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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Diagnostics;
using System.Text.Json.Nodes;
using System.Text.Json.Schema;
namespace System.Text.Json.Serialization.Converters
{
internal sealed class JsonArrayConverter : JsonConverter<JsonArray?>
{
public override void Write(Utf8JsonWriter writer, JsonArray? value, JsonSerializerOptions options)
{
if (value is null)
{
writer.WriteNullValue();
return;
}
value.WriteTo(writer, options);
}
public override JsonArray? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
switch (reader.TokenType)
{
case JsonTokenType.StartArray:
return options.AllowDuplicateProperties
? ReadAsJsonElement(ref reader, options.GetNodeOptions())
: ReadAsJsonNode(ref reader, options.GetNodeOptions());
case JsonTokenType.Null:
return null;
default:
throw ThrowHelper.GetInvalidOperationException_ExpectedArray(reader.TokenType);
}
}
internal static JsonArray ReadAsJsonElement(ref Utf8JsonReader reader, JsonNodeOptions options)
{
JsonElement jElement = JsonElement.ParseValue(ref reader);
return new JsonArray(jElement, options);
}
internal static JsonArray ReadAsJsonNode(ref Utf8JsonReader reader, JsonNodeOptions options)
{
Debug.Assert(reader.TokenType == JsonTokenType.StartArray);
JsonArray jArray = new JsonArray(options);
while (reader.Read())
{
if (reader.TokenType == JsonTokenType.EndArray)
{
return jArray;
}
JsonNode? item = JsonNodeConverter.ReadAsJsonNode(ref reader, options);
jArray.Add(item);
}
// JSON is invalid so reader would have already thrown.
Debug.Fail("End array token not found.");
ThrowHelper.ThrowJsonException();
return null;
}
internal override JsonSchema? GetSchema(JsonNumberHandling _) => new() { Type = JsonSchemaType.Array };
}
}
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