EventChildGenericFacade.java
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package fi.insomnia.bortal.facade;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.TypedQuery;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import fi.insomnia.bortal.model.EventChildInterface;
import fi.insomnia.bortal.model.EventPk;
import fi.insomnia.bortal.model.LanEvent;
/**
* Session Bean implementation class GenericFacade
*/
public abstract class EventChildGenericFacade<T extends EventChildInterface> {
private static final Logger logger = LoggerFactory.getLogger(EventChildGenericFacade.class);
public T find(Integer eventId, Integer id) {
EventPk pk = new EventPk(eventId, id);
return find(pk);
}
public long count(LanEvent e) {
CriteriaBuilder builder = getEm().getCriteriaBuilder();
CriteriaQuery<Long> query = builder.createQuery(Long.class);
Root<T> entity = query.from(getEntityClass());
query.where(builder.equal(entity.get("id").get("eventId"), e.getId())).select(getEm().getCriteriaBuilder().count(entity));
TypedQuery<Long> q = getEm().createQuery(query);
return q.getSingleResult();
}
private Class<T> entClass;
public EventChildGenericFacade(Class<T> entityClass) {
this.entClass = entityClass;
}
protected Class<T> getEntityClass() {
return entClass;
}
protected abstract EntityManager getEm();
public void create(T entity) {
getEm().persist(entity);
}
public void remove(T entity) {
getEm().remove(entity);
}
public T merge(T entity) {
return getEm().merge(entity);
}
public T find(EventPk id) {
T ret = getEm().find(getEntityClass(), id);
return ret;
}
public List<T> findAll(LanEvent event) {
CriteriaBuilder cb = getEm().getCriteriaBuilder();
CriteriaQuery<T> cq = cb.createQuery(getEntityClass());
Root<T> root = cq.from(getEntityClass());
cq.where(cb.equal(root.get("id").get("eventId"), event.getId()));
cq.orderBy(cb.asc(root.get("id").get("id")));
return getEm().createQuery(cq).getResultList();
}
public List<T> findRange(LanEvent event, int[] range) {
CriteriaQuery<T> cq = getEm().getCriteriaBuilder().createQuery(getEntityClass());
cq.select(cq.from(getEntityClass()));
TypedQuery<T> q = getEm().createQuery(cq);
q.setMaxResults(range[1] - range[0]);
q.setFirstResult(range[0]);
return q.getResultList();
}
protected static <K> K getSingleNullableResult(TypedQuery<K> q) {
K ret = null;
try {
ret = q.getSingleResult();
} catch (NoResultException e) {
ret = null;
}
return ret;
}
public void evict(T entity) {
if (entity != null && entity.getId() != null) {
getEm().getEntityManagerFactory().getCache().evict(getEntityClass(), entity.getId());
}
}
public void evictClass() {
getEm().getEntityManagerFactory().getCache().evict(getClass());
}
}