/*
* Copyright (C) 2014 Mathias Reppe <mathias.reppe@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package at.reppeitsolutions.formbuilder.model.controller;
import java.io.Serializable;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.Query;
import javax.persistence.EntityNotFoundException;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import javax.transaction.UserTransaction;
import at.reppeitsolutions.formbuilder.model.Form;
import at.reppeitsolutions.formbuilder.model.controller.exceptions.NonexistentEntityException;
import at.reppeitsolutions.formbuilder.model.controller.exceptions.PreexistingEntityException;
import at.reppeitsolutions.formbuilder.model.controller.exceptions.RollbackFailureException;
/**
*
* @author Mathias Reppe <mathias.reppe@gmail.com>
*/
public class FormJpaController implements Serializable {
public FormJpaController(UserTransaction utx, EntityManager em) {
this.utx = utx;
this.em = em;
}
private UserTransaction utx = null;
private EntityManager em = null;
public void create(Form form) throws PreexistingEntityException, RollbackFailureException, Exception {
try {
utx.begin();
em.persist(form);
utx.commit();
} catch (Exception ex) {
try {
utx.rollback();
} catch (Exception re) {
throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re);
}
if (findForm(form.getId()) != null) {
throw new PreexistingEntityException("Form " + form + " already exists.", ex);
}
throw ex;
}
}
public void edit(Form form) throws NonexistentEntityException, RollbackFailureException, Exception {
try {
utx.begin();
form = em.merge(form);
utx.commit();
} catch (Exception ex) {
try {
utx.rollback();
} catch (Exception re) {
throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re);
}
String msg = ex.getLocalizedMessage();
if (msg == null || msg.length() == 0) {
Long id = form.getId();
if (findForm(id) == null) {
throw new NonexistentEntityException("The form with id " + id + " no longer exists.");
}
}
throw ex;
}
}
public void destroy(Long id) throws NonexistentEntityException, RollbackFailureException, Exception {
try {
utx.begin();
Form form;
try {
form = em.getReference(Form.class, id);
form.getId();
} catch (EntityNotFoundException enfe) {
throw new NonexistentEntityException("The form with id " + id + " no longer exists.", enfe);
}
em.remove(form);
utx.commit();
} catch (Exception ex) {
try {
utx.rollback();
} catch (Exception re) {
throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re);
}
throw ex;
}
}
public List<Form> findFormEntities() {
return findFormEntities(true, -1, -1);
}
public List<Form> findFormEntities(int maxResults, int firstResult) {
return findFormEntities(false, maxResults, firstResult);
}
private List<Form> findFormEntities(boolean all, int maxResults, int firstResult) {
CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
cq.select(cq.from(Form.class));
Query q = em.createQuery(cq);
if (!all) {
q.setMaxResults(maxResults);
q.setFirstResult(firstResult);
}
return q.getResultList();
}
public Form findForm(Long id) {
return em.find(Form.class, id);
}
public int getFormCount() {
CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
Root<Form> rt = cq.from(Form.class);
cq.select(em.getCriteriaBuilder().count(rt));
Query q = em.createQuery(cq);
return ((Long) q.getSingleResult()).intValue();
}
}