@Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + firstIndex;
        result = prime * result + secondIndex;
        result = prime * result + ((type == null) ? 0 : type.hashCode());
        return result;
    }
Second index i.e for LineChart that will be PointValue index.
hellocharts-library/src/lecho/lib/hellocharts/model/SelectedValue.java