/**
* Returns an instance of Oray_Db_Helper
*
* Singleton pattern implementation
*
* @return Oray_Db_Helper Provides a fluent interface
*/
public static function getInstance()
{
if (null === self::$_instance) {
self::$_instance = new self();
}
return self::$_instance;
}
/**
* @param mixed $db Either an Adapter object, or a string naming a Registry key
* @return Zend_Db_Adapter_Abstract
* @throws Oray_Dao_Exception
*/
protected static function _setupAdapter($db)
{
if ($db === null) {
return null;
}
if (is_string($db)) {
require_once 'Oray/Db/Helper.php';
$db = Oray_Db_Helper::get($db);
}
if (!$db instanceof Zend_Db_Adapter_Abstract) {
require_once 'Oray/Dao/Exception.php';
throw new Oray_Dao_Exception('Argument must be of type Zend_Db_Adapter_Abstract, or a Registry key where a Oray_Db_Helper object is stored');
}
return $db;
}
