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<?php
namespace Sabre\VObject\Component;
use DateTimeInterface;
use Sabre\VObject;
/**
* The VFreeBusy component.
*
* This component adds functionality to a component, specific for VFREEBUSY
* components.
*
* @copyright Copyright (C) fruux GmbH (https://fruux.com/)
* @author Evert Pot (http://evertpot.com/)
* @license http://sabre.io/license/ Modified BSD License
*/
class VFreeBusy extends VObject\Component
{
/**
* Checks based on the contained FREEBUSY information, if a timeslot is
* available.
*
* @return bool
*/
public function isFree(DateTimeInterface $start, DatetimeInterface $end)
{
foreach ($this->select('FREEBUSY') as $freebusy) {
// We are only interested in FBTYPE=BUSY (the default),
// FBTYPE=BUSY-TENTATIVE or FBTYPE=BUSY-UNAVAILABLE.
if (isset($freebusy['FBTYPE']) && 'BUSY' !== strtoupper(substr((string) $freebusy['FBTYPE'], 0, 4))) {
continue;
}
// The freebusy component can hold more than 1 value, separated by
// commas.
$periods = explode(',', (string) $freebusy);
foreach ($periods as $period) {
// Every period is formatted as [start]/[end]. The start is an
// absolute UTC time, the end may be an absolute UTC time, or
// duration (relative) value.
list($busyStart, $busyEnd) = explode('/', $period);
$busyStart = VObject\DateTimeParser::parse($busyStart);
$busyEnd = VObject\DateTimeParser::parse($busyEnd);
if ($busyEnd instanceof \DateInterval) {
$busyEnd = $busyStart->add($busyEnd);
}
if ($start < $busyEnd && $end > $busyStart) {
return false;
}
}
}
return true;
}
/**
* A simple list of validation rules.
*
* This is simply a list of properties, and how many times they either
* must or must not appear.
*
* Possible values per property:
* * 0 - Must not appear.
* * 1 - Must appear exactly once.
* * + - Must appear at least once.
* * * - Can appear any number of times.
* * ? - May appear, but not more than once.
*
* @var array
*/
public function getValidationRules()
{
return [
'UID' => 1,
'DTSTAMP' => 1,
'CONTACT' => '?',
'DTSTART' => '?',
'DTEND' => '?',
'ORGANIZER' => '?',
'URL' => '?',
'ATTENDEE' => '*',
'COMMENT' => '*',
'FREEBUSY' => '*',
'REQUEST-STATUS' => '*',
];
}
}
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