Result serializer

result_serializer.kt

override fun serialize(src: Result<*, *>?, typeOfSrc: Type?, context: JsonSerializationContext?): JsonElement? {
    return when (src) {
      
        // Ignore Loading or Err states
        is Result.Loading ->  context?.serialize("") 
        is Result.Err -> context?.serialize("")
        
        // Thanks God that the original type is passed inside the
        // ParameterizedType field.
        // It lets us to use it for a real serialization
        is Result.Ok -> {
            val parameterizedType = typeOfSrc as ParameterizedType
            // Basically we're serializing the Result<T, E> as a simple
            // T, only when the Result is .Ok
            return context?.serialize(src.value, parameterizedType.actualTypeArguments[0])
        }
      
        null -> null
    }
}