cart.java

老师给的购物车

package com.tarena.shopcart.entity;

import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;

public class Cart implements Serializable {
	private double cost;

	private Map items = new HashMap();

	public Cart() {
		super();
	}

	public double getCost() {
		return cost;
	}

	public void setCost(double cost) {
		this.cost = cost;
	}

	public Map getItems() {
		return items;
	}

	public void setOrderLines(Map items) {
		this.items = items;
	}

	public void addOrderLine(Product product, long number) {
		OrderLine item0 = findOrderLineByProductId(product.getProductId());
		if (item0 != null) {
			number = number + this.getOrderLineNumber(item0);
			modifyNumberByProductId(product.getProductId(), number);
		} else {
			OrderLine item = new OrderLine(product, number);
			items.put(product.getProductId(), item);
		}

	}

	public void modifyNumberByProductId(long productId, long number) {
		OrderLine item = findOrderLineByProductId(productId);
		if (item != null) {
			item.setAmount(number);
		} else
			((OrderLine) items.get(productId)).setAmount(number);
	}

	public void deleteOrderLineByProductId(long productId) {
		items.remove(productId);
	}

	// public void deleteOrderLinesByProductId(Integer[] productId){}
	public OrderLine findOrderLineByProductId(long productId) {
		Map map = getItems();
		if (map.containsKey(productId)) {
			return (OrderLine) map.get(productId);
		} else
			return null;
	}

	public void clear() {
		items.clear();
	}

	public HashMap getCartOrderLine() {
		return null;
	}

	public long getOrderLineNumber(OrderLine item) {
		return item.getAmount();
	}

	public boolean isEmpty() {
		return items.isEmpty();
	}
}