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245
xplan-ios/Base/MVP/Model/NSObject+AutoCoding.m
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245
xplan-ios/Base/MVP/Model/NSObject+AutoCoding.m
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//
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// NSObject+AutoCoding.m
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// YYMobileFramework
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//
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// Created by wuwei on 14/6/13.
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// Copyright (c) 2014年 YY Inc. All rights reserved.
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//
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#import "NSObject+AutoCoding.h"
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#import <objc/runtime.h>
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#pragma GCC diagnostic ignored "-Wgnu"
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static NSString *const AutocodingException = @"AutocodingException";
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@implementation NSObject (AutoCoding)
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+ (BOOL)supportsSecureCoding
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{
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return YES;
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}
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+ (instancetype)objectWithContentsOfFile:(NSString *)filePath
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{
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//load the file
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NSData *data = [NSData dataWithContentsOfFile:filePath];
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//attempt to deserialise data as a plist
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id object = nil;
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if (data)
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{
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NSPropertyListFormat format;
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object = [NSPropertyListSerialization propertyListWithData:data options:NSPropertyListImmutable format:&format error:NULL];
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//success?
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if (object)
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{
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//check if object is an NSCoded unarchive
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if ([object respondsToSelector:@selector(objectForKey:)] && [(NSDictionary *)object objectForKey:@"$archiver"])
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{
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object = [NSKeyedUnarchiver unarchiveObjectWithData:data];
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}
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}
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else
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{
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//return raw data
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object = data;
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}
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}
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//return object
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return object;
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}
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- (BOOL)writeToFile:(NSString *)filePath atomically:(BOOL)useAuxiliaryFile
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{
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//note: NSData, NSDictionary and NSArray already implement this method
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//and do not save using NSCoding, however the objectWithContentsOfFile
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//method will correctly recover these objects anyway
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//archive object
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NSData *data = [NSKeyedArchiver archivedDataWithRootObject:self];
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return [data writeToFile:filePath atomically:useAuxiliaryFile];
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}
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+ (NSDictionary *)codableProperties
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{
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unsigned int propertyCount;
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__autoreleasing NSMutableDictionary *codableProperties = [NSMutableDictionary dictionary];
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objc_property_t *properties = class_copyPropertyList(self, &propertyCount);
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for (unsigned int i = 0; i < propertyCount; i++)
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{
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//get property name
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objc_property_t property = properties[i];
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const char *propertyName = property_getName(property);
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__autoreleasing NSString *key = @(propertyName);
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//check if codable
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//get property type
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Class propertyClass = nil;
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char *typeEncoding = property_copyAttributeValue(property, "T");
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switch (typeEncoding[0])
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{
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case '@':
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{
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if (strlen(typeEncoding) >= 3)
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{
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char *className = strndup(typeEncoding + 2, strlen(typeEncoding) - 3);
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__autoreleasing NSString *name = @(className);
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NSRange range = [name rangeOfString:@"<"];
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if (range.location != NSNotFound)
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{
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name = [name substringToIndex:range.location];
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}
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propertyClass = NSClassFromString(name) ?: [NSObject class];
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free(className);
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}
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break;
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}
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case 'c':
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case 'i':
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case 's':
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case 'l':
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case 'q':
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case 'C':
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case 'I':
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case 'S':
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case 'L':
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case 'Q':
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case 'f':
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case 'd':
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case 'B':
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{
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propertyClass = [NSNumber class];
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break;
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}
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case '{':
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{
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propertyClass = [NSValue class];
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break;
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}
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default:
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break;
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}
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free(typeEncoding);
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if (propertyClass && [propertyClass conformsToProtocol:@protocol(NSSecureCoding)])
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{
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//check if there is a backing ivar
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char *ivar = property_copyAttributeValue(property, "V");
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if (ivar)
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{
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//check if ivar has KVC-compliant name
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__autoreleasing NSString *ivarName = @(ivar);
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if ([ivarName isEqualToString:key] || [ivarName isEqualToString:[@"_" stringByAppendingString:key]])
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{
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//no setter, but setValue:forKey: will still work
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codableProperties[key] = propertyClass;
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}
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free(ivar);
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}
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else
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{
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//check if property is dynamic and readwrite
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char *dynamic = property_copyAttributeValue(property, "D");
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char *readonly = property_copyAttributeValue(property, "R");
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if (dynamic && !readonly)
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{
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//no ivar, but setValue:forKey: will still work
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codableProperties[key] = propertyClass;
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}
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free(dynamic);
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free(readonly);
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}
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}
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}
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free(properties);
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return codableProperties;
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}
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- (NSDictionary *)codableProperties
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{
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__autoreleasing NSDictionary *codableProperties = objc_getAssociatedObject([self class], _cmd);
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if (!codableProperties)
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{
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codableProperties = [NSMutableDictionary dictionary];
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Class subclass = [self class];
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while (subclass != [NSObject class])
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{
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[(NSMutableDictionary *)codableProperties addEntriesFromDictionary:[subclass codableProperties]];
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subclass = [subclass superclass];
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}
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codableProperties = [NSDictionary dictionaryWithDictionary:codableProperties];
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//make the association atomically so that we don't need to bother with an @synchronize
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objc_setAssociatedObject([self class], _cmd, codableProperties, OBJC_ASSOCIATION_RETAIN);
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}
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return codableProperties;
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}
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- (NSDictionary *)dictionaryRepresentation
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{
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NSMutableDictionary *dict = [NSMutableDictionary dictionary];
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for (__unsafe_unretained NSString *key in [self codableProperties])
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{
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id value = [self valueForKey:key];
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if (value)
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dict[key] = value;
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else
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dict[key] = @"nil";
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}
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return dict;
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}
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- (void)setWithCoder:(NSCoder *)aDecoder
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{
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BOOL secureAvailable = [aDecoder respondsToSelector:@selector(decodeObjectOfClass:forKey:)];
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BOOL secureSupported = [[self class] supportsSecureCoding];
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NSDictionary *properties = [self codableProperties];
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for (NSString *key in properties)
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{
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id object = nil;
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Class propertyClass = properties[key];
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if (secureAvailable)
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{
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if ([propertyClass isEqual:[NSMutableAttributedString class]]) {
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continue;
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}
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object = [aDecoder decodeObjectOfClass:propertyClass forKey:key];
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}
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else
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{
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if ([propertyClass isEqual:[NSMutableAttributedString class]]) {
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continue;
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}
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object = [aDecoder decodeObjectForKey:key];
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}
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if (object)
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{
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if (secureSupported && ![object isKindOfClass:propertyClass])
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{
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[NSException raise:AutocodingException format:@"Expected '%@' to be a %@, but was actually a %@", key, propertyClass, [object class]];
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}
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[self setValue:object forKey:key];
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}
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}
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}
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- (instancetype)initWithCoder:(NSCoder *)aDecoder
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{
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[self setWithCoder:aDecoder];
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return self;
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}
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- (void)encodeWithCoder:(NSCoder *)aCoder
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{
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for (NSString *key in [self codableProperties])
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{
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id object = [self valueForKey:key];
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if (object) [aCoder encodeObject:object forKey:key];
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}
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}
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@end
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