private String compareText;

    public BoomerangCellData(ImageIcon icon, String text, String compareText) {
        super(icon, text);
        this.compareText = compareText;
    }

    public void setCompareText(String compareText) {
        this.compareText = compareText;
    }

    public String getCompareText() {
        return compareText;
    }

    @Override
    public int compareTo(CellData o) {
        BoomerangCellData data = (BoomerangCellData) o;
        if (data!= null) {
            if (compareText == null && data.getCompareText() == null) {
                return 0;
            } else if (compareText == null) {
                return -1;
            } else if (data.getCompareText() == null) {
                return 1;
            } else {
                return compareText.compareTo(data.getCompareText());
            }
        }
        return 1;
    }