includes/media/MediaHandlerFactory.php

   1 <?php
   2 /**
   3  * Media-handling base classes and generic functionality.
   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 along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Media
  22  */
  23
  24 /**
  25  * Class to construct MediaHandler objects
  26  *
  27  * @since 1.28
  28  */
  29 class MediaHandlerFactory {
  30
  31         /**
  32          * @var MediaHandler[]
  33          */
  34         private $handlers;
  35
  36         protected function getHandlerClass( $type ) {
  37                 global $wgMediaHandlers;
  38                 if ( isset( $wgMediaHandlers[$type] ) ) {
  39                         return $wgMediaHandlers[$type];
  40                 } else {
  41                         return false;
  42                 }
  43         }
  44
  45         /**
  46          * @param string $type mimetype
  47          * @return bool|MediaHandler
  48          */
  49         public function getHandler( $type ) {
  50                 if ( isset( $this->handlers[$type] ) ) {
  51                         return $this->handlers[$type];
  52                 }
  53
  54                 $class = $this->getHandlerClass( $type );
  55                 if ( $class !== false ) {
  56                         /** @var MediaHandler $handler */
  57                         $handler = new $class;
  58                         if ( !$handler->isEnabled() ) {
  59                                 wfDebug( __METHOD__ . ": $class is not enabled\n" );
  60                                 $handler = false;
  61                         }
  62                 } else {
  63                         wfDebug( __METHOD__ . ": no handler found for $type.\n" );
  64                         $handler = false;
  65                 }
  66
  67                 $this->handlers[$type] = $handler;
  68                 return $handler;
  69         }
  70 }