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// $Id$
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/**
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* Copyright (C) 2007 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.List;
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import java.util.Map;
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import org.hibernate.HibernateException;
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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 org.hibernate.event.spi.SaveOrUpdateEvent;
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import org.hibernate.event.spi.SaveOrUpdateEventListener;
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import eu.etaxonomy.cdm.model.common.CdmBase;
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import eu.etaxonomy.cdm.model.common.ITreeNode;
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@SuppressWarnings("serial")
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public class SaveOrUpdateorMergeEntityListener implements SaveOrUpdateEventListener, MergeEventListener {
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@Override
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public void onSaveOrUpdate(SaveOrUpdateEvent event) throws HibernateException {
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//System.err.println("SaveOrUpdateListener" + event.getEntity().getClass());
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Object entity = event.getObject();
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saveOrUpdateOrMerge(entity, event.getSession());
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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.getOriginal();
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saveOrUpdateOrMerge(entity,event.getSession());
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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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}
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private void saveOrUpdateOrMerge(Object entity, Session session) {
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//moved to CdmPreDataChangeListener
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if(entity != null && CdmBase.class.isAssignableFrom(entity.getClass())){
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if (entity instanceof ITreeNode) {
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ITreeNode<?> node = (ITreeNode<?>)entity;
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reindex(node);
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}
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}
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}
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static String sep = ITreeNode.separator;
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static String pref = ITreeNode.treePrefix;
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/**
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* @param event
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* @param node
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*/
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private <T extends ITreeNode> void reindex(T node) {
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String oldChildIndex = node.treeIndex();
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ITreeNode<?> parent = node.getParent();
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String parentIndex = (parent == null) ? (sep + pref + node.treeId() + sep) : parent.treeIndex(); //TODO
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if (node.getId() > 0){ //TODO
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String newChildIndex = parentIndex + node.getId() + sep;
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if (oldChildIndex == null || ! oldChildIndex.equals(newChildIndex)){
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node.setTreeIndex(newChildIndex);
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//TODO this is a greedy implementation, better use update by replace string
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//either using and improving the below code or by using native SQL
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//The current approach may run out of memory for large descendant sets.
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List<T> childNodes = node.getChildNodes();
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for (T child : childNodes){
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if (child != null && ! child.equals(node)){ //node should not be it's own child, however just in case
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reindex(child);
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}
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}
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// String className = event.getEntityName();
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// String updateQuery = " UPDATE %s tn " +
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// " SET tn.treeIndex = Replace(tn.treeIndex, '%s', '%s') " +
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// " WHERE tn.id <> "+ node.getId()+" ";
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// updateQuery = String.format(updateQuery, className, oldChildIndex, parentIndex); //dummy
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// System.out.println(updateQuery);
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// EventSource session = event.getSession();
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// Query query = session.createQuery(updateQuery);
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// query.executeUpdate();
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}
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}
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}
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}
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