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.apache.logging.log4j.LogManager;
  17 import org.apache.logging.log4j.Logger;
  18 import org.hibernate.Hibernate;
  19 import org.hibernate.HibernateException;
  20 import org.hibernate.LazyInitializationException;
  21 import org.hibernate.Session;
  22 import org.hibernate.event.spi.MergeEvent;
  23 import org.hibernate.event.spi.MergeEventListener;
  24
  25 import eu.etaxonomy.cdm.model.common.CdmBase;
  26 import eu.etaxonomy.cdm.model.description.PolytomousKey;
  27 import eu.etaxonomy.cdm.model.description.PolytomousKeyNode;
  28 import eu.etaxonomy.cdm.model.taxon.TaxonNode;
  29 import eu.etaxonomy.cdm.model.term.TermNode;
  30 import eu.etaxonomy.cdm.model.term.TermTree;
  31
  32 /**
  33  * @author cmathew
  34  * @since 23 Sep 2015
  35  */
  36 public class PostMergeEntityListener implements MergeEventListener {
  37
  38     private static final long serialVersionUID = 1565797119368313987L;
  39     @SuppressWarnings("unused")
  40     private static final Logger logger = LogManager.getLogger(PostMergeEntityListener.class);
  41
  42     private static Map<Session, Set<CdmBase>> newEntitiesMap = new ConcurrentHashMap<>();
  43
  44     public static void addSession(Session session) {
  45         newEntitiesMap.put(session, new HashSet<>());
  46     }
  47
  48     public static void removeSession(Session session) {
  49         newEntitiesMap.remove(session);
  50     }
  51
  52     public static Set<CdmBase> getNewEntities(Session session) {
  53         return newEntitiesMap.get(session);
  54     }
  55
  56     @Override
  57     public void onMerge(MergeEvent event) throws HibernateException {
  58 //        Object entity = event.getEntity();
  59     }
  60
  61     @Override
  62     public void onMerge(MergeEvent event, Map copiedAlready) throws HibernateException {
  63         // any new entities are added to a map which is retrieved at the end of the
  64         // CdmEntityDaoBase.merge(T transientObject, boolean returnTransientEntity) call
  65         if(event.getOriginal() != null && CdmBase.class.isAssignableFrom(event.getOriginal().getClass()) &&
  66                 event.getResult() != null && CdmBase.class.isAssignableFrom(event.getResult().getClass())) {
  67             CdmBase original = (CdmBase) event.getOriginal();
  68             CdmBase result = (CdmBase) event.getResult();
  69             removeNullFromCollections(result);
  70             if(original != null && Hibernate.isInitialized(original) && original.getId() == 0 &&
  71                     result != null && Hibernate.isInitialized(result) && result.getId() > 0) {
  72                 original.setId(result.getId());
  73                 Set<CdmBase> newEntities = newEntitiesMap.get(event.getSession());
  74                 if(newEntities != null) {
  75                     newEntities.add(result);
  76                 }
  77             }
  78         }
  79     }
  80
  81     private static void removeNullFromCollections(Object entity) {
  82         if (entity != null){
  83             Class<?> entityClazz = entity.getClass();
  84
  85             if (TaxonNode.class.isAssignableFrom(entityClazz)){
  86                 TaxonNode node = (TaxonNode)entity;
  87                 node.removeNullValueFromChildren();
  88             } else if (PolytomousKeyNode.class.isAssignableFrom(entityClazz)){
  89                 PolytomousKeyNode node = (PolytomousKeyNode) entity;
  90                 if (node.getChildren() != null && Hibernate.isInitialized(node.getChildren()) ){
  91                     node.removeNullValueFromChildren();
  92                     for (PolytomousKeyNode childNode: node.getChildren()){
  93                         removeNullFromCollections(childNode);
  94                     }
  95                 }
  96             }else if (PolytomousKey.class.isAssignableFrom(entityClazz)){
  97                 PolytomousKey key = (PolytomousKey) entity;
  98                 PolytomousKeyNode node = key.getRoot();
  99                 if (node != null && node.getChildren() != null && Hibernate.isInitialized(node.getChildren()) ){
 100                     node.removeNullValueFromChildren();
 101                     for (PolytomousKeyNode childNode: node.getChildren()){
 102                         removeNullFromCollections(childNode);
 103                     }
 104                 }
 105             }else if(TermTree.class.isAssignableFrom(entityClazz)){
 106
 107                 TermTree<?> tree = (TermTree<?>)entity;
 108                 tree.removeNullValueFromChildren();
 109                 try{
 110                     for (TermNode<?> node:tree.getRootChildren()){
 111                         node.removeNullValueFromChildren();
 112                         if (node.getChildNodes() != null){
 113                             for (TermNode<?> childNode: node.getChildNodes()){
 114                                 removeNullFromCollections(childNode);
 115                             }
 116                         }
 117                     }
 118                 } catch (LazyInitializationException e) {
 119                     logger.warn("Cannot clean up uninitialized children without a session, skipping.");
 120                 }
 121             } else if (TermNode.class.isAssignableFrom(entityClazz)){
 122                 TermNode<?> node = (TermNode<?>)entity;
 123                 if (Hibernate.isInitialized(node.getChildNodes())){
 124                     node.removeNullValueFromChildren();
 125                 }
 126             }
 127         }
 128     }
 129 }