/**
 *
 * @param <IMPL_TYPE> implention of the Model
 * @param <INT_TYPE>  interface of the Model
 */
public class GenericDAOI<IMPL_TYPE extends INT_TYPE , INT_TYPE> implements GenericDAO<INT_TYPE> {

    private EntityManager em;
    private Class<INT_TYPE> interfaceType;
    private Class<IMPL_TYPE> implType;

    public GenericDAOI(EntityManager em, Class<IMPL_TYPE> tType, Class<INT_TYPE> sType) {
        this.em = em;
        this.implType = tType;
        this.interfaceType = sType;
    }

    @Override
    public INT_TYPE findById(Long id) {
        INT_TYPE elem = em.find(implType, id);
        return elem;
    }

    @Override
    public List<INT_TYPE> findAll() {
        String sqlQueryAll = "FROM " + implType.getName();
        return em.createQuery(sqlQueryAll, interfaceType).getResultList();
    }
}