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ExportWorkspaceServiceFactoryAttribute.cs
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ExportWorkspaceServiceFactoryAttribute.cs
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// Copyright (c) Microsoft. All Rights Reserved. Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Composition;
namespace Microsoft.CodeAnalysis.Host.Mef
{
/// <summary>
/// Use this attribute to declare a <see cref="IWorkspaceServiceFactory"/> implementation for inclusion in a MEF-based workspace.
/// </summary>
[MetadataAttribute]
[AttributeUsage(AttributeTargets.Class)]
public class ExportWorkspaceServiceFactoryAttribute : ExportAttribute
{
/// <summary>
/// The assembly qualified name of the service's type.
/// </summary>
public string ServiceType { get; }
/// <summary>
/// The layer that the service is specified for; ServiceLayer.Default, etc.
/// </summary>
public string Layer { get; }
/// <summary>
/// Declares a <see cref="IWorkspaceServiceFactory"/> implementation for inclusion in a MEF-based workspace.
/// </summary>
/// <param name="serviceType">The type that will be used to retrieve the service from a <see cref="HostWorkspaceServices"/>.</param>
/// <param name="layer">The layer or workspace kind that the service is specified for; <see cref="ServiceLayer.Default" />, <see cref="WorkspaceKind.MiscellaneousFiles" />etc.</param>
public ExportWorkspaceServiceFactoryAttribute(Type serviceType, string layer = ServiceLayer.Default)
: base(typeof(IWorkspaceServiceFactory))
{
if (serviceType == null)
{
throw new ArgumentNullException(nameof(serviceType));
}
this.ServiceType = serviceType.AssemblyQualifiedName;
this.Layer = layer ?? throw new ArgumentNullException(nameof(layer));
}
}
}