unified the two sorting api's

MediaBrowser.Server.Implementations/Sorting/PremiereDateComparer.cs

@@ -0,0 +1,52 @@
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Sorting;
+using MediaBrowser.Model.Dto;
+using System;
+
+namespace MediaBrowser.Server.Implementations.Sorting
+{
+    /// <summary>
+    /// Class PremiereDateComparer
+    /// </summary>
+    public class PremiereDateComparer : 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 GetDate(x).CompareTo(GetDate(y));
+        }
+
+        /// <summary>
+        /// Gets the date.
+        /// </summary>
+        /// <param name="x">The x.</param>
+        /// <returns>DateTime.</returns>
+        private DateTime GetDate(BaseItem x)
+        {
+            if (x.PremiereDate.HasValue)
+            {
+                return x.PremiereDate.Value;
+            }
+            
+            if (x.ProductionYear.HasValue)
+            {
+                return new DateTime(x.ProductionYear.Value, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+            }
+            return DateTime.MaxValue;
+        }
+
+        /// <summary>
+        /// Gets the name.
+        /// </summary>
+        /// <value>The name.</value>
+        public string Name
+        {
+            get { return ItemSortBy.PremiereDate; }
+        }
+    }
+}