cdmlib-persistence/src/main/java/eu/etaxonomy/cdm/persistence/hibernate/PostMergeEntityListener.java

   1 // $Id$
   2 /**
   3  * Copyright (C) 2015 EDIT
   4  * European Distributed Institute of Taxonomy
   5  * http://www.e-taxonomy.eu
   6  *
   7  * The contents of this file are subject to the Mozilla Public License Version 1.1
   8  * See LICENSE.TXT at the top of this package for the full license terms.
   9  */
  10 package eu.etaxonomy.cdm.persistence.hibernate;
  11
  12 import java.util.HashSet;
  13 import java.util.Map;
  14 import java.util.Set;
  15 import java.util.concurrent.ConcurrentHashMap;
  16
  17 import org.hibernate.Hibernate;
  18 import org.hibernate.HibernateException;
  19 import org.hibernate.Session;
  20 import org.hibernate.event.spi.MergeEvent;
  21 import org.hibernate.event.spi.MergeEventListener;
  22
  23 import eu.etaxonomy.cdm.model.common.CdmBase;
  24
  25 /**
  26  * @author cmathew
  27  * @date 23 Sep 2015
  28  *
  29  */
  30 public class PostMergeEntityListener implements MergeEventListener {
  31     private static final long serialVersionUID = 1565797119368313987L;
  32
  33     private static Map<Session, Set<CdmBase>> newEntitiesMap = new ConcurrentHashMap<Session, Set<CdmBase>>();
  34
  35     public static void addSession(Session session) {
  36         newEntitiesMap.put(session, new HashSet<CdmBase>());
  37     }
  38
  39     public static void removeSession(Session session) {
  40         newEntitiesMap.remove(session);
  41     }
  42
  43     public static Set<CdmBase> getNewEntities(Session session) {
  44         return newEntitiesMap.get(session);
  45     }
  46
  47     @Override
  48     public void onMerge(MergeEvent event) throws HibernateException {
  49
  50     }
  51
  52     @Override
  53     public void onMerge(MergeEvent event, Map copiedAlready) throws HibernateException {
  54         // any new entities are added to a map which is retrieved at the end of the
  55         // CdmEntityDaoBase.merge(T transientObject, boolean returnTransientEntity) call
  56         if(event.getOriginal() != null && CdmBase.class.isAssignableFrom(event.getOriginal().getClass()) &&
  57                 event.getResult() != null && CdmBase.class.isAssignableFrom(event.getResult().getClass())) {
  58             CdmBase original = (CdmBase) event.getOriginal();
  59             CdmBase result = (CdmBase) event.getResult();
  60             if(original != null && Hibernate.isInitialized(original) && original.getId() == 0 &&
  61                     result != null && Hibernate.isInitialized(result) && result.getId() > 0) {
  62                 original.setId(result.getId());
  63                 Set<CdmBase> newEntities = newEntitiesMap.get(event.getSession());
  64                 if(newEntities != null) {
  65                     newEntities.add(result);
  66                 }
  67             }
  68         }
  69
  70
  71     }
  72
  73 }