ParameterClass advice

[Huy]

Hi,

Just after some advice on whether or not it's a good/common practice to 
use domain objects for parameterClass especially when you start 
introducing parameter attributes into the domain object which are just 
solely used for queries.

eg.

public class Sale {
   Date saleDate;   // used for both queries and business logic
   Date frSaleDate; // only used for queries
   Date toSaleDate; // only used for queries
}


Regards,

Huy