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