/*
* 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.envers.query;
import org.hibernate.envers.configuration.AuditConfiguration;
import org.hibernate.envers.query.impl.EntitiesAtRevisionQuery;
import org.hibernate.envers.query.impl.RevisionsOfEntityQuery;
import org.hibernate.envers.reader.AuditReaderImplementor;
import static org.hibernate.envers.tools.ArgumentsTools.checkNotNull;
import static org.hibernate.envers.tools.ArgumentsTools.checkPositive;
/**
* @author Adam Warski (adam at warski dot org)
*/
public class AuditQueryCreator {
private final AuditConfiguration auditCfg;
private final AuditReaderImplementor auditReaderImplementor;
public AuditQueryCreator(AuditConfiguration auditCfg, AuditReaderImplementor auditReaderImplementor) {
this.auditCfg = auditCfg;
this.auditReaderImplementor = auditReaderImplementor;
}
/**
* Creates a query, which will return entities satisfying some conditions (specified later),
* at a given revision.
* @param c Class of the entities for which to query.
* @param revision Revision number at which to execute the query.
* @return A query for entities at a given revision, to which conditions can be added and which
* can then be executed. The result of the query will be a list of entities (beans), unless a
* projection is added.
*/
public AuditQuery forEntitiesAtRevision(Class<?> c, Number revision) {
checkNotNull(revision, "Entity revision");
checkPositive(revision, "Entity revision");
return new EntitiesAtRevisionQuery(auditCfg, auditReaderImplementor, c, revision);
}
/**
* Creates a query, which selects the revisions, at which the given entity was modified.
* Unless an explicit projection is set, the result will be a list of three-element arrays, containing:
* <ol>
* <li>the entity instance</li>
* <li>revision entity, corresponding to the revision at which the entity was modified. If no custom
* revision entity is used, this will be an instance of {@link org.hibernate.envers.DefaultRevisionEntity}</li>
* <li>type of the revision (an enum instance of class {@link org.hibernate.envers.RevisionType})</li>.
* </ol>
* Additional conditions that the results must satisfy may be specified.
* @param c Class of the entities for which to query.
* @param selectEntitiesOnly If true, instead of a list of three-element arrays, a list of entites will be
* returned as a result of executing this query.
* @param selectDeletedEntities If true, also revisions where entities were deleted will be returned. The additional
* entities will have revision type "delete", and contain no data (all fields null), except for the id field.
* @return A query for revisions at which instances of the given entity were modified, to which
* conditions can be added (for example - a specific id of an entity of class <code>c</code>), and which
* can then be executed. The results of the query will be sorted in ascending order by the revision number,
* unless an order or projection is added.
*/
public AuditQuery forRevisionsOfEntity(Class<?> c, boolean selectEntitiesOnly, boolean selectDeletedEntities) {
return new RevisionsOfEntityQuery(auditCfg, auditReaderImplementor, c, selectEntitiesOnly,selectDeletedEntities);
}
}