// 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.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeActions;
 
namespace Microsoft.CodeAnalysis.CodeFixes
{
    /// <summary>
    /// A dummy fix all provider to represent a no-change provider.
    /// This is only used by public constructors for <see cref="FixAllContext"/>,
    /// our internal code fix engine always creates a FixAllContext with a non-null
    /// FixAllProvider. Using a <see cref="NoOpFixAllProvider"/> for the public constructors
    /// helps us to avoid a nullable <see cref="FixAllContext.FixAllProvider"/>.
    /// </summary>
    internal sealed class NoOpFixAllProvider : FixAllProvider
    {
        public static readonly NoOpFixAllProvider Instance = new();
 
        private NoOpFixAllProvider()
        {
        }
 
        public override Task<CodeAction?> GetFixAsync(FixAllContext fixAllContext)
            => Task.FromResult<CodeAction?>(null);
    }
}