cart.java

购物车源码

package com.charles.entity;

import java.util.HashMap;

public class Cart {
	private HashMap<Integer, Item> items;
	private double cost;
	public Cart() {} 
	
	public Cart(HashMap<Integer, Item> items, double cost) {
		super();
		this.items = new HashMap<Integer, Item>();
		this.cost = cost;
	}

	public HashMap getItems() {
		return items;
	}
	public void addItem(int number,Product product) {
		Item item=(Item)items.get(product.getId());
		if(item==null) {
			item=new Item();
			item.setAmount(0);
			item.setProduct(product);
			items.put(product.getId(), item);
		}
		item.setAmount(item.getAmount()+number);
		item.setCost(product.getPrice()*item.getAmount());
		cost+=product.getPrice()*number;
	}
	public void modifyNumberByProductId(int number,Integer productId) {
		Item item=(Item)items.get(productId);
		int nun=item.getAmount();
		item.setAmount(number);
		item.setCost(item.getProduct().getPrice()*number);
		cost+=item.getProduct().getPrice()*(number-nun);
	}
	public void deleteItemByProductId(Integer productId) {
		items.remove(productId);
	}
	public void deleteItemsByProductId(Integer[] productIds) {
		for(Integer productId:productIds) {
			deleteItemByProductId(productId);
		}
	}
	public void clear() {
		items.clear();
	}
	public boolean isEmpty() {
		return items.isEmpty();
	}
	public int getItemNumber() {
		
		return this.getItems().size();
	}
	public HashMap getCartItem() {
		return this.getItems();
	}
}