122     def _get_init_status_of_src_dir(self, src_dir):  argument
123         """Get initial status of files in src_dir folder.
125         @param src_dir: directory to be diff-ed.
128         # Dictionary used to store the initial status of files in src_dir.
129         for file_path in self._get_all_files(src_dir):
151     def _copy_new_data_in_file(self, file_path, src_dir, dest_dir):  argument
155         @param src_dir: source directory to do the diff.
156         @param dest_dir: target directory to store new data of src_dir.
174                 # Skip src_dir in path, e.g., src_dir/[sub_dir]/file_name.
176                                            os.path.relpath(file_path, src_dir))
186     def _log_diff(self, src_dir, dest_dir):  argument
187         """Log all of the new data in src_dir to dest_dir.
189         @param src_dir: source directory to do the diff.
190         @param dest_dir: target directory to store new data of src_dir.
194             dir = src_dir.lstrip('/')
202         for src_file in self._get_all_files(src_dir):
203             self._copy_new_data_in_file(src_file, src_dir, dest_dir)