Navigation.php

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<?php
namespace Magento\Setup\Model;

use Zend\ServiceManager\ServiceLocatorInterface;
use Magento\Framework\App\DeploymentConfig;

class Navigation
{
    const NAV_INSTALLER = 'navInstaller';
    const NAV_UPDATER = 'navUpdater';
    private $navStates;

    private $navType;

    private $titles;

    public function __construct(ServiceLocatorInterface $serviceLocator, DeploymentConfig $deploymentConfig)
    {
        if ($deploymentConfig->isAvailable()) {
            $this->navStates = $serviceLocator->get('config')[self::NAV_UPDATER];
            $this->navType = self::NAV_UPDATER;
            $this->titles = $serviceLocator->get('config')[self::NAV_UPDATER . 'Titles'];
        } else {
            $this->navStates = $serviceLocator->get('config')[self::NAV_INSTALLER];
            $this->navType = self::NAV_INSTALLER;
            $this->titles = $serviceLocator->get('config')[self::NAV_INSTALLER . 'Titles'];
        }
    }

    public function getType()
    {
        return $this->navType;
    }

    public function getData()
    {
        return $this->navStates;
    }

    public function getMenuItems()
    {
        return array_values(array_filter(
            $this->navStates,
            function ($value) {
                return isset($value['nav']) && (bool)$value['nav'];
            }
        ));
    }

    public function getMainItems()
    {
        $result = array_values(array_filter(
            $this->navStates,
            function ($value) {
                return isset($value['main']) && (bool)$value['main'];
            }
        ));
        return $result;
    }

    public function getTitles()
    {
        return $this->titles;
    }
}