// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using System;
using System.Collections.Immutable;
using System.Composition;
using Microsoft.CodeAnalysis.Host.Mef;
 
namespace Microsoft.CodeAnalysis.SolutionCrawler
{
    [ExportWorkspaceService(typeof(IDocumentTrackingService), ServiceLayer.Default)]
    [Shared]
    internal sealed class DefaultDocumentTrackingService : IDocumentTrackingService
    {
        [ImportingConstructor]
        [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
        public DefaultDocumentTrackingService()
        {
        }
 
        public bool SupportsDocumentTracking => false;
 
        public event EventHandler<DocumentId?> ActiveDocumentChanged { add { } remove { } }
        public event EventHandler<EventArgs> NonRoslynBufferTextChanged { add { } remove { } }
 
        public ImmutableArray<DocumentId> GetVisibleDocuments()
            => ImmutableArray<DocumentId>.Empty;
 
        public DocumentId? TryGetActiveDocument()
            => null;
    }
}