--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Source/Mapping/Fluent/FluentMapHelper.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,72 @@
+using BLToolkit.Reflection.Extension;
+
+namespace BLToolkit.Mapping.Fluent
+{
+	public static class FluentMapHelper
+	{
+		public static void MergeExtensions(ExtensionList fromExt, ref ExtensionList toExt)
+		{
+			foreach (var kv in fromExt)
+			{
+				TypeExtension toType;
+				if (toExt.TryGetValue(kv.Key, out toType))
+				{
+					MergeExtensions(kv.Value, ref toType);
+				}
+				else
+				{
+					toExt.Add(kv.Key, kv.Value);
+				}
+			}
+		}
+
+		public static void MergeExtensions(TypeExtension fromExt, ref TypeExtension toExt)
+		{
+			if (ReferenceEquals(fromExt, toExt))
+			{
+				return;
+			}
+			foreach (var attribute in fromExt.Attributes)
+			{
+				AttributeExtensionCollection attrs;
+				if (toExt.Attributes.TryGetValue(attribute.Key, out attrs))
+				{
+					MergeExtensions(attribute.Value, ref attrs);
+				}
+				else
+				{
+					toExt.Attributes.Add(attribute.Key, attribute.Value);
+				}
+			}
+			foreach (var member in fromExt.Members)
+			{
+				MemberExtension value;
+				if (toExt.Members.TryGetValue(member.Key, out value))
+				{
+					MergeExtensions(member.Value, ref value);
+				}
+				else
+				{
+					toExt.Members.Add(member.Key, member.Value);
+				}
+			}
+		}
+
+		private static void MergeExtensions(MemberExtension fromExt, ref MemberExtension toExt)
+		{
+			foreach (var attribute in fromExt.Attributes)
+			{
+				if (toExt.Attributes.ContainsKey(attribute.Key))
+				{
+					toExt.Attributes.Remove(attribute.Key);
+				}
+				toExt.Attributes.Add(attribute.Key, attribute.Value);
+			}
+		}
+
+		private static void MergeExtensions(AttributeExtensionCollection fromExt, ref AttributeExtensionCollection toExt)
+		{
+			toExt.AddRange(fromExt);
+		}
+	}
+}
\ No newline at end of file