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/*******************************************************************************
* Copyright (c) 2006-2011 Gluster, Inc. <http://www.gluster.com>
* This file is part of Gluster Management Gateway.
*
* Gluster Management Gateway is free software; you can redistribute
* it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* Gluster Management Gateway 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*******************************************************************************/
package org.gluster.storage.management.gateway.data;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.PersistenceUnit;
import javax.persistence.Query;
/**
*
*/
public class PersistenceDao<T> {
private Class<T> type;
private EntityManager entityManager;
@PersistenceUnit
private EntityManagerFactory entityManagerFactory;
public PersistenceDao(Class<T> type) {
this.type = type;
}
public EntityTransaction startTransaction() {
EntityTransaction txn = getEntityManager().getTransaction();
txn.begin();
return txn;
}
private synchronized EntityManager getEntityManager() {
if (entityManager == null) {
entityManager = entityManagerFactory.createEntityManager();
}
return entityManager;
}
public Object getSingleResult(String query) {
return getEntityManager().createQuery(query).getSingleResult();
}
public Object getSingleResult(String queryString, String... params) {
return createQuery(queryString, params).getSingleResult();
}
private Query createQuery(String queryString, String... params) {
Query query = getEntityManager().createQuery(queryString);
for (int i = 0; i < params.length; i++) {
query.setParameter(i + 1, params[i]);
}
return query;
}
public Object getSingleResultFromSQL(String sqlQuery) {
return getEntityManager().createNativeQuery(sqlQuery).getSingleResult();
}
@SuppressWarnings("rawtypes")
public List findBySQL(String sqlQuery) {
return getEntityManager().createNativeQuery(sqlQuery).getResultList();
}
public T findById(int id) {
return getEntityManager().find(type, id);
}
public List<T> findAll() {
return getEntityManager().createQuery("select t from " + type.getName() + " t").getResultList();
}
public List<T> findBy(String whereClause) {
return getEntityManager().createQuery("select t from " + type.getName() + " t where " + whereClause)
.getResultList();
}
public List<T> findBy(String whereClause, String... params) {
return createQuery("select t from " + type.getName() + " t where " + whereClause, params).getResultList();
}
public void save(Object obj) {
getEntityManager().persist(obj);
}
public T update(T obj) {
return getEntityManager().merge(obj);
}
public void delete(Object obj) {
getEntityManager().remove(obj);
}
}
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