protected function setModifiers($modifiers)
    {
        if (is_array($modifiers) === true) {
            $modifiersArray = $modifiers;
            $modifiers = Modifiers::MODIFIER_NONE;
            foreach ($modifiersArray as $modifier) {
                $modifiers |= $modifier;
            }
        }

        $this->modifiers = $modifiers;
    }