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); } /// <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."); } /// <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.StartObject: return this.ReadObject(JObject.Load(reader), path); case JsonToken.String: return this.ReadString(JToken.Load(reader).Value<string>(), path); default: throw new SParseException($"Can't parse {typeof(T).Name} from {reader.TokenType} node (path: {reader.Path})."); } } /********* ** Protected methods *********/ /// <summary>Read a JSON object.</summary> /// <param name="obj">The JSON object to read.</param> /// <param name="path">The path to the current JSON node.</param> protected virtual T ReadObject(JObject obj, string path) { throw new SParseException($"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})."); } } }