mcs/class/System.ComponentModel.Composition/Tests/ComponentModelUnitTest/System/ComponentModel/Composition/Factories/CatalogFactory.MutableComposablePartCatalog.cs

   1 // -----------------------------------------------------------------------\r
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.\r
   3 // -----------------------------------------------------------------------\r
   4 using System;\r
   5 using System.ComponentModel.Composition.Primitives;\r
   6 using System.Linq;\r
   7 using System.Collections.Generic;\r
   8 using System.Collections.ObjectModel;\r
   9 using System.ComponentModel.Composition.Hosting;\r
  10 \r
  11 namespace System.ComponentModel.Composition.Factories\r
  12 {\r
  13     partial class CatalogFactory\r
  14     {\r
  15         public class MutableComposablePartCatalog : ComposablePartCatalog, INotifyComposablePartCatalogChanged\r
  16         {\r
  17             private readonly HashSet<ComposablePartDefinition> _definitions;\r
  18 \r
  19             public MutableComposablePartCatalog(IEnumerable<ComposablePartDefinition> definitions)\r
  20             {\r
  21                 _definitions = new HashSet<ComposablePartDefinition>(definitions);\r
  22             }\r
  23 \r
  24             public void AddDefinition(ComposablePartDefinition definition)\r
  25             {\r
  26                 OnDefinitionsChanged(definition, true);\r
  27             }\r
  28 \r
  29             public void RemoveDefinition(ComposablePartDefinition definition)\r
  30             {\r
  31                 OnDefinitionsChanged(definition, false);\r
  32             }\r
  33 \r
  34             public override IQueryable<ComposablePartDefinition> Parts\r
  35             {\r
  36                 get { return _definitions.AsQueryable(); }\r
  37             }\r
  38 \r
  39             private void OnDefinitionsChanged(ComposablePartDefinition definition, bool added)\r
  40             {\r
  41                 ComposablePartDefinition[] addedDefinitions = added ? new ComposablePartDefinition[] { definition } : new ComposablePartDefinition[0];\r
  42                 ComposablePartDefinition[] removeDefinitions = added ? new ComposablePartDefinition[0] : new ComposablePartDefinition[] { definition };\r
  43 \r
  44                 var e = new ComposablePartCatalogChangeEventArgs(addedDefinitions, removeDefinitions, null);\r
  45                 Changing(this, e);\r
  46 \r
  47                 if (added)\r
  48                 {\r
  49                     _definitions.Add(definition);\r
  50                 }\r
  51                 else\r
  52                 {\r
  53                     _definitions.Remove(definition);\r
  54                 }\r
  55 \r
  56                 if (Changed != null)\r
  57                 {\r
  58                     Changed(this, e);\r
  59                 }\r
  60             }\r
  61 \r
  62             public event EventHandler<ComposablePartCatalogChangeEventArgs> Changed;\r
  63 \r
  64             public event EventHandler<ComposablePartCatalogChangeEventArgs> Changing;\r
  65         }\r
  66     }\r
  67 }