package org.springframework.batch.sample.domain.order.internal.extractor;
   
   import org.springframework.batch.item.file.transform.FieldExtractor;
   import org.springframework.batch.sample.domain.order.Customer;
   import org.springframework.batch.sample.domain.order.Order;
   
   /**
    * @author Dan Garrette
    * @since 2.0.1
   */
  public class CustomerFieldExtractor implements FieldExtractor<Order> {
  
  	public Object[] extract(Order order) {
  		Customer customer = order.getCustomer();
  		return new Object[] { "CUSTOMER:", customer.getRegistrationId(), emptyIfNull(customer.getFirstName()),
  				emptyIfNull(customer.getMiddleName()), emptyIfNull(customer.getLastName()) };
  	}
  
  	private String emptyIfNull(String s) {
  		return s != null ? s : "";
  	}
  
  }