br.com.lsi.ordemservico.dao.DAOGeneric.java Source code

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Here is the source code for br.com.lsi.ordemservico.dao.DAOGeneric.java

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package br.com.lsi.ordemservico.dao;

import br.com.lsi.ordemservico.commom.exception.DAOException;
import br.com.lsi.ordemservico.interfac.IDAOGeneric;
import br.com.lsi.ordemservico.util.PersistenceUtil;
import java.lang.reflect.ParameterizedType;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.criterion.Restrictions;

/**
 *
 * @author Allan
 */
public class DAOGeneric<T> implements IDAOGeneric<T> {

    private Class classe;

    public DAOGeneric() {
        this.classe = (Class<T>) ((ParameterizedType) getClass().getGenericSuperclass())
                .getActualTypeArguments()[0];
    }

    @Override
    public void salvar(T t) throws DAOException {
        Session sessao = PersistenceUtil.getSessionFactory().openSession();
        try {
            sessao.getTransaction().begin();
            sessao.save(t);
            sessao.getTransaction().commit();
        } catch (Exception e) {
            sessao.getTransaction().rollback();
            e.printStackTrace();
            throw new DAOException("Erro ao Salvar no BD");
        } finally {
            sessao.close();
        }

    }

    @Override
    public void atualizar(T t) throws DAOException {
        Session sessao = PersistenceUtil.getSessionFactory().openSession();
        try {
            sessao.getTransaction().begin();
            sessao.update(t);
            sessao.getTransaction().commit();
        } catch (Exception e) {
            sessao.getTransaction().rollback();
            e.printStackTrace();
            throw new DAOException("Erro ao Atualizar no BD");
        } finally {
            sessao.close();
        }
    }

    @Override
    public void deletar(T t) throws DAOException {
        Session sessao = PersistenceUtil.getSessionFactory().openSession();
        try {
            sessao.getTransaction().begin();
            sessao.delete(t);
            sessao.getTransaction().commit();
        } catch (Exception e) {
            sessao.getTransaction().rollback();
            e.printStackTrace();
            throw new DAOException("Erro ao Deletar no BD");
        } finally {
            sessao.close();
        }
    }

    @Override
    public T getById(Long id) throws DAOException {
        T t = null;
        Session sessao = PersistenceUtil.getSessionFactory().openSession();
        try {
            // sessao.getTransaction().begin();
            Criteria criteria = sessao.createCriteria(classe);
            criteria.add(Restrictions.eq("id", id));
            t = (T) criteria.uniqueResult();

        } catch (Exception e) {
            e.printStackTrace();
            throw new DAOException("Erro ao buscar por ID no BD");
        } finally {
            sessao.close();
        }
        return t;

    }

    @Override
    public List<T> getAll() throws DAOException {
        List<T> lista = null;
        Session sessao = PersistenceUtil.getSessionFactory().openSession();
        try {
            sessao.getTransaction().begin();
            Criteria criteria = sessao.createCriteria(classe);
            lista = criteria.list();
        } catch (Exception e) {
            e.printStackTrace();
            throw new DAOException("Erro ao buscar listar no BD");
        } finally {
            sessao.close();
        }
        return lista;
    }

}