ptalk-8.x-0.x-dev/src/Plugin/Menu/PtalkCollectionMenuLink.php

<?php

namespace Drupal\ptalk\Plugin\Menu;

use Drupal\Core\Menu\MenuLinkDefault;
use Drupal\Core\Menu\StaticMenuLinkOverridesInterface;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\Cache\Cache;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * A menu link that leads to the private convesations.
 */
class PtalkCollectionMenuLink extends MenuLinkDefault {

  /**
   * The current user.
   *
   * @var \Drupal\Core\Session\AccountInterface
   */
  protected $currentUser;

  /**
   * Constructs a new PtalkCollectionMenuLink.
   *
   * @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.
   * @param \Drupal\Core\Session\AccountInterface $current_user
   *   The current user.
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition, StaticMenuLinkOverridesInterface $static_override, AccountInterface $current_user) {
    parent::__construct($configuration, $plugin_id, $plugin_definition, $static_override);
    $this->currentUser = $current_user;
  }

  /**
   * {@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'),
      $container->get('current_user')
    );
  }

  /**
   * {@inheritdoc}
   */
  public function getTitle() {
    if ($this->currentUser->hasPermission('read private conversation')) {
      $count = \Drupal::entityTypeManager()->getStorage('ptalk_thread')->countUnread($this->currentUser);
      if ($count) {
        return t('Private conversations (@count)', ['@count' => $count]);
      }
      else {
        return t('Private conversations');
      }
    }
  }

  /**
   * {@inheritdoc}
   */
  public function getRouteName() {
    return 'entity.ptalk_thread.collection';
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheTags() {
    $tags = parent::getCacheTags();
    return Cache::mergeTags(array('ptalk_participant:' . $this->currentUser->id()), $tags);
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheContexts() {
    $contexts = parent::getCacheContexts();
    return array_merge($contexts, array('user'));
  }

}