cart.java

一个小型的购物商店

/*
 * Cart.java
 *
 * Created on 2006年9月14日, 下午2:11
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package com.shopping.model;
import java.util.*;

/**
 *
 * @author 曹昊
 */
public class Cart {
    
    private Map<String,Item> items = new HashMap<String,Item>();
    private double cost = 0.0;//总价格
    
    public Cart(){}
    
    public void addItem(Item item){
        items.put(item.getProduct().getId()+"",item);
    }
    
    public void modifyNumberByProductId(String productId, int number){
        Item item = (Item)items.get(productId);
        item.setNumber(number);
        item.incrementCost();
    }
    
    public void deleteItemByProductId(String productId){
        items.remove(productId);
    }
    
    public void deleteItemsByProductId(String[] productId){
        for(int i = 0; i< productId.length; i++){
            items.remove(productId[i]);
        }
    }
    
    public double getCost(){
        cost = 0.0;
        Iterator it = items.values().iterator();
        while(it.hasNext()){
            Item item = (Item)it.next();
            cost += item.getCost();
        }
        return cost;
    }
    
    public void setCost(double cost){
        this.cost = cost;
    }
    
    public void clear(){
        if(items != null){
            items.clear();
        }
        setCost(0.0);
    }
    
    public Map<String,Item> getItems(){
        return this.items;
    }
    
    public boolean isEmpty(){
        return items.size() == 0;
    }
    
}