/*
 * CookieManager.java
 * Copyright (C) 2004 The Free Software Foundation
 * 
 * This file is part of GNU inetlib, a library.
 * 
 * GNU inetlib is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * GNU inetlib is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * As a special exception, if you link this library with other files to
 * produce an executable, this library does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * This exception does not however invalidate any other reasons why the
 * executable file might be covered by the GNU General Public License.
 */

package gnu.inet.http;

import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

/**
 * A simple non-persistent cookie manager. This class can be extended to
 * provide cookie persistence.
 *
 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
 */
public class SimpleCookieManager implements CookieManager
{

  /**
   * The cookie cache.
   * This is a dictionary mapping domains to maps of cookies by name.
   */
  protected Map cookies;

  /**
   * Constructor.
   */
  public SimpleCookieManager ()
  {
    cookies = new HashMap ();
  }

  public void setCookie (Cookie cookie)
  {
    String domain = cookie.getDomain ();
    Map map = (Map) cookies.get (domain);
    if (map == null)
      {
        map = new HashMap ();
        cookies.put (domain, map);
      }
    String name = cookie.getName ();
    map.put (name, cookie); // will replace a cookie of the same name
  }

  public Cookie[] getCookies (String host, boolean secure, String path)
  {
    List matches = new ArrayList ();
    Date now = new Date ();
    if (Character.isLetter (host.charAt (0)))
      {
        int di = host.indexOf ('.');
        while (di != -1)
          {
            addCookies (matches, host, secure, path, now);
            host = host.substring (di);
            di = host.indexOf ('.', 1);
          }
      }
    addCookies (matches, host, secure, path, now);
    Cookie[] ret = new Cookie[matches.size ()];
    matches.toArray (ret);
    return ret;
  }

  private void addCookies(List matches, String domain, boolean secure,
                          String path, Date now)
  {
    Map map = (Map) cookies.get (domain);
    if (map != null)
      {
        List expired = new ArrayList ();
        for (Iterator i = map.entrySet ().iterator (); i.hasNext (); )
          {
            Map.Entry entry = (Map.Entry) i.next ();
            Cookie cookie = (Cookie) entry.getValue ();
            Date expires = cookie.getExpiryDate ();
            if (expires != null && expires.before (now))
              {
                expired.add (entry.getKey ());
                continue;
              }
            if (secure && !cookie.isSecure ())
              {
                continue;
              }
            if (path.startsWith (cookie.getPath ()))
              {
                matches.add (cookie);
              }
          }
        // Good housekeeping
        for (Iterator i = expired.iterator (); i.hasNext (); )
          {
            map.remove (i.next ());
          }
      }
  }
  
}

