GenericFacade.java
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package fi.insomnia.bortal.facade;
import java.util.ArrayList;
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.Path;
import javax.persistence.criteria.Predicate;
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 final 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) {
if (id == null) {
return null;
}
T ret = getEm().find(getEntityClass(), id);
return ret;
}
public List<T> findAll() {
return findAll(null);
}
public List<T> findAll(String sort) {
return findAll(0, 0, sort);
}
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());
}
}
protected List<T> search(String query, String[] fields, String orderfield) {
return search(0, 0, query, fields, orderfield);
}
protected List<T> search(int page, int pagesize, String query, String[] fields, String orderfield) {
CriteriaBuilder cb = getEm().getCriteriaBuilder();
CriteriaQuery<T> cq = cb.createQuery(getEntityClass());
Root<T> root = cq.from(getEntityClass());
addPredicates(cb, cq, root, query, fields);
if (orderfield != null) {
cq.orderBy(cb.asc(root.get(orderfield)));
}
cq.select(root);
TypedQuery<T> q = getEm().createQuery(cq);
if (pagesize > 0) {
q.setFirstResult(page * pagesize);
q.setMaxResults(pagesize);
}
List<T> ret = q.getResultList();
return ret;
}
protected long searchCount(String query, String[] fields) {
CriteriaBuilder cb = getEm().getCriteriaBuilder();
CriteriaQuery<Long> cq = cb.createQuery(Long.class);
Root<T> root = cq.from(getEntityClass());
addPredicates(cb, cq, root, query, fields);
cq.select(getEm().getCriteriaBuilder().count(root));
TypedQuery<Long> q = getEm().createQuery(cq);
return q.getSingleResult();
}
private void addPredicates(CriteriaBuilder cb, CriteriaQuery<?> cq, Root<T> root, String query, String[] fields) {
List<Predicate> preds = new ArrayList<Predicate>();
for (String field : fields) {
Path<String> rootfield = root.get(field);
preds.add(cb.like(cb.lower(rootfield), query));
}
cq.where(cb.or(preds.toArray(new Predicate[preds.size()])));
}
public List<T> findAll(int page, int pagesize, String sort) {
CriteriaBuilder cb = getEm().getCriteriaBuilder();
CriteriaQuery<T> cq = cb.createQuery(getEntityClass());
Root<T> root = cq.from(getEntityClass());
if (sort != null) {
cq.orderBy(cb.asc(root.get(sort)));
}
cq.select(cq.from(getEntityClass()));
TypedQuery<T> q = getEm().createQuery(cq);
if (pagesize > 0) {
q.setFirstResult(page * pagesize);
q.setMaxResults(pagesize);
}
return q.getResultList();
}
}