/**
* cache_event function
*
* Creates a new entry in the cache table for each date that the event appears
* (and does not already have an explicit RECURRENCE-ID instance, given its
* iCalendar UID).
*
* @param Ai1ec_Event $event Event to generate cache table for
*
* @return void
**/
public function cache_event(Ai1ec_Event &$event)
{
global $wpdb;
// Convert event timestamps to local for correct calculations of
// recurrence. Need to also remove PHP timezone offset for each date for
// SG_iCal to calculate correct recurring instances.
$event->start = $this->gmt_to_local($event->start) - date('Z', $event->start);
$event->end = $this->gmt_to_local($event->end) - date('Z', $event->end);
$evs = array();
$e = array('post_id' => $event->post_id, 'start' => $event->start, 'end' => $event->end);
$duration = $event->getDuration();
// Timestamp of today date + 3 years (94608000 seconds)
$tif = Ai1ec_Time_Utility::current_time(true) + 94608000;
// Always cache initial instance
$evs[] = $e;
$_start = $event->start;
$_end = $event->end;
if ($event->recurrence_rules) {
$start = $event->start;
$wdate = $startdate = iCalUtilityFunctions::_timestamp2date($_start, 6);
$enddate = iCalUtilityFunctions::_timestamp2date($tif, 6);
$exclude_dates = array();
$recurrence_dates = array();
if ($event->exception_rules) {
// creat an array for the rules
$exception_rules = $this->build_recurrence_rules_array($event->exception_rules);
$exception_rules = iCalUtilityFunctions::_setRexrule($exception_rules);
$result = array();
// The first array is the result and it is passed by reference
iCalUtilityFunctions::_recur2date($exclude_dates, $exception_rules, $wdate, $startdate, $enddate);
}
$recurrence_rules = $this->build_recurrence_rules_array($event->recurrence_rules);
$recurrence_rules = iCalUtilityFunctions::_setRexrule($recurrence_rules);
iCalUtilityFunctions::_recur2date($recurrence_dates, $recurrence_rules, $wdate, $startdate, $enddate);
// Add the instances
foreach ($recurrence_dates as $date => $bool) {
// The arrays are in the form timestamp => true so an isset call is what we need
if (isset($exclude_dates[$date])) {
continue;
}
$e['start'] = $date;
$e['end'] = $date + $duration;
$excluded = false;
// Check if exception dates match this occurence
if ($event->exception_dates) {
if ($this->date_match_exdates($date, $event->exception_dates)) {
$excluded = true;
}
}
// Add event only if it is not excluded
if ($excluded == false) {
$evs[] = $e;
}
}
}
// Make entries unique (sometimes recurrence generator creates duplicates?)
$evs_unique = array();
foreach ($evs as $ev) {
$evs_unique[md5(serialize($ev))] = $ev;
}
foreach ($evs_unique as $e) {
// Find out if this event instance is already accounted for by an
// overriding 'RECURRENCE-ID' of the same iCalendar feed (by comparing the
// UID, start date, recurrence). If so, then do not create duplicate
// instance of event.
$start = $this->local_to_gmt($e['start']) - date('Z', $e['start']);
$matching_event_id = $event->ical_uid ? $this->get_matching_event_id($event->ical_uid, $event->ical_feed_url, $start, false, $event->post_id) : NULL;
// If no other instance was found
if (NULL === $matching_event_id) {
$start = getdate($e['start']);
$end = getdate($e['end']);
$this->insert_event_in_cache_table($e);
}
}
return Ai1ec_Events_List_Helper::get_instance()->clean_post_cache($event->post_id);
}
