| 1 | /* |
| 2 | * To change this template, choose Tools | Templates |
| 3 | * and open the template in the editor. |
| 4 | */ |
| 5 | package org.ufcspa.simdecs.bn.jpa; |
| 6 | |
| 7 | import java.io.Serializable; |
| 8 | import javax.persistence.Query; |
| 9 | import javax.persistence.EntityNotFoundException; |
| 10 | import javax.persistence.criteria.CriteriaQuery; |
| 11 | import javax.persistence.criteria.Root; |
| 12 | import org.ufcspa.simdecs.bn.entity.BayesianNetwork; |
| 13 | import org.ufcspa.simdecs.bn.entity.Question; |
| 14 | import java.util.ArrayList; |
| 15 | import java.util.List; |
| 16 | import javax.persistence.EntityManager; |
| 17 | import javax.persistence.EntityManagerFactory; |
| 18 | import javax.transaction.UserTransaction; |
| 19 | import org.ufcspa.simdecs.bn.entity.Node; |
| 20 | import org.ufcspa.simdecs.bn.jpa.exceptions.NonexistentEntityException; |
| 21 | import org.ufcspa.simdecs.bn.jpa.exceptions.RollbackFailureException; |
| 22 | |
| 23 | /** |
| 24 | * |
| 25 | * @author mchelem |
| 26 | */ |
| 27 | public class NodeJpaController implements Serializable { |
| 28 | |
| 29 | public NodeJpaController(UserTransaction utx, EntityManagerFactory emf) { |
| 30 | this.utx = utx; |
| 31 | this.emf = emf; |
| 32 | } |
| 33 | private UserTransaction utx = null; |
| 34 | private EntityManagerFactory emf = null; |
| 35 | |
| 36 | public EntityManager getEntityManager() { |
| 37 | return emf.createEntityManager(); |
| 38 | } |
| 39 | |
| 40 | public void create(Node node) throws RollbackFailureException, Exception { |
| 41 | if (node.getQuestions() == null) { |
| 42 | node.setQuestions(new ArrayList<Question>()); |
| 43 | } |
| 44 | EntityManager em = null; |
| 45 | try { |
| 46 | utx.begin(); |
| 47 | em = getEntityManager(); |
| 48 | BayesianNetwork bayesianNetwork = node.getBayesianNetwork(); |
| 49 | if (bayesianNetwork != null) { |
| 50 | bayesianNetwork = em.getReference(bayesianNetwork.getClass(), bayesianNetwork.getId()); |
| 51 | node.setBayesianNetwork(bayesianNetwork); |
| 52 | } |
| 53 | List<Question> attachedQuestions = new ArrayList<Question>(); |
| 54 | for (Question questionsQuestionToAttach : node.getQuestions()) { |
| 55 | questionsQuestionToAttach = em.getReference(questionsQuestionToAttach.getClass(), questionsQuestionToAttach.getId()); |
| 56 | attachedQuestions.add(questionsQuestionToAttach); |
| 57 | } |
| 58 | node.setQuestions(attachedQuestions); |
| 59 | em.persist(node); |
| 60 | if (bayesianNetwork != null) { |
| 61 | bayesianNetwork.getNodes().add(node); |
| 62 | bayesianNetwork = em.merge(bayesianNetwork); |
| 63 | } |
| 64 | for (Question questionsQuestion : node.getQuestions()) { |
| 65 | Node oldNodeOfQuestionsQuestion = questionsQuestion.getNode(); |
| 66 | questionsQuestion.setNode(node); |
| 67 | questionsQuestion = em.merge(questionsQuestion); |
| 68 | if (oldNodeOfQuestionsQuestion != null) { |
| 69 | oldNodeOfQuestionsQuestion.getQuestions().remove(questionsQuestion); |
| 70 | oldNodeOfQuestionsQuestion = em.merge(oldNodeOfQuestionsQuestion); |
| 71 | } |
| 72 | } |
| 73 | utx.commit(); |
| 74 | } catch (Exception ex) { |
| 75 | try { |
| 76 | utx.rollback(); |
| 77 | } catch (Exception re) { |
| 78 | throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re); |
| 79 | } |
| 80 | throw ex; |
| 81 | } finally { |
| 82 | if (em != null) { |
| 83 | em.close(); |
| 84 | } |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | public void edit(Node node) throws NonexistentEntityException, RollbackFailureException, Exception { |
| 89 | EntityManager em = null; |
| 90 | try { |
| 91 | utx.begin(); |
| 92 | em = getEntityManager(); |
| 93 | Node persistentNode = em.find(Node.class, node.getId()); |
| 94 | BayesianNetwork bayesianNetworkOld = persistentNode.getBayesianNetwork(); |
| 95 | BayesianNetwork bayesianNetworkNew = node.getBayesianNetwork(); |
| 96 | List<Question> questionsOld = persistentNode.getQuestions(); |
| 97 | List<Question> questionsNew = node.getQuestions(); |
| 98 | if (bayesianNetworkNew != null) { |
| 99 | bayesianNetworkNew = em.getReference(bayesianNetworkNew.getClass(), bayesianNetworkNew.getId()); |
| 100 | node.setBayesianNetwork(bayesianNetworkNew); |
| 101 | } |
| 102 | List<Question> attachedQuestionsNew = new ArrayList<Question>(); |
| 103 | for (Question questionsNewQuestionToAttach : questionsNew) { |
| 104 | questionsNewQuestionToAttach = em.getReference(questionsNewQuestionToAttach.getClass(), questionsNewQuestionToAttach.getId()); |
| 105 | attachedQuestionsNew.add(questionsNewQuestionToAttach); |
| 106 | } |
| 107 | questionsNew = attachedQuestionsNew; |
| 108 | node.setQuestions(questionsNew); |
| 109 | node = em.merge(node); |
| 110 | if (bayesianNetworkOld != null && !bayesianNetworkOld.equals(bayesianNetworkNew)) { |
| 111 | bayesianNetworkOld.getNodes().remove(node); |
| 112 | bayesianNetworkOld = em.merge(bayesianNetworkOld); |
| 113 | } |
| 114 | if (bayesianNetworkNew != null && !bayesianNetworkNew.equals(bayesianNetworkOld)) { |
| 115 | bayesianNetworkNew.getNodes().add(node); |
| 116 | bayesianNetworkNew = em.merge(bayesianNetworkNew); |
| 117 | } |
| 118 | for (Question questionsOldQuestion : questionsOld) { |
| 119 | if (!questionsNew.contains(questionsOldQuestion)) { |
| 120 | questionsOldQuestion.setNode(null); |
| 121 | questionsOldQuestion = em.merge(questionsOldQuestion); |
| 122 | } |
| 123 | } |
| 124 | for (Question questionsNewQuestion : questionsNew) { |
| 125 | if (!questionsOld.contains(questionsNewQuestion)) { |
| 126 | Node oldNodeOfQuestionsNewQuestion = questionsNewQuestion.getNode(); |
| 127 | questionsNewQuestion.setNode(node); |
| 128 | questionsNewQuestion = em.merge(questionsNewQuestion); |
| 129 | if (oldNodeOfQuestionsNewQuestion != null && !oldNodeOfQuestionsNewQuestion.equals(node)) { |
| 130 | oldNodeOfQuestionsNewQuestion.getQuestions().remove(questionsNewQuestion); |
| 131 | oldNodeOfQuestionsNewQuestion = em.merge(oldNodeOfQuestionsNewQuestion); |
| 132 | } |
| 133 | } |
| 134 | } |
| 135 | utx.commit(); |
| 136 | } catch (Exception ex) { |
| 137 | try { |
| 138 | utx.rollback(); |
| 139 | } catch (Exception re) { |
| 140 | throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re); |
| 141 | } |
| 142 | String msg = ex.getLocalizedMessage(); |
| 143 | if (msg == null || msg.length() == 0) { |
| 144 | Long id = node.getId(); |
| 145 | if (findNode(id) == null) { |
| 146 | throw new NonexistentEntityException("The node with id " + id + " no longer exists."); |
| 147 | } |
| 148 | } |
| 149 | throw ex; |
| 150 | } finally { |
| 151 | if (em != null) { |
| 152 | em.close(); |
| 153 | } |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | public void destroy(Long id) throws NonexistentEntityException, RollbackFailureException, Exception { |
| 158 | EntityManager em = null; |
| 159 | try { |
| 160 | utx.begin(); |
| 161 | em = getEntityManager(); |
| 162 | Node node; |
| 163 | try { |
| 164 | node = em.getReference(Node.class, id); |
| 165 | node.getId(); |
| 166 | } catch (EntityNotFoundException enfe) { |
| 167 | throw new NonexistentEntityException("The node with id " + id + " no longer exists.", enfe); |
| 168 | } |
| 169 | BayesianNetwork bayesianNetwork = node.getBayesianNetwork(); |
| 170 | if (bayesianNetwork != null) { |
| 171 | bayesianNetwork.getNodes().remove(node); |
| 172 | bayesianNetwork = em.merge(bayesianNetwork); |
| 173 | } |
| 174 | List<Question> questions = node.getQuestions(); |
| 175 | for (Question questionsQuestion : questions) { |
| 176 | questionsQuestion.setNode(null); |
| 177 | questionsQuestion = em.merge(questionsQuestion); |
| 178 | } |
| 179 | em.remove(node); |
| 180 | utx.commit(); |
| 181 | } catch (Exception ex) { |
| 182 | try { |
| 183 | utx.rollback(); |
| 184 | } catch (Exception re) { |
| 185 | throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re); |
| 186 | } |
| 187 | throw ex; |
| 188 | } finally { |
| 189 | if (em != null) { |
| 190 | em.close(); |
| 191 | } |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | public List<Node> findNodeEntities() { |
| 196 | return findNodeEntities(true, -1, -1); |
| 197 | } |
| 198 | |
| 199 | public List<Node> findNodeEntities(int maxResults, int firstResult) { |
| 200 | return findNodeEntities(false, maxResults, firstResult); |
| 201 | } |
| 202 | |
| 203 | private List<Node> findNodeEntities(boolean all, int maxResults, int firstResult) { |
| 204 | EntityManager em = getEntityManager(); |
| 205 | try { |
| 206 | CriteriaQuery cq = em.getCriteriaBuilder().createQuery(); |
| 207 | cq.select(cq.from(Node.class)); |
| 208 | Query q = em.createQuery(cq); |
| 209 | if (!all) { |
| 210 | q.setMaxResults(maxResults); |
| 211 | q.setFirstResult(firstResult); |
| 212 | } |
| 213 | return q.getResultList(); |
| 214 | } finally { |
| 215 | em.close(); |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | public Node findNode(Long id) { |
| 220 | EntityManager em = getEntityManager(); |
| 221 | try { |
| 222 | return em.find(Node.class, id); |
| 223 | } finally { |
| 224 | em.close(); |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | public int getNodeCount() { |
| 229 | EntityManager em = getEntityManager(); |
| 230 | try { |
| 231 | CriteriaQuery cq = em.getCriteriaBuilder().createQuery(); |
| 232 | Root<Node> rt = cq.from(Node.class); |
| 233 | cq.select(em.getCriteriaBuilder().count(rt)); |
| 234 | Query q = em.createQuery(cq); |
| 235 | return ((Long) q.getSingleResult()).intValue(); |
| 236 | } finally { |
| 237 | em.close(); |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | } |