public static @NotNull String readFromFile(@NotNull Class<?> resourceContainerClass, @NonNls @NotNull String fileName) {
    try (InputStream stream = resourceContainerClass.getClassLoader().getResourceAsStream("codeStyle/preview/" + fileName);
         LineNumberReader lineNumberReader = stream == null ? null : new LineNumberReader(new InputStreamReader(stream,
                                                                                                                StandardCharsets.UTF_8))) {
      if (stream == null) throw new IOException("Resource not found: " + "codeStyle/preview/" + fileName);
      final StringBuilder result = new StringBuilder();
      String line;
      while ((line = lineNumberReader.readLine()) != null) {
        result.append(line);
        result.append("\n");
      }

      return result.toString();
    }
    catch (IOException e) {
      LOG.error("Cannot load codestyle preview from" + fileName, e);
      return "";
    }
  }
public static @NotNull String readFromFile(@NotNull Class<?> resourceContainerClass, @NonNls @NotNull String fileName)