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using System;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
namespace StardewModdingAPI.Toolkit.Serialization.Converters
{
/// <summary>The base implementation for simplified converters which deserialize <typeparamref name="T"/> without overriding serialization.</summary>
/// <typeparam name="T">The type to deserialize.</typeparam>
internal abstract class SimpleReadOnlyConverter<T> : JsonConverter
{
/*********
** Accessors
*********/
/// <summary>Whether this converter can write JSON.</summary>
public override bool CanWrite => false;
/*********
** Public methods
*********/
/// <summary>Get whether this instance can convert the specified object type.</summary>
/// <param name="objectType">The object type.</param>
public override bool CanConvert(Type objectType)
{
return objectType == typeof(T) || Nullable.GetUnderlyingType(objectType) == typeof(T);
}
/// <summary>Reads the JSON representation of the object.</summary>
/// <param name="reader">The JSON reader.</param>
/// <param name="objectType">The object type.</param>
/// <param name="existingValue">The object being read.</param>
/// <param name="serializer">The calling serializer.</param>
public override object? ReadJson(JsonReader reader, Type objectType, object? existingValue, JsonSerializer serializer)
{
string path = reader.Path;
switch (reader.TokenType)
{
case JsonToken.Null when Nullable.GetUnderlyingType(objectType) != null:
return null;
case JsonToken.StartObject:
return this.ReadObject(JObject.Load(reader), path);
case JsonToken.String:
{
string? value = JToken.Load(reader).Value<string>();
return value is not null
? this.ReadString(value, path)
: null;
}
default:
throw new SParseException($"Can't parse {typeof(T).Name} from {reader.TokenType} node (path: {reader.Path}).");
}
}
/// <summary>Writes the JSON representation of the object.</summary>
/// <param name="writer">The JSON writer.</param>
/// <param name="value">The value.</param>
/// <param name="serializer">The calling serializer.</param>
public override void WriteJson(JsonWriter writer, object? value, JsonSerializer serializer)
{
throw new InvalidOperationException("This converter does not write JSON.");
}
/*********
** Protected methods
*********/
/// <summary>Read a JSON object.</summary>
/// <param name="obj">The JSON object to read.</param>
/// <param name="path">The path to the current JSON node.</param>
protected virtual T ReadObject(JObject obj, string path)
{
throw new SParseException($"Can't parse {typeof(T).Name} from object node (path: {path}).");
}
/// <summary>Read a JSON string.</summary>
/// <param name="str">The JSON string value.</param>
/// <param name="path">The path to the current JSON node.</param>
protected virtual T ReadString(string str, string path)
{
throw new SParseException($"Can't parse {typeof(T).Name} from string node (path: {path}).");
}
}
}
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