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// 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.
#nullable disable
using System.IO;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Host;
using Microsoft.CodeAnalysis.Text;
namespace Microsoft.VisualStudio.LanguageServices.LiveShare.Client.Projects
{
/// <summary>
/// This is a FileTextLoader which no-ops if the file is not available on disk. This is the common case for
/// Cascade and throwing exceptions slows down GetText operations significantly enough to have visible UX impact.
/// </summary>
internal sealed class WorkspaceFileTextLoaderNoException : WorkspaceFileTextLoader
{
public WorkspaceFileTextLoaderNoException(SolutionServices services, string path, Encoding defaultEncoding)
: base(services, path, defaultEncoding)
{
}
public override Task<TextAndVersion> LoadTextAndVersionAsync(LoadTextOptions options, CancellationToken cancellationToken)
{
if (!File.Exists(Path))
{
return Task.FromResult(TextAndVersion.Create(SourceText.From("", encoding: null, options.ChecksumAlgorithm), VersionStamp.Create()));
}
return base.LoadTextAndVersionAsync(options, cancellationToken);
}
}
}
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