friendica-addons/dav/SabreDAV/lib/Sabre/VObject/Component/VCalendar.php

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2012-06-03 20:19:28 +02:00
<?php
/**
* The VCalendar component
*
* This component adds functionality to a component, specific for a VCALENDAR.
*
* @package Sabre
* @subpackage VObject
* @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
* @author Evert Pot (http://www.rooftopsolutions.nl/)
* @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
*/
class Sabre_VObject_Component_VCalendar extends Sabre_VObject_Component {
/**
* Returns a list of all 'base components'. For instance, if an Event has
* a recurrence rule, and one instance is overridden, the overridden event
* will have the same UID, but will be excluded from this list.
*
* VTIMEZONE components will always be excluded.
*
* @param string $componentName filter by component name
* @return array
*/
public function getBaseComponents($componentName = null) {
$components = array();
foreach($this->children as $component) {
if (!$component instanceof Sabre_VObject_Component)
continue;
if (isset($component->{'RECURRENCE-ID'}))
continue;
if ($componentName && $component->name !== strtoupper($componentName))
continue;
if ($component->name === 'VTIMEZONE')
continue;
$components[] = $component;
}
return $components;
}
/**
* If this calendar object, has events with recurrence rules, this method
* can be used to expand the event into multiple sub-events.
*
* Each event will be stripped from it's recurrence information, and only
* the instances of the event in the specified timerange will be left
* alone.
*
* In addition, this method will cause timezone information to be stripped,
* and normalized to UTC.
*
* This method will alter the VCalendar. This cannot be reversed.
*
* This functionality is specifically used by the CalDAV standard. It is
* possible for clients to request expand events, if they are rather simple
* clients and do not have the possibility to calculate recurrences.
*
* @param DateTime $start
* @param DateTime $end
* @return void
*/
public function expand(DateTime $start, DateTime $end) {
$newEvents = array();
foreach($this->select('VEVENT') as $key=>$vevent) {
if (isset($vevent->{'RECURRENCE-ID'})) {
unset($this->children[$key]);
continue;
}
if (!$vevent->rrule) {
unset($this->children[$key]);
if ($vevent->isInTimeRange($start, $end)) {
$newEvents[] = $vevent;
}
continue;
}
$uid = (string)$vevent->uid;
if (!$uid) {
throw new LogicException('Event did not have a UID!');
}
$it = new Sabre_VObject_RecurrenceIterator($this, $vevent->uid);
$it->fastForward($start);
while($it->valid() && $it->getDTStart() < $end) {
if ($it->getDTEnd() > $start) {
$newEvents[] = $it->getEventObject();
}
$it->next();
}
unset($this->children[$key]);
}
foreach($newEvents as $newEvent) {
foreach($newEvent->children as $child) {
if ($child instanceof Sabre_VObject_Property_DateTime &&
$child->getDateType() == Sabre_VObject_Property_DateTime::LOCALTZ) {
$child->setDateTime($child->getDateTime(),Sabre_VObject_Property_DateTime::UTC);
}
}
$this->add($newEvent);
}
// Removing all VTIMEZONE components
unset($this->VTIMEZONE);
}
}