Facade cleanup and refactoring

src/Umbraco.Core/Models/PublishedContent/PublishedModelAttribute.cs

@@ -0,0 +1,31 @@
+using System;
+using Umbraco.Core.Exceptions;
+
+namespace Umbraco.Core.Models.PublishedContent
+{
+    /// <inheritdoc />
+    /// <summary>
+    /// Indicates that the class is a published content model for a specified content type.
+    /// </summary>
+    /// <remarks>By default, the name of the class is assumed to be the content type alias. The
+    /// <c>PublishedContentModelAttribute</c> can be used to indicate a different alias.</remarks>
+    [AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
+    public sealed class PublishedContentModelAttribute : Attribute
+    {
+        /// <inheritdoc />
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PublishedContentModelAttribute" /> class with a content type alias.
+        /// </summary>
+        /// <param name="contentTypeAlias">The content type alias.</param>
+        public PublishedContentModelAttribute(string contentTypeAlias)
+        {
+            if (string.IsNullOrWhiteSpace(contentTypeAlias)) throw new ArgumentNullOrEmptyException(nameof(contentTypeAlias));
+            ContentTypeAlias = contentTypeAlias;
+        }
+
+        /// <summary>
+        /// Gets or sets the content type alias.
+        /// </summary>
+        public string ContentTypeAlias { get; }
+    }
+}