@Override
  public String toString() {
    TextChunk[] textChunks = getPresentation().getText();
    StringBuilder result = new StringBuilder();
    for (int j = 0; j < textChunks.length; j++) {
      if (j > 0) result.append("|");
      TextChunk textChunk = textChunks[j];
      result.append(textChunk);
    }

    return result.toString();
  }
@Override
  public String toString()