Refactor more mappers

src/Umbraco.Core/Mapping/MapperContext.cs

@@ -0,0 +1,35 @@
+using System.Collections.Generic;
+
+namespace Umbraco.Core.Mapping
+{
+    /// <summary>
+    /// Represents a mapper context.
+    /// </summary>
+    public class MapperContext
+    {
+        private IDictionary<string, object> _items;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="MapperContext"/> class.
+        /// </summary>
+        public MapperContext(Mapper mapper)
+        {
+            Mapper = mapper;
+        }
+
+        /// <summary>
+        /// Gets the mapper.
+        /// </summary>
+        public Mapper Mapper { get;}
+
+        /// <summary>
+        /// Gets a value indicating whether the context has items.
+        /// </summary>
+        public bool HasItems => _items != null;
+
+        /// <summary>
+        /// Gets the context items.
+        /// </summary>
+        public IDictionary<string, object> Items => _items ?? (_items = new Dictionary<string, object>());
+    }
+}