cartbean.java

一个适合初学者学习的基于jsp的网上书店

package cn.sotrain.bookstore;

import java.util.ArrayList;
import java.util.Iterator;

public class CartBean {
	private ArrayList<CartItem> items = new ArrayList<CartItem>();
	private int count;
	private float amount;

	public void add(Book b) {
		for (CartItem item : items) {
			if (item.getBook().getId().equals(b.getId())) {
				item.setNum(item.getNum() + 1);
				recompute();
				return;
			}
		}
		CartItem item = new CartItem();
		item.setBook(b);
		item.setNum(1);
		items.add(item);
		recompute();
	}

	private void recompute() {
		count = 0;
		amount = 0;
		for (CartItem item : items) {
			count += item.getNum();
			amount += item.getNum() * item.getBook().getPrice();
		}
	}

	public void remove(Book b) {
		Iterator<CartItem> it = items.iterator();
		CartItem item;
		while (it.hasNext()) {
			item = it.next();
			if (item.getBook().getId().equals(b.getId())) {
				it.remove();
				recompute();
				return;
			}
		}
	}
	
	public void clear(){
		items.clear();
		count=0;
		amount=0;
	}

	public ArrayList<CartItem> getItems() {
		return items;
	}

	public void setItems(ArrayList<CartItem> items) {
		this.items = items;
	}

	public int getCount() {
		return count;
	}

	public void setCount(int count) {
		this.count = count;
	}

	public float getAmount() {
		return amount;
	}

	public void setAmount(float amount) {
		this.amount = amount;
	}
}