componentscollection.php

<?php
 
 
namespace Bitrix\Calendar\ICal\Parser;
 
 
use ArrayIterator;
use IteratorAggregate;
use LogicException;
 
class ComponentsCollection implements IteratorAggregate
{
    private $collection;
 
    public static function createInstance(array $collection = null): ComponentsCollection
    {
        return new self($collection);
    }
 
    public function __construct(array $collection = null)
    {
        if (!$this->checkCollection($collection))
        {
            throw new LogicException('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 getIterator(): ArrayIterator
    {
        return new ArrayIterator($this->collection);
    }
 
    public function add(?ParserComponent $component): ComponentsCollection
    {
        if ($component === null)
        {
            return $this;
        }
 
        $this->collection[] = $component;
 
        return $this;
    }
 
    public function count(): int
    {
        return count($this->collection);
    }
 
    public function hasOneComponent(): bool
    {
        return $this->count() === 1;
    }
 
    public function hasOneCalendarComponent(): bool
    {
        return $this->hasOneComponent() && ($this->collection[0] instanceof Calendar);
    }
 
    private function checkCollection(?array $collection): bool
    {
        if ($collection === null)
        {
            return true;
        }
 
        $attendee = array_filter($collection, function ($attendee) {
            return !($attendee instanceof ParserComponent);
        });
 
        return empty($attendee);
    }
}