GenericFacade.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.ModelInterface;
/**
* Session Bean implementation class GenericFacade
*/
public abstract class GenericFacade<PK, T extends ModelInterface> {
private static final Logger logger = LoggerFactory.getLogger(GenericFacade.class);
private Class<T> entClass;
public GenericFacade(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(PK id) {
T ret = getEm().find(getEntityClass(), id);
return ret;
}
public List<T> findAll() {
CriteriaBuilder cb = getEm().getCriteriaBuilder();
CriteriaQuery<T> cq = cb.createQuery(getEntityClass());
Root<T> root = cq.from(getEntityClass());
cq.orderBy(cb.asc(root.get("id")));
cq.select(cq.from(getEntityClass()));
return getEm().createQuery(cq).getResultList();
}
public List<T> findRange(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();
}
public long count() {
CriteriaQuery<Long> cq = getEm().getCriteriaBuilder().createQuery(Long.class);
Root<T> rt = cq.from(getEntityClass());
cq.select(getEm().getCriteriaBuilder().count(rt));
TypedQuery<Long> q = getEm().createQuery(cq);
return q.getSingleResult();
}
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());
}
}
//
// @SuppressWarnings("unchecked")
// public List<T> search(String query, String[] fields) {
// CompassSession sess =
// EclipseLinkHelper.getCurrentCompassSession(getEm());
// CompassQueryBuilder qb = sess.queryBuilder();
// CompassMultiPropertyQueryStringBuilder properties =
// qb.multiPropertyQueryString(query);
//
// for (String field : fields) {
// properties.add(field);
// }
// String alias = getClass().getSimpleName().toLowerCase();
//
// logger.debug("searching class {}", alias);
// CompassHits hits =
// qb.bool().addMust(qb.alias(alias)).addMust(properties.toQuery()).toQuery().hits();
//
// Iterator<CompassHit> iter = hits.iterator();
// ArrayList<T> ret = new ArrayList<T>();
// while (iter.hasNext()) {
//
// Object data = iter.next().getData();
// logger.debug("Found user {}", data);
// ret.add((T) data);
//
// }
// return ret;
//
// }
}