/*

   QueryNode.java

   The QueryNode class is used to represent a node in a query tree.
   Each node can be an and node, an or node, a not node, or a leaf
   node.  Leaf nodes actually represent a comparator test.

   The QueryNode classes are serializable, for bodily transmission
   over an RMI connection.

   Created: 21 October 1996

   Module By: Jonathan Abbey, jonabbey@arlut.utexas.edu

   -----------------------------------------------------------------------

   Ganymede Directory Management System

   Copyright (C) 1996-2014
   The University of Texas at Austin

   Ganymede is a registered trademark of The University of Texas at Austin

   Contact information

   Author Email: ganymede_author@arlut.utexas.edu
   Email mailing list: ganymede@arlut.utexas.edu

   US Mail:

   Computer Science Division
   Applied Research Laboratories
   The University of Texas at Austin
   PO Box 8029, Austin TX 78713-8029

   Telephone: (512) 835-3200

   This program 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.

   This program 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 program.  If not, see <http://www.gnu.org/licenses/>.

*/

package arlut.csd.ganymede.common;

/*------------------------------------------------------------------------------
                                                                           class
                                                                       QueryNode

------------------------------------------------------------------------------*/

/**
 * <p>A QueryNode is a node in a serialized {@link
 * arlut.csd.ganymede.common.Query Query} tree.  The QueryNodes form a
 * tree of boolean operators and comparison nodes that are submitted
 * to the server by the client, and which are interpreted by the
 * {@link arlut.csd.ganymede.server.DBQueryHandler
 * DBQueryHandler}.</p>
 */

public abstract class QueryNode implements java.io.Serializable {
  static final long serialVersionUID = -4396943100372813308L;

  public abstract String toString(Query query);
}