/**
* For copyright information see the LICENSE document.
*/
package gwlpr.database.jpa;
import java.io.Serializable;
import javax.persistence.Query;
import javax.persistence.EntityNotFoundException;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import gwlpr.database.entities.Character;
import gwlpr.database.entities.Level;
import gwlpr.database.jpa.exceptions.NonexistentEntityException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
/**
*
* @author _rusty
*/
public class LevelJpaController implements Serializable
{
public LevelJpaController(EntityManagerFactory emf) {
this.emf = emf;
}
private EntityManagerFactory emf = null;
public EntityManager getEntityManager() {
return emf.createEntityManager();
}
public void create(Level level) {
if (level.getCharacterCollection() == null) {
level.setCharacterCollection(new ArrayList<Character>());
}
EntityManager em = null;
try {
em = getEntityManager();
em.getTransaction().begin();
Collection<Character> attachedCharacterCollection = new ArrayList<Character>();
for (Character characterCollectionCharacterToAttach : level.getCharacterCollection()) {
characterCollectionCharacterToAttach = em.getReference(characterCollectionCharacterToAttach.getClass(), characterCollectionCharacterToAttach.getId());
attachedCharacterCollection.add(characterCollectionCharacterToAttach);
}
level.setCharacterCollection(attachedCharacterCollection);
em.persist(level);
for (Character characterCollectionCharacter : level.getCharacterCollection()) {
Level oldLevelOfCharacterCollectionCharacter = characterCollectionCharacter.getLevel();
characterCollectionCharacter.setLevel(level);
characterCollectionCharacter = em.merge(characterCollectionCharacter);
if (oldLevelOfCharacterCollectionCharacter != null) {
oldLevelOfCharacterCollectionCharacter.getCharacterCollection().remove(characterCollectionCharacter);
oldLevelOfCharacterCollectionCharacter = em.merge(oldLevelOfCharacterCollectionCharacter);
}
}
em.getTransaction().commit();
} finally {
if (em != null) {
em.close();
}
}
}
public void edit(Level level) throws NonexistentEntityException, Exception {
EntityManager em = null;
try {
em = getEntityManager();
em.getTransaction().begin();
Level persistentLevel = em.find(Level.class, level.getLevel());
Collection<Character> characterCollectionOld = persistentLevel.getCharacterCollection();
Collection<Character> characterCollectionNew = level.getCharacterCollection();
Collection<Character> attachedCharacterCollectionNew = new ArrayList<Character>();
for (Character characterCollectionNewCharacterToAttach : characterCollectionNew) {
characterCollectionNewCharacterToAttach = em.getReference(characterCollectionNewCharacterToAttach.getClass(), characterCollectionNewCharacterToAttach.getId());
attachedCharacterCollectionNew.add(characterCollectionNewCharacterToAttach);
}
characterCollectionNew = attachedCharacterCollectionNew;
level.setCharacterCollection(characterCollectionNew);
level = em.merge(level);
for (Character characterCollectionOldCharacter : characterCollectionOld) {
if (!characterCollectionNew.contains(characterCollectionOldCharacter)) {
characterCollectionOldCharacter.setLevel(null);
characterCollectionOldCharacter = em.merge(characterCollectionOldCharacter);
}
}
for (Character characterCollectionNewCharacter : characterCollectionNew) {
if (!characterCollectionOld.contains(characterCollectionNewCharacter)) {
Level oldLevelOfCharacterCollectionNewCharacter = characterCollectionNewCharacter.getLevel();
characterCollectionNewCharacter.setLevel(level);
characterCollectionNewCharacter = em.merge(characterCollectionNewCharacter);
if (oldLevelOfCharacterCollectionNewCharacter != null && !oldLevelOfCharacterCollectionNewCharacter.equals(level)) {
oldLevelOfCharacterCollectionNewCharacter.getCharacterCollection().remove(characterCollectionNewCharacter);
oldLevelOfCharacterCollectionNewCharacter = em.merge(oldLevelOfCharacterCollectionNewCharacter);
}
}
}
em.getTransaction().commit();
} catch (Exception ex) {
String msg = ex.getLocalizedMessage();
if (msg == null || msg.length() == 0) {
Integer id = level.getLevel();
if (findLevel(id) == null) {
throw new NonexistentEntityException("The level with id " + id + " no longer exists.");
}
}
throw ex;
} finally {
if (em != null) {
em.close();
}
}
}
public void destroy(Integer id) throws NonexistentEntityException {
EntityManager em = null;
try {
em = getEntityManager();
em.getTransaction().begin();
Level level;
try {
level = em.getReference(Level.class, id);
level.getLevel();
} catch (EntityNotFoundException enfe) {
throw new NonexistentEntityException("The level with id " + id + " no longer exists.", enfe);
}
Collection<Character> characterCollection = level.getCharacterCollection();
for (Character characterCollectionCharacter : characterCollection) {
characterCollectionCharacter.setLevel(null);
characterCollectionCharacter = em.merge(characterCollectionCharacter);
}
em.remove(level);
em.getTransaction().commit();
} finally {
if (em != null) {
em.close();
}
}
}
public List<Level> findLevelEntities() {
return findLevelEntities(true, -1, -1);
}
public List<Level> findLevelEntities(int maxResults, int firstResult) {
return findLevelEntities(false, maxResults, firstResult);
}
private List<Level> findLevelEntities(boolean all, int maxResults, int firstResult) {
EntityManager em = getEntityManager();
try {
CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
cq.select(cq.from(Level.class));
Query q = em.createQuery(cq);
if (!all) {
q.setMaxResults(maxResults);
q.setFirstResult(firstResult);
}
return q.getResultList();
} finally {
em.close();
}
}
public Level findLevel(Integer id) {
EntityManager em = getEntityManager();
try {
return em.find(Level.class, id);
} finally {
em.close();
}
}
public int getLevelCount() {
EntityManager em = getEntityManager();
try {
CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
Root<Level> rt = cq.from(Level.class);
cq.select(em.getCriteriaBuilder().count(rt));
Query q = em.createQuery(cq);
return ((Long) q.getSingleResult()).intValue();
} finally {
em.close();
}
}
}