Added a mechanism for adding a custom IComponentMappingProvider implementation to a class mapping. Requested by Brandon Behrens.

Author: paulbatum

src/FluentNHibernate.Specs/FluentInterface/ClassMapSpecs/ClassMapSpecs.Component.cs

@@ -1,4 +1,7 @@
+using System;
 using System.Collections;
+using FluentNHibernate.Mapping;
+using FluentNHibernate.Mapping.Providers;
 using FluentNHibernate.MappingModel.ClassBased;
 using FluentNHibernate.Specs.FluentInterface.Fixtures;
 using Machine.Specifications;
@@ -25,6 +28,24 @@ public class when_class_map_is_told_to_map_a_component_from_a_field : ProviderSp
         protected static ClassMapping mapping;
     }
 
+    public class when_class_map_is_told_to_map_a_component_using_a_provider : ProviderSpec
+    {
+        Because of = () =>
+            mapping = map_as_class<EntityWithComponent>(m => m.Component(new ComponentMappingProviderStub()));
+
+        Behaves_like<ClasslikeComponentBehaviour> a_component_in_a_classlike;
+
+        protected static ClassMapping mapping;        
+
+        private class ComponentMappingProviderStub : IComponentMappingProvider
+        {
+            public IComponentMapping GetComponentMapping()
+            {
+                return null;
+            }
+        }
+    }
+
     public class when_class_map_is_told_to_map_a_component_using_reveal : ProviderSpec
     {
         Because of = () =>

src/FluentNHibernate/Mapping/ClasslikeMapBase.cs

@@ -278,6 +278,19 @@ protected virtual ComponentPart<TComponent> Component<TComponent>(Member propert
             return part;
         }
 
+        /// <summary>
+        /// Allows the user to add a custom component mapping to the class mapping.        
+        /// Note: not a fluent method.
+        /// </summary>
+        /// <remarks>
+        /// In some cases, our users need a way to add an instance of their own implementation of IComponentMappingProvider.
+        /// For an example of where this might be necessary, see: http://codebetter.com/blogs/jeremy.miller/archive/2010/02/16/our-extension-properties-story.aspx
+        /// </remarks>        
+        public void Component(IComponentMappingProvider componentProvider)
+        {
+            components.Add(componentProvider);
+        }
+
         private OneToManyPart<TChild> MapHasMany<TChild, TReturn>(Expression<Func<T, TReturn>> expression)
         {
             return HasMany<TChild>(expression.ToMember());