DataFactory.php

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<?php
namespace Magento\Authorizenet\Helper;

use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\ObjectManagerInterface;

class DataFactory
{
    const AREA_FRONTEND = 'frontend';
    const AREA_BACKEND = 'adminhtml';

    protected $objectManager;

    protected $helperMap = [
        self::AREA_FRONTEND => \Magento\Authorizenet\Helper\Data::class,
        self::AREA_BACKEND => \Magento\Authorizenet\Helper\Backend\Data::class
    ];

    public function __construct(ObjectManagerInterface $objectManager)
    {
        $this->objectManager = $objectManager;
    }

    public function create($area)
    {
        if (!isset($this->helperMap[$area])) {
            throw new LocalizedException(__(sprintf('For this area <%s> no suitable helper', $area)));
        }

        return $this->objectManager->get($this->helperMap[$area]);
    }
}