@Override
public Amount getAmountOfGoods(Goods goods) {
EntityManager em = emf.createEntityManager();
try {
return em.find(Goods.class, goods.getId()).getWareHouseImpl().getAmount();
} finally {
em.close();
}
}
@Override
public void exportGoods(Goods goods, Amount amount) {
EntityManager em = emf.createEntityManager();
try {
em.find(Goods.class, goods.getId()).getWareHouseImpl().decrease(amount);
} finally {
em.close();
}
}
@Override
public boolean canExport(Goods goods, Amount amount) {
EntityManager em = emf.createEntityManager();
try {
return em.find(Goods.class, goods.getId()).getWareHouseImpl().getAmount().compareTo(amount)
>= 0
? true
: false;
} finally {
em.close();
}
}