apollo-api/com.apollographql.apollo.api/PresentAdapter/fromJson

fromJson

open override fun fromJson(reader: JsonReader, customScalarAdapters: CustomScalarAdapters): Optional.Present<T>

Deserializes the given Json to the expected Kotlin type.

implementations may throw com.apollographql.apollo.exception.JsonEncodingException or com.apollographql.apollo.exception.JsonDataException on unexpected incoming data

Example:

override fun fromJson(reader: JsonReader, customScalarAdapters: CustomScalarAdapters): LocalDateTime {
  return LocalDateTime.parse(reader.nextString()!!)
}

Alternatively, you can use the built-in AnyAdapter to simplify the parsing loop:

override fun fromJson(reader: JsonReader, customScalarAdapters: CustomScalarAdapters): GeoPoint {
  val map = AnyAdapter.fromJson(reader) as Map<String, Double>

  return GeoPoint(map["lat"]!!, map["lon"]!!)
}