<?php
  
  /*
   * This file is part of the Symfony package.
   *
   * (c) Fabien Potencier <fabien@symfony.com>
   *
   * For the full copyright and license information, please view the LICENSE
   * file that was distributed with this source code.
   */
  
  namespace Symfony\Component\Console\Helper;
  
  /**
   * HelperInterface is the interface all helpers must implement.
   *
   * @author Fabien Potencier <fabien@symfony.com>
   *
   * @api
   */
  interface HelperInterface
  {
      /**
       * Sets the helper set associated with this helper.
       *
       * @param HelperSet $helperSet A HelperSet instance
       *
       * @api
       */
      public function setHelperSet(HelperSet $helperSet = null);
  
      /**
       * Gets the helper set associated with this helper.
       *
       * @return HelperSet A HelperSet instance
       *
       * @api
       */
      public function getHelperSet();
  
      /**
       * Returns the canonical name of this helper.
       *
       * @return string The canonical name
       *
       * @api
       */
      public function getName();
  }