/**
* Returns an entity in the given revision for the given entity-id.
*
* @param revisionNumber
* @param id
* @param reader
* @return
*/
@SuppressWarnings("unchecked")
private Revision<N, T> getEntityForRevision(N revisionNumber, ID id, AuditReader reader) {
Class<?> type = revisionEntityInformation.getRevisionEntityClass();
T revision = (T) reader.findRevision(type, revisionNumber);
Object entity = reader.find(entityInformation.getJavaType(), id, revisionNumber);
return new Revision<N, T>((RevisionMetadata<N>) getRevisionMetadata(revision), (T) entity);
}
/**
* Returns the entities in the given revisions for the entitiy with the given id.
*
* @param revisionNumbers
* @param id
* @param reader
* @return
*/
@SuppressWarnings("unchecked")
private Revisions<N, T> getEntitiesForRevisions(
List<N> revisionNumbers, ID id, AuditReader reader) {
Class<T> type = entityInformation.getJavaType();
Map<N, T> revisions = new HashMap<N, T>(revisionNumbers.size());
Class<?> revisionEntityClass = revisionEntityInformation.getRevisionEntityClass();
Map<Number, Object> revisionEntities =
(Map<Number, Object>)
reader.findRevisions(revisionEntityClass, new HashSet<Number>(revisionNumbers));
for (Number number : revisionNumbers) {
revisions.put((N) number, reader.find(type, id, number));
}
return new Revisions<N, T>(toRevisions(revisions, revisionEntities));
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.history.RevisionRepository#findLastChangeRevision(java.io.Serializable)
*/
@SuppressWarnings("unchecked")
public Revision<N, T> findLastChangeRevision(ID id) {
Class<T> type = entityInformation.getJavaType();
AuditReader reader = AuditReaderFactory.get(entityManager);
List<Number> revisions = reader.getRevisions(type, id);
if (revisions.isEmpty()) {
return null;
}
N latestRevision = (N) revisions.get(revisions.size() - 1);
Class<?> revisionEntityClass = revisionEntityInformation.getRevisionEntityClass();
Object revisionEntity = reader.findRevision(revisionEntityClass, latestRevision);
RevisionMetadata<N> metadata = (RevisionMetadata<N>) getRevisionMetadata(revisionEntity);
return new Revision<N, T>(metadata, reader.find(type, id, latestRevision));
}