code: public Folder getFolder(long folderId, EnumSet<SourceInclusion> includes) throws SmartsheetException {
          String path = "folders/" + folderId;
          HashMap<String, Object> parameters = new HashMap<String, Object>();
          parameters.put("include", QueryUtil.generateCommaSeparatedList(includes));
          path += QueryUtil.generateUrl(null, parameters);
  
          return this.getResource(path, Folder.class);
      }
docs: Get a folder.
  
  It mirrors to the following Smartsheet REST API method: GET /folder/{id}
  
  Exceptions:
  InvalidRequestException : if there is any problem with the REST API request
  AuthorizationException : if there is any problem with the REST API authorization(access token)
  ResourceNotFoundException : if the resource can not be found
  ServiceUnavailableException : if the REST API service is not available (possibly due to rate limiting)
  SmartsheetRestException : if there is any other REST API related error occurred during the operation
  SmartsheetException : if there is any other error occurred during the operation
  
  @param folderId the folder id
  @param includes the include parameters
  @return the folder (note that if there is no such resource, this method will throw ResourceNotFoundException
  rather than returning null)
  @throws SmartsheetException the smartsheet exception