br.ufg.inf.es.fs.contpatri.persistencia.dao.GenericDAOImpl.java Source code

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/**
 * Esse documento  parte do cdigo fonte e artefatos relacionados ao projeto
 * CONTPATRI, em desenvolvimento pela Fbrica de Software da UFG.
 *
 * Links relevantes: Fbrica de Software: http://fs.inf.ufg.br/ Instituto de
 * Informtica UFG: http://www.inf.ufg.br Projeto CONTPATRI DROPBOX:
 * https://www.dropbox.com/home/CONTPATRI%20-%20012013 Projeto CONTPATRI
 * REDMINE:
 *
 * Copyleft  UFG.
 *
 * Licenciado sobre a licena GNU-GPL v3
 *
 * Voc pode obter uma cpia da licena em http://www.gnu.org/licenses/gpl.html
 *
 * A menos que especificado ou exigido por legislao local, o software 
 * fornecido "da maneira que est", sem garantias ou condies de qualquer tipo,
 * nem expressas nem implcitas. Em caso de dvidas referir a licena GNU-GPL.
 */
package br.ufg.inf.es.fs.contpatri.persistencia.dao;

import br.ufg.inf.es.fs.contpatri.persistencia.HibernateUtil;
import java.io.Serializable;
import java.util.List;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;

/**
 * Implementao genrica de operaes de persistncia no Hibernate.
 *
 * @author Guilherme de Paula <guilherme.p.pereira at gmail.com>
 */
abstract class GenericDAOImpl<T, ID extends Serializable> implements GenericDAO<T, ID> {

    protected Session getSession() {
        return HibernateUtil.getSession();
    }

    @Override
    public void create(T entity) {
        try {
            HibernateUtil.beginTransaction();
            Session hibernateSession = this.getSession();
            hibernateSession.save(entity);
            HibernateUtil.commitTransaction();
        } catch (HibernateException e) {
            HibernateUtil.rollbackTransaction();
            throw e;
        }
    }

    @Override
    public void update(T entity) {
        try {
            HibernateUtil.beginTransaction();
            Session hibernateSession = this.getSession();
            hibernateSession.update(entity);
            HibernateUtil.commitTransaction();
        } catch (HibernateException e) {
            HibernateUtil.rollbackTransaction();
            throw e;
        }
    }

    @Override
    public void merge(T entity) {
        try {
            HibernateUtil.beginTransaction();
            Session hibernateSession = this.getSession();
            hibernateSession.merge(entity);
            HibernateUtil.commitTransaction();
        } catch (HibernateException e) {
            HibernateUtil.rollbackTransaction();
            throw e;
        }
    }

    @Override
    public void delete(T entity) {
        try {
            HibernateUtil.beginTransaction();
            Session hibernateSession = this.getSession();
            hibernateSession.delete(entity);
            HibernateUtil.commitTransaction();
        } catch (HibernateException e) {
            HibernateUtil.rollbackTransaction();
            throw e;
        }
    }

    @Override
    public T findOne(Query query) {
        T t;
        t = (T) query.uniqueResult();
        return t;
    }

    @Override
    public List<T> findMany(Query query) {
        List<T> t;
        t = (List<T>) query.list();
        return t;
    }

    public int rowCount(Class clazz) {
        Session hibernateSession = this.getSession();
        Query query = hibernateSession.createQuery("select count (*) from " + clazz.getName());
        return ((Long) query.list().get(0)).intValue();
    }

    @Override
    public T findByID(Class clazz, ID id) {
        HibernateUtil.beginTransaction();
        Session hibernateSession = this.getSession();
        T t = null;
        t = (T) hibernateSession.get(clazz, id);
        HibernateUtil.commitTransaction();
        return t;
    }

    @Override
    public List findAll(Class clazz) {
        HibernateUtil.beginTransaction();
        Session hibernateSession = this.getSession();
        List t = null;
        Query query = hibernateSession.createQuery("from " + clazz.getName());
        t = query.list();
        HibernateUtil.commitTransaction();
        return t;
    }
}