60 lines
2.2 KiB
C#
60 lines
2.2 KiB
C#
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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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public readonly string ComponentFileName = "Component.xml";
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public readonly string OrderFileName = "Order.xml";
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public readonly string ComputerFileName = "Computer.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<Computer> Computers { 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 SaveComputers() => SaveData(Computers, ComputerFileName,
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"Computers", x => x.GetXElement);
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public void SaveOrders() => SaveData(Orders, OrderFileName,
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"Orders", x => x.GetXElement);
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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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}
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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 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,
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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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