Sensor.java

public class Sensor {

    private long id;
    private String label;
    private double temperature;
    private long timestamp;
    private int humidity;
    private double lux;
    private Double barPressure;
    private double vbat, vreg;

    Sensor(Map.Entry<String, JsonElement> entry, String label) {

        this.id = Long.valueOf(entry.getKey());
        this.label = label;

        JsonObject measurement = entry.getValue().getAsJsonObject();

        this.temperature = measurement.get("hum_temp").getAsDouble();
        this.timestamp = measurement.get("stamp").getAsLong();
        this.humidity = measurement.get("hum_hum").getAsInt();
        this.lux = measurement.get("lux").getAsDouble();
        this.barPressure = measurement.get("bar_pres_rel").isJsonNull() ? null : measurement.get("bar_pres_rel").getAsDouble();
        this.vbat = measurement.get("vbat").getAsDouble();
        this.vreg = measurement.get("vreg").getAsDouble();
    }
}