/**
* Adds ratio metrics if possible.
*
* @param DataTable $dataTable
* @return DataTable
*/
protected function manipulateDataTable($dataTable)
{
if (!empty($this->report) && !$this->report->getDimension() && !$this->isAllMetricsReport()) {
// we currently do not calculate the total value for reports having no dimension
return $dataTable;
}
$this->totals = array();
$firstLevelTable = $this->makeSureToWorkOnFirstLevelDataTable($dataTable);
$metricsToCalculate = Metrics::getMetricIdsToProcessReportTotal();
$metricNames = array();
foreach ($metricsToCalculate as $metricId) {
$metricNames[$metricId] = Metrics::getReadableColumnName($metricId);
}
foreach ($firstLevelTable->getRows() as $row) {
$columns = $row->getColumns();
foreach ($metricNames as $metricId => $metricName) {
$this->sumColumnValueToTotal($columns, $metricId, $metricName);
}
}
$dataTable->setMetadata('totals', $this->totals);
return $dataTable;
}
private function sumColumnValueToTotal(Row $row, $metricId, $totalValues)
{
$value = $this->getColumn($row, $metricId);
if (false === $value) {
return $totalValues;
}
$metricName = Metrics::getReadableColumnName($metricId);
if (array_key_exists($metricName, $totalValues)) {
$totalValues[$metricName] += $value;
} else {
$totalValues[$metricName] = $value;
}
return $totalValues;
}