| | | 1 | | // Licensed to the .NET Foundation under one or more agreements. |
| | | 2 | | // The .NET Foundation licenses this file to you under the MIT license. |
| | | 3 | | |
| | | 4 | | using System.Diagnostics; |
| | | 5 | | using System.Text.Json.Nodes; |
| | | 6 | | using System.Text.Json.Schema; |
| | | 7 | | using System.Text.Json.Serialization.Metadata; |
| | | 8 | | |
| | | 9 | | namespace System.Text.Json.Serialization.Converters |
| | | 10 | | { |
| | | 11 | | /// <summary> |
| | | 12 | | /// Provides a mechanism to invoke "fast-path" serialization logic via |
| | | 13 | | /// <see cref="JsonTypeInfo{T}.SerializeHandler"/>. This type holds an optional |
| | | 14 | | /// reference to an actual <see cref="JsonConverter{T}"/> for the type |
| | | 15 | | /// <typeparamref name="T"/>, to provide a fallback when the fast path cannot be used. |
| | | 16 | | /// </summary> |
| | | 17 | | /// <typeparam name="T">The type to converter</typeparam> |
| | | 18 | | internal sealed class JsonMetadataServicesConverter<T> : JsonResumableConverter<T> |
| | | 19 | | { |
| | | 20 | | // A backing converter for when fast-path logic cannot be used. |
| | 0 | 21 | | internal JsonConverter<T> Converter { get; } |
| | | 22 | | |
| | 0 | 23 | | internal override Type? KeyType => Converter.KeyType; |
| | 0 | 24 | | internal override Type? ElementType => Converter.ElementType; |
| | 0 | 25 | | internal override JsonConverter? NullableElementConverter => Converter.NullableElementConverter; |
| | 0 | 26 | | public override bool HandleNull { get; } |
| | | 27 | | |
| | 0 | 28 | | internal override bool ConstructorIsParameterized => Converter.ConstructorIsParameterized; |
| | 0 | 29 | | internal override bool SupportsCreateObjectDelegate => Converter.SupportsCreateObjectDelegate; |
| | 0 | 30 | | internal override bool CanHaveMetadata => Converter.CanHaveMetadata; |
| | | 31 | | |
| | 0 | 32 | | internal override bool CanPopulate => Converter.CanPopulate; |
| | | 33 | | |
| | 0 | 34 | | public JsonMetadataServicesConverter(JsonConverter<T> converter) |
| | 0 | 35 | | { |
| | 0 | 36 | | Converter = converter; |
| | 0 | 37 | | ConverterStrategy = converter.ConverterStrategy; |
| | 0 | 38 | | IsInternalConverter = converter.IsInternalConverter; |
| | 0 | 39 | | IsInternalConverterForNumberType = converter.IsInternalConverterForNumberType; |
| | 0 | 40 | | CanBePolymorphic = converter.CanBePolymorphic; |
| | | 41 | | |
| | | 42 | | // Ensure HandleNull values reflect the exact configuration of the source converter |
| | 0 | 43 | | HandleNullOnRead = converter.HandleNullOnRead; |
| | 0 | 44 | | HandleNullOnWrite = converter.HandleNullOnWrite; |
| | 0 | 45 | | HandleNull = converter.HandleNullOnWrite; |
| | 0 | 46 | | } |
| | | 47 | | |
| | | 48 | | internal override bool OnTryRead(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options, s |
| | 0 | 49 | | => Converter.OnTryRead(ref reader, typeToConvert, options, ref state, out value); |
| | | 50 | | |
| | | 51 | | internal override bool OnTryWrite(Utf8JsonWriter writer, T value, JsonSerializerOptions options, ref WriteStack |
| | 0 | 52 | | { |
| | 0 | 53 | | JsonTypeInfo jsonTypeInfo = state.Current.JsonTypeInfo; |
| | 0 | 54 | | Debug.Assert(jsonTypeInfo is JsonTypeInfo<T> typeInfo && typeInfo.SerializeHandler != null); |
| | | 55 | | |
| | 0 | 56 | | if (!state.SupportContinuation && |
| | 0 | 57 | | jsonTypeInfo.CanUseSerializeHandler && |
| | 0 | 58 | | !JsonHelpers.RequiresSpecialNumberHandlingOnWrite(state.Current.NumberHandling) && |
| | 0 | 59 | | !state.CurrentContainsMetadata) // Do not use the fast path if state needs to write metadata. |
| | 0 | 60 | | { |
| | 0 | 61 | | ((JsonTypeInfo<T>)jsonTypeInfo).SerializeHandler!(writer, value); |
| | 0 | 62 | | return true; |
| | | 63 | | } |
| | | 64 | | |
| | 0 | 65 | | return Converter.OnTryWrite(writer, value, options, ref state); |
| | 0 | 66 | | } |
| | | 67 | | |
| | | 68 | | internal override void ConfigureJsonTypeInfo(JsonTypeInfo jsonTypeInfo, JsonSerializerOptions options) |
| | 0 | 69 | | => Converter.ConfigureJsonTypeInfo(jsonTypeInfo, options); |
| | | 70 | | |
| | | 71 | | internal override JsonSchema? GetSchema(JsonNumberHandling numberHandling) |
| | 0 | 72 | | => Converter.GetSchema(numberHandling); |
| | | 73 | | } |
| | | 74 | | } |