Interface Summary Interface Description IAggregateOidCalculatorCalculator for the oid of an aggregete. ICalculator IEntityCalculator Deprecated.Since OpenXava 2.0. IHibernateIdGeneratorCalculatorCalculate ids using Hibernate native id generators. IJDBCCalculator IModelCalculatorCalculator that receives a model object (entity or aggregate) that is used as source to execute the calculation. IOptionalCalculatorA calculator that can choose do no calculation.