/**
  * @param string $func
  * @param string $filename
  */
 public function render($func = 'type', $filename = null)
 {
     if (!$filename) {
         return;
     }
     switch ($func) {
         case 'suffix':
             return $this->fileHelper->suffix($filename);
         case 'type':
             return $this->fileHelper->filetype($filename);
         case 'basename':
             return basename($filename);
         case 'filesize':
             if (!file_exists($filename)) {
                 return 0;
             }
             return filesize($filename);
         case 'exists':
             return $this->fileHelper->exists($filename);
     }
 }