@Override
  public void invoke(@NotNull PsiElement element) {
    PsiComment firstComment = (PsiComment)element;
    while (true) {
      final PsiElement prevComment = PsiTreeUtil.skipWhitespacesBackward(firstComment);
      if (!(prevComment instanceof PsiComment) || ((PsiComment)prevComment).getTokenType() != JavaTokenType.END_OF_LINE_COMMENT) {
        break;
      }
      firstComment = (PsiComment)prevComment;
    }
    final JavaPsiFacade psiFacade = JavaPsiFacade.getInstance(element.getProject());
    final PsiElementFactory factory = psiFacade.getElementFactory();
    final List<PsiComment> multiLineComments = new ArrayList<>();
    PsiElement nextComment = firstComment;
    String whiteSpace = null;
    while (true) {
      nextComment = PsiTreeUtil.skipWhitespacesForward(nextComment);
      if (!(nextComment instanceof PsiComment) || ((PsiComment)nextComment).getTokenType() != JavaTokenType.END_OF_LINE_COMMENT) {
        break;
      }
      if (whiteSpace == null) {
        final PsiElement prevSibling = nextComment.getPrevSibling();
        assert prevSibling != null;
        final String text = prevSibling.getText();
        whiteSpace = getIndent(text);
      }
      multiLineComments.add((PsiComment)nextComment);
    }
    final String newCommentString;
    if (multiLineComments.isEmpty()) {
      final String text = getCommentContents(firstComment);
      newCommentString = "/* " + text.trim() + " */";
    }
    else {
      final StringBuilder text = new StringBuilder();
      text.append("/*\n");
      text.append(whiteSpace);
      text.append(getCommentContents(firstComment));
      for (PsiComment multiLineComment : multiLineComments) {
        text.append('\n');
        text.append(whiteSpace);
        text.append(getCommentContents(multiLineComment));
      }
      text.append('\n');
      text.append(whiteSpace);
      text.append("*/");
      newCommentString = text.toString();
    }
    final PsiComment newComment =
      factory.createCommentFromText(newCommentString, element);
    firstComment.replace(newComment);
    for (PsiElement commentToDelete : multiLineComments) {
      commentToDelete.delete();
    }
  }
@Override
  public void invoke(@NotNull PsiElement element)