PushManager::isVirtualCalendar

private function isVirtualCalendar(SectionConnection $link): bool
{
	return (strpos($link->getVendorSectionId(), 'holiday.calendar.google.com'))
		|| (strpos($link->getVendorSectionId(), 'group.v.calendar.google.com'))
		|| (strpos($link->getVendorSectionId(), '@virtual'))
		|| (strpos($link->getSection()->getExternalType(), '_readonly'))
		|| (strpos($link->getSection()->getExternalType(), '_freebusy'))
		;
}