Storage utils for local storage

storage-utils.js

angular.module('storage.utils', [])

.factory('StorageUnit', ['$localStorage', function ($localStorage) {
	function StorageUnit(storageKey) {
		this.storageKey = storageKey;
		this.content = $localStorage[storageKey];
	}

	StorageUnit.prototype.get = function () {
		return this.content;
	};

	StorageUnit.prototype.set = function (data) {
		return $localStorage[this.storageKey] = this.content = data;
	};

	return StorageUnit;
}])


.factory('RetrievableStoredData', ['$http', '$q', 'StorageUnit', function ($http, $q, StorageUnit) {
	function RetrievableStoredData(url, storageUnit, httpConfig) {
		if (angular.isString(storageUnit)) {
			storageUnit = new StorageUnit(storageUnit);
		}
		var self = this;
		this.data = storageUnit.get() || $http.get(url, httpConfig)
			.then(function (response) {
				self.$response = response;
				storageUnit.set(response.data);
				return (self.data = response.data);
			}, function (error) {
				self.$error = error;
				return (self.data = $q.reject(null));
			});
	}

	RetrievableStoredData.prototype.then = function (success, error) {
		return $q.when(this.data).then(success, error);
	};

	return RetrievableStoredData;
}]);