@NotNull
  List<FileNameMatcher> getMappingsForFileType(@NotNull String fileTypeName) {
    return myRemovedMappings.values().stream()
      .filter(mapping -> mapping.myFileTypeName.equals(fileTypeName))
      .map(mapping -> mapping.myFileNameMatcher)
      .collect(Collectors.toList());
  }
@NotNull
  List<FileNameMatcher> getMappingsForFileType(@NotNull String fileTypeName)