docs: private String getFileName(String fileName) {
  
          if (fileName != null) {
              int index = fileName.indexOf(':');
              if (index < 0) {
                  return fileName;
              } else {
  
                  fileName = fileName.substring(index + 1);
  
                  index = fileName.lastIndexOf('/');
                  if (index < 0) {
                      return fileName;
                  } else {
                      return fileName.substring(index + 1);
                  }
  
              }
          }
          return null;
      }