Minor

Stockholm.Syndrom/Controllers/Param.cs

@@ -1,6 +1,9 @@
+using System;
 using System.Collections.Generic;
 using System.Dynamic;
 using System.Linq;
+using Raven.Client.Listeners;
+using Raven.Json.Linq;
 
 namespace Stockholm.Syndrom.Controllers
 {
@@ -42,4 +45,36 @@ public override IEnumerable<string> GetDynamicMemberNames()
 			return GetType().GetProperties().Select(x => x.Name).Concat(vals.Keys);
 		}
 	}
-}
+
+	public class ValidationListener : IDocumentStoreListener
+	{
+		readonly Dictionary<Type, List<Action<object>>> validations = new Dictionary<Type, List<Action<object>>>();
+
+		public void Register<T>(Action<T> validate)
+		{
+			List<Action<object>> list;
+			if(validations.TryGetValue(typeof(T),out list) == false)
+				validations[typeof (T)] = list = new List<Action<object>>();
+
+			list.Add(o => validate((T) o));
+		}
+
+		public bool BeforeStore(string key, object entityInstance, RavenJObject metadata, RavenJObject original)
+		{
+			List<Action<object>> list;
+			if (validations.TryGetValue(entityInstance.GetType(), out list))
+			{
+				foreach (var validation in list)
+				{
+					validation(entityInstance);
+				}
+			}
+			return false;
+		}
+
+		public void AfterStore(string key, object entityInstance, RavenJObject metadata)
+		{
+		}
+	}
+}
+