com.plan.proyecto.repositorios.DaoGenericoImpl.java Source code

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Here is the source code for com.plan.proyecto.repositorios.DaoGenericoImpl.java

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package com.plan.proyecto.repositorios;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

/**
 *
 * @author Administrador
 */
@Repository
@Transactional
public class DaoGenericoImpl<T, Long> implements DaoGenerico<T, Long> {

    @PersistenceContext
    EntityManager em;

    private Class<T> persistentClass;

    @SuppressWarnings("unchecked")
    public DaoGenericoImpl() {
        //        Type t = getClass().getGenericSuperclass();
        //        ParameterizedType pt = (ParameterizedType) t;
        //        persistentClass = (Class) pt.getActualTypeArguments()[0];

        Type type = this.getClass().getGenericSuperclass();

        if (type instanceof ParameterizedType) {
            ParameterizedType pt = (ParameterizedType) type;
            Type[] fieldArgTypes = pt.getActualTypeArguments();
            persistentClass = (Class<T>) fieldArgTypes[0];
        }
    }

    @Override
    public T insertar(T t) {
        em.persist(t);
        return t;
    }

    @Override
    public T eliminar(T t) {
        T uno = em.merge(t);
        em.remove(t);
        return t;
    }

    @Override
    public void eliminarById(Long id) {
        em.remove(id);
    }

    @Override
    public T modificar(T t) {
        return em.merge(t);
    }

    @Override
    public T findById(Long id) {
        return em.find(persistentClass, id);
    }

}