package ejava.examples.ejbwar.customer.dao;
   
   import java.util.List;
   
   import javax.inject.Inject;
   import javax.persistence.EntityManager;
   import javax.persistence.TypedQuery;
   
   import ejava.examples.ejbwar.customer.Customers;
  import ejava.examples.ejbwar.customer.bo.Customer;
  
  /**
   * This class implemenets a DAO for the Customer domain.
   */
  public class CustomerDAOImpl implements CustomerDAO {
  	@Inject @Customers
  	private EntityManager em;
  	
  	@Override
  	public void createCustomer(Customer customer) {
  		em.persist(customer);		
  	}
  	
  	@Override
  	public List<Customer> findCustomerByName(String firstName, String lastName,
  			int offset, int limit) {
  		TypedQuery<Customer> query = em.createNamedQuery(Customer.FIND_BY_NAME, Customer.class)
  			.setParameter("firstName", "%" + firstName + "%")
  			.setParameter("lastName", "%" + lastName + "%");
  		if (offset > 0) {
  			query.setFirstResult(offset);
  		}
  		if (limit > 0) {
  			query.setMaxResults(limit);
  		}
  		return query.getResultList();
  	}
  	
  	@Override
  	public Customer getCustomer(int id) {
  		return em.find(Customer.class, id);
  	}
  	
  	@Override
  	public Customer update(Customer customer) {
  		return em.merge(customer);
  	}
  	
  	@Override
  	public void deleteCustomer(Customer customer) {
  		em.remove(customer);
  	}
  }