//
// System.Runtime.InteropServices.ExtensibleClassFactory.cs
//
// Author:
// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
// Jonathan Chambers (joncham@gmail.com)
//
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
// Copyright (C) 2006 Jonathan Chambers
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Diagnostics;
using System.Collections;
using System.Reflection;
namespace System.Runtime.InteropServices{
[ComVisible (true)]
public sealed class ExtensibleClassFactory
{
static Hashtable hashtable;
static ExtensibleClassFactory ()
{
hashtable = new Hashtable ();
}
private ExtensibleClassFactory ()
{
}
internal static ObjectCreationDelegate GetObjectCreationCallback (Type t)
{
return hashtable[t] as ObjectCreationDelegate;
}
public static void RegisterObjectCreationCallback (ObjectCreationDelegate callback) {
int i = 1;
StackTrace trace = new StackTrace (false);
while (i < trace.FrameCount) {
StackFrame frame = trace.GetFrame (i);
MethodBase m = frame.GetMethod ();
if (m.MemberType == MemberTypes.Constructor && m.IsStatic) {
hashtable.Add (m.DeclaringType, callback);
return;
}
i++;
}
throw new System.InvalidOperationException (
"RegisterObjectCreationCallback must be called from .cctor of class derived from ComImport type.");
}
}
}
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