private function initialize()
    {
        $params = $this->getParameters();
        if ($params !== null) {
            foreach ($params as $param) {
                if (self::CONTAINS_KEY === $param->getType()) {
                    $cont = new Contains();
                    $cont->setValue($param->getValue());
                    $this->contains[] = $cont;
                } elseif (self::NEGATE_KEY === $param->getType()) {
                    $this->setNegate(Project::toBoolean($param->getValue()));
                }
            }
        }
    }