString *className = [self classNameForPropertyName:getterName];
NSString *filePath = [self filePathForPropertyName:getterName];
if (newValue) {
[self archiveObject:newValue ofClass:className withFilePath:filePath];
[[NSNotificationCenter defaultCenter] postNotificationName:[self notificationNameForPropertyName:getterName] object:self userInfo:@{getterName:newValue}];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,
(unsigned long)NULL), ^(void) {
[[self notificationBlocks] enumerateKeysAndObjectsUsingBlock:^(NSString *key, void(^ChangedSettingBlock)(id changedSetting) , BOOL *stop) {
if ([key isEqualToString:getterName]) {
dispatch_async(dispatch_get_main_queue(), ^{
ChangedSettingBlock(newValue);
});
}
}];
});
}
else {
NSError *error = nil;
BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:filePath];
if (fileExists) {
if (![[NSFileManager defaultManager] removeItemAtPath:filePath error:&error])
NSLog(@"Error deleting file at path: %@", filePath);
}
}
}
//Generic getter
- (id)newGetter
{
NSString *getterName = NSStringFromSelector(_cmd);
NSString *className = [self classNameForPropertyName:getterName];
NSString *filePath = [self filePathForPropertyName:getterName];
return [self retreiveObjectOfClass:className withFilePath:filePath];;
}
#pragma mark - Notifications
- (NSString *)notificationNameForPropertyName:(NSString *)propertyName
{
return [NSString stringWithFormat:@"CWStoragePropertyWasSet - %@", propertyName];
}
- (void)setNotificationBlock:(void(^)(id changedSetting))notificationBlock forPropertyName:(NSString *)propertyName
{
[[self notificationBlocks] setObject:[notificationBlock copy] forKey:propertyName];
}
@end