package util;

import org.hibernate.cfg.Configuration;
import org.hibernate.SessionFactory;

import org.apache.log4j.Logger;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Level;
import org.apache.log4j.spi.LoggerRepository;
import org.apache.log4j.FileAppender;
import org.apache.log4j.SimpleLayout;
import org.apache.log4j.PropertyConfigurator;

public class HibernateUtil {
    
    private static final SessionFactory sessionFactory;
    
    static Logger logger = Logger.getLogger("util.HibernateUtil");

    public static SessionFactory getSessionFactory(){
        return sessionFactory;
    }
    
    static {
        try{
            BasicConfigurator.configure();
            logger.info("Create Configuration");
            Configuration cfg=new Configuration();
            logger.info("OK");
            logger.info("connigure");
            cfg.configure();
            logger.info("OK");
            logger.info("buildSessionFactory");
            sessionFactory=cfg.buildSessionFactory();
            logger.info("OK");
            
        }
        catch(Throwable ex)
        {
            System.err.println(ex);
            throw new ExceptionInInitializerError(ex);
        }
    }
    
}

package events;

import org.hibernate.Session;
import util.HibernateUtil;
import java.util.Date;
import java.util.List;
import java.util.Set;

public class EventManager {    
    
    public EventManager(){}
    
    private void createAndStoreEvent(String title,Date theDate)
    {        
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();        
        session.beginTransaction();        
            Event theEvent = new Event();
            theEvent.setTitle(title);
            theEvent.setDate(new Date());        
        session.save(theEvent);
        session.getTransaction().commit();
    }
    
    private void addEmailToPerson(Long personId,String emailAddress)
    {
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();        
        session.beginTransaction();        
            Person aPerson = (Person)session.load(Person.class,personId);            
            aPerson.getEmailAdresses().add(emailAddress);        
        session.getTransaction().commit();
    }
    
    public void addPersonToEvent(Long personId,Long eventId)    
    {
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();        
        session.beginTransaction();        
            Person aPerson = (Person)session.load(Person.class,personId);
            Event  anEvent = (Event)session.load(Event.class,eventId);                           
        aPerson.getEvents().add(anEvent);        
        session.getTransaction().commit();
    }
    
    public List listEvents()
    {        
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();        
        session.beginTransaction();        
        List result = session.createQuery("from Event").list();        
        session.getTransaction().commit();        
        return result;        
    }
    
    public static void main(String[] args)
    {
        EventManager mgr=new EventManager();
        if (args[ 0 ].equals("store")) {
            mgr.createAndStoreEvent("My Event",new Date());
        }        
        if (args[ 0 ].equals("list")){
            List events = mgr.listEvents();
            for(int i= 0 ;i<events.size();i++){
                Event theEvent = (Event)events.get(i);
            }
        }
        HibernateUtil.getSessionFactory().close();
    }   
    
}