/**
* Copyright (C) 2011 JTalks.org Team
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.jtalks.jcommune.model.dao.hibernate;
import java.util.List;
import org.hibernate.SessionFactory;
import org.hibernate.criterion.Restrictions;
import org.hibernate.criterion.SimpleExpression;
import org.jtalks.common.model.entity.Entity;
import org.jtalks.jcommune.model.dao.ValidatorDao;
/**
* Performs simple checks in a database for the sake of validation.
* This implementation supports only string params for simplicity
*
* @author Evgeniy Naumenko
*/
public class ValidatorHibernateDao implements ValidatorDao<String> {
private SessionFactory sessionFactory;
/**
* @param sessionFactory to obtain current hibernate session
*/
public ValidatorHibernateDao(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
/**
* {@inheritDoc}
*/
@Override
public boolean isResultSetEmpty(Class<? extends Entity> entity, String field,
String param, boolean ignoreCase) {
return getResultSet(entity, field, param, ignoreCase).isEmpty();
}
/**
* {@inheritDoc}
*/
@Override
public boolean isExists(Class<? extends Entity> entity, String field,
String param, boolean ignoreCase) {
List<?> resultSet = getResultSet(entity, field, param, ignoreCase);
if (resultSet.isEmpty()) {
return false;
} else if (resultSet.size() == 1 || !ignoreCase) {
return true;
} else {
return !sessionFactory
.getCurrentSession()
.createCriteria(entity)
.add(Restrictions.eq(field, param))
.setCacheable(true)
.list()
.isEmpty();
}
}
private List<?> getResultSet(Class<? extends Entity> entity, String field,
String param, boolean ignoreCase) {
SimpleExpression fieldRestriction = Restrictions.eq(field, param);
if (ignoreCase) {
fieldRestriction = fieldRestriction.ignoreCase();
}
return sessionFactory
.getCurrentSession()
.createCriteria(entity)
.add(fieldRestriction)
.setCacheable(true)
.list();
}
}