Menu.php

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<?php
namespace TYPO3\CMS\Backend\Template\Components\Menu;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use TYPO3\CMS\Core\Utility\GeneralUtility;

class Menu
{
    protected $identifier = '';

    protected $label = '';

    protected $menuItems = [];

    public function getLabel()
    {
        return $this->label;
    }

    public function setLabel($label)
    {
        $this->label = $label;
        return $this;
    }

    public function setIdentifier($identifier)
    {
        $this->identifier = $identifier;
        return $this;
    }

    public function addMenuItem(MenuItem $menuItem)
    {
        if (!$menuItem->isValid($menuItem)) {
            throw new \InvalidArgumentException('MenuItem "' . $menuItem->getTitle() . '" is not valid', 1442236317);
        }
        // @todo implement sorting of menu items
        // @todo maybe even things like spacers/sections?
        $this->menuItems[] = clone $menuItem;
    }

    public function getMenuItems()
    {
        return $this->menuItems;
    }

    public function getIdentifier()
    {
        return $this->identifier;
    }

    public function getDataIdentifier(): string
    {
        $dataMenuIdentifier = GeneralUtility::camelCaseToLowerCaseUnderscored($this->identifier);
        $dataMenuIdentifier = str_replace('_', '-', $dataMenuIdentifier);
        return $dataMenuIdentifier;
    }

    public function makeMenuItem()
    {
        $menuItem = GeneralUtility::makeInstance(MenuItem::class);
        return $menuItem;
    }

    public function isValid(Menu $menu)
    {
        return trim($menu->getIdentifier()) !== '';
    }
}