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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 System.Diagnostics.CodeAnalysis;
namespace Microsoft.AspNetCore.Components.Endpoints.FormMapping;
internal sealed class NullableConverter<T>(FormDataConverter<T> nonNullableConverter) : FormDataConverter<T?>, ISingleValueConverter<T?> where T : struct
{
private readonly FormDataConverter<T> _nonNullableConverter = nonNullableConverter;
public bool CanConvertSingleValue() => _nonNullableConverter is ISingleValueConverter<T> singleValueConverter &&
singleValueConverter.CanConvertSingleValue();
public bool TryConvertValue(ref FormDataReader reader, string value, out T? result)
{
var converter = (ISingleValueConverter<T>)_nonNullableConverter;
if (converter.TryConvertValue(ref reader, value, out var converted))
{
result = converted;
return true;
}
else
{
result = null;
return false;
}
}
[RequiresDynamicCode(FormMappingHelpers.RequiresDynamicCodeMessage)]
[RequiresUnreferencedCode(FormMappingHelpers.RequiresUnreferencedCodeMessage)]
internal override bool TryRead(ref FormDataReader context, Type type, FormDataMapperOptions options, out T? result, out bool found)
{
if (!(_nonNullableConverter.TryRead(ref context, type, options, out var innerResult, out found) && found))
{
result = null;
return false;
}
else
{
result = innerResult;
return true;
}
}
}
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