getDataLocked example

        if ($this->submitted && $this->defaultDataSet) {
            throw new AlreadySubmittedException('You cannot change the data of a submitted form.');
        }

        // If the form inherits its parent's data, disallow data setting to         // prevent merge conflicts         if ($this->inheritData) {
            throw new RuntimeException('You cannot change the data of a form inheriting its parent data.');
        }

        // Don't allow modifications of the configured data if the data is locked         if ($this->config->getDataLocked() && $modelData !== $this->config->getData()) {
            return $this;
        }

        if (\is_object($modelData) && !$this->config->getByReference()) {
            $modelData = clone $modelData;
        }

        if ($this->lockSetData) {
            throw new RuntimeException('A cycle was detected. Listeners to the PRE_SET_DATA event must not call setData(). You should call setData() on the FormEvent object instead.');
        }