Recursive PublishedContentExtensions IsDocumentType

Optional recursive parameter defaulted to false for backwards compatibility and no performance hit.
Settings recursive = true fetches content type for content and checks ancestor content types for the same alias.

src/Umbraco.Tests/PublishedContent/PublishedContentExtensionTests.cs

@@ -0,0 +1,110 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using NUnit.Framework;
+using Umbraco.Core.Models;
+using Umbraco.Tests.TestHelpers;
+using Umbraco.Web;
+
+namespace Umbraco.Tests.PublishedContent
+{
+	[TestFixture]
+	public class PublishedContentExtensionTests : PublishedContentTestBase
+	{
+		private UmbracoContext ctx;
+		private string xmlContent = "";
+		private bool createContentTypes = true;
+
+		protected override DatabaseBehavior DatabaseTestBehavior
+		{
+			get { return DatabaseBehavior.NewDbFileAndSchemaPerFixture; }
+		}
+
+		[SetUp]
+		public override void Initialize()
+		{
+			base.Initialize();
+		}
+
+		[TearDown]
+		public override void TearDown()
+		{
+			base.TearDown();
+		}
+
+		protected override string GetXmlContent(int templateId)
+		{
+			return xmlContent;
+		}
+
+		[Test]
+		public void IsDocumentType_NonRecursive_ActualType_ReturnsTrue()
+		{
+			InitializeInheritedContentTypes();
+
+			var publishedContent = ctx.ContentCache.GetById(1100);
+			Assert.That(publishedContent.IsDocumentType("inherited"));
+		}
+
+		[Test]
+		public void IsDocumentType_NonRecursive_BaseType_ReturnsFalse()
+		{
+			InitializeInheritedContentTypes();
+
+			var publishedContent = ctx.ContentCache.GetById(1100);
+			Assert.That(publishedContent.IsDocumentType("base"), Is.False);
+		}
+
+		[Test]
+		public void IsDocumentType_Recursive_ActualType_ReturnsTrue()
+		{
+			InitializeInheritedContentTypes();
+
+			var publishedContent = ctx.ContentCache.GetById(1100);
+			Assert.That(publishedContent.IsDocumentType("inherited", true));
+		}
+
+		[Test]
+		public void IsDocumentType_Recursive_BaseType_ReturnsTrue()
+		{
+			InitializeInheritedContentTypes();
+
+			var publishedContent = ctx.ContentCache.GetById(1100);
+			Assert.That(publishedContent.IsDocumentType("base", true));
+		}
+
+		[Test]
+		public void IsDocumentType_Recursive_InvalidBaseType_ReturnsFalse()
+		{
+			InitializeInheritedContentTypes();
+
+			var publishedContent = ctx.ContentCache.GetById(1100);
+			Assert.That(publishedContent.IsDocumentType("invalidbase", true), Is.False);
+		}
+
+		private void InitializeInheritedContentTypes()
+		{
+			ctx = GetUmbracoContext("/", 1, null, true);
+			if (createContentTypes)
+			{
+				var contentTypeService = ctx.Application.Services.ContentTypeService;
+				var baseType = new ContentType(-1) {Alias = "base", Name = "Base"};
+				var inheritedType = new ContentType(baseType) {Alias = "inherited", Name = "Inherited"};
+				contentTypeService.Save(baseType);
+				contentTypeService.Save(inheritedType);
+				createContentTypes = false;
+			}
+			#region setup xml content
+			xmlContent = @"<?xml version=""1.0"" encoding=""utf-8""?>
+<!DOCTYPE root[ 
+<!ELEMENT inherited ANY>
+<!ATTLIST inherited id ID #REQUIRED>
+]>
+<root id=""-1"">
+	<inherited id=""1100"" parentID=""-1"" level=""1"" writerID=""0"" creatorID=""0"" nodeType=""1044"" template=""1"" sortOrder=""1"" createDate=""2012-06-12T14:13:17"" updateDate=""2012-07-20T18:50:43"" nodeName=""Home"" urlName=""home"" writerName=""admin"" creatorName=""admin"" path=""-1,1046"" isDoc=""""/>
+</root>";
+			#endregion
+		}
+	}
+}

src/Umbraco.Tests/Umbraco.Tests.csproj

@@ -196,6 +196,7 @@
     <Compile Include="Persistence\Repositories\MemberTypeRepositoryTest.cs" />
     <Compile Include="Persistence\Repositories\UserRepositoryTest.cs" />
     <Compile Include="Persistence\Repositories\UserTypeRepositoryTest.cs" />
+    <Compile Include="PublishedContent\PublishedContentExtensionTests.cs" />
     <Compile Include="PublishedContent\StronglyTypedModels\CallingMethodTests.cs" />
     <Compile Include="PublishedContent\StronglyTypedModels\Subpage.cs" />
     <Compile Include="PublishedContent\StronglyTypedModels\Textpage.cs" />

src/Umbraco.Web/PublishedContentExtensions.cs

@@ -537,9 +537,27 @@ namespace Umbraco.Web
 
 		#region Is Helpers
 
-		public static bool IsDocumentType(this IPublishedContent content, string docTypeAlias)
+		public static bool IsDocumentType(this IPublishedContent content, string docTypeAlias, bool recursive = false)
 		{
-			return content.DocumentTypeAlias == docTypeAlias;
+			if (content.DocumentTypeAlias == docTypeAlias)
+				return true;
+
+			if (recursive)
+				return IsDocumentTypeRecursive(content, docTypeAlias);
+			return false;
+		}
+
+		private static bool IsDocumentTypeRecursive(IPublishedContent content, string docTypeAlias)
+		{
+			var contentTypeService = UmbracoContext.Current.Application.Services.ContentTypeService;
+			var type = contentTypeService.GetContentType(content.DocumentTypeAlias);
+			while (type.ParentId > 0)
+			{
+				type = contentTypeService.GetContentType(type.ParentId);
+				if (type.Alias == docTypeAlias)
+					return true;
+			}
+			return false;
 		}
 
 		public static bool IsNull(this IPublishedContent content, string alias, bool recursive)