MenuLinkDefault.php

<?php

namespace Drupal\Core\Menu;

use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides a default implementation for menu link plugins.
 */
class MenuLinkDefault extends MenuLinkBase implements ContainerFactoryPluginInterface {
    
    /**
     * {@inheritdoc}
     */
    protected $overrideAllowed = [
        'menu_name' => 1,
        'parent' => 1,
        'weight' => 1,
        'expanded' => 1,
        'enabled' => 1,
    ];
    
    /**
     * The static menu link service used to store updates to weight/parent etc.
     *
     * @var \Drupal\Core\Menu\StaticMenuLinkOverridesInterface
     */
    protected $staticOverride;
    
    /**
     * Constructs a new MenuLinkDefault.
     *
     * @param array $configuration
     *   A configuration array containing information about the plugin instance.
     * @param string $plugin_id
     *   The plugin_id for the plugin instance.
     * @param mixed $plugin_definition
     *   The plugin implementation definition.
     * @param \Drupal\Core\Menu\StaticMenuLinkOverridesInterface $static_override
     *   The static override storage.
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition, StaticMenuLinkOverridesInterface $static_override) {
        parent::__construct($configuration, $plugin_id, $plugin_definition);
        $this->staticOverride = $static_override;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
        return new static($configuration, $plugin_id, $plugin_definition, $container->get('menu_link.static.overrides'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getTitle() {
        return (string) $this->pluginDefinition['title'];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDescription() {
        return (string) $this->pluginDefinition['description'];
    }
    
    /**
     * {@inheritdoc}
     */
    public function isResettable() {
        // The link can be reset if it has an override.
        return (bool) $this->staticOverride
            ->loadOverride($this->getPluginId());
    }
    
    /**
     * {@inheritdoc}
     */
    public function updateLink(array $new_definition_values, $persist) {
        // Filter the list of updates to only those that are allowed.
        $overrides = array_intersect_key($new_definition_values, $this->overrideAllowed);
        // Update the definition.
        $this->pluginDefinition = $overrides + $this->getPluginDefinition();
        if ($persist) {
            // Always save the menu name as an override to avoid defaulting to tools.
            $overrides['menu_name'] = $this->pluginDefinition['menu_name'];
            $this->staticOverride
                ->saveOverride($this->getPluginId(), $this->pluginDefinition);
        }
        return $this->pluginDefinition;
    }

}