yazdstate.java

这是学习Java必须读懂两套源代码

/**
 * Copyright (C) 2001 Yasna.com. All rights reserved.
 *
 * ===================================================================
 * The Apache Software License, Version 1.1
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by
 *        Yasna.com (http://www.yasna.com)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Yazd" and "Yasna.com" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please
 *    contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Yazd",
 *    nor may "Yazd" appear in their name, without prior written
 *    permission of Yasna.com.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL YASNA.COM OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Yasna.com. For more information
 * on Yasna.com, please see <http://www.yasna.com>.
 */

/**
 * Copyright (C) 2000 CoolServlets.com. All rights reserved.
 *
 * ===================================================================
 * The Apache Software License, Version 1.1
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by
 *        CoolServlets.com (http://www.coolservlets.com)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Jive" and "CoolServlets.com" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please
 *    contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Jive",
 *    nor may "Jive" appear in their name, without prior written
 *    permission of CoolServlets.com.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL COOLSERVLETS.COM OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of CoolServlets.com. For more information
 * on CoolServlets.com, please see <http://www.coolservlets.com>.
 */

package com.Yasna.forum.tags;

import java.util.*;
import javax.servlet.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import javax.servlet.http.*;
import com.Yasna.forum.*;

 /**
 * Maintains Yazd state information for the user session.
 * Provides methods required for maintaining the
 * user session state information.
 *
 * @see YazdRequest
 *
 * @author Glenn Nielsen
 */

public class YazdState implements HttpSessionBindingListener
{
  private Authorization authorization = null;
  // Keep track of user display preferences
  private int message_depth = 1;
  private int thread_depth = 3;
  private int items_per_page = 25;
  // Keep track of currently selected forum, thread, and message
  // for forum navigation
  private int forumID = -1;
  private int threadID = -1;
  private int messageID = -1;
  private int parentID = -1;
  // Flag whether the user is logged in
  private boolean logged_in = false;
  // Date of users last session
  private Date lastVisit = null;
  // Date of users last use of current session
  private Date nextVisit = null;
  // Variables for tracking last visist to a Forum
  private Map nextForumVisit = new HashMap();
  private Map lastForumVisit = new HashMap();
  private Map lastForumVisitCookie = new HashMap();
  // Variables for tracking previous messages page
  private Map prevMessages = new HashMap();
  // And some constants for use with extended user properties
  public final static String LAST_VISIT = "lastVisitDate";
  public final static String THREAD_DEPTH = "threadDepth";
  public final static String MESSAGE_DEPTH = "messageDepth";
  public final static String ITEMS_PER_PAGE = "itemsPerPage";
  public final static String LAST_FORUM_VISIT = "lastForumVisitDate_";
  public final static int COOKIE_EXPIRE = 60*60*24*365;

  /**
   * Required for implementing interface
   * HttpSessionBindingListener
   */
  public final void valueBound(HttpSessionBindingEvent e)
  {
  }

  /**
   * Required for implementing interface
   * HttpSessionBindingListener, used to save the
   * date and time of users lastVisit to Yazd.
   * If forums were visited, save nextForumVisit date
   * and time as an extended user property.
   */
  public final void valueUnbound(HttpSessionBindingEvent e)
  {
    saveLastVisit();
  }

  /**
   * If user is logged in save the
   * date and time user last used current session
   * as their lastVisist to Yazd.
   * If forums were visited, save nextForumVisit date
   * and time as an extended user property.
   */
  public final void saveLastVisit()
  {
    if( nextVisit == null )return;
    User user;
    ForumFactory ff = ForumFactory.getInstance(authorization);
    if( ff == null )return;
    ProfileManager pm = ff.getProfileManager();
    try {
      user = pm.getUser(authorization.getUserID());
    } catch( UserNotFoundException ex ) {
      return;
    }
    if( user.isAnonymous() ) {
      return;
    }

    user.setProperty(LAST_VISIT,"" + nextVisit.getTime());
    // Save next lastForumVisit dates to extended user properties
    String tmp;
    Date last;
    for( Iterator it=nextForumVisit.keySet().iterator(); it.hasNext(); ) {
      tmp = (String)it.next();
      last = (Date)nextForumVisit.get(tmp);
      user.setProperty( tmp, "" + last.getTime());
    }
  }

  /**
   * Update users Authorization state information
   * for current session.
   */
  public final void setAuthorization(Authorization auth)
  {
    authorization = auth;
  }

  /**
   * Get users Authorization state information
   * for current session.
   *
   * @return users Authorization
   */
  public final Authorization getAuthorization()
  {
    return authorization;
  }

  /**
   * Set the users currently selected forum
   * as session state information
   */
  public final void setForumID(int id)
  {
    forumID=id;
  }

  /**
   * Get the users currently selected forum
   * from session state information
   *
   * @return forumID
   */
  public final int getForumID()
  {
    return forumID;
  }

  /**
   * Set the users currently selected thread
   * as session state information
   */
  public final void setThreadID(int id)
  {
    threadID=id;
  }

  /**
   * Get the users currently selected thread
   * from session state information
   *
   * @return threadID
   */
  public final int getThreadID()
  {
    return threadID;
  }

  /**