AbstractSimpleObject.php

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<?php
namespace Magento\Framework\Api;

abstract class AbstractSimpleObject
{
    protected $_data;

    public function __construct(array $data = [])
    {
        $this->_data = $data;
    }

    protected function _get($key)
    {
        return $this->_data[$key] ?? null;
    }

    public function setData($key, $value)
    {
        $this->_data[$key] = $value;
        return $this;
    }

    public function __toArray()
    {
        $data = $this->_data;
        $hasToArray = function ($model) {
            return is_object($model) && method_exists($model, '__toArray') && is_callable([$model, '__toArray']);
        };
        foreach ($data as $key => $value) {
            if ($hasToArray($value)) {
                $data[$key] = $value->__toArray();
            } elseif (is_array($value)) {
                foreach ($value as $nestedKey => $nestedValue) {
                    if ($hasToArray($nestedValue)) {
                        $value[$nestedKey] = $nestedValue->__toArray();
                    }
                }
                $data[$key] = $value;
            }
        }
        return $data;
    }
}