BNRIStore.m

//
//  BNRItemStore.m
//  Homepwner
//
//

#import "BNRItemStore.h"
#import "BNRItem.h"


@interface BNRItemStore ()


@property (nonatomic) NSMutableArray *privateItems;


@end


@implementation BNRItemStore

+ (instancetype) sharedStore {

    static BNRItemStore *sharedStore;


    if (!sharedStore) {
        sharedStore = [[BNRItemStore alloc] initPrivate];
    }

    return sharedStore;
}


- (instancetype) init {
    [NSException raise:@"Singleton" format:@"Use +[BNRItemStore sharedStore]"];
    return nil;
}


- (NSArray *) allItems {
    return [self.privateItems copy];
}

- (NSArray *) expensiveItems {
    return [self.expensivePrivate copy];
}

- (NSArray *) cheapItems {
    return [self.privateItems copy];
}

- (instancetype) initPrivate{
    self = [super init]; // Call superclass's designated initializer


    if (self) {
        _privateItems = [[NSMutableArray alloc] init];
    }

    return self;
}


- (BNRItem *) createItem {
    BNRItem *item = [BNRItem randomItem];

    [self.privateItems addObject:item];

    if (item.valueInDollars > 50) {
        [self.expensivePrivate addObject:item];
    }


    return item;
}

@end