move additional classes to new server lib

Emby.Server.Implementations/Sorting/ProductionYearComparer.cs

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