| | | 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.CodeAnalysis; |
| | | 6 | | |
| | | 7 | | namespace System.Text.Json.Serialization.Converters |
| | | 8 | | { |
| | | 9 | | internal sealed class ReadOnlyMemoryConverter<T> : JsonCollectionConverter<ReadOnlyMemory<T>, T> |
| | | 10 | | { |
| | 0 | 11 | | internal override bool CanHaveMetadata => false; |
| | 0 | 12 | | public override bool HandleNull => true; |
| | | 13 | | |
| | | 14 | | internal override bool OnTryRead( |
| | | 15 | | ref Utf8JsonReader reader, |
| | | 16 | | Type typeToConvert, |
| | | 17 | | JsonSerializerOptions options, |
| | | 18 | | scoped ref ReadStack state, |
| | | 19 | | out ReadOnlyMemory<T> value) |
| | 0 | 20 | | { |
| | 0 | 21 | | if (reader.TokenType is JsonTokenType.Null && state.Current.ReturnValue is null) |
| | 0 | 22 | | { |
| | 0 | 23 | | value = default; |
| | 0 | 24 | | return true; |
| | | 25 | | } |
| | | 26 | | |
| | 0 | 27 | | return base.OnTryRead(ref reader, typeToConvert, options, ref state, out value); |
| | 0 | 28 | | } |
| | | 29 | | |
| | | 30 | | protected override void Add(in T value, ref ReadStack state) |
| | 0 | 31 | | { |
| | 0 | 32 | | ((List<T>)state.Current.ReturnValue!).Add(value); |
| | 0 | 33 | | } |
| | | 34 | | |
| | | 35 | | protected override void CreateCollection(ref Utf8JsonReader reader, scoped ref ReadStack state, JsonSerializerOp |
| | 0 | 36 | | { |
| | 0 | 37 | | state.Current.ReturnValue = new List<T>(); |
| | 0 | 38 | | } |
| | | 39 | | |
| | 0 | 40 | | internal sealed override bool IsConvertibleCollection => true; |
| | | 41 | | protected override void ConvertCollection(ref ReadStack state, JsonSerializerOptions options) |
| | 0 | 42 | | { |
| | 0 | 43 | | ReadOnlyMemory<T> memory = ((List<T>)state.Current.ReturnValue!).ToArray().AsMemory(); |
| | 0 | 44 | | state.Current.ReturnValue = memory; |
| | 0 | 45 | | } |
| | | 46 | | |
| | | 47 | | protected override bool OnWriteResume(Utf8JsonWriter writer, ReadOnlyMemory<T> value, JsonSerializerOptions opti |
| | 0 | 48 | | { |
| | 0 | 49 | | return OnWriteResume(writer, value.Span, options, ref state); |
| | 0 | 50 | | } |
| | | 51 | | |
| | | 52 | | internal static bool OnWriteResume(Utf8JsonWriter writer, ReadOnlySpan<T> value, JsonSerializerOptions options, |
| | 0 | 53 | | { |
| | 0 | 54 | | int index = state.Current.EnumeratorIndex; |
| | | 55 | | |
| | 0 | 56 | | JsonConverter<T> elementConverter = GetElementConverter(ref state); |
| | | 57 | | |
| | 0 | 58 | | if (elementConverter.CanUseDirectReadOrWrite && state.Current.NumberHandling == null) |
| | 0 | 59 | | { |
| | | 60 | | // Fast path that avoids validation and extra indirection. |
| | 0 | 61 | | for (; index < value.Length; index++) |
| | 0 | 62 | | { |
| | 0 | 63 | | elementConverter.Write(writer, value[index], options); |
| | 0 | 64 | | } |
| | 0 | 65 | | } |
| | | 66 | | else |
| | 0 | 67 | | { |
| | 0 | 68 | | for (; index < value.Length; index++) |
| | 0 | 69 | | { |
| | 0 | 70 | | if (!elementConverter.TryWrite(writer, value[index], options, ref state)) |
| | 0 | 71 | | { |
| | 0 | 72 | | state.Current.EnumeratorIndex = index; |
| | 0 | 73 | | return false; |
| | | 74 | | } |
| | | 75 | | |
| | 0 | 76 | | state.Current.EndCollectionElement(); |
| | | 77 | | |
| | 0 | 78 | | if (ShouldFlush(ref state, writer)) |
| | 0 | 79 | | { |
| | 0 | 80 | | state.Current.EnumeratorIndex = ++index; |
| | 0 | 81 | | return false; |
| | | 82 | | } |
| | 0 | 83 | | } |
| | 0 | 84 | | } |
| | | 85 | | |
| | 0 | 86 | | return true; |
| | 0 | 87 | | } |
| | | 88 | | } |
| | | 89 | | } |