/**
* Return an array all the Provider objects supplied by extensions,
* optionally filtered by a given `$type`.
*
* @since Symphony 2.3
* @todo Add information about the possible types
* @param string $type
* This will only return Providers of this type. If null, which is
* default, all providers will be returned.
* @return array
* An array of objects
*/
public static function getProvidersOf($type = null)
{
// Loop over all extensions and build an array of providable objects
if (empty(self::$_providers)) {
self::$_providers = array();
foreach (self::listInstalledHandles() as $handle) {
$obj = self::getInstance($handle);
if (!method_exists($obj, 'providerOf')) {
continue;
}
$providers = $obj->providerOf();
if (empty($providers)) {
continue;
}
// For each of the matching objects (by $type), resolve the object path
self::$_providers = array_merge_recursive(self::$_providers, $obj->providerOf());
}
}
// Return an array of objects
if (is_null($type)) {
return self::$_providers;
}
if (!isset(self::$_providers[$type])) {
return array();
}
return self::$_providers[$type];
}
