Remove generic builder pattern from element metadata creation (Part 1)

Directory.Packages.props

@@ -4,6 +4,7 @@
     <PackageVersion Include="BenchmarkDotNet" Version="0.14.0" />
     <PackageVersion Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.14.0" />
     <PackageVersion Include="coverlet.collector" Version="6.0.4" />
+    <PackageVersion Include="Microsoft.Bcl.Memory" Version="9.0.0" />
     <PackageVersion Include="Microsoft.DotNet.BuildTools.GenAPI" Version="3.0.0-preview4-06015-01" />
     <PackageVersion Include="Microsoft.CodeAnalysis" Version="4.11.0" />
     <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.8.0" />

gen/DocumentFormat.OpenXml.Generator.Models/Editor/TextWriterExtensions.cs

@@ -128,6 +128,10 @@ public static void WriteItem<T>(this TextWriter writer, T item, bool isConstant
         {
             writer.WriteString(item.ToString());
         }
+        else if (typeof(T) == typeof(TypedQName))
+        {
+            writer.WriteString(item.ToString());
+        }
         else if (typeof(T) == typeof(string))
         {
             writer.WriteString((string)(object)item, isConstant);

gen/DocumentFormat.OpenXml.Generator.Models/Generators/Elements/DataModelWriterExtensions.cs

@@ -5,7 +5,9 @@
 using DocumentFormat.OpenXml.Generator.Models;
 using DocumentFormat.OpenXml.Generator.Schematron;
 using System.CodeDom.Compiler;
+using System.Runtime.CompilerServices;
 using System.Text;
+using System.Xml.Linq;
 
 namespace DocumentFormat.OpenXml.Generator.Generators.Elements;
 
@@ -169,6 +171,22 @@ private static string GetBaseName(SchemaType type)
         return type.BaseClass;
     }
 
+    private static void WriteTypeDetails(this IndentedTextWriter writer, OpenXmlGeneratorServices services, SchemaType element)
+    {
+        // Since some types will not be shadowing an existing static type, it's easier to just disable the warning
+        writer.WriteLine("#pragma warning disable CS0109");
+        writer.Write("internal static readonly new OpenXmlQualifiedName ElementQName = ");
+        writer.WriteQName(services, element.Name.QName);
+        writer.WriteLine(";");
+
+        writer.Write("internal static readonly new OpenXmlQualifiedName ElementTypeName = ");
+        writer.WriteQName(services, element.Name.Type);
+        writer.WriteLine(";");
+
+        writer.WriteLine("internal static readonly new OpenXmlSchemaType ElementType = new(ElementQName, ElementTypeName);");
+        writer.WriteLine("#pragma warning restore CS0109");
+    }
+
     private static void WriteType(this IndentedTextWriter writer, OpenXmlGeneratorServices services, SchemaType element)
     {
         writer.WriteDocumentationComment(BuildTypeComments(services, element));
@@ -205,6 +223,10 @@ private static void WriteType(this IndentedTextWriter writer, OpenXmlGeneratorSe
             var delimiter = writer.TrackDelimiter(separator: string.Empty, newLineCount: 2);
 
             delimiter.AddDelimiter();
+
+            writer.WriteTypeDetails(services, element);
+            writer.WriteLineNoTabs();
+
             writer.WriteDocumentationComment($"Initializes a new instance of the {className} class.");
             writer.Write(element.GetAccessibility());
             writer.Write(" ");
@@ -324,9 +346,7 @@ private static void WriteMetadata(this IndentedTextWriter writer, OpenXmlGenerat
 
             if (!containingType.Name.QName.IsEmpty)
             {
-                writer.Write("builder.SetSchema(");
-                writer.WriteItem(containingType.Name.QName);
-                writer.WriteLine(");");
+                writer.WriteLine("builder.SetSchema(ElementType);");
             }
 
             if (!containingType.IsAbstract && containingType.Version > OfficeVersion.Office2007)
@@ -472,14 +492,36 @@ private static void WriteElement(this IndentedTextWriter writer, OpenXmlGenerato
 
         using (writer.AddBlock(new() { IncludeTrailingNewline = false }))
         {
-            writer.Write("get => GetElement<");
+            writer.Write("get => GetElement(");
             writer.Write(className);
-            writer.WriteLine(">();");
+            writer.Write(".ElementType) as ");
+            writer.Write(className);
+            writer.WriteLine(";");
 
-            writer.WriteLine("set => SetElement(value);");
+            writer.Write("set => SetElement(value, ");
+            writer.Write(className);
+            writer.WriteLine(".ElementType);");
         }
     }
 
+    private static void WriteQName(this IndentedTextWriter writer, OpenXmlGeneratorServices services, QName qname)
+    {
+        writer.Write("new(");
+        writer.WriteString(services.GetNamespaceInfo(qname.Prefix).Uri);
+        writer.Write(", ");
+        writer.WriteString(qname.Name);
+        writer.Write(")");
+    }
+
+    internal static void WriteTypedName(this IndentedTextWriter writer, OpenXmlGeneratorServices services, TypedQName typed)
+    {
+        writer.Write("new(");
+        writer.WriteQName(services, typed.Type);
+        writer.Write(", ");
+        writer.WriteQName(services, typed.QName);
+        writer.Write(")");
+    }
+
     private static void WriteAttributeProperty(this IndentedTextWriter writer, OpenXmlGeneratorServices services, SchemaAttribute attribute, List<string>? attributeStrings = null)
     {
         var remarks = default(string);

gen/DocumentFormat.OpenXml.Generator.Models/Generators/Elements/ParticleWriterExtensions.cs

@@ -96,7 +96,11 @@ private static void WriteItemNode(this IndentedTextWriter writer, OpenXmlGenerat
         if (particle.Kind == ParticleType.Element)
         {
             var info = services.FindClassName(particle.Name);
-            writer.WriteObject("ElementParticle", particle, w => w.WriteItem(new TypeOf(info)));
+            writer.WriteObject("ElementParticle", particle, w =>
+            {
+                w.Write(info);
+                w.Write(".ElementType");
+            });
         }
         else if (particle.Kind == ParticleType.Any)
         {