org.jboss.envers.query
Class VersionsQueryCreator

java.lang.Object
  org.jboss.envers.query.VersionsQueryCreator

public class VersionsQueryCreator
extends java.lang.Object

Author:

Adam Warski (adam at warski dot org)

Constructor Summary

VersionsQueryCreator(org.jboss.envers.reader.VersionsReaderImplementor versionsReaderImplementor)

Method Summary

VersionsQuery	forEntitiesAtRevision(java.lang.Class<?> c, java.lang.Number revision) Creates a query, which will return entities satisfying some conditions (specified later), at a given revision.
VersionsQuery	forRevisionsOfEntity(java.lang.Class<?> c, boolean selectEntitiesOnly) Creates a query, which will return a list of two-element arrays, containing the entity instance and the number of the revision (unless a projection is set), at which instances of the given entity were modified, and which satisfy some conditions.

Methods inherited from class java.lang.Object

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

Constructor Detail

VersionsQueryCreator

public VersionsQueryCreator(org.jboss.envers.reader.VersionsReaderImplementor versionsReaderImplementor)

Method Detail

forEntitiesAtRevision

public VersionsQuery forEntitiesAtRevision(java.lang.Class<?> c,
                                           java.lang.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 VersionsQuery forRevisionsOfEntity(java.lang.Class<?> c,
                                          boolean selectEntitiesOnly)

Creates a query, which will return a list of two-element arrays, containing the entity instance and the number of the revision (unless a projection is set), at which instances of the given entity were modified, and which satisfy some conditions.

Parameters:

c - Class of the entities for which to query.

selectEntitiesOnly - If true, instead of a list of two-element arrays, a list of entites will be returned as a result of executing this query.

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.