| | | 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.Collections.Generic; |
| | | 5 | | using System.Diagnostics; |
| | | 6 | | using System.Text.Json.Serialization.Metadata; |
| | | 7 | | |
| | | 8 | | namespace System.Text.Json.Serialization.Converters |
| | | 9 | | { |
| | | 10 | | /// <summary> |
| | | 11 | | /// A specialized converter implementation used for root-level value |
| | | 12 | | /// streaming in the JsonSerializer.DeserializeAsyncEnumerable methods. |
| | | 13 | | /// </summary> |
| | | 14 | | internal sealed class RootLevelListConverter<T> : JsonResumableConverter<List<T?>> |
| | | 15 | | { |
| | | 16 | | private readonly JsonTypeInfo<T> _elementTypeInfo; |
| | 0 | 17 | | private protected sealed override ConverterStrategy GetDefaultConverterStrategy() => ConverterStrategy.Enumerabl |
| | 0 | 18 | | internal override Type? ElementType => typeof(T); |
| | | 19 | | |
| | 0 | 20 | | public RootLevelListConverter(JsonTypeInfo<T> elementTypeInfo) |
| | 0 | 21 | | { |
| | 0 | 22 | | IsRootLevelMultiContentStreamingConverter = true; |
| | 0 | 23 | | _elementTypeInfo = elementTypeInfo; |
| | 0 | 24 | | } |
| | | 25 | | |
| | | 26 | | internal override bool OnTryRead(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options, s |
| | 0 | 27 | | { |
| | 0 | 28 | | Debug.Assert(reader.AllowMultipleValues, "Can only be used by readers allowing trailing content."); |
| | | 29 | | |
| | 0 | 30 | | JsonConverter<T> elementConverter = _elementTypeInfo.EffectiveConverter; |
| | 0 | 31 | | state.Current.JsonPropertyInfo = _elementTypeInfo.PropertyInfoForTypeInfo; |
| | 0 | 32 | | var results = (List<T?>?)state.Current.ReturnValue; |
| | | 33 | | |
| | 0 | 34 | | while (true) |
| | 0 | 35 | | { |
| | 0 | 36 | | if (state.Current.PropertyState < StackFramePropertyState.ReadValue) |
| | 0 | 37 | | { |
| | 0 | 38 | | if (!reader.TryAdvanceToNextRootLevelValueWithOptionalReadAhead(elementConverter.RequiresReadAhead, |
| | 0 | 39 | | { |
| | 0 | 40 | | if (isAtEndOfStream) |
| | 0 | 41 | | { |
| | | 42 | | // No more root-level JSON values in the stream |
| | | 43 | | // complete the deserialization process. |
| | 0 | 44 | | value = results; |
| | 0 | 45 | | return true; |
| | | 46 | | } |
| | | 47 | | |
| | | 48 | | // New root-level JSON value found, need to read more data. |
| | 0 | 49 | | value = default; |
| | 0 | 50 | | return false; |
| | | 51 | | } |
| | | 52 | | |
| | 0 | 53 | | state.Current.PropertyState = StackFramePropertyState.ReadValue; |
| | 0 | 54 | | } |
| | | 55 | | |
| | | 56 | | // Deserialize the next root-level JSON value. |
| | 0 | 57 | | if (!elementConverter.TryRead(ref reader, typeof(T), options, ref state, out T? element, out _)) |
| | 0 | 58 | | { |
| | 0 | 59 | | value = default; |
| | 0 | 60 | | return false; |
| | | 61 | | } |
| | | 62 | | |
| | 0 | 63 | | if (results is null) |
| | 0 | 64 | | { |
| | 0 | 65 | | state.Current.ReturnValue = results = []; |
| | 0 | 66 | | } |
| | | 67 | | |
| | 0 | 68 | | results.Add(element); |
| | 0 | 69 | | state.Current.EndElement(); |
| | 0 | 70 | | } |
| | 0 | 71 | | } |
| | | 72 | | } |
| | | 73 | | } |