PIbd-21_Belianin_N.N._Furni.../FurnitureAssembly/FurnitureAssemblyFileImplement/DataFileSingleton.cs

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C#
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using FurnitureAssemblyFileImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;
namespace FurnitureAssemblyFileImplement
{
internal class DataFileSingleton
{
private static DataFileSingleton? instance;
private readonly string WorkPieceFileName = "WorkPiece.xml";
private readonly string OrderFileName = "Order.xml";
private readonly string FurnitureFileName = "Furniture.xml";
public List<WorkPiece> WorkPieces { get; private set; }
public List<Order> Orders { get; private set; }
public List<Furniture> Furnitures { get; private set; }
public static DataFileSingleton GetInstance()
{
if (instance == null)
{
instance = new DataFileSingleton();
}
return instance;
}
public void SaveWorkPieces() => SaveData(WorkPieces, WorkPieceFileName, "WorkPieces", x => x.GetXElement);
public void SaveFurnitures() => SaveData(Furnitures, FurnitureFileName, "Furnitures", x => x.GetXElement);
public void SaveOrders() => SaveData(Orders, OrderFileName, "Orders", x => x.GetXElement);
private DataFileSingleton()
{
WorkPieces = LoadData(WorkPieceFileName, "WorkPiece", x => WorkPiece.Create(x)!)!;
Furnitures = LoadData(FurnitureFileName, "Furniture", x => Furniture.Create(x)!)!;
Orders = LoadData(OrderFileName, "Order", x => Order.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);
}
}
}
}