trait DependencyHelperTrait in Dependency Calculation 8

trait DependencyHelperTrait {

  /**
   * Calculates all the dependencies of a given entity.
   *
   * @var \Drupal\depcalc\DependencyCalculator
   */
  protected $calculator;

  /**
   * Returns the list of entity dependencies.
   *
   * @param \Drupal\Core\Entity\EntityInterface $entity
   *   The entity.
   *
   * @return array
   *   The list of UUIDs of dependencies (entities).
   *
   * @throws \Exception
   */
  protected function getEntityDependencies(EntityInterface $entity) {
    $wrapper = $this
      ->getDependentEntityWrapper($entity);
    return array_keys($wrapper
      ->getDependencies());
  }

  /**
   * Returns the list of module dependencies.
   *
   * @param \Drupal\Core\Entity\EntityInterface $entity
   *   The entity object.
   *
   * @return array
   *   The list of UUIDs of entity dependencies.
   *
   * @throws \Exception
   */
  protected function getModuleDependencies(EntityInterface $entity) {
    $wrapper = $this
      ->getDependentEntityWrapper($entity);
    return $wrapper
      ->getModuleDependencies();
  }

  /**
   * Calculate entity dependencies and return the DependentEntityWrapper object.
   *
   * @param \Drupal\Core\Entity\EntityInterface $entity
   *   The entity object.
   *
   * @return \Drupal\depcalc\DependentEntityWrapperInterface|null
   *   The DependentEntityWrapper object.
   *
   * @throws \Exception
   */
  protected function getDependentEntityWrapper(EntityInterface $entity) : ?DependentEntityWrapperInterface {
    $dependentEntityWrapper = new DependentEntityWrapper($entity);
    $stack = new DependencyStack();
    $this->calculator
      ->calculateDependencies($dependentEntityWrapper, $stack);
    return $stack
      ->getDependency($entity
      ->uuid());
  }

}