public void edit(Carrera carrera) throws NonexistentEntityException, Exception {
EntityManager em = null;
try {
em = getEntityManager();
em.getTransaction().begin();
Carrera persistentCarrera = em.find(Carrera.class, carrera.getIdCarrera());
Collection<Alumno> alumnoCollectionOld = persistentCarrera.getAlumnoCollection();
Collection<Alumno> alumnoCollectionNew = carrera.getAlumnoCollection();
Collection<Alumno> attachedAlumnoCollectionNew = new ArrayList<Alumno>();
for (Alumno alumnoCollectionNewAlumnoToAttach : alumnoCollectionNew) {
alumnoCollectionNewAlumnoToAttach =
em.getReference(
alumnoCollectionNewAlumnoToAttach.getClass(),
alumnoCollectionNewAlumnoToAttach.getIdAlumnos());
attachedAlumnoCollectionNew.add(alumnoCollectionNewAlumnoToAttach);
}
alumnoCollectionNew = attachedAlumnoCollectionNew;
carrera.setAlumnoCollection(alumnoCollectionNew);
carrera = em.merge(carrera);
for (Alumno alumnoCollectionOldAlumno : alumnoCollectionOld) {
if (!alumnoCollectionNew.contains(alumnoCollectionOldAlumno)) {
alumnoCollectionOldAlumno.setIdCarreraFK(null);
alumnoCollectionOldAlumno = em.merge(alumnoCollectionOldAlumno);
}
}
for (Alumno alumnoCollectionNewAlumno : alumnoCollectionNew) {
if (!alumnoCollectionOld.contains(alumnoCollectionNewAlumno)) {
Carrera oldIdCarreraFKOfAlumnoCollectionNewAlumno =
alumnoCollectionNewAlumno.getIdCarreraFK();
alumnoCollectionNewAlumno.setIdCarreraFK(carrera);
alumnoCollectionNewAlumno = em.merge(alumnoCollectionNewAlumno);
if (oldIdCarreraFKOfAlumnoCollectionNewAlumno != null
&& !oldIdCarreraFKOfAlumnoCollectionNewAlumno.equals(carrera)) {
oldIdCarreraFKOfAlumnoCollectionNewAlumno
.getAlumnoCollection()
.remove(alumnoCollectionNewAlumno);
oldIdCarreraFKOfAlumnoCollectionNewAlumno =
em.merge(oldIdCarreraFKOfAlumnoCollectionNewAlumno);
}
}
}
em.getTransaction().commit();
} catch (Exception ex) {
String msg = ex.getLocalizedMessage();
if (msg == null || msg.length() == 0) {
Integer id = carrera.getIdCarrera();
if (findCarrera(id) == null) {
throw new NonexistentEntityException("The carrera with id " + id + " no longer exists.");
}
}
throw ex;
} finally {
if (em != null) {
em.close();
}
}
}
public void create(Carrera carrera) throws PreexistingEntityException, Exception {
if (carrera.getAlumnoCollection() == null) {
carrera.setAlumnoCollection(new ArrayList<Alumno>());
}
EntityManager em = null;
try {
em = getEntityManager();
em.getTransaction().begin();
Collection<Alumno> attachedAlumnoCollection = new ArrayList<Alumno>();
for (Alumno alumnoCollectionAlumnoToAttach : carrera.getAlumnoCollection()) {
alumnoCollectionAlumnoToAttach =
em.getReference(
alumnoCollectionAlumnoToAttach.getClass(),
alumnoCollectionAlumnoToAttach.getIdAlumnos());
attachedAlumnoCollection.add(alumnoCollectionAlumnoToAttach);
}
carrera.setAlumnoCollection(attachedAlumnoCollection);
em.persist(carrera);
for (Alumno alumnoCollectionAlumno : carrera.getAlumnoCollection()) {
Carrera oldIdCarreraFKOfAlumnoCollectionAlumno = alumnoCollectionAlumno.getIdCarreraFK();
alumnoCollectionAlumno.setIdCarreraFK(carrera);
alumnoCollectionAlumno = em.merge(alumnoCollectionAlumno);
if (oldIdCarreraFKOfAlumnoCollectionAlumno != null) {
oldIdCarreraFKOfAlumnoCollectionAlumno
.getAlumnoCollection()
.remove(alumnoCollectionAlumno);
oldIdCarreraFKOfAlumnoCollectionAlumno = em.merge(oldIdCarreraFKOfAlumnoCollectionAlumno);
}
}
em.getTransaction().commit();
} catch (Exception ex) {
if (findCarrera(carrera.getIdCarrera()) != null) {
throw new PreexistingEntityException("Carrera " + carrera + " already exists.", ex);
}
throw ex;
} finally {
if (em != null) {
em.close();
}
}
}