--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Source/Aspects/Builders/NotNullAspectBuilder.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,72 @@
+using System;
+using System.Reflection;
+using System.Reflection.Emit;
+
+using BLToolkit.Reflection.Emit;
+using BLToolkit.TypeBuilder.Builders;
+
+namespace BLToolkit.Aspects.Builders
+{
+	public class NotNullAspectBuilder : AbstractTypeBuilderBase
+	{
+		public NotNullAspectBuilder(string message)
+		{
+			_message = message;
+		}
+
+		private readonly string _message;
+
+		public override int GetPriority(BuildContext context)
+		{
+			return TypeBuilderConsts.Priority.NotNullAspect;
+		}
+
+		public override bool IsApplied(BuildContext context, AbstractTypeBuilderList builders)
+		{
+			if (context == null) throw new ArgumentNullException("context");
+
+			return context.IsBeforeStep && context.BuildElement != BuildElement.Type;
+		}
+
+		public override void Build(BuildContext context)
+		{
+			if (context == null) throw new ArgumentNullException("context");
+
+			ParameterInfo pi = (ParameterInfo)TargetElement;
+
+			if (pi.ParameterType.IsValueType == false)
+			{
+				EmitHelper emit  = context.MethodBuilder.Emitter;
+				Label      label = emit.DefineLabel();
+
+				string message = _message != null? string.Format(_message, pi.Name): string.Empty;
+
+				emit
+					.ldarg    (pi)
+					.brtrue_s (label)
+					;
+
+				if (string.IsNullOrEmpty(message))
+				{
+					emit
+						.ldstr  (pi.Name)
+						.newobj (typeof(ArgumentNullException), typeof(string))
+						;
+				}
+				else
+				{
+					emit
+						.ldnull
+						.ldstr  (message)
+						.newobj (typeof(ArgumentNullException), typeof(string), typeof(string))
+						;
+				}
+
+				emit
+					.@throw
+					.MarkLabel (label)
+					;
+			}
+		}
+	}
+}