interface ParamConverterInterface

ParamConverterManager.php in drupal/core/lib/Drupal/Core/ParamConverter/ParamConverterManager.php

Contains Drupal\Core\ParamConverter\ParamConverterManager.

ViewUIConverter.php in drupal/core/modules/views_ui/lib/Drupal/views_ui/ParamConverter/ViewUIConverter.php

Contains \Drupal\views_ui\ParamConverter\ViewUIConverter.

interface ParamConverterInterface {

  /**
   * Allows to convert variables to their corresponding objects.
   *
   * @param array &$variables
   *   Array of values to convert to their corresponding objects, if applicable.
   * @param \Symfony\Component\Routing\Route $route
   *   The route object.
   * @param array &$converted
   *   Array collecting the names of all variables which have been
   *   altered by a converter.
   */
  public function process(array &$variables, Route $route, array &$converted);

}