Statistics.php

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<?php
namespace Magento\Reports\Controller\Adminhtml\Report;

use Magento\Backend\Model\Auth\Session as AuthSession;
use Magento\Backend\Model\Session;

abstract class Statistics extends \Magento\Backend\App\Action
{
    const ADMIN_RESOURCE = 'Magento_Reports::statistics';

    protected $_adminSession = null;

    protected $_dateFilter;

    protected $reportTypes;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\Stdlib\DateTime\Filter\Date $dateFilter,
        array $reportTypes
    ) {
        $this->_dateFilter = $dateFilter;
        $this->reportTypes = $reportTypes;
        parent::__construct($context);
    }

    public function _initAction()
    {
        $this->_view->loadLayout();
        $this->_addBreadcrumb(__('Reports'), __('Reports'));
        $this->_addBreadcrumb(__('Statistics'), __('Statistics'));
        return $this;
    }

    protected function _getCollectionNames()
    {
        $codes = $this->getRequest()->getParam('code');
        if (!$codes) {
            throw new \Exception(__('No report code is specified.'));
        }

        if (!is_array($codes) && strpos($codes, ',') === false) {
            $codes = [$codes];
        } elseif (!is_array($codes)) {
            $codes = explode(',', $codes);
        }

        $out = [];
        foreach ($codes as $code) {
            $out[] = $this->reportTypes[$code];
        }
        return $out;
    }

    protected function _getSession()
    {
        if ($this->_adminSession === null) {
            $this->_adminSession = $this->_objectManager->get(\Magento\Backend\Model\Auth\Session::class);
        }
        return $this->_adminSession;
    }
}