mcs/class/System.ComponentModel.Composition/src/ComponentModel/System/ComponentModel/Composition/Hosting/CompositionBatch.SingleExportComposablePart.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.ComponentModel.Composition.Primitives;\r
   7 using System.Linq;\r
   8 using Microsoft.Internal;\r
   9 \r
  10 namespace System.ComponentModel.Composition.Hosting\r
  11 {\r
  12     partial class CompositionBatch\r
  13     {\r
  14         // Represents a part that exports a single export\r
  15         private class SingleExportComposablePart : ComposablePart\r
  16         {\r
  17             private readonly Export _export;\r
  18 \r
  19             public SingleExportComposablePart(Export export)\r
  20             {\r
  21                 Assumes.NotNull(export);\r
  22 \r
  23                 this._export = export;\r
  24             }\r
  25 \r
  26             public override IDictionary<string, object> Metadata\r
  27             {\r
  28                 get { return MetadataServices.EmptyMetadata; }\r
  29             }\r
  30 \r
  31             public override IEnumerable<ExportDefinition> ExportDefinitions\r
  32             {\r
  33                 get { return new ExportDefinition[] { _export.Definition }; }\r
  34             }\r
  35 \r
  36             public override IEnumerable<ImportDefinition> ImportDefinitions\r
  37             {\r
  38                 get { return Enumerable.Empty<ImportDefinition>(); }\r
  39             }\r
  40 \r
  41             public override object GetExportedValue(ExportDefinition definition)\r
  42             {\r
  43                 Requires.NotNull(definition, "definition");\r
  44 \r
  45                 if (definition != _export.Definition)\r
  46                 {\r
  47                     throw ExceptionBuilder.CreateExportDefinitionNotOnThisComposablePart("definition");\r
  48                 }\r
  49 \r
  50                 return _export.Value;\r
  51             }\r
  52 \r
  53             public override void SetImport(ImportDefinition definition, IEnumerable<Export> exports)\r
  54             {\r
  55                 Requires.NotNull(definition, "definition");\r
  56                 Requires.NotNullOrNullElements(exports, "exports");\r
  57 \r
  58                 throw ExceptionBuilder.CreateImportDefinitionNotOnThisComposablePart("definition");\r
  59             }\r
  60         }\r
  61     }\r
  62 }