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Hibernate's entity version (audit/history) support
/*
* 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.envers.internal.entities.mapper.relation;
import java.io.Serializable;
import org.hibernate.envers.boot.internal.EnversService;
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,
EnversService enversService) {
if ( enversService.getEntitiesConfigurations().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,
EnversService enversService) {
final EntityPersister persister = versionsReader.getSessionImplementor()
.getFactory()
.getMetamodel()
.entityPersister( entityName );
return persister.createProxy(
(Serializable) entityId,
new ToOneDelegateSessionImplementor( versionsReader, entityClass, entityId, revision, removed, enversService )
);
}
/**
* 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,
EnversService enversService) {
final EntityPersister persister = versionsReader.getSessionImplementor()
.getFactory()
.getMetamodel()
.entityPersister( entityName );
if ( persister.hasProxy() ) {
return createProxy( versionsReader, entityClass, entityName, entityId, revision, removed, enversService );
}
return loadImmediate( versionsReader, entityClass, entityName, entityId, revision, removed, enversService );
}
}