made base video resolver available for re-use

MediaBrowser.Controller/Resolvers/BaseItemResolver.cs

@@ -0,0 +1,61 @@
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Library;
+
+namespace MediaBrowser.Controller.Resolvers
+{
+    /// <summary>
+    /// Class ItemResolver
+    /// </summary>
+    /// <typeparam name="T"></typeparam>
+    public abstract class ItemResolver<T> : IItemResolver
+        where T : BaseItem, new()
+    {
+        /// <summary>
+        /// Resolves the specified args.
+        /// </summary>
+        /// <param name="args">The args.</param>
+        /// <returns>`0.</returns>
+        protected virtual T Resolve(ItemResolveArgs args)
+        {
+            return null;
+        }
+
+        /// <summary>
+        /// Gets the priority.
+        /// </summary>
+        /// <value>The priority.</value>
+        public virtual ResolverPriority Priority
+        {
+            get
+            {
+                return ResolverPriority.First;
+            }
+        }
+
+        /// <summary>
+        /// Sets initial values on the newly resolved item
+        /// </summary>
+        /// <param name="item">The item.</param>
+        /// <param name="args">The args.</param>
+        protected virtual void SetInitialItemValues(T item, ItemResolveArgs args)
+        {
+        }
+
+        /// <summary>
+        /// Resolves the path.
+        /// </summary>
+        /// <param name="args">The args.</param>
+        /// <returns>BaseItem.</returns>
+        BaseItem IItemResolver.ResolvePath(ItemResolveArgs args)
+        {
+            var item = Resolve(args);
+
+            if (item != null)
+            {
+                SetInitialItemValues(item, args);
+            }
+
+            return item;
+        }
+    }
+}