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

   1 /**
   2  * Copyright (C) 2015 EDIT
   3  * European Distributed Institute of Taxonomy
   4  * http://www.e-taxonomy.eu
   5  *
   6  * The contents of this file are subject to the Mozilla Public License Version 1.1
   7  * See LICENSE.TXT at the top of this package for the full license terms.
   8  */
   9 package eu.etaxonomy.cdm.persistence.hibernate;
  10
  11 import java.util.HashSet;
  12 import java.util.Map;
  13 import java.util.Set;
  14 import java.util.concurrent.ConcurrentHashMap;
  15
  16 import org.hibernate.Hibernate;
  17 import org.hibernate.HibernateException;
  18 import org.hibernate.Session;
  19 import org.hibernate.event.spi.MergeEvent;
  20 import org.hibernate.event.spi.MergeEventListener;
  21
  22 import eu.etaxonomy.cdm.model.common.CdmBase;
  23 import eu.etaxonomy.cdm.model.description.FeatureNode;
  24 import eu.etaxonomy.cdm.model.description.FeatureTree;
  25 import eu.etaxonomy.cdm.model.description.PolytomousKeyNode;
  26 import eu.etaxonomy.cdm.model.taxon.TaxonNode;
  27
  28 /**
  29  * @author cmathew
  30  * @since 23 Sep 2015
  31  *
  32  */
  33 public class PostMergeEntityListener implements MergeEventListener {
  34     private static final long serialVersionUID = 1565797119368313987L;
  35
  36     private static Map<Session, Set<CdmBase>> newEntitiesMap = new ConcurrentHashMap<>();
  37
  38
  39     public static void addSession(Session session) {
  40         newEntitiesMap.put(session, new HashSet<>());
  41     }
  42
  43     public static void removeSession(Session session) {
  44         newEntitiesMap.remove(session);
  45     }
  46
  47     public static Set<CdmBase> getNewEntities(Session session) {
  48         return newEntitiesMap.get(session);
  49     }
  50
  51     @Override
  52     public void onMerge(MergeEvent event) throws HibernateException {
  53         Object entity = event.getEntity();
  54
  55     }
  56
  57     @Override
  58     public void onMerge(MergeEvent event, Map copiedAlready) throws HibernateException {
  59         // any new entities are added to a map which is retrieved at the end of the
  60         // CdmEntityDaoBase.merge(T transientObject, boolean returnTransientEntity) call
  61         if(event.getOriginal() != null && CdmBase.class.isAssignableFrom(event.getOriginal().getClass()) &&
  62                 event.getResult() != null && CdmBase.class.isAssignableFrom(event.getResult().getClass())) {
  63             CdmBase original = (CdmBase) event.getOriginal();
  64             CdmBase result = (CdmBase) event.getResult();
  65             removeNullFromCollections(result);
  66             if(original != null && Hibernate.isInitialized(original) && original.getId() == 0 &&
  67                     result != null && Hibernate.isInitialized(result) && result.getId() > 0) {
  68                 original.setId(result.getId());
  69                 Set<CdmBase> newEntities = newEntitiesMap.get(event.getSession());
  70                 if(newEntities != null) {
  71                     newEntities.add(result);
  72                 }
  73             }
  74         }
  75
  76
  77
  78
  79     }
  80
  81
  82
  83     /**
  84      * @param entity
  85      */
  86     private static void removeNullFromCollections(Object entity) {
  87         if (entity != null){
  88             Class<?> entityClazz = entity.getClass();
  89
  90             if (TaxonNode.class.isAssignableFrom(entityClazz)){
  91                 TaxonNode node = (TaxonNode)entity;
  92                 node.removeNullValueFromChildren();
  93             } else if (PolytomousKeyNode.class.isAssignableFrom(entityClazz)){
  94                 PolytomousKeyNode node = (PolytomousKeyNode) entity;
  95                 if (node.getChildren() != null && Hibernate.isInitialized(node.getChildren()) ){
  96                     node.removeNullValueFromChildren();
  97                     for (PolytomousKeyNode childNode: node.getChildren()){
  98                         removeNullFromCollections(childNode);
  99                     }
 100
 101                 }
 102
 103             }   else if(FeatureTree.class.isAssignableFrom(entityClazz)){
 104
 105                 FeatureTree tree = (FeatureTree)entity;
 106                 for (FeatureNode node:tree.getRootChildren()){
 107                     node.removeNullValueFromChildren();
 108                     if (node.getChildNodes() != null){
 109                         for (FeatureNode childNode: node.getChildNodes()){
 110                             removeNullFromCollections(childNode);
 111                         }
 112                     }
 113
 114                 }
 115             } else if (FeatureNode.class.isAssignableFrom(entityClazz)){
 116                 FeatureNode node = (FeatureNode)entity;
 117                 node.removeNullValueFromChildren();
 118             }
 119
 120         }
 121
 122     }
 123
 124 }