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using System;
using System.Text.Json;
using System.Text.Json.Serialization;
namespace MediaBrowser.Common.Json.Converters
{
/// <summary>
/// Converts a nullable struct or value to/from JSON.
/// Required - some clients send an empty string.
/// </summary>
/// <typeparam name="TStruct">The struct type.</typeparam>
public class JsonNullableStructConverter<TStruct> : JsonConverter<TStruct?>
where TStruct : struct
{
/// <inheritdoc />
public override TStruct? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
if (reader.TokenType == JsonTokenType.Null)
{
return null;
}
// Token is empty string.
if (reader.TokenType == JsonTokenType.String && ((reader.HasValueSequence && reader.ValueSequence.IsEmpty) || reader.ValueSpan.IsEmpty))
{
return null;
}
return JsonSerializer.Deserialize<TStruct>(ref reader, options);
}
/// <inheritdoc />
public override void Write(Utf8JsonWriter writer, TStruct? value, JsonSerializerOptions options)
{
if (value.HasValue)
{
JsonSerializer.Serialize(writer, value.Value, options);
}
else
{
writer.WriteNullValue();
}
}
}
}
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