58 lines
2.1 KiB
C#
58 lines
2.1 KiB
C#
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using FoodOrdersFileImplement.Models;
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using System.Xml.Linq;
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namespace FoodOrdersFileImplement
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{
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public class DataFileSingleton
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{
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private static DataFileSingleton? instance;
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private readonly string ComponentFileName = "Component.xml";
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private readonly string OrderFileName = "Order.xml";
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private readonly string DishFileName = "Dish.xml";
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public List<Component> Components { get; private set; }
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public List<Order> Orders { get; private set; }
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public List<Dish> Dishes { get; private set; }
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public static DataFileSingleton GetInstance()
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{
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if (instance == null)
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{
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instance = new DataFileSingleton();
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}
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return instance;
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}
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public void SaveComponents() => SaveData(Components, ComponentFileName,
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"Components", x => x.GetXElement);
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public void SaveDishes() => SaveData(Dishes, DishFileName,
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"Dishes", x => x.GetXElement);
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public void SaveOrders() => SaveData(Orders, OrderFileName, "Orders", x
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=> x.GetXElement);
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private DataFileSingleton()
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{
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Components = LoadData(ComponentFileName, "Component", x =>
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Component.Create(x)!)!;
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Dishes = LoadData(DishFileName, "Dish", x =>
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Dish.Create(x)!)!;
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Orders = LoadData(OrderFileName, "Order", x => Order.Create(x)!)!;
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}
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private static List<T>? LoadData<T>(string filename, string xmlNodeName,
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Func<XElement, T> selectFunction)
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{
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if (File.Exists(filename))
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{
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return
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XDocument.Load(filename)?.Root?.Elements(xmlNodeName)?.Select(selectFunction)?.ToList();
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}
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return new List<T>();
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}
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private static void SaveData<T>(List<T> data, string filename, string
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xmlNodeName, Func<T, XElement> selectFunction)
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{
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if (data != null)
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{
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new XDocument(new XElement(xmlNodeName,
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data.Select(selectFunction).ToArray())).Save(filename);
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}
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}
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}
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}
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