attendeescollection.php

<?php
 
 
namespace Bitrix\Calendar\ICal\Builder;
 
 
use Bitrix\Calendar\SerializeObject;
use ArrayIterator;
use IteratorAggregate;
use Serializable;
 
class AttendeesCollection implements IteratorAggregate, Serializable
{
    use SerializeObject;
    private array $collection;
 
    public static function createInstance(array $collection = []): AttendeesCollection
    {
        return new self($collection);
    }
 
 
    public function __construct(array $collection = [])
    {
        if (!$this->checkCollection($collection))
        {
            throw new \InvalidArgumentException('The collection contains elements of the wrong class. You need to pass a collection of objects Bitrix\\Calendar\\ICal\\Builder\\Attendee');
        }
 
        $this->collection = $collection;
    }
 
    public function __toString(): string
    {
        if (empty($this->collection))
        {
            return '';
        }
 
        $result = [];
        foreach ($this->collection as $attendee)
        {
            if (!empty($attendee->getFullName()))
            {
                $result[] = $attendee->getFullName();
            }
        }
 
        return implode(', ', $result);
    }
 
    public function add(Attendee $attendee): AttendeesCollection
    {
        $this->collection[] = $attendee;
 
        return $this;
    }
 
    public function getIterator(): ArrayIterator
    {
        return new ArrayIterator($this->collection);
    }
 
    public function getCount(): int
    {
        return count($this->collection);
    }
 
    private function checkCollection(?array $collection): bool
    {
        if (is_null($collection))
        {
            return true;
        }
 
        $attendee = array_filter($collection, static function ($attendee) {
            return !($attendee instanceof Attendee);
        });
 
        return empty($attendee);
    }
}