public Formula importFormula ( final Formula formula ) { if ( this . importer == null ) { this . importer = new FormulaFactoryImporter ( this ) ; } final Formula imported = formula . transform ( this . importer ) ; adjustCounters ( imported ) ; return imported ; }
Imports a formula from another formula factory into this factory and returns it . If the current factory of the formula is already this formula factory the same instance will be returned .