fixes #795 - Support reading Xbmc nfo's

MediaBrowser.LocalMetadata/Parsers/GameSystemXmlParser.cs

@@ -0,0 +1,64 @@
+using System.Threading;
+using System.Threading.Tasks;
+using System.Xml;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Providers;
+using MediaBrowser.Model.Entities;
+using MediaBrowser.Model.Logging;
+
+namespace MediaBrowser.LocalMetadata.Parsers
+{
+    public class GameSystemXmlParser : BaseItemXmlParser<GameSystem>
+    {
+        public GameSystemXmlParser(ILogger logger)
+            : base(logger)
+        {
+        }
+
+        private readonly Task _cachedTask = Task.FromResult(true);
+        public Task FetchAsync(GameSystem item, string metadataFile, CancellationToken cancellationToken)
+        {
+            Fetch(item, metadataFile, cancellationToken);
+
+            cancellationToken.ThrowIfCancellationRequested();
+
+            return _cachedTask;
+        }
+
+        /// <summary>
+        /// Fetches the data from XML node.
+        /// </summary>
+        /// <param name="reader">The reader.</param>
+        /// <param name="item">The item.</param>
+        protected override void FetchDataFromXmlNode(XmlReader reader, GameSystem item)
+        {
+            switch (reader.Name)
+            {
+                case "GameSystem":
+                    {
+                        var val = reader.ReadElementContentAsString();
+                        if (!string.IsNullOrWhiteSpace(val))
+                        {
+                            item.GameSystemName = val;
+                        }
+                        break;
+                    }
+
+                case "GamesDbId":
+                    {
+                        var val = reader.ReadElementContentAsString();
+                        if (!string.IsNullOrWhiteSpace(val))
+                        {
+                            item.SetProviderId(MetadataProviders.Gamesdb, val);
+                        }
+                        break;
+                    }
+
+
+                default:
+                    base.FetchDataFromXmlNode(reader, item);
+                    break;
+            }
+        }
+    }
+}