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The core O/RM functionality as provided by Hibernate
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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Middleware LLC.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 *
 */
package org.hibernate.action;

import org.hibernate.HibernateException;
import org.hibernate.event.PostCollectionRecreateEventListener;
import org.hibernate.event.PostCollectionRecreateEvent;
import org.hibernate.event.EventSource;
import org.hibernate.event.PreCollectionRecreateEvent;
import org.hibernate.event.PreCollectionRecreateEventListener;
import org.hibernate.cache.CacheException;
import org.hibernate.collection.PersistentCollection;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.persister.collection.CollectionPersister;

import java.io.Serializable;

public final class CollectionRecreateAction extends CollectionAction {

	public CollectionRecreateAction(
				final PersistentCollection collection, 
				final CollectionPersister persister, 
				final Serializable id, 
				final SessionImplementor session)
			throws CacheException {
		super( persister, collection, id, session );
	}

	public void execute() throws HibernateException {
		// this method is called when a new non-null collection is persisted
		// or when an existing (non-null) collection is moved to a new owner
		final PersistentCollection collection = getCollection();
		
		preRecreate();

		getPersister().recreate( collection, getKey(), getSession() );
		
		getSession().getPersistenceContext()
				.getCollectionEntry(collection)
				.afterAction(collection);
		
		evict();

		postRecreate();

		if ( getSession().getFactory().getStatistics().isStatisticsEnabled() ) {
			getSession().getFactory().getStatisticsImplementor()
					.recreateCollection( getPersister().getRole() );
		}
	}

	private void preRecreate() {
		PreCollectionRecreateEventListener[] preListeners = getSession().getListeners()
				.getPreCollectionRecreateEventListeners();
		if (preListeners.length > 0) {
			PreCollectionRecreateEvent preEvent = new PreCollectionRecreateEvent(
					getPersister(), getCollection(), ( EventSource ) getSession() );
			for ( int i = 0; i < preListeners.length; i++ ) {
				preListeners[i].onPreRecreateCollection( preEvent );
			}
		}
	}

	private void postRecreate() {
		PostCollectionRecreateEventListener[] postListeners = getSession().getListeners()
				.getPostCollectionRecreateEventListeners();
		if (postListeners.length > 0) {
			PostCollectionRecreateEvent postEvent = new PostCollectionRecreateEvent(
					getPersister(), getCollection(), ( EventSource ) getSession() );
			for ( int i = 0; i < postListeners.length; i++ ) {
				postListeners[i].onPostRecreateCollection( postEvent );
			}
		}
	}
}