/**
* Parses some information from calendar objects, used for optimized
* calendar-queries.
*
* Returns an array with the following keys:
* * etag
* * size
* * componentType
* * firstOccurence
* * lastOccurence
*
* @param string $calendarData
* @return array
*/
protected function getDenormalizedData($calendarData)
{
$vObject = VObject\Reader::read($calendarData);
$componentType = null;
$component = null;
$firstOccurence = null;
$lastOccurence = null;
foreach ($vObject->getComponents() as $component) {
if ($component->name !== 'VTIMEZONE') {
$componentType = $component->name;
break;
}
}
if (!$componentType) {
throw new \Sabre\DAV\Exception\BadRequest('Calendar objects must have a VJOURNAL, VEVENT or VTODO component');
}
if ($componentType === 'VEVENT') {
$firstOccurence = $component->DTSTART->getDateTime()->getTimeStamp();
// Finding the last occurence is a bit harder
if (!isset($component->RRULE)) {
if (isset($component->DTEND)) {
$lastOccurence = $component->DTEND->getDateTime()->getTimeStamp();
} elseif (isset($component->DURATION)) {
$endDate = clone $component->DTSTART->getDateTime();
$endDate->add(VObject\DateTimeParser::parse($component->DURATION->getValue()));
$lastOccurence = $endDate->getTimeStamp();
} elseif (!$component->DTSTART->hasTime()) {
$endDate = clone $component->DTSTART->getDateTime();
$endDate->modify('+1 day');
$lastOccurence = $endDate->getTimeStamp();
} else {
$lastOccurence = $firstOccurence;
}
} else {
$it = new VObject\RecurrenceIterator($vObject, (string) $component->UID);
$maxDate = new \DateTime(self::MAX_DATE);
if ($it->isInfinite()) {
$lastOccurence = $maxDate->getTimeStamp();
} else {
$end = $it->getDtEnd();
while ($it->valid() && $end < $maxDate) {
$end = $it->getDtEnd();
$it->next();
}
$lastOccurence = $end->getTimeStamp();
}
}
}
return array('etag' => md5($calendarData), 'size' => strlen($calendarData), 'componentType' => $componentType, 'firstOccurence' => $firstOccurence, 'lastOccurence' => $lastOccurence);
}
