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/**
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* Copyright (C) 2015 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.persistence.hibernate;
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import java.util.HashSet;
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import java.util.Map;
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import java.util.Set;
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import java.util.concurrent.ConcurrentHashMap;
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import org.apache.logging.log4j.LogManager;import org.apache.logging.log4j.Logger;
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import org.hibernate.Hibernate;
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import org.hibernate.HibernateException;
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import org.hibernate.LazyInitializationException;
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import org.hibernate.Session;
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import org.hibernate.event.spi.MergeEvent;
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import org.hibernate.event.spi.MergeEventListener;
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import eu.etaxonomy.cdm.model.common.CdmBase;
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import eu.etaxonomy.cdm.model.description.PolytomousKey;
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import eu.etaxonomy.cdm.model.description.PolytomousKeyNode;
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import eu.etaxonomy.cdm.model.taxon.TaxonNode;
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import eu.etaxonomy.cdm.model.term.TermNode;
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import eu.etaxonomy.cdm.model.term.TermTree;
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/**
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* @author cmathew
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* @since 23 Sep 2015
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*/
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public class PostMergeEntityListener implements MergeEventListener {
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private static final long serialVersionUID = 1565797119368313987L;
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private static Map<Session, Set<CdmBase>> newEntitiesMap = new ConcurrentHashMap<>();
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private static final Logger logger = LogManager.getLogger(PostMergeEntityListener.class);
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public static void addSession(Session session) {
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newEntitiesMap.put(session, new HashSet<>());
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}
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public static void removeSession(Session session) {
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newEntitiesMap.remove(session);
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}
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public static Set<CdmBase> getNewEntities(Session session) {
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return newEntitiesMap.get(session);
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}
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@Override
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public void onMerge(MergeEvent event) throws HibernateException {
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Object entity = event.getEntity();
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}
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@Override
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public void onMerge(MergeEvent event, Map copiedAlready) throws HibernateException {
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// any new entities are added to a map which is retrieved at the end of the
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// CdmEntityDaoBase.merge(T transientObject, boolean returnTransientEntity) call
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if(event.getOriginal() != null && CdmBase.class.isAssignableFrom(event.getOriginal().getClass()) &&
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event.getResult() != null && CdmBase.class.isAssignableFrom(event.getResult().getClass())) {
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CdmBase original = (CdmBase) event.getOriginal();
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CdmBase result = (CdmBase) event.getResult();
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removeNullFromCollections(result);
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if(original != null && Hibernate.isInitialized(original) && original.getId() == 0 &&
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result != null && Hibernate.isInitialized(result) && result.getId() > 0) {
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original.setId(result.getId());
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Set<CdmBase> newEntities = newEntitiesMap.get(event.getSession());
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if(newEntities != null) {
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newEntities.add(result);
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}
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}
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}
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}
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private static void removeNullFromCollections(Object entity) {
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if (entity != null){
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Class<?> entityClazz = entity.getClass();
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if (TaxonNode.class.isAssignableFrom(entityClazz)){
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TaxonNode node = (TaxonNode)entity;
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node.removeNullValueFromChildren();
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} else if (PolytomousKeyNode.class.isAssignableFrom(entityClazz)){
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PolytomousKeyNode node = (PolytomousKeyNode) entity;
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if (node.getChildren() != null && Hibernate.isInitialized(node.getChildren()) ){
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node.removeNullValueFromChildren();
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for (PolytomousKeyNode childNode: node.getChildren()){
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removeNullFromCollections(childNode);
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}
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}
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}else if (PolytomousKey.class.isAssignableFrom(entityClazz)){
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PolytomousKey key = (PolytomousKey) entity;
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PolytomousKeyNode node = key.getRoot();
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if (node != null && node.getChildren() != null && Hibernate.isInitialized(node.getChildren()) ){
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node.removeNullValueFromChildren();
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for (PolytomousKeyNode childNode: node.getChildren()){
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removeNullFromCollections(childNode);
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}
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}
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}else if(TermTree.class.isAssignableFrom(entityClazz)){
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TermTree<?> tree = (TermTree<?>)entity;
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tree.removeNullValueFromChildren();
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try{
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for (TermNode<?> node:tree.getRootChildren()){
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node.removeNullValueFromChildren();
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if (node.getChildNodes() != null){
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for (TermNode<?> childNode: node.getChildNodes()){
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removeNullFromCollections(childNode);
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}
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}
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}
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} catch (LazyInitializationException e) {
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logger.warn("Cannot clean up uninitialized children without a session, skipping.");
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}
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} else if (TermNode.class.isAssignableFrom(entityClazz)){
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TermNode<?> node = (TermNode<?>)entity;
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if (Hibernate.isInitialized(node.getChildNodes())){
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node.removeNullValueFromChildren();
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}
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}
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}
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}
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}
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