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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2013, Red Hat Inc. 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 Inc.
*
* 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.envers.internal.entities.mapper.relation;
import java.io.Serializable;
import org.hibernate.envers.configuration.spi.AuditConfiguration;
import org.hibernate.envers.internal.entities.mapper.relation.lazy.ToOneDelegateSessionImplementor;
import org.hibernate.envers.internal.reader.AuditReaderImplementor;
import org.hibernate.persister.entity.EntityPersister;
/**
* @author Lukasz Antoniak (lukasz dot antoniak at gmail dot com)
*/
public final class ToOneEntityLoader {
private ToOneEntityLoader() {
}
/**
* Immediately loads historical entity or its current state when excluded from audit process. Returns {@code null}
* reference if entity has not been found in the database.
*/
public static Object loadImmediate(
AuditReaderImplementor versionsReader,
Class entityClass,
String entityName,
Object entityId,
Number revision,
boolean removed,
AuditConfiguration verCfg) {
if ( verCfg.getEntCfg().getNotVersionEntityConfiguration( entityName ) == null ) {
// Audited relation, look up entity with Envers.
// When user traverses removed entities graph, do not restrict revision type of referencing objects
// to ADD or MOD (DEL possible). See HHH-5845.
return versionsReader.find( entityClass, entityName, entityId, revision, removed );
}
else {
// Not audited relation, look up entity with Hibernate.
return versionsReader.getSessionImplementor().immediateLoad( entityName, (Serializable) entityId );
}
}
/**
* Creates proxy of referenced *-to-one entity.
*/
public static Object createProxy(
AuditReaderImplementor versionsReader,
Class entityClass,
String entityName,
Object entityId,
Number revision,
boolean removed,
AuditConfiguration verCfg) {
final EntityPersister persister = versionsReader.getSessionImplementor()
.getFactory()
.getEntityPersister( entityName );
return persister.createProxy(
(Serializable) entityId,
new ToOneDelegateSessionImplementor( versionsReader, entityClass, entityId, revision, removed, verCfg )
);
}
/**
* Creates Hibernate proxy or retrieves the complete object of an entity if proxy is not
* allowed (e.g. @Proxy(lazy=false), final class).
*/
public static Object createProxyOrLoadImmediate(
AuditReaderImplementor versionsReader,
Class entityClass,
String entityName,
Object entityId,
Number revision,
boolean removed,
AuditConfiguration verCfg) {
final EntityPersister persister = versionsReader.getSessionImplementor()
.getFactory()
.getEntityPersister( entityName );
if ( persister.hasProxy() ) {
return createProxy( versionsReader, entityClass, entityName, entityId, revision, removed, verCfg );
}
return loadImmediate( versionsReader, entityClass, entityName, entityId, revision, removed, verCfg );
}
}
