PIbd-21_Balberova_D.N._Sush.../SushiBar/SushiBarFileImplement/DataFileSingleton.cs

57 lines
2.4 KiB
C#

using SushiBarFileImplement.Models;
using System.Xml.Linq;
namespace SushiBarFileImplement
{
public class DataFileSingleton
{
private static DataFileSingleton? instance;
private readonly string IngredientFileName = "Ingredient.xml";
private readonly string OrderFileName = "Order.xml";
private readonly string SushiFileName = "Sushi.xml";
private readonly string ShopFileName = "Shop.xml";
public List<Ingredient> Ingredients { get; private set; }
public List<Order> Orders { get; private set; }
public List<Sushi> ListSushi { get; private set; }
public List<Shop> Shops { get; private set; }
public static DataFileSingleton GetInstance()
{
if (instance == null)
{
instance = new DataFileSingleton();
}
return instance;
}
public void SaveIngredients() => SaveData(Ingredients, IngredientFileName,
"Ingredients", x => x.GetXElement);
public void SaveListSushi() => SaveData(ListSushi, SushiFileName,
"ListSushi", x => x.GetXElement);
public void SaveOrders() => SaveData(Orders, OrderFileName, "Orders", x => x.GetXElement);
public void SaveShops() => SaveData(Shops, ShopFileName, "Shops", x => x.GetXElement);
private DataFileSingleton()
{
Ingredients = LoadData(IngredientFileName, "Ingredient", x => Ingredient.Create(x)!)!;
ListSushi = LoadData(SushiFileName, "Sushi", x => Sushi.Create(x)!)!;
Orders = LoadData(OrderFileName, "Order", x => Order.Create(x)!)!;
Shops = LoadData(ShopFileName, "Shop", x => Shop.Create(x)!)!;
}
private static List<T>? LoadData<T>(string filename, string xmlNodeName,
Func<XElement, T> selectFunction)
{
if (File.Exists(filename))
{
return
XDocument.Load(filename)?.Root?.Elements(xmlNodeName)?.Select(selectFunction)?.ToList();
}
return new List<T>();
}
private static void SaveData<T>(List<T> data, string filename, string
xmlNodeName, Func<T, XElement> selectFunction)
{
if (data != null)
{
new XDocument(new XElement(xmlNodeName, data.Select(selectFunction).ToArray())).Save(filename);
}
}
}
}