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package jpa.controllers;
import java.io.Serializable;
import javax.persistence.Query;
import javax.persistence.EntityNotFoundException;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import entity.Courses;
import entity.Coursetag;
import entity.Tag;
import entity.Tagrates;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import jpa.controllers.exceptions.IllegalOrphanException;
import jpa.controllers.exceptions.NonexistentEntityException;
import jpa.controllers.exceptions.PreexistingEntityException;
/**
*
* @author atap
*/
public class CoursetagJpaController implements Serializable {
public CoursetagJpaController(){
}
public CoursetagJpaController(EntityManagerFactory emf) {
this.emf = emf;
}
private EntityManagerFactory emf = Persistence.createEntityManagerFactory("EducationXPU");
public EntityManager getEntityManager() {
return emf.createEntityManager();
}
public void create(Coursetag coursetag) throws PreexistingEntityException, Exception {
if (coursetag.getTagratesList() == null) {
coursetag.setTagratesList(new ArrayList<Tagrates>());
}
EntityManager em = null;
try {
em = getEntityManager();
em.getTransaction().begin();
Courses courseId = coursetag.getCourseId();
if (courseId != null) {
courseId = em.getReference(courseId.getClass(), courseId.getCourseId());
coursetag.setCourseId(courseId);
}
Tag tagId = coursetag.getTagId();
if (tagId != null) {
tagId = em.getReference(tagId.getClass(), tagId.getId());
coursetag.setTagId(tagId);
}
List<Tagrates> attachedTagratesList = new ArrayList<Tagrates>();
for (Tagrates tagratesListTagratesToAttach : coursetag.getTagratesList()) {
tagratesListTagratesToAttach = em.getReference(tagratesListTagratesToAttach.getClass(), tagratesListTagratesToAttach.getId());
attachedTagratesList.add(tagratesListTagratesToAttach);
}
coursetag.setTagratesList(attachedTagratesList);
em.persist(coursetag);
if (courseId != null) {
courseId.getCoursetagList().add(coursetag);
courseId = em.merge(courseId);
}
if (tagId != null) {
tagId.getCoursetagList().add(coursetag);
tagId = em.merge(tagId);
}
for (Tagrates tagratesListTagrates : coursetag.getTagratesList()) {
Coursetag oldCourseTagIdOfTagratesListTagrates = tagratesListTagrates.getCourseTagId();
tagratesListTagrates.setCourseTagId(coursetag);
tagratesListTagrates = em.merge(tagratesListTagrates);
if (oldCourseTagIdOfTagratesListTagrates != null) {
oldCourseTagIdOfTagratesListTagrates.getTagratesList().remove(tagratesListTagrates);
oldCourseTagIdOfTagratesListTagrates = em.merge(oldCourseTagIdOfTagratesListTagrates);
}
}
em.getTransaction().commit();
} catch (Exception ex) {
if (findCoursetag(coursetag.getId()) != null) {
throw new PreexistingEntityException("Coursetag " + coursetag + " already exists.", ex);
}
throw ex;
} finally {
if (em != null) {
em.close();
}
}
}
public void edit(Coursetag coursetag) throws IllegalOrphanException, NonexistentEntityException, Exception {
EntityManager em = null;
try {
em = getEntityManager();
em.getTransaction().begin();
Coursetag persistentCoursetag = em.find(Coursetag.class, coursetag.getId());
Courses courseIdOld = persistentCoursetag.getCourseId();
Courses courseIdNew = coursetag.getCourseId();
Tag tagIdOld = persistentCoursetag.getTagId();
Tag tagIdNew = coursetag.getTagId();
List<Tagrates> tagratesListOld = persistentCoursetag.getTagratesList();
List<Tagrates> tagratesListNew = coursetag.getTagratesList();
List<String> illegalOrphanMessages = null;
for (Tagrates tagratesListOldTagrates : tagratesListOld) {
if (!tagratesListNew.contains(tagratesListOldTagrates)) {
if (illegalOrphanMessages == null) {
illegalOrphanMessages = new ArrayList<String>();
}
illegalOrphanMessages.add("You must retain Tagrates " + tagratesListOldTagrates + " since its courseTagId field is not nullable.");
}
}
if (illegalOrphanMessages != null) {
throw new IllegalOrphanException(illegalOrphanMessages);
}
if (courseIdNew != null) {
courseIdNew = em.getReference(courseIdNew.getClass(), courseIdNew.getCourseId());
coursetag.setCourseId(courseIdNew);
}
if (tagIdNew != null) {
tagIdNew = em.getReference(tagIdNew.getClass(), tagIdNew.getId());
coursetag.setTagId(tagIdNew);
}
List<Tagrates> attachedTagratesListNew = new ArrayList<Tagrates>();
for (Tagrates tagratesListNewTagratesToAttach : tagratesListNew) {
tagratesListNewTagratesToAttach = em.getReference(tagratesListNewTagratesToAttach.getClass(), tagratesListNewTagratesToAttach.getId());
attachedTagratesListNew.add(tagratesListNewTagratesToAttach);
}
tagratesListNew = attachedTagratesListNew;
coursetag.setTagratesList(tagratesListNew);
coursetag = em.merge(coursetag);
if (courseIdOld != null && !courseIdOld.equals(courseIdNew)) {
courseIdOld.getCoursetagList().remove(coursetag);
courseIdOld = em.merge(courseIdOld);
}
if (courseIdNew != null && !courseIdNew.equals(courseIdOld)) {
courseIdNew.getCoursetagList().add(coursetag);
courseIdNew = em.merge(courseIdNew);
}
if (tagIdOld != null && !tagIdOld.equals(tagIdNew)) {
tagIdOld.getCoursetagList().remove(coursetag);
tagIdOld = em.merge(tagIdOld);
}
if (tagIdNew != null && !tagIdNew.equals(tagIdOld)) {
tagIdNew.getCoursetagList().add(coursetag);
tagIdNew = em.merge(tagIdNew);
}
for (Tagrates tagratesListNewTagrates : tagratesListNew) {
if (!tagratesListOld.contains(tagratesListNewTagrates)) {
Coursetag oldCourseTagIdOfTagratesListNewTagrates = tagratesListNewTagrates.getCourseTagId();
tagratesListNewTagrates.setCourseTagId(coursetag);
tagratesListNewTagrates = em.merge(tagratesListNewTagrates);
if (oldCourseTagIdOfTagratesListNewTagrates != null && !oldCourseTagIdOfTagratesListNewTagrates.equals(coursetag)) {
oldCourseTagIdOfTagratesListNewTagrates.getTagratesList().remove(tagratesListNewTagrates);
oldCourseTagIdOfTagratesListNewTagrates = em.merge(oldCourseTagIdOfTagratesListNewTagrates);
}
}
}
em.getTransaction().commit();
} catch (Exception ex) {
String msg = ex.getLocalizedMessage();
if (msg == null || msg.length() == 0) {
Integer id = coursetag.getId();
if (findCoursetag(id) == null) {
throw new NonexistentEntityException("The coursetag with id " + id + " no longer exists.");
}
}
throw ex;
} finally {
if (em != null) {
em.close();
}
}
}
public void destroy(Integer id) throws IllegalOrphanException, NonexistentEntityException {
EntityManager em = null;
try {
em = getEntityManager();
em.getTransaction().begin();
Coursetag coursetag;
try {
coursetag = em.getReference(Coursetag.class, id);
coursetag.getId();
} catch (EntityNotFoundException enfe) {
throw new NonexistentEntityException("The coursetag with id " + id + " no longer exists.", enfe);
}
List<String> illegalOrphanMessages = null;
List<Tagrates> tagratesListOrphanCheck = coursetag.getTagratesList();
for (Tagrates tagratesListOrphanCheckTagrates : tagratesListOrphanCheck) {
if (illegalOrphanMessages == null) {
illegalOrphanMessages = new ArrayList<String>();
}
illegalOrphanMessages.add("This Coursetag (" + coursetag + ") cannot be destroyed since the Tagrates " + tagratesListOrphanCheckTagrates + " in its tagratesList field has a non-nullable courseTagId field.");
}
if (illegalOrphanMessages != null) {
throw new IllegalOrphanException(illegalOrphanMessages);
}
Courses courseId = coursetag.getCourseId();
if (courseId != null) {
courseId.getCoursetagList().remove(coursetag);
courseId = em.merge(courseId);
}
Tag tagId = coursetag.getTagId();
if (tagId != null) {
tagId.getCoursetagList().remove(coursetag);
tagId = em.merge(tagId);
}
em.remove(coursetag);
em.getTransaction().commit();
} finally {
if (em != null) {
em.close();
}
}
}
public List<Coursetag> findCoursetagEntities() {
return findCoursetagEntities(true, -1, -1);
}
public List<Coursetag> findCoursetagEntities(int maxResults, int firstResult) {
return findCoursetagEntities(false, maxResults, firstResult);
}
private List<Coursetag> findCoursetagEntities(boolean all, int maxResults, int firstResult) {
EntityManager em = getEntityManager();
try {
CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
cq.select(cq.from(Coursetag.class));
Query q = em.createQuery(cq);
if (!all) {
q.setMaxResults(maxResults);
q.setFirstResult(firstResult);
}
return q.getResultList();
} finally {
em.close();
}
}
public Coursetag findCoursetag(Integer id) {
EntityManager em = getEntityManager();
try {
return em.find(Coursetag.class, id);
} finally {
em.close();
}
}
public int getCoursetagCount() {
EntityManager em = getEntityManager();
try {
CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
Root<Coursetag> rt = cq.from(Coursetag.class);
cq.select(em.getCriteriaBuilder().count(rt));
Query q = em.createQuery(cq);
return ((Long) q.getSingleResult()).intValue();
} finally {
em.close();
}
}
}