/**
* Add items to interval collection
*
* @param Collection $collection
* @param string $from
* @param string $to
* @param string $periodType
* @return void
*/
public function prepareIntervalsCollection($collection, $from, $to, $periodType = self::REPORT_PERIOD_TYPE_DAY)
{
$intervals = $this->getIntervals($from, $to, $periodType);
foreach ($intervals as $interval) {
$item = $this->_itemFactory->create();
$item->setPeriod($interval);
$item->setIsEmpty();
$collection->addItem($item);
}
}
