/*
 * $Id: GroupIterator.java,v 1.4 2004/07/28 09:37:21 dog Exp $
 * Copyright (C) 2002 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.nntp;

import java.io.IOException;
import java.util.NoSuchElementException;

/**
 * An iterator over an NNTP newsgroup listing.
 *
 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
 * @version $Revision: 1.4 $ $Date: 2004/07/28 09:37:21 $
 */
public class GroupIterator extends LineIterator
{

  static final String CAN_POST = "y";

  GroupIterator (NNTPConnection connection)
  {
    super (connection);
  }

  /**
   * Returns the next group.
   */
  public Object next ()
  {
    try
      {
        return nextGroup ();
      }
    catch (IOException e)
      {
        throw new NoSuchElementException ("I/O error: " + e.getMessage ());
      }
  }

  /**
   * Returns the next group.
   */
  public Group nextGroup () throws IOException
  {
    String line = nextLine ();

    // Parse line
    int start = 0, end;
    end = line.indexOf (' ', start);
    String name = line.substring (start, end);
    start = end + 1;
    end = line.indexOf (' ', start);
    int last = Integer.parseInt (line.substring (start, end));
    start = end + 1;
    end = line.indexOf (' ', start);
    int first = Integer.parseInt (line.substring (start, end));
    start = end + 1;
    boolean canPost = CAN_POST.equals (line.substring (start));

    return new Group (name, last, first, canPost);
  }

}
