NestedAttribute.php

<?php
 
declare(strict_types=1);
 
namespace Commercetools\Api\Models\Product;
 
use Commercetools\Base\MapperSequence;
use Commercetools\Exception\InvalidArgumentException;
use stdClass;
 
class NestedAttribute extends MapperSequence
{
    public function add($value)
    {
        if (!$value instanceof Attribute) {
            throw new InvalidArgumentException();
        }
        $this->store($value);
 
        return $this;
    }
 
    protected function mapper()
    {
        return function (int $index): ?Attribute {
            $data = $this->get($index);
            if ($data instanceof Attribute || $data == null) {
                return $data;
            }
            $data = AttributeModel::of($data);
            $this->set($data, $index);
 
            return $data;
        };
    }
}