Acl\Controller\Component\AclComponent::adapter PHP Method

    public function adapter($adapter = null)
    {
        if ($adapter) {
            if (is_string($adapter)) {
                $adapter = new $adapter();
            }
            if (!$adapter instanceof AclInterface) {
                throw new Exception('AclComponent adapters must implement AclInterface');
            }
            $this->_Instance = $adapter;
            $this->_Instance->initialize($this);
            return;
        }
        return $this->_Instance;
    }