Moved PublishedCache from Umbraco.Web into .Net standard project.

Returned to compiling state with a number of things to check and some temporarily commented out functionality.

src/Umbraco.Infrastructure.PublishedCache/PublishedCacheBase.cs

@@ -0,0 +1,107 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Xml.XPath;
+using Umbraco.Core;
+using Umbraco.Core.Models.PublishedContent;
+using Umbraco.Core.Xml;
+
+namespace Umbraco.Web.PublishedCache
+{
+    abstract class PublishedCacheBase : IPublishedCache
+    {
+        public bool PreviewDefault { get; }
+
+        protected PublishedCacheBase(bool previewDefault)
+        {
+            PreviewDefault = previewDefault;
+        }
+
+        public abstract IPublishedContent GetById(bool preview, int contentId);
+
+        public IPublishedContent GetById(int contentId)
+            => GetById(PreviewDefault, contentId);
+
+        public abstract IPublishedContent GetById(bool preview, Guid contentId);
+
+        public IPublishedContent GetById(Guid contentId)
+            => GetById(PreviewDefault, contentId);
+
+        public abstract IPublishedContent GetById(bool preview, Udi contentId);
+
+        public IPublishedContent GetById(Udi contentId)
+            => GetById(PreviewDefault, contentId);
+
+        public abstract bool HasById(bool preview, int contentId);
+
+        public bool HasById(int contentId)
+            => HasById(PreviewDefault, contentId);
+
+        public abstract IEnumerable<IPublishedContent> GetAtRoot(bool preview, string culture = null);
+
+        public IEnumerable<IPublishedContent> GetAtRoot(string culture = null)
+        {
+            return GetAtRoot(PreviewDefault, culture);
+        }
+
+        public abstract IPublishedContent GetSingleByXPath(bool preview, string xpath, XPathVariable[] vars);
+
+        public IPublishedContent GetSingleByXPath(string xpath, XPathVariable[] vars)
+        {
+            return GetSingleByXPath(PreviewDefault, xpath, vars);
+        }
+
+        public abstract IPublishedContent GetSingleByXPath(bool preview, XPathExpression xpath, XPathVariable[] vars);
+
+        public IPublishedContent GetSingleByXPath(XPathExpression xpath, XPathVariable[] vars)
+        {
+            return GetSingleByXPath(PreviewDefault, xpath, vars);
+        }
+
+        public abstract IEnumerable<IPublishedContent> GetByXPath(bool preview, string xpath, XPathVariable[] vars);
+
+        public IEnumerable<IPublishedContent> GetByXPath(string xpath, XPathVariable[] vars)
+        {
+            return GetByXPath(PreviewDefault, xpath, vars);
+        }
+
+        public abstract IEnumerable<IPublishedContent> GetByXPath(bool preview, XPathExpression xpath, XPathVariable[] vars);
+
+        public IEnumerable<IPublishedContent> GetByXPath(XPathExpression xpath, XPathVariable[] vars)
+        {
+            return GetByXPath(PreviewDefault, xpath, vars);
+        }
+
+        public abstract XPathNavigator CreateNavigator(bool preview);
+
+        public XPathNavigator CreateNavigator()
+        {
+            return CreateNavigator(PreviewDefault);
+        }
+
+        public abstract XPathNavigator CreateNodeNavigator(int id, bool preview);
+
+        public abstract bool HasContent(bool preview);
+
+        public bool HasContent()
+        {
+            return HasContent(PreviewDefault);
+        }
+
+        public abstract IPublishedContentType GetContentType(int id);
+
+        public abstract IPublishedContentType GetContentType(string alias);
+
+        public virtual IEnumerable<IPublishedContent> GetByContentType(IPublishedContentType contentType)
+        {
+            // TODO: move this extension method and get working again.
+
+            // this is probably not super-efficient, but works
+            // some cache implementation may want to override it, though
+            return Enumerable.Empty<IPublishedContent>();
+            //return GetAtRoot()
+            //    .SelectMany(x => x.DescendantsOrSelf())
+            //    .Where(x => x.ContentType.Id == contentType.Id);
+        }
+    }
+}