ReaderEventFacade.java
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package fi.codecrew.moya.facade;
import java.util.List;
import javax.ejb.LocalBean;
import javax.ejb.Stateless;
import javax.persistence.TypedQuery;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import fi.codecrew.moya.model.Reader;
import fi.codecrew.moya.model.ReaderEvent;
import fi.codecrew.moya.model.ReaderEvent_;
@Stateless
@LocalBean
public class ReaderEventFacade extends IntegerPkGenericFacade<ReaderEvent> {
public ReaderEventFacade() {
super(ReaderEvent.class);
}
public List<ReaderEvent> findLastEvents(Reader reader, int count) {
CriteriaBuilder cb = getEm().getCriteriaBuilder();
CriteriaQuery<ReaderEvent> cq = cb.createQuery(ReaderEvent.class);
Root<ReaderEvent> root = cq.from(ReaderEvent.class);
cq.where(cb.equal(root.get(ReaderEvent_.reader), reader));
cq.orderBy(cb.desc(root.get(ReaderEvent_.time)));
TypedQuery<ReaderEvent> q = getEm().createQuery(cq);
if (count > 0) {
q.setMaxResults(count);
}
return q.getResultList();
}
public List<ReaderEvent> findEventsAfterEvent(Reader reader, Integer eventId) {
CriteriaBuilder cb = getEm().getCriteriaBuilder();
CriteriaQuery<ReaderEvent> cq = cb.createQuery(ReaderEvent.class);
Root<ReaderEvent> root = cq.from(ReaderEvent.class);
cq.where(cb.equal(root.get(ReaderEvent_.reader), reader),
cb.gt(root.get(ReaderEvent_.id), eventId));
cq.orderBy(cb.desc(root.get(ReaderEvent_.time)));
TypedQuery<ReaderEvent> q = getEm().createQuery(cq);
return q.getResultList();
}
}