private function getCacheFile()
    {
        if (is_null($this->cachePath) || !file_exists($this->cachePath)) {
            $this->error('Invalid Cache Path. '.$this->cachePath);
            return false;
        }
        $cacheKey = is_null($this->cacheKey) ? md5($this->templateFile) : $this->cacheKey;
        return($this->cachePath . $cacheKey);
    }