From 2dc705d335deaccb0cd90f676561c312946120fa Mon Sep 17 00:00:00 2001
From: Chris Cameron <chris.cameron@wedoresi.com>
Date: Mon, 4 Feb 2019 11:38:39 -0500
Subject: [PATCH] perf: Significantly reducing the size of JSON serialized
 types

---
 .../Extensions/JsonWriterExtensions.cs        | 88 +++++++++++++++++--
 1 file changed, 83 insertions(+), 5 deletions(-)

diff --git a/ICD.Common.Utils/Extensions/JsonWriterExtensions.cs b/ICD.Common.Utils/Extensions/JsonWriterExtensions.cs
index 98b4fe8..acfb591 100644
--- a/ICD.Common.Utils/Extensions/JsonWriterExtensions.cs
+++ b/ICD.Common.Utils/Extensions/JsonWriterExtensions.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Text;
 using ICD.Common.Properties;
 using Newtonsoft.Json;
 
@@ -7,6 +8,16 @@ namespace ICD.Common.Utils.Extensions
 {
 	public static class JsonWriterExtensions
 	{
+		private static readonly Dictionary<Type, string> s_TypeToName;
+
+		/// <summary>
+		/// Static constructor.
+		/// </summary>
+		static JsonWriterExtensions()
+		{
+			s_TypeToName = new Dictionary<Type, string>();
+		}
+
 		/// <summary>
 		/// Writes the type value.
 		/// </summary>
@@ -24,11 +35,7 @@ namespace ICD.Common.Utils.Extensions
 				return;
 			}
 
-			// Find the smallest possible name representation for the type that will still resolve
-			string name = Type.GetType(type.FullName) == null
-							  ? type.AssemblyQualifiedName
-							  : type.FullName;
-
+			string name = GetTypeName(type);
 			extends.WriteValue(name);
 		}
 
@@ -83,5 +90,76 @@ namespace ICD.Common.Utils.Extensions
 			}
 			writer.WriteEndArray();
 		}
+
+		/// <summary>
+		/// Gets the string representation foe the given type.
+		/// </summary>
+		/// <param name="type"></param>
+		/// <returns></returns>
+		private static string GetTypeName(Type type)
+		{
+			if (type == null)
+				throw new ArgumentNullException("type");
+
+			string name;
+			if (!s_TypeToName.TryGetValue(type, out name))
+			{
+				name = RemoveAssemblyDetails(type.AssemblyQualifiedName);
+				s_TypeToName.Add(type, name);
+			}
+
+			return name;
+		}
+
+		/// <summary>
+		/// Taken from Newtonsoft.Json.Utilities.ReflectionUtils
+		/// Removes the assembly details from a type assembly qualified name.
+		/// </summary>
+		/// <param name="fullyQualifiedTypeName"></param>
+		/// <returns></returns>
+		private static string RemoveAssemblyDetails(string fullyQualifiedTypeName)
+		{
+			StringBuilder builder = new StringBuilder();
+
+			// loop through the type name and filter out qualified assembly details from nested type names
+			bool writingAssemblyName = false;
+			bool skippingAssemblyDetails = false;
+			for (int i = 0; i < fullyQualifiedTypeName.Length; i++)
+			{
+				char current = fullyQualifiedTypeName[i];
+				switch (current)
+				{
+					case '[':
+						writingAssemblyName = false;
+						skippingAssemblyDetails = false;
+						builder.Append(current);
+						break;
+					case ']':
+						writingAssemblyName = false;
+						skippingAssemblyDetails = false;
+						builder.Append(current);
+						break;
+					case ',':
+						if (!writingAssemblyName)
+						{
+							writingAssemblyName = true;
+							builder.Append(current);
+						}
+						else
+						{
+							skippingAssemblyDetails = true;
+						}
+						break;
+					default:
+						if (!skippingAssemblyDetails)
+						{
+							builder.Append(current);
+						}
+						break;
+				}
+			}
+
+			return builder.ToString();
+		}
 	}
 }