Add GPL modules

MediaBrowser.Controller/Entities/Extensions.cs

@@ -0,0 +1,46 @@
+using MediaBrowser.Model.Entities;
+using System;
+using System.Linq;
+using MediaBrowser.Model.Extensions;
+
+namespace MediaBrowser.Controller.Entities
+{
+    /// <summary>
+    /// Class Extensions
+    /// </summary>
+    public static class Extensions
+    {
+        /// <summary>
+        /// Adds the trailer URL.
+        /// </summary>
+        public static void AddTrailerUrl(this BaseItem item, string url)
+        {
+            if (string.IsNullOrEmpty(url))
+            {
+                throw new ArgumentNullException("url");
+            }
+
+            var current = item.RemoteTrailers.FirstOrDefault(i => string.Equals(i.Url, url, StringComparison.OrdinalIgnoreCase));
+
+            if (current == null)
+            {
+                var mediaUrl = new MediaUrl
+                {
+                    Url = url
+                };
+
+                if (item.RemoteTrailers.Length == 0)
+                {
+                    item.RemoteTrailers = new[] { mediaUrl };
+                }
+                else
+                {
+                    var list = item.RemoteTrailers.ToArray(item.RemoteTrailers.Length + 1);
+                    list[list.Length - 1] = mediaUrl;
+
+                    item.RemoteTrailers = list;
+                }
+            }
+        }
+    }
+}