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<?php
/**
* External storage in some particular medium.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup ExternalStorage
* @author Aaron Schulz
*/
/**
* Accessable external objects in a particular storage medium
*
* @ingroup ExternalStorage
* @since 1.21
*/
abstract class ExternalStoreMedium {
/** @var array */
protected $params = array();
/**
* @param array $params Options
*/
public function __construct( array $params = array() ) {
$this->params = $params;
}
/**
* Fetch data from given external store URL
*
* @param string $url An external store URL
* @return string|bool The text stored or false on error
* @throws MWException
*/
abstract public function fetchFromURL( $url );
/**
* Fetch data from given external store URLs.
*
* @param array $urls A list of external store URLs
* @return array Map from the url to the text stored. Unfound data is not represented
*/
public function batchFetchFromURLs( array $urls ) {
$retval = array();
foreach ( $urls as $url ) {
$data = $this->fetchFromURL( $url );
// Dont return when false to allow for simpler implementations.
// errored urls are handled in ExternalStore::batchFetchFromURLs
if ( $data !== false ) {
$retval[$url] = $data;
}
}
return $retval;
}
/**
* Insert a data item into a given location
*
* @param string $location The location name
* @param string $data The data item
* @return string|bool The URL of the stored data item, or false on error
* @throws MWException
*/
abstract public function store( $location, $data );
}
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