Creating a Java archive for the user-defined indicator - 7.3

The new target definition is displayed in the location list.

In this Java project, you can find four Java classes that correspond to the four indicator categories listed in the Indicator Category view in the indicator editor.

Each one of these Java classes extends the UserDefIndicatorImpl indicator. The figure below illustrates an example using the MyAvgLength Java class.

package test.udi;

import org.talend.dataquality.indicators.sql.impl.UserDefIndicatorImpl;

/**
 * @author mzhao
 * 
 * A very simple example of a java implementation of a user defined indicator. This indicator returns a user defined
 * real value. It implements the minimum number of required methods.
 */
public class MyAvgLength extends UserDefIndicatorImpl {

    private double length = 0;

    @Override
    public boolean reset() {
        super.reset();
        length = 0;
        return true;
    }

    @Override
    public boolean handle(Object data) {
        super.handle(data);
        // an indicator which computes the average text length on data which are more than 2 characters (this means that
        // text values with less than 2 characters are not taken into account).
        int dataLength = (data != null) ? data.toString().length() : 0;
        if (dataLength > 2) {
            length += dataLength;
        }
        return true;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.talend.dataquality.indicators.impl.IndicatorImpl#finalizeComputation()
     */
    @Override
    public boolean finalizeComputation() {
        value = String.valueOf(this.length / (this.getCount() - this.getNullCount()));
        return super.finalizeComputation();
    }

}