includes/externalstore/ExternalStoreMedium.php

   1 <?php
   2 /**
   3  * External storage in some particular medium.
   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 ExternalStorage
  22  * @author Aaron Schulz
  23  */
  24
  25 /**
  26  * Accessable external objects in a particular storage medium
  27  *
  28  * @ingroup ExternalStorage
  29  * @since 1.21
  30  */
  31 abstract class ExternalStoreMedium {
  32         /** @var array */
  33         protected $params = array();
  34
  35         /**
  36          * @param array $params Options
  37          */
  38         public function __construct( array $params = array() ) {
  39                 $this->params = $params;
  40         }
  41
  42         /**
  43          * Fetch data from given external store URL
  44          *
  45          * @param string $url An external store URL
  46          * @return string|bool The text stored or false on error
  47          * @throws MWException
  48          */
  49         abstract public function fetchFromURL( $url );
  50
  51         /**
  52          * Fetch data from given external store URLs.
  53          *
  54          * @param array $urls A list of external store URLs
  55          * @return array Map from the url to the text stored. Unfound data is not represented
  56          */
  57         public function batchFetchFromURLs( array $urls ) {
  58                 $retval = array();
  59                 foreach ( $urls as $url ) {
  60                         $data = $this->fetchFromURL( $url );
  61                         // Dont return when false to allow for simpler implementations.
  62                         // errored urls are handled in ExternalStore::batchFetchFromURLs
  63                         if ( $data !== false ) {
  64                                 $retval[$url] = $data;
  65                         }
  66                 }
  67
  68                 return $retval;
  69         }
  70
  71         /**
  72          * Insert a data item into a given location
  73          *
  74          * @param string $location The location name
  75          * @param string $data The data item
  76          * @return string|bool The URL of the stored data item, or false on error
  77          * @throws MWException
  78          */
  79         abstract public function store( $location, $data );
  80 }