AbstractMethod.php

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<?php
namespace Magento\Dhl\Model\Source\Method;

abstract class AbstractMethod extends \Magento\Dhl\Model\Source\Method\Generic
{
    protected $_contentType;

    protected $_noneMethod = false;

    public function toOptionArray()
    {
        /* @var $carrierModel \Magento\Dhl\Model\Carrier */
        $carrierModel = $this->_shippingDhl;
        $dhlProducts = $carrierModel->getDhlProducts($this->_contentType);

        $options = [];
        foreach ($dhlProducts as $code => $title) {
            $options[] = ['value' => $code, 'label' => $title];
        }

        if ($this->_noneMethod) {
            array_unshift($options, ['value' => '', 'label' => __('None')]);
        }

        return $options;
    }
}