How can the display name of measurements be directly set in Cumulocity/Java

Question

I want to send MeasurementValues to Cumulocity and visualize the data with the given tools. Which values are sent by my software is specified in a JSON and has to be changeable after compilation.

My issue:

The Java Cumulocity Framework doesn't allow me to specify the Name of the measurement fragment that will be displayed on their Website. The name is always the class name of the POJO I used to create the measurement. Since I want to send many different variables (which ones will also change over time), it isn't viable to just create many POJO classes beforehand.

My question:

How can I - sending measurements from one class - display different values in Cumulocity with different names using the Java Cumulocity Framework?

What I tried so far:

There is no measurement property that allows me to change the displayname
There is no way to change a class name at runtime (it's compiled ^^)
The Cumulocity Java Framework doesn't give me direct access to the property

score 3 · Accepted Answer · answered Feb 16 '18 at 14:17

I don't know if I fully understand which name of a measurement you want to change, but I'm assuming you mean the name of the measurement fragment.

When you have created a custom measurement in your Java project you have the possibility to annotate it with @Alias to provide your custom name

package c8y.tinkerforge.measurements;

import java.math.BigDecimal;

import org.svenson.AbstractDynamicProperties;
import org.svenson.JSONProperty;

import com.cumulocity.model.measurement.MeasurementValue;
import com.cumulocity.model.util.Alias;

@Alias("c8y_Acceleration")
public class AccelerationCombinedMeasurement extends AbstractDynamicProperties {

    private static final long serialVersionUID = -2491579656609755745L;

    public static final String DEFAULT_UNIT = "g";

    private final String unit;

    private MeasurementValue accelerationX;

    private MeasurementValue accelerationY;

    private MeasurementValue accelerationZ;

    public AccelerationCombinedMeasurement(double accelerationX, double accelerationY, double accelerationZ,
            final String unit) {
        this.unit = unit;
        this.accelerationX = new MeasurementValue(new BigDecimal(accelerationX), unit);
        this.accelerationY = new MeasurementValue(new BigDecimal(accelerationY), unit);
        this.accelerationZ = new MeasurementValue(new BigDecimal(accelerationZ), unit);
    }

    @JSONProperty("accelerationX")
    public MeasurementValue getAccelerationX() {
        return accelerationX;
    }

    public void setAccelerationX(double accelerationX) {
        this.accelerationX = new MeasurementValue(new BigDecimal(accelerationX), unit);
    }

    @JSONProperty("accelerationY")
    public MeasurementValue getAccelerationY() {
        return accelerationY;
    }

    public void setAccelerationY(double accelerationY) {
        this.accelerationY = new MeasurementValue(new BigDecimal(accelerationY), unit);
    }

    @JSONProperty("accelerationZ")
    public MeasurementValue getAccelerationZ() {
        return accelerationZ;
    }

    public void setAccelerationZ(double accelerationZ) {
        this.accelerationZ = new MeasurementValue(new BigDecimal(accelerationZ), unit);
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((accelerationX == null) ? 0 : accelerationX.hashCode());
        result = prime * result + ((accelerationY == null) ? 0 : accelerationY.hashCode());
        result = prime * result + ((accelerationZ == null) ? 0 : accelerationZ.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        AccelerationCombinedMeasurement other = (AccelerationCombinedMeasurement) obj;
        if (accelerationX == null) {
            if (other.accelerationX != null)
                return false;
        } else if (!accelerationX.equals(other.accelerationX))
            return false;
        if (accelerationY == null) {
            if (other.accelerationY != null)
                return false;
        } else if (!accelerationY.equals(other.accelerationY))
            return false;
        if (accelerationZ == null) {
            if (other.accelerationZ != null)
                return false;
        } else if (!accelerationZ.equals(other.accelerationZ))
            return false;
        return true;
    }

    @Override
    public String toString() {
        return "AccelerationCombinedMeasurement [accelerationX=" + accelerationX + ", accelerationY=" + accelerationY
                + ", accelerationZ=" + accelerationZ + "]";
    }

}

In this case it should use the name c8y_Acceleration. When I create a datapoint graph for a sensor which uses this measurment class you get this:

You can see the name in the red outline.

How can the display name of measurements be directly set in Cumulocity/Java

1 Answers1