using FlowerShopFileImplement.Models; using System.Xml.Linq; namespace FlowerShopFileImplement { internal class DataFileSingleton { private static DataFileSingleton? instance; private readonly string ComponentFileName = "Component.xml"; private readonly string OrderFileName = "Order.xml"; private readonly string FlowerFileName = "Flower.xml"; private readonly string ClientFileName = "Client.xml"; private readonly string ShopFileName = "Shop.xml"; public List Components { get; private set; } public List Orders { get; private set; } public List Flowers { get; private set; } public List Clients { get; private set; } public List Shops { get; private set; } public static DataFileSingleton GetInstance() { if (instance == null) { instance = new DataFileSingleton(); } return instance; } public void SaveComponents() => SaveData(Components, ComponentFileName, "Components", x => x.GetXElement); public void SaveFlowers() => SaveData(Flowers, FlowerFileName, "Flowers", x => x.GetXElement); public void SaveOrders() => SaveData(Orders, OrderFileName, "Orders", x => x.GetXElement); public void SaveClients() => SaveData(Clients, ClientFileName, "Clients", x => x.GetXElement); public void SaveShops() => SaveData(Shops, ShopFileName, "Shops", x => x.GetXElement); private DataFileSingleton() { Components = LoadData(ComponentFileName, "Component", x => Component.Create(x)!)!; Flowers = LoadData(FlowerFileName, "Flower", x => Flower.Create(x)!)!; Orders = LoadData(OrderFileName, "Order", x => Order.Create(x)!)!; Clients = LoadData(ClientFileName, "Client", x => Client.Create(x)!)!; Shops = LoadData(ShopFileName, "Shop", x => Shop.Create(x)!)!; } private static List? LoadData(string filename, string xmlNodeName, Func selectFunction) { if (File.Exists(filename)) { return XDocument.Load(filename)?.Root?.Elements(xmlNodeName)?.Select(selectFunction)?.ToList(); } return new List(); } private static void SaveData(List data, string filename, string xmlNodeName, Func selectFunction) { if (data != null) { new XDocument(new XElement(xmlNodeName, data.Select(selectFunction).ToArray())).Save(filename); } } } }