59 lines
2.4 KiB
C#
59 lines
2.4 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using ComputersShopFileImplement.Models;
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using System.Xml.Linq;
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namespace ComputersShopFileImplement
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{
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internal 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 ComputerFileName = "Computer.xml";
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private readonly string ShopFileName = "Shop.xml";
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public List<Component> Components { get; set; }
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public List<Order> Orders { get; set; }
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public List<Computer> Computers { get; set; }
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public List<Shop> Shops { get; set; }
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private DataFileSingleton()
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{
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Components = LoadData(ComponentFileName, "Component", x => Component.Create(x)!)!;
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Computers = LoadData(ComputerFileName, "Computer", x => Computer.Create(x)!)!;
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Orders = LoadData(OrderFileName, "Order", x => Order.Create(x)!)!;
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Shops = LoadData(ShopFileName, "Shop", x => Shop.Create(x)!)!;
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}
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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, "Components", x => x.GetXElement);
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public void SaveComputers() => SaveData(Computers, ComputerFileName, "Computers", x => x.GetXElement);
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public void SaveOrders() => SaveData(Orders, OrderFileName, "Orders", x => x.GetXElement);
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public void SaveShops() => SaveData(Shops, ShopFileName, "Shops", x => x.GetXElement);
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private static List<T>? LoadData<T>(string filename, string xmlNodeName, 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 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 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, 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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