ActiveRecord/Castle.ActiveRecord/Framework/Internal/NHibernateNullablesSupport.cs

   1 // Copyright 2004-2007 Castle Project - http://www.castleproject.org/
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14
  15 namespace Castle.ActiveRecord.Framework.Internal
  16 {
  17         using System;
  18
  19         internal class NHibernateNullablesSupport
  20         {
  21                 private const String NullableAsm = "Nullables";
  22
  23                 private const String NullableIType = "Nullables.NHibernate.{0}Type, Nullables.NHibernate";
  24
  25                 private static Type tINullableType;
  26
  27                 static NHibernateNullablesSupport()
  28                 {
  29                         try
  30                         {
  31                                 tINullableType = Type.GetType("Nullables.INullableType, " + NullableAsm, false);
  32                         }
  33                         catch
  34                         {
  35                                 //This can happen when someone is registerring to the AssemblyResolve event and doesn't handle
  36                                 // missing assemblies correctly.
  37                                 //For instance, MbUnit.AddIn.MbUnitTestRunner.AssemblyResolveHandler has this behavior.
  38                                 tINullableType = null;
  39                         }
  40                 }
  41
  42                 public static bool IsNHibernateNullableType(Type type)
  43                 {
  44                         return tINullableType != null && tINullableType.IsAssignableFrom(type);
  45                 }
  46
  47                 public static String GetITypeTypeNameForNHibernateNullable(Type type)
  48                 {
  49                         if (type == null)
  50                         {
  51                                 return null;
  52                         }
  53
  54                         bool isSupported = type.Assembly.GetName().Name == NullableAsm;
  55
  56                         if (!isSupported)
  57                         {
  58                                 throw new ActiveRecordException(String.Format("ActiveRecord does not support Nullable for {0} natively.", type));
  59                         }
  60
  61                         return String.Format(NullableIType, type.Name);
  62                 }
  63         }
  64 }