/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.envers.query.criteria;
import org.hibernate.envers.configuration.AuditConfiguration;
import org.hibernate.envers.entities.RelationDescription;
import org.hibernate.envers.tools.query.Parameters;
import org.hibernate.envers.tools.query.QueryBuilder;
import org.hibernate.envers.query.property.PropertyNameGetter;
/**
* @author Adam Warski (adam at warski dot org)
*/
public class NullAuditExpression implements AuditCriterion {
private PropertyNameGetter propertyNameGetter;
public NullAuditExpression(PropertyNameGetter propertyNameGetter) {
this.propertyNameGetter = propertyNameGetter;
}
public void addToQuery(AuditConfiguration auditCfg, String entityName, QueryBuilder qb, Parameters parameters) {
String propertyName = propertyNameGetter.get(auditCfg);
RelationDescription relatedEntity = CriteriaTools.getRelatedEntity(auditCfg, entityName, propertyName);
if (relatedEntity == null) {
parameters.addNullRestriction(propertyName, true);
} else {
relatedEntity.getIdMapper().addIdEqualsToQuery(parameters, null, null, true);
}
}
}