// Copyright © 2021 The CefSharp Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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using System;
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using System.Text.Json;
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using System.Text.Json.Serialization;
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namespace CefSharp.Internals.Json
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{
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/// <summary>
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/// System.Text.Json Enum Converter for the DevToolsClient
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/// Only handles enums as strings and converts from .Net naming
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/// to the naming convention used by DevTools protocol
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/// </summary>
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/// <typeparam name="T">type</typeparam>
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/// <remarks>
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/// There aren't any Type constraints on T currently, we just rely on the
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/// <see cref="JsonEnumConverterFactory"/> to only use this for
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/// Enum and Nullable Enum
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/// </remarks>
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public class JsonEnumConverter<T> : JsonConverter<T>
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{
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/// <inheritdoc/>
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public override T Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
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{
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var nullableType = Nullable.GetUnderlyingType(typeToConvert);
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var val = reader.GetString();
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if (nullableType == null)
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{
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return (T)JsonEnumConverterFactory.ConvertStringToEnum(val, typeToConvert);
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}
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if(string.IsNullOrEmpty(val))
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{
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return default;
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}
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return (T)JsonEnumConverterFactory.ConvertStringToEnum(val, nullableType);
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}
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/// <inheritdoc/>
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public override void Write(Utf8JsonWriter writer, T value, JsonSerializerOptions options)
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{
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//Not called when the Nullable enum value is null so we don't need to perform any sort of null checking
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var str = JsonEnumConverterFactory.ConvertEnumToString(value);
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writer.WriteStringValue(str);
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}
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}
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}
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