cartitem.java

实现了网上购物系统的主要功能。包括购物车和订单处理等功能。

package test.models;
import java.io.*;
import java.math.*;

/**
 *代表了购物车中各个item的信息
 */
public class CartItem implements Serializable {

  /* Private Fields */

  private Item item=new Item();
  private int quantity;
  private boolean inStock;
  private BigDecimal total;

  /* JavaBeans Properties */

  public boolean isInStock() { return inStock; }
  public void setInStock(boolean inStock) { this.inStock = inStock; }

  public BigDecimal getTotal() { return total; }

  public Item getItem() { return item; }
  public void setItem(Item item) {
    this.item = item;
    calculateTotal();
  }

  public void setItemId(Item item)
  {
    this.item.setItemId(item.getItemId());
  }
  public String getItemId()
  {
    return this.item.getItemId();
  }

//  public void setQuantity(Item item)
//  {
//    this.item.setQuantity(item.getQuantity());
//  }
//
//  public int getQuantity()
//  {
//    return this.item.getQuantity();
//  }

  public int getQuantity() { return quantity; }
  public void setQuantity(int quantity) {
    this.quantity = quantity;
    calculateTotal();
  }

  /* Public methods */

  public void incrementQuantity() {
    ++quantity;
    calculateTotal();
  }

  /**
   * 计算item的金额
   */

  private void calculateTotal() {
    if (item != null && item.getListPrice() != null) {
      total = item.getListPrice().multiply(new BigDecimal(quantity));
    } else {
      total = null;
    }
  }

  public boolean equals(Object obj)
  {
    if(obj instanceof CartItem)
    {
      CartItem objTemp=(CartItem)obj;
      if(item.getItemId().equals(objTemp.getItem().getItemId()))
        return true;
      else
        return false;
    }
    else
      return false;
  }

  public int hashCode()
  {
    return item.getItemId().hashCode();
  }

  public String toString()
  {
    return item.getItemId();
  }

}