126 lines
3.7 KiB
PHP
126 lines
3.7 KiB
PHP
<?php
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/**
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* Recurrence computation class for the Calendar plugin
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*
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* Uitility class to compute instances of recurring events.
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*
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* @version @package_version@
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* @author Thomas Bruederli <bruederli@kolabsys.com>
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* @package @package_name@
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*
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* Copyright (C) 2012, Kolab Systems AG <contact@kolabsys.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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class calendar_recurrence
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{
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private $cal;
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private $event;
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private $next;
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private $engine;
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private $duration;
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private $hour = 0;
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/**
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* Default constructor
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*
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* @param object calendar The calendar plugin instance
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* @param array The event object to operate on
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*/
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function __construct($cal, $event)
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{
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// use Horde classes to compute recurring instances
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// TODO: replace with something that has less than 6'000 lines of code
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require_once(__DIR__ . '/Horde_Date_Recurrence.php');
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$this->cal = $cal;
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$this->event = $event;
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$this->next = new Horde_Date($event['start'], $cal->timezone->getName());
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$this->hour = $this->next->hour;
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if (is_object($event['start']) && is_object($event['end']))
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$this->duration = $event['start']->diff($event['end']);
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$this->engine = new Horde_Date_Recurrence($event['start']);
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$this->engine->fromRRule20(libcalendaring::to_rrule($event['recurrence']));
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if (is_array($event['recurrence']['EXDATE'])) {
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foreach ($event['recurrence']['EXDATE'] as $exdate) {
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if (is_a($exdate, 'DateTime')) {
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$this->engine->addException($exdate->format('Y'), $exdate->format('n'), $exdate->format('j'));
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}
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}
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}
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if (is_array($event['recurrence']['RDATE'])) {
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foreach ($event['recurrence']['RDATE'] as $rdate) {
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if (is_a($rdate, 'DateTime')) {
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$this->engine->addRDate($rdate->format('Y'), $rdate->format('n'), $rdate->format('j'));
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}
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}
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}
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}
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/**
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* Get date/time of the next occurence of this event
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*
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* @return mixed DateTime object or False if recurrence ended
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*/
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public function next_start()
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{
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$time = false;
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$after = clone $this->next;
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$after->mday = $after->mday + 1;
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if ($this->next && ($next = $this->engine->nextActiveRecurrence($after))) {
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if (!$next->after($this->next)) {
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// avoid endless loops if recurrence computation fails
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return false;
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}
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if ($this->event['allday']) {
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$next->hour = $this->hour; # fix time for all-day events
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$next->min = 0;
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}
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$time = $next->toDateTime();
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$this->next = $next;
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}
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return $time;
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}
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/**
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* Get the next recurring instance of this event
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*
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* @return mixed Array with event properties or False if recurrence ended
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*/
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public function next_instance()
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{
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if ($next_start = $this->next_start()) {
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$next_end = clone $next_start;
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$next_end->add($this->duration);
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$next = $this->event;
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$next['recurrence_id'] = $next_start->format('Y-m-d');
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$next['start'] = $next_start;
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$next['end'] = $next_end;
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unset($next['_formatobj']);
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return $next;
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}
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return false;
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}
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}
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