protected static Integer sumAsInteger(final List<?> slaveValues) {
        int sum = 0;
        for (final Object slaveValue : slaveValues) {
            final Number value = (Number) slaveValue;
            if (value != null) {
                sum += value.intValue();
            }
        }
        return sum;
    }
protected static Integer sumAsInteger ( final List < ? > slaveValues ) { int sum = 0 ; for ( final Object slaveValue : slaveValues ) { final Number value = ( Number ) slaveValue ; if ( value != null ) { sum += value . intValue ( ) ; } } return sum ; }
Helper method to get a sum of values (sum will be calculated as an
integer)

@param slaveValues
@return