package com.jspservletcookbook;

import javax.servlet.*;
import javax.servlet.http.*;

import java.util.Map;
import java.util.HashMap;

public class SessionBindListen implements HttpSessionBindingListener {
    
    private Map info;

    /** Creates new SessionBindListen */
    public SessionBindListen() {
        
        //zero-arg constructor
        info = new HashMap();
    }

       public void valueBound(HttpSessionBindingEvent be) {
           
        HttpSession session = be.getSession();
        String id = session.getId();
        String name = be.getName();
        Object value = be.getValue();
        String source = be.getSource().getClass().getName();
        String message = new StringBuffer("Attribute bound to session in ").append(source).append("\nThe attribute name: ").
        append(name).append("\n").append("The attribute value: ").append(value).append("\n").append("The session id: ").append(id).toString();
        
        System.out.println(message);
    }
    
    public void valueUnbound(HttpSessionBindingEvent be) {
        
        HttpSession session = be.getSession();
        String id = session.getId();
        String name = be.getName();
        if(name == null)
            name = "Unknown";
        String source = be.getSource().getClass().getName();
        String message = new StringBuffer("Attribute unbound from session in ").append(source).append("\nThe attribute name: ").
        append(name).append("\n").append("The session id: ").append(id).toString();
        //clear Map; send message
        info.clear();
        System.out.println(message + "\nThe size of the HashMap is: " + info.size());
    }
    
    public void addInfo(String name, String email){
        
        info.put(email,name);
        
    }
    
 
}