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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.event.internal;

import java.io.Serializable;

import org.hibernate.LockMode;
import org.hibernate.engine.internal.Versioning;
import org.hibernate.engine.spi.EntityEntry;
import org.hibernate.engine.spi.EntityKey;
import org.hibernate.engine.spi.PersistenceContext;
import org.hibernate.engine.spi.Status;
import org.hibernate.event.spi.AbstractEvent;
import org.hibernate.event.spi.EventSource;
import org.hibernate.internal.CoreLogging;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.pretty.MessageHelper;
import org.hibernate.type.TypeHelper;

import org.jboss.logging.Logger;

/**
 * A convenience base class for listeners that respond to requests to reassociate an entity
 * to a session ( such as through lock() or update() ).
 *
 * @author Gavin King
 */
public abstract class AbstractReassociateEventListener implements Serializable {
	private static final Logger log = CoreLogging.logger( AbstractReassociateEventListener.class );

	/**
	 * Associates a given entity (either transient or associated with another session) to
	 * the given session.
	 *
	 * @param event The event triggering the re-association
	 * @param object The entity to be associated
	 * @param id The id of the entity.
	 * @param persister The entity's persister instance.
	 *
	 * @return An EntityEntry representing the entity within this session.
	 */
	protected final EntityEntry reassociate(AbstractEvent event, Object object, Serializable id, EntityPersister persister) {

		if ( log.isTraceEnabled() ) {
			log.tracev(
					"Reassociating transient instance: {0}",
					MessageHelper.infoString( persister, id, event.getSession().getFactory() )
			);
		}

		final EventSource source = event.getSession();
		final EntityKey key = source.generateEntityKey( id, persister );

		final PersistenceContext persistenceContext = source.getPersistenceContext();
		persistenceContext.checkUniqueness( key, object );

		//get a snapshot
		Object[] values = persister.getPropertyValues( object );
		TypeHelper.deepCopy(
				values,
				persister.getPropertyTypes(),
				persister.getPropertyUpdateability(),
				values,
				source
		);
		Object version = Versioning.getVersion( values, persister );

		EntityEntry newEntry = persistenceContext.addEntity(
				object,
				( persister.isMutable() ? Status.MANAGED : Status.READ_ONLY ),
				values,
				key,
				version,
				LockMode.NONE,
				true,
				persister,
				false
		);

		new OnLockVisitor( source, id, object ).process( object, persister );

		persister.afterReassociate( object, source );

		return newEntry;

	}
}