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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.Extensions.Internal;
namespace Microsoft.AspNetCore.Mvc.Formatters.Xml;
/// <summary>
/// Creates an <see cref="EnumerableWrapperProvider"/> for interface types implementing the
/// <see cref="IEnumerable{T}"/> type.
/// </summary>
public class EnumerableWrapperProviderFactory : IWrapperProviderFactory
{
private readonly IEnumerable<IWrapperProviderFactory> _wrapperProviderFactories;
/// <summary>
/// Initializes an <see cref="EnumerableWrapperProviderFactory"/> with a list
/// <see cref="IWrapperProviderFactory"/>.
/// </summary>
/// <param name="wrapperProviderFactories">List of <see cref="IWrapperProviderFactory"/>.</param>
public EnumerableWrapperProviderFactory(IEnumerable<IWrapperProviderFactory> wrapperProviderFactories)
{
ArgumentNullException.ThrowIfNull(wrapperProviderFactories);
_wrapperProviderFactories = wrapperProviderFactories;
}
/// <summary>
/// Gets an <see cref="EnumerableWrapperProvider"/> for the provided context.
/// </summary>
/// <param name="context">The <see cref="WrapperProviderContext"/>.</param>
/// <returns>An instance of <see cref="EnumerableWrapperProvider"/> if the declared type is
/// an interface and implements <see cref="IEnumerable{T}"/>.</returns>
public IWrapperProvider? GetProvider(WrapperProviderContext context)
{
ArgumentNullException.ThrowIfNull(context);
if (context.IsSerialization)
{
// Example: IEnumerable<SerializableError>
var declaredType = context.DeclaredType;
// We only wrap interfaces types(ex: IEnumerable<T>, IQueryable<T>, IList<T> etc.) and not
// concrete types like List<T>, Collection<T> which implement IEnumerable<T>.
if (declaredType != null && declaredType.IsInterface && declaredType.IsGenericType)
{
var enumerableOfT = ClosedGenericMatcher.ExtractGenericInterface(
declaredType,
typeof(IEnumerable<>));
if (enumerableOfT != null)
{
var elementType = enumerableOfT.GenericTypeArguments[0];
var wrapperProviderContext = new WrapperProviderContext(elementType, context.IsSerialization);
var elementWrapperProvider =
_wrapperProviderFactories.GetWrapperProvider(wrapperProviderContext);
return new EnumerableWrapperProvider(enumerableOfT, elementWrapperProvider);
}
}
}
return null;
}
}
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