AbstractAction.php

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<?php
namespace Magento\Braintree\Controller\Paypal;

use Magento\Checkout\Model\Session;
use Magento\Framework\App\Action\Action;
use Magento\Framework\App\Action\Context;
use Magento\Quote\Api\Data\CartInterface;
use Magento\Framework\App\RequestInterface;
use Magento\Framework\Controller\Result\Redirect;
use Magento\Braintree\Gateway\Config\PayPal\Config;

abstract class AbstractAction extends Action
{
    protected $config;

    protected $checkoutSession;

    public function __construct(
        Context $context,
        Config $config,
        Session $checkoutSession
    ) {
        parent::__construct($context);
        $this->config = $config;
        $this->checkoutSession = $checkoutSession;
    }

    public function dispatch(RequestInterface $request)
    {
        if (!$this->config->isActive() || !$this->config->isDisplayShoppingCart()) {
            $this->_actionFlag->set('', self::FLAG_NO_DISPATCH, true);

            $resultRedirect = $this->resultRedirectFactory->create();
            $resultRedirect->setPath('noRoute');

            return $resultRedirect;
        }

        return parent::dispatch($request);
    }

    protected function validateQuote($quote)
    {
        if (!$quote || !$quote->getItemsCount()) {
            throw new \InvalidArgumentException(__('Checkout failed to initialize. Verify and try again.'));
        }
    }
}