code: @SuppressWarnings("unused")
  	private void genDirStructure() throws IOException {
  		BufferedReader in = new BufferedReader(new FileReader(new File(inDir,
  				StructureGenerator.DIR_STRUCTURE_FILE_NAME)));
  		String line;
  		while ((line = in.readLine()) != null) {
  			fs.mkdirs(new Path(root + line));
  		}
  	}
docs: Read directory structure file under the input directory. Create each
  directory under the specified root. The directory names are relative to
  the specified root.