orderproxy.java

著名的uncle Bob的Agile software development的代码

import java.sql.SQLException;

public class OrderProxy implements Order
{
  private int orderId;

  public OrderProxy(int orderId)
  {
    this.orderId = orderId;
  }

  public int total()
  {
    try
    {
      OrderImp imp = new OrderImp(getCustomerId());
      ItemData[] itemDataArray = DB.getItemsForOrder(orderId);
      for (int i = 0; i < itemDataArray.length; i++)
      {
        ItemData item = itemDataArray[i];
        imp.addItem(new ProductProxy(item.sku), item.qty);
      }
      return imp.total();
    }
    catch (Exception e)
    {
      throw new Error(e.toString());
    }
  }

  public String getCustomerId()
  {
    try
    {
      OrderData od = DB.getOrderData(orderId);
      return od.customerId;
    }
    catch (SQLException e)
    {
      throw new Error(e.toString());
    }
  }

  public void addItem(Product p, int quantity)
  {
    try
    {
      ItemData id = new ItemData(orderId, quantity, p.getSku());
      DB.store(id);
    }
    catch (Exception e)
    {
      throw new Error(e.toString());
    }
  }

  public int getOrderId()
  {
    return orderId;
  }


}