package org.hibernate.envers.query.impl;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.envers.configuration.AuditConfiguration;
import org.hibernate.envers.configuration.AuditEntitiesConfiguration;
import org.hibernate.envers.query.criteria.AuditCriterion;
import org.hibernate.envers.reader.AuditReaderImplementor;
/**
* In comparison to {@link EntitiesAtRevisionQuery} this query returns an empty collection if an entity
* of a certain type has not been changed in a given revision.
* @see EntitiesAtRevisionQuery
* @author Lukasz Antoniak (lukasz dot antoniak at gmail dot com)
*/
public class EntitiesModifiedAtRevisionQuery extends AbstractAuditQuery {
private final Number revision;
public EntitiesModifiedAtRevisionQuery(AuditConfiguration verCfg, AuditReaderImplementor versionsReader,
Class<?> cls, Number revision) {
super(verCfg, versionsReader, cls);
this.revision = revision;
}
public EntitiesModifiedAtRevisionQuery(AuditConfiguration verCfg, AuditReaderImplementor versionsReader,
Class<?> cls, String entityName, Number revision) {
super(verCfg, versionsReader, cls, entityName);
this.revision = revision;
}
@SuppressWarnings({"unchecked"})
public List list() {
/*
* The query that we need to create:
* SELECT new list(e) FROM versionsReferencedEntity e
* WHERE
* (all specified conditions, transformed, on the "e" entity) AND
* e.revision = :revision
*/
AuditEntitiesConfiguration verEntCfg = verCfg.getAuditEntCfg();
String revisionPropertyPath = verEntCfg.getRevisionNumberPath();
qb.getRootParameters().addWhereWithParam(revisionPropertyPath, "=", revision);
// all specified conditions
for (AuditCriterion criterion : criterions) {
criterion.addToQuery(verCfg, entityName, qb, qb.getRootParameters());
}
Query query = buildQuery();
List queryResult = query.list();
if (hasProjection) {
return queryResult;
} else {
List result = new ArrayList();
entityInstantiator.addInstancesFromVersionsEntities(entityName, result, queryResult, revision);
return result;
}
}
}