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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.
using Microsoft.AspNetCore.Http;
namespace Microsoft.AspNetCore.Builder;
/// <summary>
/// A base class for building an new <see cref="Endpoint"/>.
/// </summary>
public abstract class EndpointBuilder
{
private List<Func<EndpointFilterFactoryContext, EndpointFilterDelegate, EndpointFilterDelegate>>? _filterFactories;
/// <summary>
/// Gets the list of filters that apply to this endpoint.
/// </summary>
public IList<Func<EndpointFilterFactoryContext, EndpointFilterDelegate, EndpointFilterDelegate>> FilterFactories => _filterFactories ??= new();
/// <summary>
/// Gets or sets the delegate used to process requests for the endpoint.
/// </summary>
public RequestDelegate? RequestDelegate { get; set; }
/// <summary>
/// Gets or sets the informational display name of this endpoint.
/// </summary>
public string? DisplayName { get; set; }
/// <summary>
/// Gets the collection of metadata associated with this endpoint.
/// </summary>
public IList<object> Metadata { get; } = new List<object>();
/// <summary>
/// Gets the <see cref="IServiceProvider"/> associated with the endpoint.
/// </summary>
public IServiceProvider ApplicationServices { get; init; } = EmptyServiceProvider.Instance;
/// <summary>
/// Creates an instance of <see cref="Endpoint"/> from the <see cref="EndpointBuilder"/>.
/// </summary>
/// <returns>The created <see cref="Endpoint"/>.</returns>
public abstract Endpoint Build();
private sealed class EmptyServiceProvider : IServiceProvider
{
public static EmptyServiceProvider Instance { get; } = new EmptyServiceProvider();
public object? GetService(Type serviceType) => null;
}
}
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