#import "NNSection.h"

@implementation NNSection {

@protected

id _key;

NSArray *_objects;

}

- (instancetype)init {

return [self initWithKey:nil objects:nil];

}

- (instancetype)initWithKey:(id)key objects:(NSArray *)objects {

self = [super init];

if (!self) return nil;

_key = key;

_objects = [objects copy] ?: @[];

return self;

}

- (id)objectAtIndexedSubscript:(NSUInteger)idx {

return self.objects[idx];

}

#pragma mark - NSObject

- (BOOL)isEqual:(id)other {

if (other == self) return YES;

if (!other || ![other isKindOfClass:[NNSection class]]) return NO;

return [self isEqualToSectionData:other];

}

- (BOOL)isEqualToSectionData:(NNSection *)other {

if (self.key != other.key && ![self.key isEqual:other.key]) return NO;

if (![self.objects isEqual:other.objects]) return NO;

return YES;

}

- (NSUInteger)hash {

NSUInteger prime = 31;

NSUInteger result = 1;

result = prime * result + [self.key hash];

result = prime * result + [self.objects hash];

return result;

}

#pragma mark - NSCopying

- (id)copyWithZone:(NSZone *)zone {

return [[NNSection allocWithZone:zone] initWithKey:self.key objects:self.objects];

}

#pragma mark - NSMutableCopying

- (id)mutableCopyWithZone:(NSZone *)zone {

return [[NNMutableSection allocWithZone:zone] initWithKey:self.key objects:self.objects];

}

@implementation NNMutableSection

- (instancetype)initWithKey:(id)key objects:(NSArray *)objects {

self = [super initWithKey:key objects:objects];

if (!self) return nil;

_objects = [_objects mutableCopy];

return self;

}

- (void)setKey:(id)key {

_key = key;

}

@dynamic key;

@dynamic objects;