add column sorting to reports

MediaBrowser.Server.Implementations/Sorting/GameSystemComparer.cs

@@ -0,0 +1,54 @@
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Sorting;
+using MediaBrowser.Model.Querying;
+using System;
+
+namespace MediaBrowser.Server.Implementations.Sorting
+{
+    public class GameSystemComparer : IBaseItemComparer
+    {
+        /// <summary>
+        /// Compares the specified x.
+        /// </summary>
+        /// <param name="x">The x.</param>
+        /// <param name="y">The y.</param>
+        /// <returns>System.Int32.</returns>
+        public int Compare(BaseItem x, BaseItem y)
+        {
+            return string.Compare(GetValue(x), GetValue(y), StringComparison.CurrentCultureIgnoreCase);
+        }
+
+        /// <summary>
+        /// Gets the value.
+        /// </summary>
+        /// <param name="x">The x.</param>
+        /// <returns>System.String.</returns>
+        private string GetValue(BaseItem x)
+        {
+            var game = x as Game;
+
+            if (game != null)
+            {
+                return game.GameSystem;
+            }
+
+            var system = x as GameSystem;
+
+            if (system != null)
+            {
+                return system.GameSystemName;
+            }
+
+            return string.Empty;
+        }
+
+        /// <summary>
+        /// Gets the name.
+        /// </summary>
+        /// <value>The name.</value>
+        public string Name
+        {
+            get { return ItemSortBy.GameSystem; }
+        }
+    }
+}