added item type to refresh info

MediaBrowser.Controller/Providers/DirectoryService.cs

@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using MediaBrowser.Model.Logging;
+
+namespace MediaBrowser.Controller.Providers
+{
+    public class DirectoryService
+    {
+        private readonly ILogger _logger;
+
+        private readonly Dictionary<string, List<FileSystemInfo>> _cache = new Dictionary<string, List<FileSystemInfo>>(StringComparer.OrdinalIgnoreCase);
+
+        public DirectoryService(ILogger logger)
+        {
+            _logger = logger;
+        }
+
+        public List<FileSystemInfo> GetFileSystemEntries(string path)
+        {
+            List<FileSystemInfo> entries;
+
+            if (!_cache.TryGetValue(path, out entries))
+            {
+                //_logger.Debug("Getting files for " + path);
+
+                entries = new DirectoryInfo(path).EnumerateFileSystemInfos("*", SearchOption.TopDirectoryOnly).ToList();
+                _cache.Add(path, entries);
+            }
+
+            return entries;
+        }
+
+        public IEnumerable<FileInfo> GetFiles(string path)
+        {
+            return GetFileSystemEntries(path).OfType<FileInfo>();
+        }
+
+        public IEnumerable<DirectoryInfo> GetDirectories(string path)
+        {
+            return GetFileSystemEntries(path).OfType<DirectoryInfo>();
+        }
+
+        public FileInfo GetFile(string path)
+        {
+            var directory = Path.GetDirectoryName(path);
+            var filename = Path.GetFileName(path);
+
+            return GetFiles(directory).FirstOrDefault(i => string.Equals(i.Name, filename, StringComparison.OrdinalIgnoreCase));
+        }
+
+
+        public DirectoryInfo GetDirectory(string path)
+        {
+            var directory = Path.GetDirectoryName(path);
+            var name = Path.GetFileName(path);
+
+            return GetDirectories(directory).FirstOrDefault(i => string.Equals(i.Name, name, StringComparison.OrdinalIgnoreCase));
+        }
+    }
+}