org.hibernate.envers.query
Class AuditQueryCreator

java.lang.Object
  org.hibernate.envers.query.AuditQueryCreator

public class AuditQueryCreator
extends Object

Author:

Adam Warski (adam at warski dot org)

Constructor Summary

AuditQueryCreator(AuditConfiguration auditCfg, AuditReaderImplementor auditReaderImplementor)

Method Summary

AuditQuery	forEntitiesAtRevision(Class<?> c, Number revision) Creates a query, which will return entities satisfying some conditions (specified later), at a given revision.
AuditQuery	forRevisionsOfEntity(Class<?> c, boolean selectEntitiesOnly, boolean selectDeletedEntities) Creates a query, which selects the revisions, at which the given entity was modified.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AuditQueryCreator

public AuditQueryCreator(AuditConfiguration auditCfg,
                         AuditReaderImplementor auditReaderImplementor)

Method Detail

forEntitiesAtRevision

public AuditQuery forEntitiesAtRevision(Class<?> c,
                                        Number revision)

Creates a query, which will return entities satisfying some conditions (specified later), at a given revision.

Parameters:

c - Class of the entities for which to query.

revision - Revision number at which to execute the query.

Returns:

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.

forRevisionsOfEntity

public AuditQuery forRevisionsOfEntity(Class<?> c,
                                       boolean selectEntitiesOnly,
                                       boolean selectDeletedEntities)

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:

1. the entity instance
2. 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 DefaultRevisionEntity
3. type of the revision (an enum instance of class RevisionType)
.

Additional conditions that the results must satisfy may be specified.

Parameters:

c - Class of the entities for which to query.

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.

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.

Returns:

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.