user.java

Java的wap push

package push;

import members.Members;
import java.io.*;
import java.util.Hashtable;
import java.util.Vector;
import java.util.Enumeration;
import javax.servlet.http.*;

/**
 * Class User is a used to store push information for users logged in, i.e
 * having an active session
 * 
 * @version 1.0
 * @since 1.0
 * @see HttpSessionBindingListener
 */
public final class User implements HttpSessionBindingListener {

	/*
	 * vector of users who have currently a valid session (with push enabled WAP
	 * device). Whenever the session becomes invalidated, the user object is
	 * removed from the vector.
	 */
	private static final Vector usersOnline = new Vector();

	private HttpSession session = null;

	private final String name;

	private final String address;

	private final Hashtable properties;

	/**
	 * Creates a new <code>User</code> instance.
	 * 
	 * @param name
	 *            a <code>String</code> value
	 * @param address
	 *            a <code>String</code> value
	 */
	public User(String name, String address) {
		this.name = name;
		this.address = address;
		properties = new Hashtable();
	}

	/**
	 * Returns user name
	 * 
	 * @return a <code>String</code> value
	 */
	public String getName() {
		return (String) session.getAttribute("name");
	}

	/**
	 * Returns date of birth
	 * 
	 * @return a <code>String</code> value
	 */
	public String getDob() {
		return (String) session.getAttribute("dob");
	}

	/**
	 * Returns user selected push services
	 * 
	 * @return a <code>String</code> value
	 */
	public String getPushServices() {
		return (String) session.getAttribute("pushservices");
	}

	/**
	 * Returns the user's (client) address
	 * 
	 * @return a <code>String</code> value
	 */
	public String getAddress() {
		return address;
	}

	/**
	 * Returns the user's (client) address. The address is of given type.
	 * 
	 * @param addressType
	 *            a <code>String</code> value (IPv4 or PLMN)
	 * @return a <code>String</code> value
	 */
	public String getAddress(String addressType) {
		if (addressType.equals("IPv4"))
			return address;
		else if (addressType.equals("PLMN"))
			return Members.getPhoneNumber(getName());
		return null;
	}

	/**
	 * Set a property with the user object
	 * 
	 * @param name
	 *            a <code>String</code> value
	 * @param value
	 *            a <code>String</code> value
	 */
	public void setProperty(String name, Object value) {
		properties.put(name, value);
	}

	/**
	 * Finds property object by given property name
	 * 
	 * @param name
	 *            a <code>String</code> value
	 * @return an <code>Object</code> value
	 */
	public Object getProperty(String name) {
		return properties.get(name);
	}

	/**
	 * Returns users currently logged in
	 * 
	 * @return a <code>Vector</code> value
	 */
	public static Vector getUsersOnline() {
		return usersOnline;
	}

	/**
	 * Finds user on the basis of given name
	 * 
	 * @param name
	 *            a <code>String</code> value
	 * @return an <code>User</code> value
	 * @exception Exception
	 *                if an error occurs
	 */
	public static User findUser(String name) throws Exception {
		synchronized (usersOnline) {
			for (Enumeration e = usersOnline.elements(); e.hasMoreElements();) {
				User user = (User) e.nextElement();
				if (user.getName().equals(name))
					return user;
			}
		}
		return null;
	}

	/**
	 * Notifies the User object that it is being bound to a session and
	 * identifies the session.
	 * 
	 * @param event
	 *            a <code>HttpSessionBindingEvent</code> value
	 * @see HttpSessionBindingListener
	 */
	public void valueBound(HttpSessionBindingEvent event) {
		session = event.getSession();
		synchronized (usersOnline) {
			usersOnline.add(this);
		}
	}

	/**
	 * Notifies the User object that it is being unbound from a session and
	 * identifies the session.
	 * 
	 * @param event
	 *            a <code>HttpSessionBindingEvent</code> value
	 * @see HttpSessionBindingListener
	 */
	public void valueUnbound(HttpSessionBindingEvent event) {
		synchronized (usersOnline) {
			usersOnline.remove(this);
			System.out
					.println("Session invalidated (max inactive time): user = "
							+ name);
		}
	}

}