Helper class for managing an extremely light key-value based db in one or more plist files

GBPlistDB.h

//
//  GBPlistDB.h
//  SensiyaSDK
//
//  Created by Aviel Gross on 3/30/15.
//  Copyright (c) 2015 Globalbit. All rights reserved.
//
// Mostly a wrapper class for the code found here: http://stackoverflow.com/a/6697423/2242359

#import <Foundation/Foundation.h>

@interface GBPlistDB : NSObject

/**
 *  Will create a new plist if not exist
 */
- (NSMutableDictionary *)plistDictionaryForName:(NSString *)name;


/**
 *  If key does note exist, will create the new key-value pair, else updates to value saved under key.
 *  Will create a new plist with the name, if one does not already exists
 *
 *  @param value The value to enter, must be a Property List object
 *  @param key   The key for the value
 *  @param name  The name of the plist file to update
 */
- (void)setValue:(id <NSCoding, NSCopying>)value forKey:(NSString *)key inPlistNamed:(NSString *)name;

/**
 *  @param key  The key for the value
 *  @param name The name of the plist to search for the key
 *  @return The value for the key, or nil
 */
- (id <NSCoding, NSCopying>)valueForKey:(NSString *)key inPlistNamed:(NSString *)name;
@end

GBPlistDB.m

//
//  GBPlistDB.m
//  SensiyaSDK
//
//  Created by Aviel Gross on 3/30/15.
//  Copyright (c) 2015 Globalbit. All rights reserved.
//

#import "GBPlistDB.h"

@implementation GBPlistDB

- (NSString *)plistPathForName:(NSString *)name {
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = paths.firstObject;
    NSString *component = [NSString stringWithFormat:@"%@.plist", name];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:component];
    return path;
}

- (NSMutableDictionary *)plistDictionaryForPath:(NSString *)path {
    NSFileManager *fileManager = [NSFileManager defaultManager];
    
    NSMutableDictionary *data;
    if ([fileManager fileExistsAtPath: path]) {
        data = [NSMutableDictionary dictionaryWithContentsOfFile:path];
    } else {
        data = [NSMutableDictionary dictionary];
    }
    
    return data;
}

- (BOOL)plistExistAtPath:(NSString *)path {
    return [[NSFileManager defaultManager] fileExistsAtPath:path];
}

- (NSMutableDictionary *)plistDictionaryForName:(NSString *)name {
    NSString *path = [self plistPathForName:name];
    return [self plistDictionaryForPath:path];
}

- (void)setValue:(id <NSCoding, NSCopying>)value forKey:(NSString *)key inPlistNamed:(NSString *)name {
    
    NSString *path = [self plistPathForName:name];
    NSMutableDictionary *dict = [self plistDictionaryForPath:name];
    
    [dict setObject:value forKey:key];
    [dict writeToFile:path atomically:YES];
}


- (id <NSCoding, NSCopying>)valueForKey:(NSString *)key inPlistNamed:(NSString *)name {
    NSString *path = [self plistPathForName:name];
    if (![self plistExistAtPath:path]) {
        return nil;
    }

    NSMutableDictionary *plistDict = [self plistDictionaryForPath:path];
    id value = [plistDict objectForKey:key];
    return value;
}


@end