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

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

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#1 by (4 votes)

1

I'm using a WeatherTime API.

When I get the weather data from 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 a value of "20" or a value of "27.4" in an Object type. This value is in degrees Celsius.

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

Double can not be converted to Long

The temperatura attribute with type Long is in my Clima.java class, I defined it from when I created the class and created the data types in the database. So, I CAN NOT change to String because I will use this data for statistical purposes.

What should I do to make the treatment if it is "20" (Long) or "27.4" does it 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 occurring in the setClimateData method 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 other sets work without any problems. Only in this one of the temperature that gives error, therefore can come as much an integer as decimal.

I tried to use Numeric but it just will not. He says he can not be a type.

I have tried some things. How to convert from Double to Long. I'm trying to use JPA and Hibernate to do this. It's just not what I want ...

api java

asked by anonymous 21.06.2018 / 02:27

1 answer

Close file (is being used by another process) MySQL: Windows or Linux? [closed]

score 4 · Accepted Answer

You can use instanceof to know whether 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);

If 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, use the superclass Number with a cast :

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