DAOFactory Genérico

package com.checklist.dao;

import java.util.List;

import org.hibernate.Session;
import org.hibernate.Transaction;

import com.checklist.util.HibernateUtil;

public class DAOFactory<T> {

	private final Session session;

	private Transaction transaction;

	private Class<T> classe;
	
	@SuppressWarnings("unchecked")
	public DAOFactory(T u) {
		session = HibernateUtil.getSession();
		this.classe = (Class<T>) u.getClass();
	}

	public void beginTransaction() {
		this.transaction = this.session.beginTransaction();
	}

	private void save(T u) {
		this.session.save(u);
	}

	public void commit() {
		this.transaction.commit();
		this.transaction = null;
	}

	public boolean hasTransaction() {
		return this.transaction != null;
	}

	public void rollback() {
		this.transaction.rollback();
		this.transaction = null;
	}

	public void close() {
		this.session.close();
	}

	public DAOFactory<T> getGenericDAO() {
		try {
			return new DAOFactory<T>(this.classe.newInstance());
		} catch (InstantiationException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		}
		return null;
	}

	public void adiciona(T u) {
		beginTransaction();
		save(u);
		commit();
	}

	public void remove(T u) {
		this.session.delete(u);
	}

	public void atualiza(T u) {
		this.session.merge(u);
	}

	@SuppressWarnings("unchecked")
	public List<T> listaTudo() {
		return this.session.createCriteria(this.classe).list();
	}

	@SuppressWarnings("unchecked")
	public T procura(Long id) {
		return (T) session.load(this.classe, id);
	}
}