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.Map;
  13
  14 import org.hibernate.Hibernate;
  15 import org.hibernate.HibernateException;
  16 import org.hibernate.event.spi.MergeEvent;
  17 import org.hibernate.event.spi.MergeEventListener;
  18
  19 import eu.etaxonomy.cdm.model.common.CdmBase;
  20
  21 /**
  22  * @author cmathew
  23  * @date 23 Sep 2015
  24  *
  25  */
  26 public class PostMergeEntityListener implements MergeEventListener {
  27
  28
  29
  30     /* (non-Javadoc)
  31      * @see org.hibernate.event.spi.MergeEventListener#onMerge(org.hibernate.event.spi.MergeEvent)
  32      */
  33     @Override
  34     public void onMerge(MergeEvent event) throws HibernateException {
  35
  36     }
  37
  38     /* (non-Javadoc)
  39      * @see org.hibernate.event.spi.MergeEventListener#onMerge(org.hibernate.event.spi.MergeEvent, java.util.Map)
  40      */
  41     @Override
  42     public void onMerge(MergeEvent event, Map copiedAlready) throws HibernateException {
  43         // at this point the original entity to merge has already been copied to the result
  44         // => the result is an exact copy of the original EXCEPT or the the id which is set by hibernate
  45         // the following code sets the id in the original entity so that it can be used as a return value
  46         // for the CdmEntityDaoBase.merge(T transientObject, boolean returnTransientEntity) call
  47         if(event.getOriginal() != null && CdmBase.class.isAssignableFrom(event.getOriginal().getClass()) &&
  48                 event.getResult() != null && CdmBase.class.isAssignableFrom(event.getResult().getClass())) {
  49             CdmBase original = (CdmBase) event.getOriginal();
  50             CdmBase result = (CdmBase) event.getResult();
  51             if(original != null && Hibernate.isInitialized(original) && original.getId() == 0 &&
  52                     result != null && Hibernate.isInitialized(result)) {
  53                 original.setId(result.getId());
  54
  55             }
  56         }
  57     }
  58
  59 }