/** * If there isn't currently a {@link ThemesTable} for the * current Workbook, then creates one and sets it up. * After this, calls to {@link #getTheme()} won't give null */ public void EnsureThemesTable() { if (theme != null) { return; } theme = (ThemesTable)workbook.CreateRelationship(XSSFRelation.THEME, XSSFFactory.GetInstance()); }