com.carlos.projects.billing.dao.hibernate.HibernateDAO.java Source code

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Here is the source code for com.carlos.projects.billing.dao.hibernate.HibernateDAO.java

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/**
 * Fonti is a web application for billing and budgeting
 * Copyright (C) 2009  Carlos Fernandez
 *
 * This file is part of Fonti.
 *
 * Fonti 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.
 *
 * Fonti 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 com.carlos.projects.billing.dao.hibernate;

import com.carlos.projects.billing.dao.DAO;
import org.hibernate.Session;
import org.hibernate.SessionFactory;

import java.io.Serializable;
import java.util.List;

/**
 * Contains common logic for Hibernate-based Data Access Objects.
 *
 * @author Carlos Fernandez
 * @date 15-Nov-2009
 */
public abstract class HibernateDAO<T, ID extends Serializable> implements DAO<T, ID> {

    private SessionFactory sessionFactory;

    public HibernateDAO() {
    }

    public HibernateDAO(SessionFactory hibernateSessionFactory) {
        this.sessionFactory = hibernateSessionFactory;
    }

    protected Session getSession() {
        return sessionFactory.getCurrentSession();
    }

    public T getById(Class<T> clazz, Serializable id) {
        if (id == null) {
            return null;
        } else {
            return (T) getSession().get(clazz, id);
        }
    }

    public ID save(T entity) {
        Session session = getSession();
        ID id = (ID) session.save(entity);
        session.flush();
        return id;
    }

    public void saveOrUpdate(T entity) {
        Session session = getSession();
        session.saveOrUpdate(entity);
    }

    public void update(T entity) {
        Session session = getSession();
        session.update(entity);
    }

    public List<T> findAll(String entityName) {
        return (List<T>) getSession().createQuery("from " + entityName).list();
    }

}