/**
* Returns a reference to a Format object, only creating it
* if it doesn't already exist.
*
* @param string The format to load
* @return object Registry format handler
* @throws RokCommon_Loader_Exception
* @since 1.5
*/
public static function getInstance($type)
{
// Initialize static variable.
if (!isset(self::$instances)) {
self::$instances = array();
}
// Sanitize format type.
$type = strtoupper(preg_replace('/[^A-Z0-9_]/i', '', $type));
// Only instantiate the object if it doesn't already exist.
if (!isset(self::$instances[$type])) {
// Only load the file the class does not exist.
$class = 'RokCommon_Registry_Format_' . $type;
if (!class_exists($class)) {
throw new RokCommon_Loader_Exception('Unable to find Registry format ' . $type);
}
self::$instances[$type] = new $class();
}
return self::$instances[$type];
}
