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Fallback to base jsonconverter

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crobibero
2020-09-01 09:19:22 -06:00
parent 1f2d73af8e
commit eb400f7292
3 changed files with 45 additions and 50 deletions
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56
MediaBrowser.Common/Json/Converters/JsonNullableInt64Converter.cs
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@@ -1,52 +1,42 @@
using System;
using System.ComponentModel;
using System.Text.Json;
using System.Text.Json.Serialization;
namespace MediaBrowser.Common.Json.Converters
{
/// <summary>
/// Parse JSON string as nullable long.
/// Javascript does not support 64-bit integers.
/// Converts a nullable int64 object or value to/from JSON.
/// Required - some clients send an empty string.
/// </summary>
public class JsonNullableInt64Converter : JsonConverter<long?>
{
/// <summary>
/// Read JSON string as int64.
/// </summary>
/// <param name="reader"><see cref="Utf8JsonReader"/>.</param>
/// <param name="type">Type.</param>
/// <param name="options">Options.</param>
/// <returns>Parsed value.</returns>
public override long? Read(ref Utf8JsonReader reader, Type type, JsonSerializerOptions options)
{
switch (reader.TokenType)
{
case JsonTokenType.String when (reader.HasValueSequence && reader.ValueSequence.IsEmpty) || reader.ValueSpan.IsEmpty:
case JsonTokenType.Null:
return null;
default:
// fallback to default handling
return reader.GetInt64();
}
}
private readonly JsonConverter<long?> _baseJsonConverter;
/// <summary>
/// Write long to JSON long.
/// Initializes a new instance of the <see cref="JsonNullableInt64Converter"/> class.
/// </summary>
/// <param name="writer"><see cref="Utf8JsonWriter"/>.</param>
/// <param name="value">Value to write.</param>
/// <param name="options">Options.</param>
/// <param name="baseJsonConverter">The base json converter.</param>
public JsonNullableInt64Converter(JsonConverter<long?> baseJsonConverter)
{
_baseJsonConverter = baseJsonConverter;
}
/// <inheritdoc />
public override long? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
if (reader.TokenType == JsonTokenType.String && ((reader.HasValueSequence && reader.ValueSequence.IsEmpty) || reader.ValueSpan.IsEmpty))
{
return null;
}
return _baseJsonConverter.Read(ref reader, typeToConvert, options);
}
/// <inheritdoc />
public override void Write(Utf8JsonWriter writer, long? value, JsonSerializerOptions options)
{
if (value is null)
{
writer.WriteNullValue();
}
else
{
writer.WriteNumberValue(value.Value);
}
_baseJsonConverter.Write(writer, value, options);
}
}
}