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<?php
/**
*
* @package MediaWiki
*
* Constructor class for data kept in external repositories
*
* External repositories might be populated by maintenance/async
* scripts, thus partial moving of data may be possible, as well
* as possibility to have any storage format (i.e. for archives)
*
*/
class ExternalStore {
/* Fetch data from given URL */
function fetchFromURL($url) {
global $wgExternalStores;
if (!$wgExternalStores)
return false;
@list($proto,$path)=explode('://',$url,2);
/* Bad URL */
if ($path=="")
return false;
$store =& ExternalStore::getStoreObject( $proto );
if ( $store === false )
return false;
return $store->fetchFromURL($url);
}
/**
* Get an external store object of the given type
*/
function &getStoreObject( $proto ) {
global $wgExternalStores;
if (!$wgExternalStores)
return false;
/* Protocol not enabled */
if (!in_array( $proto, $wgExternalStores ))
return false;
$class='ExternalStore'.ucfirst($proto);
/* Preloaded modules might exist, especially ones serving multiple protocols */
if (!class_exists($class)) {
if (!include_once($class.'.php'))
return false;
}
$store=new $class();
return $store;
}
/**
* Store a data item to an external store, identified by a partial URL
* The protocol part is used to identify the class, the rest is passed to the
* class itself as a parameter.
* Returns the URL of the stored data item, or false on error
*/
function insert( $url, $data ) {
list( $proto, $params ) = explode( '://', $url, 2 );
$store =& ExternalStore::getStoreObject( $proto );
if ( $store === false ) {
return false;
} else {
return $store->store( $params, $data );
}
}
}
?>
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