Calculates an ilDateList for a given calendar entry and recurrence rule. More...

Collaboration diagram for ilCalendarRecurrenceCalculator:

Public Member Functions
	__construct (ilDatePeriod $entry, ilCalendarRecurrenceCalculation $rec)
	@access public More...

	calculateDateListByMonth ($a_month, $a_year)
	calculate day list by month(s) uses a cache of calculated recurring events @access public More...

	calculateDateList (ilDateTime $a_start, ilDateTime $a_end, $a_limit=-1)
	calculate date list More...

Protected Member Functions
	getDuration ()
	Get duration of event. More...

	applyDurationPeriod (ilDateList $list, ilDateTime $start, ilDateTime $end)
	Apply duration period. More...

	adjustTimeZones (ilDateTime $a_start, ilDateTime $a_end)
	Adjust timezone. More...

	optimizeStartingTime ()
	optimize starting time More...

	incrementByFrequency ($start)
	increment starting time by frequency More...

	applyBYMONTHRules (ilDateList $list)
	Apply BYMONTH rules. More...

	applyBYWEEKNORules (ilDateList $list)
	Apply BYWEEKNO rules (1 to 53 and -1 to -53). More...

	applyBYYEARDAYRules (ilDateList $list)
	Apply BYYEARDAY rules. More...

	applyBYMONTHDAYRules (ilDateList $list)
	Apply BYMONTHDAY rules. More...

	applyBYDAYRules (ilDateList $list)
	Apply BYDAY rules. More...

	getYearWeekDays (ilDateTime $seed)
	get a list of year week days according to the BYMONTH rule More...

	getMonthWeekDays ($year, $month)
	get a list of month days More...

	getWeekWeekDays ($seed_info)
	get weedays of week More...

	applyBYSETPOSRules (ilDateList $list)
	Apply BYSETPOST rules. More...

	applyLimits (ilDateList $list)
	Apply limits (count or until) More...

	applyExclusionDates ()

	initDateList ()
	init date list More...

	createDate ($a_date, $a_format_type=IL_CAL_UNIX)
	create date More...

	validateRecurrence ()
	validate recurrence More...

Protected Attributes
	$timezone = null

	$log = null

	$limit_reached = false

	$valid_dates = null

	$period_start = null

	$period_end = null

	$start = null

	$event = null

	$duration = null

	$recurrence = null

	$frequence_context = 0

Detailed Description

Calculates an ilDateList for a given calendar entry and recurrence rule.

Author: Stefan Meyer meyer.nosp@m.@lei.nosp@m.fos.c.nosp@m.om

Version: $Id$

@ilCtrl_Calls

Definition at line 41 of file class.ilCalendarRecurrenceCalculator.php.

Constructor & Destructor Documentation

◆ __construct()

ilCalendarRecurrenceCalculator::__construct	(	ilDatePeriod	$entry,
		ilCalendarRecurrenceCalculation	$rec
	)

@access public

Parameters

ilDatePeriod interface ilDatePeriod

Definition at line 65 of file class.ilCalendarRecurrenceCalculator.php.

    {
        $this->log = $GLOBALS['DIC']->logger()->cal();
        $this->event = $entry;
        $this->recurrence = $rec;
        
        $this->duration = $entry->getEnd()->get(IL_CAL_UNIX) - $entry->getStart()->get(IL_CAL_UNIX);
    }

References $GLOBALS, ilDatePeriod\getEnd(), ilDatePeriod\getStart(), and IL_CAL_UNIX.

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Member Function Documentation

◆ adjustTimeZones()

ilCalendarRecurrenceCalculator::adjustTimeZones	(	ilDateTime	$a_start,
		ilDateTime	$a_end
	)

protected

Adjust timezone.

@access protected

Definition at line 230 of file class.ilCalendarRecurrenceCalculator.php.

    {
        $this->timezone = $this->event->isFullday() ? ilTimeZone::UTC : $this->recurrence->getTimeZone();
        ilTimeZone::_setDefaultTimeZone($this->timezone);
        
        $this->period_start = clone $a_start;
        $this->period_end = clone $a_end;
        $this->start = clone $this->event->getStart();
        
        try {
            if ($this->event->isFullday()) {
                $this->period_start->switchTimeZone(ilTimeZone::UTC);
                $this->period_end->switchTimeZone(ilTimeZone::UTC);
                $this->start->switchTimeZone(ilTimeZone::UTC);
            } else {
                $this->period_start->switchTimeZone($this->recurrence->getTimeZone());
                $this->period_end->switchTimeZone($this->recurrence->getTimeZone());
                $this->start->switchTimeZone($this->recurrence->getTimeZone());
            }
            return true;
        } catch (ilDateTimeException $e) {
            $this->log->write(__METHOD__ . ': ' . $e->getMessage());
            return false;
        }
    }

References ilTimeZone\_setDefaultTimeZone(), ilDateTime\switchTimeZone(), and ilTimeZone\UTC.

Referenced by calculateDateList().

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◆ applyBYDAYRules()

ilCalendarRecurrenceCalculator::applyBYDAYRules ( ilDateList $list )

protected

Apply BYDAY rules.

@access protected

Parameters

object ilDateList

Returns: object ilDateList

Definition at line 555 of file class.ilCalendarRecurrenceCalculator.php.

    {
        // return unmodified, if no byday rules are available
        if (!$this->recurrence->getBYDAYList()) {
            return $list;
        }
 
        $days_list = $this->initDateList();
 
        // generate a list of e.g all Sundays for the given year
        // or e.g a list of all week days in a give month (FREQ = MONTHLY,WEEKLY or DAILY)
        foreach ($list->get() as $seed) {
            $seed_info = $seed->get(IL_CAL_FKT_GETDATE);
            
            // TODO: maybe not correct in dst cases
            $date_info = $seed->get(IL_CAL_FKT_GETDATE);
            $date_info['mday'] = 1;
            $date_info['mon'] = 1;
            $start = $this->createDate($date_info, IL_CAL_FKT_GETDATE);
 
            switch ($this->frequence_context) {
                case ilCalendarRecurrence::FREQ_YEARLY:
                    $day_sequence = $this->getYearWeekDays($seed);
                    break;
                    
                case ilCalendarRecurrence::FREQ_MONTHLY:
                    $day_sequence = $this->getMonthWeekDays($seed_info['year'], $seed_info['mon']);
                    break;
 
                case ilCalendarRecurrence::FREQ_WEEKLY:
                    // TODO or RFC bug: FREQ>WEEKLY;BYMONTH=1;BYDAY=FR returns FR 1.2.2008
                    // Ical says: apply BYMONTH rules and after that apply byday rules on that date list.
                    $day_sequence = $this->getWeekWeekDays($seed_info);
                    break;
 
                case ilCalendarRecurrence::FREQ_DAILY:
                    $day_sequence[strtoupper(substr($seed->get(IL_CAL_FKT_DATE, 'D'), 0, 2))] = array($seed_info['yday']);
                    break;
 
            }
            foreach ($this->recurrence->getBYDAYList() as $byday) {
                $year_day = array();
                $day =  strtoupper(substr($byday, -2));
                $num_by_day = (int) $byday;
                
                if ($num_by_day) {
                    if ($num_by_day > 0) {
                        if (isset($day_sequence[$day][$num_by_day - 1])) {
                            $year_day =  array($day_sequence[$day][$num_by_day - 1]);
                        }
                    } else {
                        if (isset($day_sequence[$day][count($day_sequence[$day]) + $num_by_day])) {
                            $year_day = array($day_sequence[$day][count($day_sequence[$day]) + $num_by_day]);
                        }
                    }
                } else {
                    if (isset($day_sequence[$day])) {
                        $year_day = $day_sequence[$day];
                    }
                }
                foreach ($year_day as $day) {
                    switch ($this->frequence_context) {
                        case ilCalendarRecurrence::FREQ_WEEKLY:
                        case ilCalendarRecurrence::FREQ_DAILY:
                        case ilCalendarRecurrence::FREQ_MONTHLY:
                        case ilCalendarRecurrence::FREQ_YEARLY:
                            $tmp_date = clone $start;
                            $tmp_date->increment(IL_CAL_DAY, $day);
                            $days_list->add($tmp_date);
                            break;
                    }
                }
            }
        }
        #echo $days_list;
 
        return $days_list;
    }

References $list, $start, createDate(), ilCalendarRecurrence\FREQ_DAILY, ilCalendarRecurrence\FREQ_MONTHLY, ilCalendarRecurrence\FREQ_WEEKLY, ilCalendarRecurrence\FREQ_YEARLY, ilDateList\get(), getMonthWeekDays(), getWeekWeekDays(), getYearWeekDays(), IL_CAL_DAY, IL_CAL_FKT_DATE, IL_CAL_FKT_GETDATE, and initDateList().

Referenced by calculateDateList().

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◆ applyBYMONTHDAYRules()

ilCalendarRecurrenceCalculator::applyBYMONTHDAYRules ( ilDateList $list )

protected

Apply BYMONTHDAY rules.

@access protected

Definition at line 459 of file class.ilCalendarRecurrenceCalculator.php.

    {
        // return unmodified, if no byweekno rules are available
        if (!$this->recurrence->getBYMONTHDAYList()) {
            return $list;
        }
        $days_list = $this->initDateList();
        foreach ($list->get() as $seed) {
            $num_days = ilCalendarUtil::_getMaxDayOfMonth(
                $seed->get(IL_CAL_FKT_DATE, 'Y', $this->timezone),
                $seed->get(IL_CAL_FKT_DATE, 'n', $this->timezone)
            );
            /*
            $num_days = cal_days_in_month(CAL_GREGORIAN,
                $seed->get(IL_CAL_FKT_DATE,'n',$this->timezone),
                $seed->get(IL_CAL_FKT_DATE,'Y',$this->timezone));
            */
            #$this->log->write(__METHOD__.': Month '.$seed->get(IL_CAL_FKT_DATE,'M',$this->timezone).' has '.$num_days.' days.');
            
            foreach ($this->recurrence->getBYMONTHDAYList() as $bymonth_no) {
                $day_no = $bymonth_no < 0 ? ($num_days + $bymonth_no + 1) : $bymonth_no;
                if ($this->frequence_context != ilCalendarRecurrence::FREQ_YEARLY) {
                    if ($day_no < 1 or $day_no > $num_days) {
                        $this->log->write(__METHOD__ . ': Ignoring BYMONTHDAY rule: ' . $day_no . ' for month ' .
                            $seed->get(IL_CAL_FKT_DATE, 'M', $this->timezone));
                        continue;
                    }
                }
                $day_diff = $day_no - $seed->get(IL_CAL_FKT_DATE, 'j', $this->timezone);
                $new_day = $this->createDate($seed->get(IL_CAL_UNIX, '', $this->timezone));
                $new_day->increment(ilDateTime::DAY, $day_diff);
                
                switch ($this->frequence_context) {
                    case ilCalendarRecurrence::FREQ_DAILY:
                        // Check if day matches
                        #var_dump("<pre>",$seed->get(IL_CAL_FKT_DATE,'z',$this->timezone),$day_no,"</pre>");
                        if ($seed->get(IL_CAL_FKT_DATE, 'j', $this->timezone) == $day_no) {
                            $days_list->add($new_day);
                        }
                        break;
 
                    case ilCalendarRecurrence::FREQ_WEEKLY:
                        // Check if week matches
                        if ($seed->get(IL_CAL_FKT_DATE, 'W', $this->timezone) == $new_day->get(IL_CAL_FKT_DATE, 'W', $this->timezone)) {
                            $days_list->add($new_day);
                        }
                        break;
 
                    case ilCalendarRecurrence::FREQ_MONTHLY:
                        // seed and new day are in the same month.
                        $days_list->add($new_day);
                        break;
 
                    case ilCalendarRecurrence::FREQ_YEARLY:
                        $h = $this->event->isFullday() ? 0 : $seed->get(IL_CAL_FKT_DATE, 'H', $this->timezone);
                        $i = $this->event->isFullday() ? 0 : $seed->get(IL_CAL_FKT_DATE, 'i', $this->timezone);
                        $s = $this->event->isFullday() ? 0 : $seed->get(IL_CAL_FKT_DATE, 's', $this->timezone);
                        $y = $seed->get(IL_CAL_FKT_DATE, 'Y', $this->timezone);
 
                        // TODO: the chosen monthday has to added to all months
                        for ($month = 1;$month <= 12;$month++) {
                            #$num_days = cal_days_in_month(CAL_GREGORIAN,
                            #   $month,
                            #   $y);
                            $num_days = ilCalendarUtil::_getMaxDayOfMonth(
                                $y,
                                $month
                            );
                            $day_no = $bymonth_no < 0 ? ($num_days + $bymonth_no + 1) : $bymonth_no;
                            if ($day_no < 1 or $day_no > $num_days) {
                                $this->log->write(__METHOD__ . ': Ignoring BYMONTHDAY rule: ' . $day_no . ' for month ' . $month);
                            } else {
                                $tz_obj = ilTimeZone::_getInstance($this->timezone);
                                $tz_obj->switchTZ();
                                $unix = mktime($h, $i, $s, $month, $day_no, $y);
                                $tz_obj->restoreTZ();
                                $new_day = $this->createDate($unix);
                                $days_list->add($new_day);
                            }
                        }
                        break;
                }
            }
        }
        $this->frequence_context = ilCalendarRecurrence::FREQ_DAILY;
        return $days_list;
    }

References $h, $i, $list, $s, $y, ilTimeZone\_getInstance(), ilCalendarUtil\_getMaxDayOfMonth(), createDate(), ilDateTime\DAY, ilCalendarRecurrence\FREQ_DAILY, ilCalendarRecurrence\FREQ_MONTHLY, ilCalendarRecurrence\FREQ_WEEKLY, ilCalendarRecurrence\FREQ_YEARLY, ilDateList\get(), IL_CAL_FKT_DATE, IL_CAL_UNIX, and initDateList().

Referenced by calculateDateList().

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◆ applyBYMONTHRules()

ilCalendarRecurrenceCalculator::applyBYMONTHRules ( ilDateList $list )

protected

Apply BYMONTH rules.

@access protected

Returns: object ilDateList

Definition at line 319 of file class.ilCalendarRecurrenceCalculator.php.

    {
        // return unmodified, if no bymonth rules are available
        if (!$this->recurrence->getBYMONTHList()) {
            return $list;
        }
        $month_list = $this->initDateList();
        foreach ($list->get() as $date) {
            #echo "SEED: ".$seed;
            
            foreach ($this->recurrence->getBYMONTHList() as $month) {
                #echo "RULW_MONTH:".$month;
                
                // YEARLY rules extend the seed to every month given in the BYMONTH rule
                // Rules < YEARLY must match the month of the seed
                if ($this->recurrence->getFrequenceType() == ilCalendarRecurrence::FREQ_YEARLY) {
                    $month_date = $this->createDate($date->get(IL_CAL_UNIX, '', $this->timezone));
                    $month_date->increment(ilDateTime::MONTH, -($date->get(IL_CAL_FKT_DATE, 'n', $this->timezone) - $month));
                    
                    #echo "BYMONTH: ".$month_date;
                    $month_list->add($month_date);
                } elseif ($date->get(IL_CAL_FKT_DATE, 'n', $this->timezone) == $month) {
                    $month_list->add($date);
                }
            }
        }
        // decrease the frequence_context for YEARLY rules
        if ($this->recurrence->getFrequenceType() == ilCalendarRecurrence::FREQ_YEARLY) {
            $this->frequence_context = ilCalendarRecurrence::FREQ_MONTHLY;
        }
        return $month_list;
    }

References $list, createDate(), ilCalendarRecurrence\FREQ_MONTHLY, ilCalendarRecurrence\FREQ_YEARLY, ilDateList\get(), IL_CAL_FKT_DATE, IL_CAL_UNIX, initDateList(), and ilDateTime\MONTH.

Referenced by calculateDateList().

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◆ applyBYSETPOSRules()

ilCalendarRecurrenceCalculator::applyBYSETPOSRules ( ilDateList $list )

protected

Apply BYSETPOST rules.

@access protected

Parameters

object ilDateList

Returns: object ilDateList

Definition at line 723 of file class.ilCalendarRecurrenceCalculator.php.

    {
        // return unmodified, if no bysetpos rules are available
        if (!$this->recurrence->getBYSETPOSList()) {
            return $list;
        }
        $pos_list = $this->initDateList();
        $list->sort();
        $candidates = $list->get();
        $candidates_count = count($candidates);
        foreach ($this->recurrence->getBYSETPOSList() as $position) {
            if ($position > 0 and $date = $list->getAtPosition($position)) {
                $pos_list->add($date);
            }
            if ($position < 0 and $date = $list->getAtPosition($candidates_count + $position + 1)) {
                $pos_list->add($date);
            }
        }
        return $pos_list;
    }

References $list, initDateList(), and ilDateList\sort().

Referenced by calculateDateList().

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◆ applyBYWEEKNORules()

ilCalendarRecurrenceCalculator::applyBYWEEKNORules ( ilDateList $list )

protected

Apply BYWEEKNO rules (1 to 53 and -1 to -53).

This rule can only be applied to YEARLY rules (RFC 2445 4.3.10)

@access protected

Definition at line 358 of file class.ilCalendarRecurrenceCalculator.php.

    {
        if ($this->recurrence->getFrequenceType() != ilCalendarRecurrence::FREQ_YEARLY) {
            return $list;
        }
        // return unmodified, if no byweekno rules are available
        if (!$this->recurrence->getBYWEEKNOList()) {
            return $list;
        }
        $weeks_list = $this->initDateList();
        foreach ($list->get() as $seed) {
            $weeks_in_year = date('W', mktime(0, 0, 0, 12, 28, $seed->get(IL_CAL_FKT_DATE, 'Y', $this->timezone)));
            $this->log->write(__METHOD__ . ': Year ' . $seed->get(IL_CAL_FKT_DATE, 'Y', $this->timezone) . ' has ' . $weeks_in_year . ' weeks');
            foreach ($this->recurrence->getBYWEEKNOList() as $week_no) {
                $week_no = $week_no < 0 ? ($weeks_in_year + $week_no + 1) : $week_no;
                
                switch ($this->frequence_context) {
                    case ilCalendarRecurrence::FREQ_MONTHLY:
                        $this->log->write(__METHOD__ . ': Handling BYWEEKNO in MONTHLY context');
                        // Check if week matches
                        if ($seed->get(IL_CAL_FKT_DATE, 'W', $this->timezone) == $week_no) {
                            $weeks_list->add($seed);
                        }
                        break;
                        
                    case ilCalendarRecurrence::FREQ_YEARLY:
                        $this->log->write(__METHOD__ . ': Handling BYWEEKNO in YEARLY context');
                        $week_diff = $week_no - $seed->get(IL_CAL_FKT_DATE, 'W', $this->timezone);
                        
                        // TODO: think about tz here
                        $new_week = $this->createDate($seed->get(IL_CAL_UNIX, '', $this->timezone));
                        $new_week->increment(ilDateTime::WEEK, $week_diff);
                        $weeks_list->add($new_week);
                        break;
                }
            }
        }
        $this->frequence_context = ilCalendarRecurrence::FREQ_WEEKLY;
        
        return $weeks_list;
    }

References $list, createDate(), date, ilCalendarRecurrence\FREQ_MONTHLY, ilCalendarRecurrence\FREQ_WEEKLY, ilCalendarRecurrence\FREQ_YEARLY, ilDateList\get(), IL_CAL_FKT_DATE, IL_CAL_UNIX, initDateList(), and ilDateTime\WEEK.

Referenced by calculateDateList().

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◆ applyBYYEARDAYRules()

ilCalendarRecurrenceCalculator::applyBYYEARDAYRules ( ilDateList $list )

protected

Apply BYYEARDAY rules.

@access protected

Definition at line 405 of file class.ilCalendarRecurrenceCalculator.php.

    {
        // return unmodified, if no byweekno rules are available
        if (!$this->recurrence->getBYYEARDAYList()) {
            return $list;
        }
        $days_list = $this->initDateList();
        foreach ($list->get() as $seed) {
            $num_days = date('z', mktime(0, 0, 0, 12, 31, $seed->get(IL_CAL_FKT_DATE, 'Y', $this->timezone)));
            $this->log->write(__METHOD__ . ': Year ' . $seed->get(IL_CAL_FKT_DATE, 'Y', $this->timezone) . ' has ' . $num_days . ' days.');
            
            foreach ($this->recurrence->getBYYEARDAYList() as $day_no) {
                $day_no = $day_no < 0 ? ($num_days + $day_no + 1) : $day_no;
                
                $day_diff = $day_no - $seed->get(IL_CAL_FKT_DATE, 'z', $this->timezone);
                $new_day = $this->createDate($seed->get(IL_CAL_UNIX, '', $this->timezone));
                $new_day->increment(ilDateTime::DAY, $day_diff);
 
                switch ($this->frequence_context) {
                    case ilCalendarRecurrence::FREQ_DAILY:
                        // Check if day matches
                        if ($seed->get(IL_CAL_FKT_DATE, 'z', $this->timezone) == $day_no) {
                            $days_list->add($new_day);
                        }
                        break;
                    case ilCalendarRecurrence::FREQ_WEEKLY:
                        // Check if week matches
                        if ($seed->get(IL_CAL_FKT_DATE, 'W', $this->timezone) == $new_day->get(IL_CAL_FKT_DATE, 'W', $this->timezone)) {
                            $days_list->add($new_day);
                        }
                        break;
                    case ilCalendarRecurrence::FREQ_MONTHLY:
                        // Check if month matches
                        if ($seed->get(IL_CAL_FKT_DATE, 'n', $this->timezone) == $new_day->get(IL_CAL_FKT_DATE, 'n', $this->timezone)) {
                            $days_list->add($new_day);
                        }
                        break;
                    case ilCalendarRecurrence::FREQ_YEARLY:
                        // Simply add
                        $day_list->add($new_day);
                        break;
                }
            }
        }
        
        $this->frequence_context = ilCalendarRecurrence::FREQ_DAILY;
        return $days_list;
    }

References $list, createDate(), date, ilDateTime\DAY, ilCalendarRecurrence\FREQ_DAILY, ilCalendarRecurrence\FREQ_MONTHLY, ilCalendarRecurrence\FREQ_WEEKLY, ilCalendarRecurrence\FREQ_YEARLY, ilDateList\get(), IL_CAL_FKT_DATE, IL_CAL_UNIX, and initDateList().

Referenced by calculateDateList().

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◆ applyDurationPeriod()

ilCalendarRecurrenceCalculator::applyDurationPeriod	(	ilDateList	$list,
		ilDateTime	$start,
		ilDateTime	$end
	)

protected

Apply duration period.

Parameters

ilDateList $list

Definition at line 205 of file class.ilCalendarRecurrenceCalculator.php.

    {
        foreach ($list as $start_date) {
            $end_date = clone $start_date;
            $end_date->increment(ilDateTime::MINUTE, $this->getDuration() / 60);
            
            if (
                (
                    ilDateTime::_after($start_date, $this->period_end)
                ) ||
                (
                    ilDateTime::_before($end_date, $this->period_start)
                )
            ) {
                $this->log->debug('Removed invalid date ' . (string) $start_date . ' <-> ' . (string) $end_date);
                $list->remove($start_date);
            }
        }
    }

References $list, ilDateTime\_after(), ilDateTime\_before(), getDuration(), and ilDateTime\MINUTE.

Referenced by calculateDateList().

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◆ applyExclusionDates()

ilCalendarRecurrenceCalculator::applyExclusionDates ( )

protected

Parameters

ilDateList $list

Returns

Definition at line 805 of file class.ilCalendarRecurrenceCalculator.php.

    {
        if (!$this->recurrence->getExclusionDates()) {
            return true;
        }
        foreach ($this->recurrence->getExclusionDates() as $excl) {
            $this->valid_dates->removeByDAY($excl->getDate());
        }
    }

Referenced by calculateDateList().

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◆ applyLimits()

ilCalendarRecurrenceCalculator::applyLimits ( ilDateList $list )

protected

Apply limits (count or until)

@access protected

Parameters

object ilDateList

Definition at line 751 of file class.ilCalendarRecurrenceCalculator.php.

    {
        $list->sort();
 
        #echo "list: ";
        #echo $list;
        #echo '<br />';
 
        // Check valid dates before starting time
        foreach ($list->get() as $check_date) {
            if (ilDateTime::_before($check_date, $this->event->getStart(), IL_CAL_DAY)) {
                $this->log->debug('Removed invalid date: ' . (string) $check_date . ' before starting date:  ' . (string) $this->event->getStart());
                $list->remove($check_date);
            }
        }
        
        #echo 'Until date '.$this->recurrence->getFrequenceUntilDate();
 
        // Check count if given
        if ($this->recurrence->getFrequenceUntilCount()) {
            foreach ($list->get() as $res) {
                // check smaller than since the start time counts as one
                if (count($this->valid_dates->get()) < $this->recurrence->getFrequenceUntilCount()) {
                    $this->valid_dates->add($res);
                } else {
                    $this->limit_reached = true;
                    return false;
                }
            }
            return true;
        } elseif ($this->recurrence->getFrequenceUntilDate()) {
            #echo 'Until date '.$this->recurrence->getFrequenceUntilDate();
            $date = $this->recurrence->getFrequenceUntilDate();
            foreach ($list->get() as $res) {
                #echo 'Check date '.$res;
                if (ilDateTime::_after($res, $date, IL_CAL_DAY)) {
                    #echo 'Limit reached';
                    $this->limit_reached = true;
                    return false;
                }
                $this->valid_dates->add($res);
            }
            return true;
        }
 
        $this->valid_dates->merge($list);
        return true;
    }

References $list, $res, ilDateTime\_after(), ilDateTime\_before(), and IL_CAL_DAY.

Referenced by calculateDateList().

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◆ calculateDateList()

ilCalendarRecurrenceCalculator::calculateDateList	(	ilDateTime	$a_start,
		ilDateTime	$a_end,
			$a_limit = `-1`
	)

calculate date list

@access public

Parameters

object	ilDateTime start of period
object	ilDateTime end of period
int	limit number of returned dates

Returns: ilDateList ilDateList

Definition at line 105 of file class.ilCalendarRecurrenceCalculator.php.

    {
        #               echo $a_start;
        #               echo $a_end;
        #               echo $this->event->getStart();
        #               echo $this->event->getEnd();
 
 
        $this->valid_dates = $this->initDateList();
 
        // Check invalid settings: e.g no frequence given, invalid start/end dates ...
        if (!$this->validateRecurrence()) {
            $this->valid_dates->add($this->event->getStart());
            return $this->valid_dates;
        }
        
        // Performance fix: Switching the timezone for many dates seems to be
        // quite time consuming.
        // Therfore we adjust the timezone of all input dates (start,end, event start)
        // to the same tz (UTC for fullday events, Recurrence tz for all others).
        $this->adjustTimeZones($a_start, $a_end);
        
        
        
        // Add start of event if it is in the period
        if ((ilDateTime::_after($this->event->getStart(), $this->period_start, IL_CAL_DAY) and
            ilDateTime::_before($this->event->getStart(), $this->period_end, IL_CAL_DAY)) or
            ilDateTime::_equals($this->event->getStart(), $this->period_start, IL_CAL_DAY)) {
            // begin-patch aptar
            $this->valid_dates->add($this->event->getStart());
            #$this->valid_dates->add($this->event->getStart());
            // end patch aptar
        }
 
        // Calculate recurrences based on frequency (e.g. MONTHLY)
        $time = microtime(true);
 
        $start = $this->optimizeStartingTime();
        
        #echo "ZEIT: ADJUST: ".(microtime(true) - $time).'<br>';
        $counter = 0;
        do {
            ++$counter;
            // initialize context for applied rules
            // E.g
            // RRULE:FREQ=YEARLY;BYMONTH=1;BYWEEKNO=1,50        => context for BYWERKNO is monthly because it filters to the weeks in JAN
            // RRULE:FREQ=YEARLY;BYWEEKNO=1,50                          => context for BYWERKNO is yearly because it adds all weeks.
            $this->frequence_context = $this->recurrence->getFrequenceType();
            
            $freq_res = $this->initDateList();
            $freq_res->add($start);
            
            // Fixed sequence of applying rules (RFC 2445 4.3.10)
            $freq_res = $this->applyBYMONTHRules($freq_res);
            #echo "BYMONTH: ".$freq_res;
 
            $freq_res = $this->applyBYWEEKNORules($freq_res);
            #echo "BYWEEKNO: ".$freq_res;
 
            $freq_res = $this->applyBYYEARDAYRules($freq_res);
            #echo "BYYEARDAY: ".$freq_res;
 
 
            $freq_res = $this->applyBYMONTHDAYRules($freq_res);
            #echo "BYMONTHDAY: ".$freq_res;
 
            #$time = microtime(true);
            $freq_res = $this->applyBYDAYRules($freq_res);
            #echo "ZEIT: ".(microtime(true) - $time);
            #echo "BYDAY: ".$freq_res;
 
 
            $freq_res = $this->applyBYSETPOSRules($freq_res);
            #echo "BYSETPOS: ".$freq_res;
            
            $freq_res = $this->applyLimits($freq_res);
            #echo $freq_res;
 
            $start = $this->incrementByFrequency($start);
 
            if (ilDateTime::_after($start, $this->period_end) or $this->limit_reached) {
                break;
            }
        } while (true);
 
        $this->applyExclusionDates();
        
        $this->applyDurationPeriod($this->valid_dates, $this->period_start, $this->period_end);
 
        $this->valid_dates->sort();
            
        // Restore default timezone
        ilTimeZone::_restoreDefaultTimeZone();
        return $this->valid_dates;
    }

References $counter, $start, $time, $valid_dates, ilDateTime\_after(), ilDateTime\_before(), ilDateTime\_equals(), ilTimeZone\_restoreDefaultTimeZone(), adjustTimeZones(), applyBYDAYRules(), applyBYMONTHDAYRules(), applyBYMONTHRules(), applyBYSETPOSRules(), applyBYWEEKNORules(), applyBYYEARDAYRules(), applyDurationPeriod(), applyExclusionDates(), applyLimits(), IL_CAL_DAY, incrementByFrequency(), initDateList(), optimizeStartingTime(), and validateRecurrence().

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◆ calculateDateListByMonth()

ilCalendarRecurrenceCalculator::calculateDateListByMonth	(	$a_month,
		$a_year
	)

calculate day list by month(s) uses a cache of calculated recurring events @access public

Parameters

int	month
int	year

Returns: object ilDateList

Definition at line 91 of file class.ilCalendarRecurrenceCalculator.php.

92 {

93 }

◆ createDate()

ilCalendarRecurrenceCalculator::createDate	(	$a_date,
		$a_format_type = `IL_CAL_UNIX`
	)

protected

create date

@access protected

Definition at line 830 of file class.ilCalendarRecurrenceCalculator.php.

    {
        if ($this->event->isFullday()) {
            return new ilDate($a_date, $a_format_type);
        } else {
            // TODO: the timezone for this recurrence must be stored in the db
            return new ilDateTime($a_date, $a_format_type, $this->timezone);
        }
    }

Referenced by applyBYDAYRules(), applyBYMONTHDAYRules(), applyBYMONTHRules(), applyBYWEEKNORules(), applyBYYEARDAYRules(), and optimizeStartingTime().

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◆ getDuration()

ilCalendarRecurrenceCalculator::getDuration ( )

protected

Get duration of event.

Returns: type

Definition at line 78 of file class.ilCalendarRecurrenceCalculator.php.

    {
        return $this->duration;
    }

References $duration.

Referenced by applyDurationPeriod().

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◆ getMonthWeekDays()

ilCalendarRecurrenceCalculator::getMonthWeekDays	(	$year,
		$month
	)

protected

get a list of month days

@access protected

Parameters

return

Definition at line 671 of file class.ilCalendarRecurrenceCalculator.php.

    {
        static $month_days = array();
 
        if (isset($month_days[$year][$month])) {
            return $month_days[$year][$month];
        }
        
        $month_str = $month < 10 ? ('0' . $month) : $month;
        $begin_month = new ilDate($year . '-' . $month_str . '-01', IL_CAL_DATE);
        $begin_month_info = $begin_month->get(IL_CAL_FKT_GETDATE);
        
        $days = array(0 => 'SU',1 => 'MO',2 => 'TU',3 => 'WE',4 => 'TH',5 => 'FR',6 => 'SA');
        for ($i = 0;$i < $begin_month_info['wday'];$i++) {
            next($days);
        }
        for ($i = $begin_month_info['yday']; $i < $begin_month_info['yday'] + ilCalendarUtil::_getMaxDayOfMonth($year, $month) ; $i++) {
            if (($current_day = current($days)) == false) {
                $current_day = reset($days);
            }
            $month_days[$year][$month][$current_day][] = $i;
            next($days);
        }
        return $month_days[$year][$month];
    }

References $i, ilCalendarUtil\_getMaxDayOfMonth(), IL_CAL_DATE, and IL_CAL_FKT_GETDATE.

Referenced by applyBYDAYRules().

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◆ getWeekWeekDays()

ilCalendarRecurrenceCalculator::getWeekWeekDays ( $seed_info )

protected

get weedays of week

@access protected

Parameters

return

Definition at line 704 of file class.ilCalendarRecurrenceCalculator.php.

    {
        $days = array(0 => 'SU',1 => 'MO',2 => 'TU',3 => 'WE',4 => 'TH',5 => 'FR',6 => 'SA');
        
        $start_day = $seed_info['yday'] - $seed_info['wday'];
        foreach ($days as $num => $day) {
            $week_days[$day][] = $start_day++;
        }
        return $week_days;
    }

Referenced by applyBYDAYRules().

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◆ getYearWeekDays()

ilCalendarRecurrenceCalculator::getYearWeekDays ( ilDateTime $seed )

protected

get a list of year week days according to the BYMONTH rule

@access protected

Definition at line 639 of file class.ilCalendarRecurrenceCalculator.php.

    {
        $time = microtime(true);
        
        $year_days = array();
        
        $current_year = $seed->get(IL_CAL_FKT_DATE, 'Y');
        $start = new ilDate($current_year . '-01-01', IL_CAL_DATE);
        $offset = $start->get(IL_CAL_FKT_DATE, 'w');
        $days = array(0 => 'SU',1 => 'MO',2 => 'TU',3 => 'WE',4 => 'TH',5 => 'FR',6 => 'SA');
        for ($i = 0;$i < $offset;$i++) {
            next($days);
        }
        
        $num_days =  ilCalendarUtil::_isLeapYear($current_year) ? 366 : 365;
        for ($i = 0;$i < $num_days;$i++) {
            if (($current_day = current($days)) == false) {
                $current_day = reset($days);
            }
            $year_days[$current_day][] = $i;
            next($days);
        }
        return $year_days;
    }

References $i, $start, $time, ilCalendarUtil\_isLeapYear(), ilDateTime\get(), IL_CAL_DATE, and IL_CAL_FKT_DATE.

Referenced by applyBYDAYRules().

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◆ incrementByFrequency()

ilCalendarRecurrenceCalculator::incrementByFrequency ( $start )

protected

increment starting time by frequency

@access protected

Definition at line 285 of file class.ilCalendarRecurrenceCalculator.php.

    {
        global $ilLog;
 
        switch ($this->recurrence->getFrequenceType()) {
            case ilCalendarRecurrence::FREQ_YEARLY:
                $start->increment(ilDateTime::YEAR, $this->recurrence->getInterval());
                break;
            
            case ilCalendarRecurrence::FREQ_MONTHLY:
                $start->increment(ilDateTime::MONTH, $this->recurrence->getInterval());
                break;
 
            case ilCalendarRecurrence::FREQ_WEEKLY:
                $start->increment(ilDateTime::WEEK, $this->recurrence->getInterval());
                break;
            
            case ilCalendarRecurrence::FREQ_DAILY:
                $start->increment(ilDateTime::DAY, $this->recurrence->getInterval());
                break;
            
            default:
                $ilLog->write(__METHOD__ . 'No frequence defined.');
                break;
        }
        return $start;
    }

References $ilLog, $start, ilDateTime\DAY, ilCalendarRecurrence\FREQ_DAILY, ilCalendarRecurrence\FREQ_MONTHLY, ilCalendarRecurrence\FREQ_WEEKLY, ilCalendarRecurrence\FREQ_YEARLY, ilDateTime\MONTH, ilDateTime\WEEK, and ilDateTime\YEAR.

Referenced by calculateDateList(), and optimizeStartingTime().

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◆ initDateList()

ilCalendarRecurrenceCalculator::initDateList ( )

protected

init date list

@access protected

Definition at line 820 of file class.ilCalendarRecurrenceCalculator.php.

    {
        return new ilDateList($this->event->isFullday() ? ilDateList::TYPE_DATE : ilDateList::TYPE_DATETIME);
    }

References ilDateList\TYPE_DATE, and ilDateList\TYPE_DATETIME.

Referenced by applyBYDAYRules(), applyBYMONTHDAYRules(), applyBYMONTHRules(), applyBYSETPOSRules(), applyBYWEEKNORules(), applyBYYEARDAYRules(), and calculateDateList().

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◆ optimizeStartingTime()

ilCalendarRecurrenceCalculator::optimizeStartingTime ( )

protected

optimize starting time

@access protected

Definition at line 261 of file class.ilCalendarRecurrenceCalculator.php.

    {
        $time = microtime(true);
        
        // starting time cannot be optimzed if RRULE UNTIL is given.
        // In that case we have to calculate all dates until "UNTIL" is reached.
        if ($this->recurrence->getFrequenceUntilCount() > 0) {
            // Switch the date to the original defined timzone for this recurrence
            return $this->createDate($this->start->get(IL_CAL_UNIX, '', $this->timezone));
        }
        $optimized = $start = $this->createDate($this->start->get(IL_CAL_UNIX, '', $this->timezone));
        while (ilDateTime::_before($start, $this->period_start)) {
            $optimized = clone $start;
            $start = $this->incrementByFrequency($start);
        }
        
        return $optimized;
    }

References $start, $time, ilDateTime\_before(), createDate(), IL_CAL_UNIX, and incrementByFrequency().

Referenced by calculateDateList().

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◆ validateRecurrence()

ilCalendarRecurrenceCalculator::validateRecurrence ( )

protected

validate recurrence

@access protected

Returns: bool

Definition at line 846 of file class.ilCalendarRecurrenceCalculator.php.

    {
        return $this->recurrence->validate();
    }

Referenced by calculateDateList().

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Field Documentation

◆ $duration

ilCalendarRecurrenceCalculator::$duration = null

protected

Definition at line 53 of file class.ilCalendarRecurrenceCalculator.php.

Referenced by getDuration().

◆ $event

ilCalendarRecurrenceCalculator::$event = null

protected

Definition at line 52 of file class.ilCalendarRecurrenceCalculator.php.

◆ $frequence_context

ilCalendarRecurrenceCalculator::$frequence_context = 0

protected

Definition at line 56 of file class.ilCalendarRecurrenceCalculator.php.

◆ $limit_reached

ilCalendarRecurrenceCalculator::$limit_reached = false

protected

Definition at line 46 of file class.ilCalendarRecurrenceCalculator.php.

◆ $log

ilCalendarRecurrenceCalculator::$log = null

protected

Definition at line 44 of file class.ilCalendarRecurrenceCalculator.php.

◆ $period_end

ilCalendarRecurrenceCalculator::$period_end = null

protected

Definition at line 49 of file class.ilCalendarRecurrenceCalculator.php.

◆ $period_start

ilCalendarRecurrenceCalculator::$period_start = null

protected

Definition at line 48 of file class.ilCalendarRecurrenceCalculator.php.

◆ $recurrence

ilCalendarRecurrenceCalculator::$recurrence = null

protected

Definition at line 54 of file class.ilCalendarRecurrenceCalculator.php.

◆ $start

ilCalendarRecurrenceCalculator::$start = null

protected

Definition at line 50 of file class.ilCalendarRecurrenceCalculator.php.

Referenced by applyBYDAYRules(), calculateDateList(), getYearWeekDays(), incrementByFrequency(), and optimizeStartingTime().

◆ $timezone

ilCalendarRecurrenceCalculator::$timezone = null

protected

Definition at line 43 of file class.ilCalendarRecurrenceCalculator.php.

◆ $valid_dates

ilCalendarRecurrenceCalculator::$valid_dates = null

protected

Definition at line 47 of file class.ilCalendarRecurrenceCalculator.php.

Referenced by calculateDateList().

The documentation for this class was generated from the following file:

Services/Calendar/classes/class.ilCalendarRecurrenceCalculator.php

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ adjustTimeZones()

◆ applyBYDAYRules()

◆ applyBYMONTHDAYRules()

◆ applyBYMONTHRules()

◆ applyBYSETPOSRules()

◆ applyBYWEEKNORules()

◆ applyBYYEARDAYRules()

◆ applyDurationPeriod()

◆ applyExclusionDates()

◆ applyLimits()

◆ calculateDateList()

◆ calculateDateListByMonth()

◆ createDate()

◆ getDuration()

◆ getMonthWeekDays()

◆ getWeekWeekDays()

◆ getYearWeekDays()

◆ incrementByFrequency()

◆ initDateList()

◆ optimizeStartingTime()

◆ validateRecurrence()

Field Documentation

◆ $duration

◆ $event

◆ $frequence_context

◆ $limit_reached

◆ $log

◆ $period_end

◆ $period_start

◆ $recurrence

◆ $start

◆ $timezone

◆ $valid_dates