HBDAO.java

package br.com.itexto.springforum.dao.hibernate;

import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import br.com.itexto.springforum.dao.DAOBase;

@Transactional(propagation=Propagation.SUPPORTS)
public abstract class HBDAO<T> implements DAOBase<T> {

	@Autowired
	private SessionFactory sessionFactory;
	
	
	
	public SessionFactory getSessionFactory() {
		return sessionFactory;
	}

	public void setSessionFactory(SessionFactory sessionFactory) {
		this.sessionFactory = sessionFactory;
	}

	protected Session getSession(){
		return getSessionFactory().getCurrentSession();
	}
	
	public List<T> list(int offset, int max) {
		 return (List<T>) getSession().createCriteria(getClazz()).setMaxResults(max).
					setFirstResult(offset).list();
	}

	public void persist(T objeto) {
		getSession().saveOrUpdate(objeto);
	}

	public void excluir(T objeto) {
		getSession().delete(objeto);
	}

	public T get(Long id) {
		return (T) getSession().get( getClazz(), id);
	}

	protected abstract Class getClazz() ;

}