// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
 
namespace Microsoft.AspNetCore.Localization;
 
/// <summary>
/// An abstract base class provider for determining the culture information of an <see cref="HttpRequest"/>.
/// </summary>
public abstract class RequestCultureProvider : IRequestCultureProvider
{
    /// <summary>
    /// Result that indicates that this instance of <see cref="RequestCultureProvider" /> could not determine the
    /// request culture.
    /// </summary>
    protected static readonly Task<ProviderCultureResult?> NullProviderCultureResult = Task.FromResult(default(ProviderCultureResult));
 
    /// <summary>
    /// The current options for the <see cref="RequestLocalizationMiddleware"/>.
    /// </summary>
    public RequestLocalizationOptions? Options { get; set; }
 
    /// <inheritdoc />
    public abstract Task<ProviderCultureResult?> DetermineProviderCultureResult(HttpContext httpContext);
}