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package nu.xss.jpa.dao;
import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public abstract class GenericJpaDao<E, K> implements Dao<E, K>, Serializable {
private static final long serialVersionUID = 4998055731089977476L;
protected final Logger logger = LoggerFactory.getLogger(this.getClass());
@PersistenceContext
protected EntityManager entityManager;
protected Class<E> entity;
@SuppressWarnings("unchecked")
public GenericJpaDao() {
ParameterizedType genericSuperclass = (ParameterizedType) getClass()
.getGenericSuperclass();
this.entity = (Class<E>) genericSuperclass.getActualTypeArguments()[0];
}
public void save(E entity) {
logger.info("Persist Entity: {}.", entity.toString());
entityManager.persist(entity);
entityManager.flush();
logger.info("Saved entity: {}.", entity.toString());
}
public void merge(E entity) {
logger.info("Merge Entity: {}.", entity.toString());
entityManager.merge(entity);
entityManager.flush();
logger.info("Saved entity: {}.", entity.toString());
}
public void delete(E entity) {
entityManager.remove(entity);
logger.info("Deleted entity: {}.", entity.toString());
}
public E findById(K id) {
return entityManager.find(entity, id);
}
public List<E> findAll() {
CriteriaBuilder cb = entityManager.getCriteriaBuilder();
CriteriaQuery<E> c = cb.createQuery(this.entity);
Root<E> root = c.from(this.entity);
c.select(root);
return entityManager.createQuery(c).getResultList();
}
}
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