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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.query;
import org.hibernate.Incubating;
import org.hibernate.envers.boot.internal.EnversService;
import org.hibernate.envers.exception.NotAuditedException;
import org.hibernate.envers.internal.reader.AuditReaderImplementor;
import org.hibernate.envers.query.internal.impl.EntitiesAtRevisionQuery;
import org.hibernate.envers.query.internal.impl.EntitiesModifiedAtRevisionQuery;
import org.hibernate.envers.query.internal.impl.RevisionsOfEntityQuery;
import static org.hibernate.envers.internal.tools.ArgumentsTools.checkNotNull;
import static org.hibernate.envers.internal.tools.ArgumentsTools.checkPositive;
import static org.hibernate.envers.internal.tools.EntityTools.getTargetClassIfProxied;
/**
* @author Adam Warski (adam at warski dot org)
* @author HernпїЅn Chanfreau
* @author Lukasz Antoniak (lukasz dot antoniak at gmail dot com)
* @author Chris Cranford
*/
public class AuditQueryCreator {
private final EnversService enversService;
private final AuditReaderImplementor auditReaderImplementor;
public AuditQueryCreator(EnversService enversService, AuditReaderImplementor auditReaderImplementor) {
this.enversService = enversService;
this.auditReaderImplementor = auditReaderImplementor;
}
/**
* Creates a query, which will return entities satisfying some conditions (specified later),
* at a given revision. Deleted entities are not included.
*
* @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" );
c = getTargetClassIfProxied( c );
checkEntityAudited( c.getName() );
return new EntitiesAtRevisionQuery( enversService, auditReaderImplementor, c, revision, false );
}
/**
* Creates a query, which will return entities satisfying some conditions (specified later),
* at a given revision and a given entityName. Deleted entities are not included.
*
* @param c Class of the entities for which to query.
* @param entityName Name of the entity (if it can't be guessed basing on the {@code c}).
* @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, String entityName, Number revision) {
return forEntitiesAtRevision( c, entityName, revision, false );
}
/**
* Creates a query, which will return entities satisfying some conditions (specified later),
* at a given revision and a given entityName. Deleted entities may be optionally
* included.
*
* @param c Class of the entities for which to query.
* @param entityName Name of the entity (if it can't be guessed basing on the {@code c}).
* @param revision Revision number at which to execute the query.
* @param includeDeletions Whether to include deleted entities in the search.
*
* @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, String entityName, Number revision, boolean includeDeletions) {
checkNotNull( revision, "Entity revision" );
checkPositive( revision, "Entity revision" );
c = getTargetClassIfProxied( c );
checkEntityAudited( entityName );
return new EntitiesAtRevisionQuery(
enversService,
auditReaderImplementor,
c,
entityName,
revision,
includeDeletions
);
}
/**
* Creates a query, which will return entities modified at the specified revision.
*
* In comparison, the {@link #forEntitiesAtRevision(Class, String, Number)} query takes into all entities
* which were present at a given revision, even if they were not modified.
*
* @param c Class of the entities for which to query.
* @param entityName Name of the entity (if it can't be guessed basing on the {@code c}).
* @param revision Revision number at which to execute the query.
*
* @return A query for entities changed at a given revision, to which conditions can be added and which
* can then be executed.
*
* @see #forEntitiesAtRevision(Class, String, Number)
*/
public AuditQuery forEntitiesModifiedAtRevision(Class c, String entityName, Number revision) {
checkNotNull( revision, "Entity revision" );
checkPositive( revision, "Entity revision" );
c = getTargetClassIfProxied( c );
checkEntityAudited( entityName );
return new EntitiesModifiedAtRevisionQuery( enversService, auditReaderImplementor, c, entityName, revision );
}
/**
* Creates a query, which will return entities modified at the specified revision.
*
* In comparison, the {@link #forEntitiesAtRevision(Class, String, Number)} query takes into all entities
* which were present at a given revision, even if they were not modified.
*
* @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 changed at a given revision, to which conditions can be added and which
* can then be executed.
*
* @see #forEntitiesAtRevision(Class, Number)
*/
public AuditQuery forEntitiesModifiedAtRevision(Class c, Number revision) {
checkNotNull( revision, "Entity revision" );
checkPositive( revision, "Entity revision" );
c = getTargetClassIfProxied( c );
checkEntityAudited( c.getName() );
return new EntitiesModifiedAtRevisionQuery( enversService, 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:
*
* - the entity instance
* - 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}
* - type of the revision (an enum instance of class {@link org.hibernate.envers.RevisionType})
*
* 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 entities 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 c), 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) {
c = getTargetClassIfProxied( c );
checkEntityAudited( c.getName() );
return new RevisionsOfEntityQuery(
enversService,
auditReaderImplementor,
c,
selectEntitiesOnly,
selectDeletedEntities,
false,
false
);
}
/**
* Creates a query, which selects the revisions, at which the given entity was modified and with a given entityName.
* Unless an explicit projection is set, the result will be a list of three-element arrays, containing:
*
* - the entity instance
* - 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}
* - type of the revision (an enum instance of class {@link org.hibernate.envers.RevisionType})
*
* Additional conditions that the results must satisfy may be specified.
*
* @param c Class of the entities for which to query.
* @param entityName Name of the entity (if it can't be guessed basing on the {@code c}).
* @param selectEntitiesOnly If true, instead of a list of three-element arrays, a list of entities 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 c), 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,
String entityName,
boolean selectEntitiesOnly,
boolean selectDeletedEntities) {
c = getTargetClassIfProxied( c );
checkEntityAudited( entityName );
return new RevisionsOfEntityQuery(
enversService,
auditReaderImplementor,
c,
entityName,
selectEntitiesOnly,
selectDeletedEntities,
false,
false
);
}
/**
* Creates a query that selects the revision entities associated with the specified entity. You may also
* specify whether the revision entities list should include those for deletions of the entity class.
*
* @param clazz Class of the entities for which to query.
* @param selectDeletedEntities If true, the result will include revision entities where deletions occurred.
*
* @return A query of revision entities based on the specified entity class. The results of the query will
* be stored in ascending order by the revision number unless an order is specified.
*
* @since 5.3
*/
@Incubating
public AuditQuery forRevisionsOfEntity(Class clazz, boolean selectDeletedEntities) {
clazz = getTargetClassIfProxied( clazz );
return new RevisionsOfEntityQuery(
enversService,
auditReaderImplementor,
clazz,
false,
selectDeletedEntities,
true,
false
);
}
/**
* Creates a query that selects the revision entities associated with the specified entity. You may also
* specify whether the revision entities list should include those for deletions of the entity class.
*
* @param clazz Class of the entities for which to query.
* @param entityName Name of the entity (for cases where it cannot be guessed based on class clazz).
* @param selectDeletedEntities If true, the result will include revision entities where deletions occurred.
*
* @return A query of revision entities based on the specified entity class. The results of the query will
* be stored in ascending order by the revision number unless an order is specified.
*
* @since 5.3
*/
@Incubating
public AuditQuery forRevisionsOfEntity(Class clazz, String entityName, boolean selectDeletedEntities) {
clazz = getTargetClassIfProxied( clazz );
return new RevisionsOfEntityQuery(
enversService,
auditReaderImplementor,
clazz,
entityName,
false,
selectDeletedEntities,
true,
false
);
}
/**
* Creates a query that selects the revisions at which the given entity was modified. Unless a
* projection is set, the result will be a list of 4-element arrays, containing the following:
*
* - The entity instance
* - Revision entity, corresponding to the revision where the entity was modified. If no custom
* revision entity is used, this will be an instance of {@link org.hibernate.envers.DefaultRevisionEntity}.
* - The revision type, an enum of class {@link org.hibernate.envers.RevisionType}.
* - The names of the properties changed in this revision
*
* Additional criterion may be specified to filter the result set.
*
* @param clazz Class of the entities for which to query.
* @param selectDeletedEntities If true, the result set will include revisions where entities were deleted.
*
* @return the audit query
*
* @since 5.3
*/
@Incubating
public AuditQuery forRevisionsOfEntityWithChanges(Class clazz, boolean selectDeletedEntities) {
clazz = getTargetClassIfProxied( clazz );
return new RevisionsOfEntityQuery(
enversService,
auditReaderImplementor,
clazz,
false,
selectDeletedEntities,
false,
true
);
}
/**
* Creates a query that selects the revisions at which the given entity was modified. Unless a
* projection is set, the result will be a list of 4-element arrays, containing the following:
*
* - The entity instance
* - Revision entity, corresponding to the revision where the entity was modified. If no custom
* revision entity is used, this will be an instance of {@link org.hibernate.envers.DefaultRevisionEntity}.
* - The revision type, an enum of class {@link org.hibernate.envers.RevisionType}.
* - The names of the properties changed in this revision
*
* Additional criterion may be specified to filter the result set.
*
* @param clazz Class of the entities for which to query.
* @param entityName Name of the entity (if it can't be guessed basing on the {@code clazz}).
* @param selectDeletedEntities If true, the result set will include revisions where entities were deleted.
*
* @return the audit query
*
* @since 5.3
*/
@Incubating
public AuditQuery forRevisionsOfEntityWithChanges(Class clazz, String entityName, boolean selectDeletedEntities) {
clazz = getTargetClassIfProxied( clazz );
return new RevisionsOfEntityQuery(
enversService,
auditReaderImplementor,
clazz,
entityName,
false,
selectDeletedEntities,
false,
true
);
}
private void checkEntityAudited(String entityName) {
if ( !auditReaderImplementor.isEntityNameAudited( entityName ) ) {
throw new NotAuditedException(
entityName,
"Cannot query audit history on a non-audited entity [" + entityName + "]."
);
}
}
}