Implementing dynamic paged queries - POJOs in Action: Developing Enterprise Applications with Lightweight Frameworks - page 443

<<interface>>
OrderRepository

PagedQuery
Result

PagedQueryResult findOrders(startingIndex, pageSize, OrderSearchCriteria)
...

more

Hibernate
OrderRepository

Order

Impl

Hibernate
FindOrders
Callback

Spring

Hibernate

<<interface>>
Session

<<interface>
Criteria

HibernateTemplate

<<interface>>
HibernateCallback

execute(HibernateTemplate)

Figure 11.6 Hibernate implementation of the OrderRepository

that generates a query from the OrderSearchCriteria using the Hibernate Crite-
ria API . Let's look at the HibernateOrderRepositoryImpl and HibernateFind-
OrdersCallback classes.

11.5.1 The HibernateOrderRepositoryImpl class

The findOrders() method is extremely simple. It uses a HibernateTemplate to
execute a FindOrdersHibernateCallback , which does all of the work. Here is the
code for HibernateOrderRepositoryImpl :

public class HibernateOrderRepositoryImpl extends
HibernateDaoSupport implements OrderRepository {

public PagedQueryResult findOrders(int startingIndex,
int pageSize,
OrderSearchCriteria searchCriteria) {
bb return (PagedQueryResult) getHibernateTemplate().execute(
bb new FindOrdersHibernateCallback(startingIndex,
bb pageSize, searchCriteria));
}
}