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   1  <?php
   2  /**
   3   * Base classes for actions done on pages.
   4   *
   5   * This program is free software; you can redistribute it and/or modify
   6   * it under the terms of the GNU General Public License as published by
   7   * the Free Software Foundation; either version 2 of the License, or
   8   * (at your option) any later version.
   9   *
  10   * This program is distributed in the hope that it will be useful,
  11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13   * GNU General Public License for more details.
  14   *
  15   * You should have received a copy of the GNU General Public License
  16   * along with this program; if not, write to the Free Software
  17   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
  18   *
  19   * @file
  20   * @ingroup Actions
  21   */
  22  
  23  /**
  24   * An action which just does something, without showing a form first.
  25   *
  26   * @ingroup Actions
  27   */
  28  abstract class FormlessAction extends Action {
  29  
  30      /**
  31       * Show something on GET request.
  32       * @return string|null Will be added to the HTMLForm if present, or just added to the
  33       *     output if not.  Return null to not add anything
  34       */
  35      abstract public function onView();
  36  
  37  	public function show() {
  38          $this->setHeaders();
  39  
  40          // This will throw exceptions if there's a problem
  41          $this->checkCanExecute( $this->getUser() );
  42  
  43          $this->getOutput()->addHTML( $this->onView() );
  44      }
  45  }