Provide a means of locating the VBE for use along COM classes which are not managed by a IoC container.

Author: bclothier

Rubberduck.Main/Extension.cs

@@ -59,6 +59,7 @@ public void OnConnection(object Application, ext_ConnectMode ConnectMode, object
                 _addin = RootComWrapperFactory.GetAddInWrapper(AddInInst);
                 _addin.Object = this;
 
+                VbeProvider.Initialize(_vbe);
                 VBENativeServices.HookEvents(_vbe);
 
 #if DEBUG
@@ -242,6 +243,7 @@ private void ShutdownAddIn()
                 _logger.Log(LogLevel.Info, "Rubberduck is shutting down.");
                 _logger.Log(LogLevel.Trace, "Unhooking VBENativeServices events...");
                 VBENativeServices.UnhookEvents();
+                VbeProvider.Terminate();
 
                 _logger.Log(LogLevel.Trace, "Releasing dockable hosts...");
 

Rubberduck.Main/VbeProvider.cs

@@ -0,0 +1,35 @@
+using Rubberduck.VBEditor.SafeComWrappers.Abstract;
+using Rubberduck.VBEditor.VBERuntime;
+
+namespace Rubberduck
+{
+    /// <summary>
+    /// ANTI-PATTERN: Service locator for COM class. Think carefully before using it, and regret it.
+    /// </summary>
+    /// <remarks>
+    /// This is a hacky workaround to provide support to COM-visible classes without breaking the
+    /// interface or violating the security settings of the Office host. Because a COM class must
+    /// have a parameterless constructor if it is to be newed up and because COM class cannot come
+    /// from the IoC container nor have any dependencies coming out of it, we use the service
+    /// locator anti-pattern here to provide the necessary functionality for the COM classes'
+    /// internal implementations. The use should never expand beyond that limited scope. 
+    /// </remarks>
+    internal static class VbeProvider
+    {
+        internal static void Initialize(IVBE vbe)
+        {
+            Vbe = vbe;
+            VbeRuntime = new VBERuntimeAccessor(vbe);
+        }
+
+        internal static void Terminate()
+        {
+            Vbe.Dispose();
+            Vbe = null;
+            VbeRuntime = null;
+        }
+
+        internal static IVBE Vbe { get; private set; }
+        internal static IVBERuntime VbeRuntime { get; private set; }
+    }
+}