add RemoteState class

Author: andreaskueffel

FileSyncLibNet/Commons/RemoteState.cs

@@ -0,0 +1,87 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text.Json;
+
+namespace FileSyncLibNet.Commons
+{
+    internal class RemoteState : IDisposable
+    {
+        public Dictionary<string, FileInfo2> FileInfos { get; set; }
+        public string Filename { get; private set; }
+        private static readonly JsonSerializerOptions jsonOptions = new JsonSerializerOptions
+        {
+            WriteIndented = true
+        };
+        public RemoteState(string name)
+        {
+            Filename = $"RemoteState_{name}.json";
+            FileInfos = LoadFromFile(Filename);
+        }
+        public FileInfo2 GetFileInfo(string path)
+        {
+            if (FileInfos.ContainsKey(path))
+                return FileInfos[path];
+
+            return new FileInfo2(path, false)
+            {
+                LastWriteTime = DateTime.MinValue,
+                Length = 0
+            };
+        }
+        public void SetFileInfo(string path, FileInfo2 fileInfo)
+        {
+            if (FileInfos.ContainsKey(path))
+            {
+                FileInfos[path] = fileInfo;
+            }
+            else
+                FileInfos.Add(path, fileInfo);
+
+            SaveToFile(Filename, FileInfos);
+        }
+        public void RemoveFileInfo(string path)
+        {
+            if (FileInfos.ContainsKey(path))
+            {
+                FileInfos.Remove(path);
+            }
+            SaveToFile(Filename, FileInfos);
+        }
+        private static Dictionary<string, FileInfo2> LoadFromFile(string filename)
+        {
+            if (File.Exists(filename))
+            {
+                try
+                {
+                    var fileContent = File.ReadAllText(filename);
+                    var fileInfos = JsonSerializer.Deserialize<Dictionary<string, FileInfo2>>(fileContent);
+                    return fileInfos;
+                }
+                catch
+                {
+                    return new Dictionary<string, FileInfo2>();
+                }
+            }
+            return new Dictionary<string, FileInfo2>();
+        }
+
+        private static void SaveToFile(string filename, Dictionary<string, FileInfo2> fileInfos)
+        {
+            try
+            {
+                var fileContent = JsonSerializer.Serialize(fileInfos, jsonOptions);
+                File.WriteAllText(filename, fileContent);
+            }
+            catch
+            {
+
+            }
+        }
+
+        public void Dispose()
+        {
+            FileInfos.Clear();
+        }
+    }
+}