Result.php

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<?php
namespace Magento\Shipping\Model\Tracking;

use Magento\Shipping\Model\Rate\Result as RateResult;
use Magento\Shipping\Model\Tracking\Result\AbstractResult;

class Result
{
    protected $_trackings = [];

    protected $_error = null;

    public function reset()
    {
        $this->_trackings = [];
        return $this;
    }

    public function setError($error)
    {
        $this->_error = $error;
    }

    public function getError()
    {
        return $this->_error;
    }

    public function append($result)
    {
        if ($result instanceof AbstractResult) {
            $this->_trackings[] = $result;
        } elseif ($result instanceof RateResult) {
            $trackings = $result->getAllTrackings();
            foreach ($trackings as $track) {
                $this->append($track);
            }
        }
        return $this;
    }

    public function getAllTrackings()
    {
        return $this->_trackings;
    }
}