class PetNotificationWrapper {
    let notification: Notification!
    init(notification: Notification) {
        self.notification = notification
    }

    var name: String {
        guard let name = object(for: "name") as? String else { fatalError("name is nil") }
        return name
    }

    var type: String {
        guard let type = object(for: "type") as? String else { fatalError("type is nil") }
        return type
    }

    var age: Int {
        guard let age = object(for: "age") as? Int else { fatalError("age is nil") }
        return age
    }

    var isHungry: Bool {
        guard let isHungry = object(for: "hungry") as? Bool else { fatalError("hungry is nil") }
        return isHungry
    }

    var isScared : Bool {
        guard let isScared = object(for: "scared") as? Bool else { fatalError("scared is nil") }
        return isScared
    }

    func object(for key: String) -> Any? {
        return notification.userInfo?[key]
    }
}