package cz.frantovo.nekurak.dao;

import cz.frantovo.nekurak.dto.Podnik;

import java.util.Collection;

import java.util.Date;

import javax.ejb.LocalBean;

import javax.ejb.Stateless;

import javax.persistence.EntityManager;

import javax.persistence.PersistenceContext;

import javax.persistence.Query;

/**

 *

 * @author fiki

 */

@Stateless

@LocalBean

public class PodnikDAO {

    private static final String PU = "nekurak.net-PU";

    @PersistenceContext(unitName = PU)

    private EntityManager em;

    public Collection<Podnik> getPodniky() {

	Query dotaz = em.createQuery("FROM " + t(Podnik.class) + " o ORDER BY datum DESC");

	return dotaz.getResultList();

    }

    public void uloz(Podnik p) {

	if (p.getDatum() == null) {

	    p.setDatum(new Date());

	}

	em.persist(p);

    }

    private static String t(Class trida) {

	return trida.getSimpleName();

    }

}