shoppingcartbean.java

web开发经典案例shoppingcart的EJB实现其entity部分

/*
 * ShoppingCartBean.java
 *
 * Created on 2008年6月2日, 上午9:44
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package stateful;

import java.util.HashSet;
import javax.ejb.Stateless;

/**
 *
 * @author teacher
 */
@Stateless(mappedName="shoppingCart")
public class ShoppingCartBean implements ShoppingCartRemote {
    private HashSet<SaleLine> saleLines = 
            new HashSet<SaleLine>();
    /** Creates a new instance of ShoppingCartBean */
    public ShoppingCartBean() {
    }

    public void add(SaleLine s) {
        //TODO implement add
        for(SaleLine saleLine : saleLines){
            if(saleLine.equals(s)){
                saleLine.setQty(saleLine.getQty() + s.getQty());
                return;
            }
        }
        saleLines.add(s);
    }

    public void remove(SaleLine s) {
        //TODO implement remove
        for(SaleLine saleLine : saleLines){
            if(saleLine.equals(s)){
                saleLines.remove(saleLine);
                return;
            }
        }
    }

    public double cost() {
        //TODO implement cost
        double total = 0;
        for(SaleLine saleLine : saleLines){
            total +=saleLine.getQty() * saleLine.getProduct().getPrice();
        }
        return total;
    }
    
    public HashSet<SaleLine> list(){
        return saleLines;
    }
        
    
    
    
}