Java - What to do when JSON can come in Double and Long?

Question

I am using a Climatempo API.

When I get the weather data of a city via JSON I get the temperature as follows:

clima.setTemperatura((Long) dataNode.get("temperature"))

However, in the API documentation, when I use get("temperature") it can return me a value "20" or a value "27.4" in an Object type. This value is in degrees Celsius.

I’m having an exception in java that says (depending) that:

Double cannot be converted to Long

The attribute temperatura with the guy Longis in my Clima.java class, I have defined since when I created the class and created the data types in the database. So I CAN NOT switch to String, because I will use this data for statistical purposes.

What should I do to make the treatment if it comes "20" (Long) or "27.4" it does not cause these exceptions?

EDITION As requested in the comments, I will add more details.

I use the following method to access the API:

    @GetMapping("/clima/{idCidade}/agora")
    public ResponseEntity<Clima> getClimaAgora(@PathVariable(value = "idCidade") Long idCidade){
        JSONObject climateData = new JSONObject();
        ClimaTempoAPI ct = new ClimaTempoAPI();
        String weatherEndpoint = "/api/v1/weather/locale/"+idCidade+"/current?";
        climateData = ct.RequestWeather(weatherEndpoint);

        JSONObject dataNode = (JSONObject) climateData.get("data");     

        Clima clima = new Clima();
        clima = setClimateData(climateData, dataNode, clima);
        climaRepository.save(clima);        

        return ResponseEntity.ok().body(clima);
    }

The error is happening in the method setClimateData which has the following implementation in the same class:

public Clima setClimateData(JSONObject climateData, JSONObject dataNode, Clima clima){
   clima.setVelVento((Long) dataNode.get("wind_velocity"));
   clima.setDirVento((String) dataNode.get("wind_direction"));
   (...)
   clima.setTemperatura((Long) dataNode.get("temperature")  ); //Erro acontece aqui
}

All the others sets work without any problem. Only in this temperature it gives error, as can come both an integer number and decimal.

I tried using Numeric but it just won’t. It says it can’t be a type.

I have tried some things. How to convert from Double to Long. Take Object and convert to String (at the time of saving in the error database - I am using Spring Boot with JPA and Hibernate). It’s just not getting what I want...

Answer 1

You can use the instanceof to find out if it is Double or Long and then choose how to treat:

Object temperaturaObj = dataNode.get("temperature");
Long temperatura = temperaturaObj == null ? null
        : temperaturaObj instanceof Long ? (Long) temperaturaObj
        : ((Double) temperaturaObj).longValue();
clima.setTemperatura(temperatura);

Should you decide to switch to Double instead of Long:

Object temperaturaObj = dataNode.get("temperature");
Long temperatura = temperaturaObj == null ? null
        : temperaturaObj instanceof Double ? (Double) temperaturaObj
        : ((Long) temperaturaObj).doubleValue();
clima.setTemperatura(temperatura);

Or else, use the superclass Number with a cast:

Number temperatura = (Number) dataNode.get("temperature");
clima.setTemperatura(temperatura == null ? null : temperatura.longValue());