protected static void addBinding(File srcFile, File form, Map<File, Collection<File>> container) {
    Collection<File> forms = container.get(srcFile);
    if (forms == null) {
      forms = new ArrayList<>();
      container.put(srcFile, forms);
    }
    forms.add(form);
  }
protected static void addBinding(File srcFile, File form, Map<File, Collection<File>> container)