fixes #530 - Add ability to sort movie genres/studios/people by movie or trailer count

MediaBrowser.Server.Implementations/Sorting/EpisodeCountComparer.cs

@@ -0,0 +1,76 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Library;
+using MediaBrowser.Controller.Persistence;
+using MediaBrowser.Controller.Sorting;
+using MediaBrowser.Model.Querying;
+
+namespace MediaBrowser.Server.Implementations.Sorting
+{
+    class EpisodeCountComparer : IUserBaseItemComparer
+    {
+        /// <summary>
+        /// Gets or sets the user.
+        /// </summary>
+        /// <value>The user.</value>
+        public User User { get; set; }
+
+        /// <summary>
+        /// Gets or sets the user manager.
+        /// </summary>
+        /// <value>The user manager.</value>
+        public IUserManager UserManager { get; set; }
+
+        /// <summary>
+        /// Gets or sets the user data repository.
+        /// </summary>
+        /// <value>The user data repository.</value>
+        public IUserDataRepository UserDataRepository { get; set; }
+
+        /// <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 GetValue(x).CompareTo(GetValue(y));
+        }
+
+        /// <summary>
+        /// Gets the date.
+        /// </summary>
+        /// <param name="x">The x.</param>
+        /// <returns>DateTime.</returns>
+        private int GetValue(BaseItem x)
+        {
+            var itemByName = x as IItemByName;
+
+            if (itemByName != null)
+            {
+                var counts = itemByName.GetItemByNameCounts(User);
+
+                if (counts != null)
+                {
+                    return counts.EpisodeCount;
+                }
+            }
+
+            return 0;
+        }
+
+        /// <summary>
+        /// Gets the name.
+        /// </summary>
+        /// <value>The name.</value>
+        public string Name
+        {
+            get { return ItemSortBy.EpisodeCount; }
+        }
+    }
+}