Renamed the project to Umbraco.PublishedCache.NuCache - and move non NuCache related stuff to abstractions and infrastructure.

src/Umbraco.PublishedCache.NuCache/Navigable/RootContent.cs

@@ -0,0 +1,38 @@
+using System.Collections.Generic;
+using System.Linq;
+using Umbraco.Core.Xml.XPath;
+
+namespace Umbraco.Web.PublishedCache.NuCache.Navigable
+{
+    internal class RootContent : INavigableContent
+    {
+        private static readonly RootContentType ContentType = new RootContentType();
+        private readonly int[] _childIds;
+
+        public RootContent(IEnumerable<int> childIds)
+        {
+            _childIds = childIds.ToArray();
+        }
+
+        public int Id => -1;
+
+        public int ParentId => -1;
+
+        public INavigableContentType Type => ContentType;
+
+        public IList<int> ChildIds => _childIds;
+
+        public object Value(int index)
+        {
+            // only id has a value
+            return index == 0 ? "-1" : null;
+        }
+
+        private class RootContentType : INavigableContentType
+        {
+            public string Name => "root";
+
+            public INavigableFieldType[] FieldTypes => NavigableContentType.BuiltinProperties;
+        }
+    }
+}