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// -----------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
// -----------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.ComponentModel.Composition.Primitives;
namespace System.ComponentModel.Composition.Factories
{
partial class PartDefinitionFactory
{
private class DerivedComposablePartDefinition : ComposablePartDefinition
{
private readonly Func<ComposablePart> _partCreator;
private readonly IDictionary<string, object> _metadata;
private IEnumerable<ImportDefinition> _importDefinitions;
private IEnumerable<ExportDefinition> _exportDefinitions;
private readonly Func<IEnumerable<ImportDefinition>> _importsCreator;
private readonly Func<IEnumerable<ExportDefinition>> _exportsCreator;
public DerivedComposablePartDefinition(
IDictionary<string, object> metadata,
Func<ComposablePart> partCreator,
Func<IEnumerable<ImportDefinition>> importsCreator,
Func<IEnumerable<ExportDefinition>> exportsCreator)
{
this._metadata = metadata.AsReadOnly();
this._partCreator = partCreator;
this._importsCreator = importsCreator;
this._exportsCreator = exportsCreator;
}
public override IDictionary<string, object> Metadata
{
get { return this._metadata; }
}
public override IEnumerable<ExportDefinition> ExportDefinitions
{
get
{
if (this._exportDefinitions == null)
{
this._exportDefinitions = this._exportsCreator.Invoke() ?? Enumerable.Empty<ExportDefinition>();
}
return this._exportDefinitions;
}
}
public override IEnumerable<ImportDefinition> ImportDefinitions
{
get
{
if (this._importDefinitions == null)
{
this._importDefinitions = this._importsCreator.Invoke() ?? Enumerable.Empty<ImportDefinition>();
}
return this._importDefinitions;
}
}
public override ComposablePart CreatePart()
{
return this._partCreator();
}
}
}
}
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