| 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.Node; |
| 13 | import java.util.ArrayList; |
| 14 | import java.util.List; |
| 15 | import javax.persistence.EntityManager; |
| 16 | import javax.persistence.EntityManagerFactory; |
| 17 | import javax.transaction.UserTransaction; |
| 18 | import org.ufcspa.simdecs.bn.entity.BayesianNetwork; |
| 19 | import org.ufcspa.simdecs.bn.jpa.exceptions.NonexistentEntityException; |
| 20 | import org.ufcspa.simdecs.bn.jpa.exceptions.RollbackFailureException; |
| 21 | |
| 22 | /** |
| 23 | * |
| 24 | * @author mchelem |
| 25 | */ |
| 26 | public class BayesianNetworkJpaController implements Serializable { |
| 27 | |
| 28 | public BayesianNetworkJpaController(UserTransaction utx, EntityManagerFactory emf) { |
| 29 | this.utx = utx; |
| 30 | this.emf = emf; |
| 31 | } |
| 32 | private UserTransaction utx = null; |
| 33 | private EntityManagerFactory emf = null; |
| 34 | |
| 35 | public EntityManager getEntityManager() { |
| 36 | return emf.createEntityManager(); |
| 37 | } |
| 38 | |
| 39 | public void create(BayesianNetwork bayesianNetwork) throws RollbackFailureException, Exception { |
| 40 | if (bayesianNetwork.getNodes() == null) { |
| 41 | bayesianNetwork.setNodes(new ArrayList<Node>()); |
| 42 | } |
| 43 | EntityManager em = null; |
| 44 | try { |
| 45 | utx.begin(); |
| 46 | em = getEntityManager(); |
| 47 | List<Node> attachedNodes = new ArrayList<Node>(); |
| 48 | for (Node nodesNodeToAttach : bayesianNetwork.getNodes()) { |
| 49 | nodesNodeToAttach = em.getReference(nodesNodeToAttach.getClass(), nodesNodeToAttach.getId()); |
| 50 | attachedNodes.add(nodesNodeToAttach); |
| 51 | } |
| 52 | bayesianNetwork.setNodes(attachedNodes); |
| 53 | em.persist(bayesianNetwork); |
| 54 | for (Node nodesNode : bayesianNetwork.getNodes()) { |
| 55 | BayesianNetwork oldBayesianNetworkOfNodesNode = nodesNode.getBayesianNetwork(); |
| 56 | nodesNode.setBayesianNetwork(bayesianNetwork); |
| 57 | nodesNode = em.merge(nodesNode); |
| 58 | if (oldBayesianNetworkOfNodesNode != null) { |
| 59 | oldBayesianNetworkOfNodesNode.getNodes().remove(nodesNode); |
| 60 | oldBayesianNetworkOfNodesNode = em.merge(oldBayesianNetworkOfNodesNode); |
| 61 | } |
| 62 | } |
| 63 | utx.commit(); |
| 64 | } catch (Exception ex) { |
| 65 | try { |
| 66 | utx.rollback(); |
| 67 | } catch (Exception re) { |
| 68 | throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re); |
| 69 | } |
| 70 | throw ex; |
| 71 | } finally { |
| 72 | if (em != null) { |
| 73 | em.close(); |
| 74 | } |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | public void edit(BayesianNetwork bayesianNetwork) throws NonexistentEntityException, RollbackFailureException, Exception { |
| 79 | EntityManager em = null; |
| 80 | try { |
| 81 | utx.begin(); |
| 82 | em = getEntityManager(); |
| 83 | BayesianNetwork persistentBayesianNetwork = em.find(BayesianNetwork.class, bayesianNetwork.getId()); |
| 84 | List<Node> nodesOld = persistentBayesianNetwork.getNodes(); |
| 85 | List<Node> nodesNew = bayesianNetwork.getNodes(); |
| 86 | List<Node> attachedNodesNew = new ArrayList<Node>(); |
| 87 | for (Node nodesNewNodeToAttach : nodesNew) { |
| 88 | nodesNewNodeToAttach = em.getReference(nodesNewNodeToAttach.getClass(), nodesNewNodeToAttach.getId()); |
| 89 | attachedNodesNew.add(nodesNewNodeToAttach); |
| 90 | } |
| 91 | nodesNew = attachedNodesNew; |
| 92 | bayesianNetwork.setNodes(nodesNew); |
| 93 | bayesianNetwork = em.merge(bayesianNetwork); |
| 94 | for (Node nodesOldNode : nodesOld) { |
| 95 | if (!nodesNew.contains(nodesOldNode)) { |
| 96 | nodesOldNode.setBayesianNetwork(null); |
| 97 | nodesOldNode = em.merge(nodesOldNode); |
| 98 | } |
| 99 | } |
| 100 | for (Node nodesNewNode : nodesNew) { |
| 101 | if (!nodesOld.contains(nodesNewNode)) { |
| 102 | BayesianNetwork oldBayesianNetworkOfNodesNewNode = nodesNewNode.getBayesianNetwork(); |
| 103 | nodesNewNode.setBayesianNetwork(bayesianNetwork); |
| 104 | nodesNewNode = em.merge(nodesNewNode); |
| 105 | if (oldBayesianNetworkOfNodesNewNode != null && !oldBayesianNetworkOfNodesNewNode.equals(bayesianNetwork)) { |
| 106 | oldBayesianNetworkOfNodesNewNode.getNodes().remove(nodesNewNode); |
| 107 | oldBayesianNetworkOfNodesNewNode = em.merge(oldBayesianNetworkOfNodesNewNode); |
| 108 | } |
| 109 | } |
| 110 | } |
| 111 | utx.commit(); |
| 112 | } catch (Exception ex) { |
| 113 | try { |
| 114 | utx.rollback(); |
| 115 | } catch (Exception re) { |
| 116 | throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re); |
| 117 | } |
| 118 | String msg = ex.getLocalizedMessage(); |
| 119 | if (msg == null || msg.length() == 0) { |
| 120 | Long id = bayesianNetwork.getId(); |
| 121 | if (findBayesianNetwork(id) == null) { |
| 122 | throw new NonexistentEntityException("The bayesianNetwork with id " + id + " no longer exists."); |
| 123 | } |
| 124 | } |
| 125 | throw ex; |
| 126 | } finally { |
| 127 | if (em != null) { |
| 128 | em.close(); |
| 129 | } |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | public void destroy(Long id) throws NonexistentEntityException, RollbackFailureException, Exception { |
| 134 | EntityManager em = null; |
| 135 | try { |
| 136 | utx.begin(); |
| 137 | em = getEntityManager(); |
| 138 | BayesianNetwork bayesianNetwork; |
| 139 | try { |
| 140 | bayesianNetwork = em.getReference(BayesianNetwork.class, id); |
| 141 | bayesianNetwork.getId(); |
| 142 | } catch (EntityNotFoundException enfe) { |
| 143 | throw new NonexistentEntityException("The bayesianNetwork with id " + id + " no longer exists.", enfe); |
| 144 | } |
| 145 | List<Node> nodes = bayesianNetwork.getNodes(); |
| 146 | for (Node nodesNode : nodes) { |
| 147 | nodesNode.setBayesianNetwork(null); |
| 148 | nodesNode = em.merge(nodesNode); |
| 149 | } |
| 150 | em.remove(bayesianNetwork); |
| 151 | utx.commit(); |
| 152 | } catch (Exception ex) { |
| 153 | try { |
| 154 | utx.rollback(); |
| 155 | } catch (Exception re) { |
| 156 | throw new RollbackFailureException("An error occurred attempting to roll back the transaction.", re); |
| 157 | } |
| 158 | throw ex; |
| 159 | } finally { |
| 160 | if (em != null) { |
| 161 | em.close(); |
| 162 | } |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | public List<BayesianNetwork> findBayesianNetworkEntities() { |
| 167 | return findBayesianNetworkEntities(true, -1, -1); |
| 168 | } |
| 169 | |
| 170 | public List<BayesianNetwork> findBayesianNetworkEntities(int maxResults, int firstResult) { |
| 171 | return findBayesianNetworkEntities(false, maxResults, firstResult); |
| 172 | } |
| 173 | |
| 174 | private List<BayesianNetwork> findBayesianNetworkEntities(boolean all, int maxResults, int firstResult) { |
| 175 | EntityManager em = getEntityManager(); |
| 176 | try { |
| 177 | CriteriaQuery cq = em.getCriteriaBuilder().createQuery(); |
| 178 | cq.select(cq.from(BayesianNetwork.class)); |
| 179 | Query q = em.createQuery(cq); |
| 180 | if (!all) { |
| 181 | q.setMaxResults(maxResults); |
| 182 | q.setFirstResult(firstResult); |
| 183 | } |
| 184 | return q.getResultList(); |
| 185 | } finally { |
| 186 | em.close(); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | public BayesianNetwork findBayesianNetwork(Long id) { |
| 191 | EntityManager em = getEntityManager(); |
| 192 | try { |
| 193 | return em.find(BayesianNetwork.class, id); |
| 194 | } finally { |
| 195 | em.close(); |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | public int getBayesianNetworkCount() { |
| 200 | EntityManager em = getEntityManager(); |
| 201 | try { |
| 202 | CriteriaQuery cq = em.getCriteriaBuilder().createQuery(); |
| 203 | Root<BayesianNetwork> rt = cq.from(BayesianNetwork.class); |
| 204 | cq.select(em.getCriteriaBuilder().count(rt)); |
| 205 | Query q = em.createQuery(cq); |
| 206 | return ((Long) q.getSingleResult()).intValue(); |
| 207 | } finally { |
| 208 | em.close(); |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | } |