Core.Strings - refactor + new IShortStringHelper

src/Umbraco.Core/Strings/ShortStringHelperResolver.cs

@@ -0,0 +1,40 @@
+using Umbraco.Core.ObjectResolution;
+
+namespace Umbraco.Core.Strings
+{
+	/// <summary>
+    /// Resolves the IShortStringHelper object
+	/// </summary>
+    internal sealed class ShortStringHelperResolver : SingleObjectResolverBase<ShortStringHelperResolver, IShortStringHelper>
+	{
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ShortStringHelperResolver"/> class with an instance of a helper.
+        /// </summary>
+        /// <param name="helper">A instance of a helper.</param>
+        /// <remarks>The resolver is created by the <c>CoreBootManager</c> and thus the constructor remains internal.</remarks>
+        internal ShortStringHelperResolver(IShortStringHelper helper)
+            : base(helper)
+        {
+            Resolution.Frozen += (sender, args) => helper.Freeze();
+        }
+        
+        /// <summary>
+		/// Sets the helper.
+		/// </summary>
+        /// <param name="helper">The helper.</param>
+		/// <remarks>For developers, at application startup.</remarks>
+        public void SetHelper(IShortStringHelper helper)
+		{
+            Value = helper;
+		}
+
+		/// <summary>
+		/// Gets the helper.
+		/// </summary>
+        public IShortStringHelper Helper
+		{
+			get { return Value; }
+		}
+
+	}
+}