public void setColumnChartData(ColumnChartData columnChartData) {
        if (null == columnChartData) {
            this.columnChartData = new ColumnChartData();
        } else {
            this.columnChartData = columnChartData;
        }
    }
Data model for combo line-column chart. It uses ColumnChartData and LineChartData internally.
hellocharts-library/src/lecho/lib/hellocharts/model/ComboLineColumnChartData.java