mcs/class/System.ComponentModel.Composition/Tests/ComponentModelUnitTest/System/ComponentModel/Composition/Factories/PartDefinitionFactory.DerivedComposablePartDefinition.cs

   1 // -----------------------------------------------------------------------\r
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.\r
   3 // -----------------------------------------------------------------------\r
   4 using System;\r
   5 using System.Collections.Generic;\r
   6 using System.Linq;\r
   7 using Microsoft.VisualStudio.TestTools.UnitTesting;\r
   8 using System.ComponentModel.Composition.Primitives;\r
   9 \r
  10 namespace System.ComponentModel.Composition.Factories\r
  11 {\r
  12     partial class PartDefinitionFactory\r
  13     {\r
  14         private class DerivedComposablePartDefinition : ComposablePartDefinition\r
  15         {\r
  16             private readonly Func<ComposablePart> _partCreator;\r
  17             private readonly IDictionary<string, object> _metadata;\r
  18             private IEnumerable<ImportDefinition> _importDefinitions;\r
  19             private IEnumerable<ExportDefinition> _exportDefinitions;\r
  20             private readonly Func<IEnumerable<ImportDefinition>> _importsCreator;\r
  21             private readonly Func<IEnumerable<ExportDefinition>> _exportsCreator;\r
  22 \r
  23 \r
  24             public DerivedComposablePartDefinition(\r
  25                 IDictionary<string, object> metadata,\r
  26                 Func<ComposablePart> partCreator,\r
  27                 Func<IEnumerable<ImportDefinition>> importsCreator,\r
  28                 Func<IEnumerable<ExportDefinition>> exportsCreator)\r
  29             {\r
  30                 this._metadata = metadata.AsReadOnly();\r
  31                 this._partCreator = partCreator;\r
  32                 this._importsCreator = importsCreator;\r
  33                 this._exportsCreator = exportsCreator;\r
  34             }\r
  35 \r
  36             public override IDictionary<string, object> Metadata\r
  37             {\r
  38                 get { return this._metadata; }\r
  39             }\r
  40 \r
  41             public override IEnumerable<ExportDefinition> ExportDefinitions\r
  42             {\r
  43                 get \r
  44                 {\r
  45                     if (this._exportDefinitions == null)\r
  46                     {\r
  47                         this._exportDefinitions = this._exportsCreator.Invoke() ?? Enumerable.Empty<ExportDefinition>();\r
  48                     }\r
  49                     return this._exportDefinitions; \r
  50                 }\r
  51             }\r
  52 \r
  53             public override IEnumerable<ImportDefinition> ImportDefinitions\r
  54             {\r
  55                 get\r
  56                 {\r
  57                     if (this._importDefinitions == null)\r
  58                     {\r
  59                         this._importDefinitions = this._importsCreator.Invoke() ?? Enumerable.Empty<ImportDefinition>();\r
  60                     }\r
  61                     return this._importDefinitions;\r
  62                 }\r
  63             }\r
  64 \r
  65             public override ComposablePart CreatePart()\r
  66             {\r
  67                 return this._partCreator();\r
  68             }\r
  69         }\r
  70     }\r
  71 }