Available.php

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<?php

namespace Sabre\VObject\Component;

use Sabre\VObject;

class Available extends VObject\Component {

    function getEffectiveStartEnd() {

        $effectiveStart = $this->DTSTART->getDateTime();
        if (isset($this->DTEND)) {
            $effectiveEnd = $this->DTEND->getDateTime();
        } else {
            $effectiveEnd = $effectiveStart->add(VObject\DateTimeParser::parseDuration($this->DURATION));
        }

        return [$effectiveStart, $effectiveEnd];

    }

    function getValidationRules() {

        return [
            'UID'     => 1,
            'DTSTART' => 1,
            'DTSTAMP' => 1,

            'DTEND'    => '?',
            'DURATION' => '?',

            'CREATED'       => '?',
            'DESCRIPTION'   => '?',
            'LAST-MODIFIED' => '?',
            'RECURRENCE-ID' => '?',
            'RRULE'         => '?',
            'SUMMARY'       => '?',

            'CATEGORIES' => '*',
            'COMMENT'    => '*',
            'CONTACT'    => '*',
            'EXDATE'     => '*',
            'RDATE'      => '*',

            'AVAILABLE' => '*',
        ];

    }

    function validate($options = 0) {

        $result = parent::validate($options);

        if (isset($this->DTEND) && isset($this->DURATION)) {
            $result[] = [
                'level'   => 3,
                'message' => 'DTEND and DURATION cannot both be present',
                'node'    => $this
            ];
        }

        return $result;

    }
}