From b48ef586ac22682cfe68f26311500b02c2846a0f Mon Sep 17 00:00:00 2001
From: Joseph Doherty <dohertj2@Josephs-MacBook-Pro.local>
Date: Tue, 6 Jan 2026 23:23:57 -0500
Subject: [PATCH] feat(ExcelIO): add ExcelMapRegistry for DI integration

---
 .../Mapping/ExcelMapRegistry.cs               | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 NEW/src/JdeScoping.ExcelIO/Mapping/ExcelMapRegistry.cs

diff --git a/NEW/src/JdeScoping.ExcelIO/Mapping/ExcelMapRegistry.cs b/NEW/src/JdeScoping.ExcelIO/Mapping/ExcelMapRegistry.cs
new file mode 100644
index 0000000..c5e96b8
--- /dev/null
+++ b/NEW/src/JdeScoping.ExcelIO/Mapping/ExcelMapRegistry.cs
@@ -0,0 +1,45 @@
+namespace JdeScoping.ExcelIO.Mapping;
+
+/// <summary>
+/// Registry for Excel class maps, used for DI and lookup.
+/// </summary>
+public sealed class ExcelMapRegistry
+{
+    private readonly Dictionary<Type, IExcelClassMap> _maps = new();
+
+    /// <summary>
+    /// Registers a map for a type.
+    /// </summary>
+    public void Register<T>(ExcelClassMap<T> map)
+    {
+        _maps[typeof(T)] = map;
+    }
+
+    /// <summary>
+    /// Gets the map for a type.
+    /// </summary>
+    public IExcelClassMap GetMap<T>() => GetMap(typeof(T));
+
+    /// <summary>
+    /// Gets the map for a type.
+    /// </summary>
+    public IExcelClassMap GetMap(Type type)
+    {
+        if (_maps.TryGetValue(type, out var map))
+            return map;
+
+        throw new InvalidOperationException(
+            $"No Excel map registered for type {type.Name}. " +
+            $"Register a map using ExcelMapRegistry.Register().");
+    }
+
+    /// <summary>
+    /// Checks if a map exists for a type.
+    /// </summary>
+    public bool HasMap<T>() => HasMap(typeof(T));
+
+    /// <summary>
+    /// Checks if a map exists for a type.
+    /// </summary>
+    public bool HasMap(Type type) => _maps.ContainsKey(type);
+}