mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/FeatureManager.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.Activities.Presentation
   6 {
   7     using System.Collections.Generic;
   8     using System.Activities.Presentation.Internal.PropertyEditing;
   9     using System.Runtime;
  10
  11     class FeatureManager
  12     {
  13         EditingContext context;
  14
  15         HashSet<Type> initializedTypes;
  16
  17         public FeatureManager(EditingContext context)
  18         {
  19             this.context = context;
  20             initializedTypes = new HashSet<Type>();
  21         }
  22
  23         public void InitializeFeature(Type modelType)
  24         {
  25             Fx.Assert(modelType != null, "Why would anyone initialize a feature that is not associated with a type");
  26
  27             if (!initializedTypes.Contains(modelType))
  28             {
  29                 initializedTypes.Add(modelType);
  30                 foreach (FeatureAttribute featureAttribute in ExtensibilityAccessor.GetAttributes<FeatureAttribute>(modelType))
  31                 {
  32                     if (typeof(Feature).IsAssignableFrom(featureAttribute.Type))
  33                     {
  34                         Feature feature = (Feature)Activator.CreateInstance(featureAttribute.Type);
  35                         if (feature != null)
  36                         {
  37                             feature.Initialize(this.context, modelType);
  38                         }
  39                     }
  40                 }
  41                 if (modelType.IsGenericType)
  42                 {
  43                     InitializeFeature(modelType.GetGenericTypeDefinition());
  44                 }
  45             }
  46         }
  47     }
  48 }