using System.Reflection; using System.Runtime.CompilerServices; using System.Text.Json.Serialization.Metadata; namespace System.Text.Json.Serialization { [System.Runtime.CompilerServices.NullableContext(1)] [System.Runtime.CompilerServices.Nullable(0)] public abstract class JsonConverter { internal bool IsInternalConverterForNumberType; internal abstract ConverterStrategy ConverterStrategy { get; } internal bool CanUseDirectReadOrWrite { get; set; } internal virtual bool CanHaveIdMetadata => false; internal bool CanBePolymorphic { get; set; } [System.Runtime.CompilerServices.Nullable(2)] internal abstract Type ElementType { get; } [System.Runtime.CompilerServices.Nullable(2)] internal abstract Type KeyType { get; } internal bool IsValueType { get; set; } internal bool IsInternalConverter { get; set; } internal virtual Type RuntimeType => TypeToConvert; internal abstract Type TypeToConvert { get; } internal virtual bool ConstructorIsParameterized { get; } [System.Runtime.CompilerServices.Nullable(2)] internal ConstructorInfo ConstructorInfo { get; set; } internal virtual bool RequiresDynamicMemberAccessors { get; } internal JsonConverter() { } public abstract bool CanConvert(Type typeToConvert); internal virtual object CreateObject(JsonSerializerOptions options) { throw new InvalidOperationException(System.SR.NodeJsonObjectCustomConverterNotAllowedOnExtensionProperty); } internal virtual void ReadElementAndSetProperty(object obj, string propertyName, ref Utf8JsonReader reader, JsonSerializerOptions options, ref ReadStack state) { throw new InvalidOperationException(System.SR.NodeJsonObjectCustomConverterNotAllowedOnExtensionProperty); } internal abstract JsonPropertyInfo CreateJsonPropertyInfo(); internal abstract JsonParameterInfo CreateJsonParameterInfo(); internal abstract object ReadCoreAsObject(ref Utf8JsonReader reader, JsonSerializerOptions options, ref ReadStack state); internal bool ShouldFlush(Utf8JsonWriter writer, ref WriteStack state) { if (state.FlushThreshold > 0) return writer.BytesPending > state.FlushThreshold; return false; } internal abstract bool TryReadAsObject(ref Utf8JsonReader reader, JsonSerializerOptions options, ref ReadStack state, out object value); internal abstract bool TryWriteAsObject(Utf8JsonWriter writer, object value, JsonSerializerOptions options, ref WriteStack state); internal abstract bool WriteCoreAsObject(Utf8JsonWriter writer, object value, JsonSerializerOptions options, ref WriteStack state); internal abstract void WriteAsPropertyNameCoreAsObject(Utf8JsonWriter writer, object value, JsonSerializerOptions options, bool isWritingExtensionDataProperty); internal virtual void Initialize(JsonSerializerOptions options, JsonTypeInfo jsonTypeInfo = null) { } internal virtual void CreateInstanceForReferenceResolver(ref Utf8JsonReader reader, ref ReadStack state, JsonSerializerOptions options) { } [MethodImpl(MethodImplOptions.AggressiveInlining)] internal static bool SingleValueReadWithReadAhead(ConverterStrategy converterStrategy, ref Utf8JsonReader reader, ref ReadStack state) { if (!state.ReadAhead || converterStrategy != ConverterStrategy.Value) return reader.Read(); return DoSingleValueReadWithReadAhead(ref reader, ref state); } internal static bool DoSingleValueReadWithReadAhead(ref Utf8JsonReader reader, ref ReadStack state) { JsonReaderState currentState = reader.CurrentState; long bytesConsumed = reader.BytesConsumed; if (!reader.Read()) return false; JsonTokenType tokenType = reader.TokenType; if (tokenType == JsonTokenType.StartObject || tokenType == JsonTokenType.StartArray) { bool flag = reader.TrySkip(); reader = new Utf8JsonReader(reader.OriginalSpan.Slice(checked((int)bytesConsumed)), reader.IsFinalBlock, currentState); state.BytesConsumed += bytesConsumed; if (!flag) return false; ref reader.ReadWithVerify(); } return true; } } }