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package gnu.crypto.assembly;

// ----------------------------------------------------------------------------
// $Id: Direction.java,v 1.2 2003/04/26 07:30:27 raif Exp $
//
// Copyright (C) 2003, Free Software Foundation, Inc.
//
// This file is part of GNU Crypto.
//
// GNU Crypto 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, or (at your option)
// any later version.
//
// GNU Crypto 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; see the file COPYING.  If not, write to the
//
//    Free Software Foundation Inc.,
//    59 Temple Place - Suite 330,
//    Boston, MA 02111-1307
//    USA
//
// Linking this library statically or dynamically with other modules is
// making a combined work based on this library.  Thus, the terms and
// conditions of the GNU General Public License cover the whole
// combination.
//
// As a special exception, the copyright holders of this library give
// you permission to link this library with independent modules to
// produce an executable, regardless of the license terms of these
// independent modules, and to copy and distribute the resulting
// executable under terms of your choice, provided that you also meet,
// for each linked independent module, the terms and conditions of the
// license of that module.  An independent module is a module which is
// not derived from or based on this library.  If you modify this
// library, you may extend this exception to your version of the
// library, but you are not obligated to do so.  If you do not wish to
// do so, delete this exception statement from your version.
// ----------------------------------------------------------------------------

/**
 * An enumeration type for wiring {@link Stage} instances into {@link
 * Cascade} Cipher chains, as well as for operating a {@link Cascade} in a
 * given direction.
 *
 * The possible values for this type are two:
 * 
 *    FORWARD: equivalent to {@link gnu.crypto.mode.IMode#ENCRYPTION}, and
 *    its inverse value
 *    REVERSED: equivalent to {@link gnu.crypto.mode.IMode#DECRYPTION}.
 * 
 *
 * @version $Revision: 1.2 $
 */
public final class Direction {

   // Constants and variables
   // -------------------------------------------------------------------------

   public static final Direction FORWARD = new Direction(1);
   public static final Direction REVERSED = new Direction(2);

   private int value;

   // Constructor(s)
   // -------------------------------------------------------------------------

   private Direction(int value) {
      super();

      this.value = value;
   }

   // Class methods
   // -------------------------------------------------------------------------

  public static final Direction reverse(Direction d) {
    return (d.equals(FORWARD) ? REVERSED : FORWARD);
  }

   // Instance methods
   // -------------------------------------------------------------------------

   public String toString() {
      return (this == FORWARD ? "forward" : "reversed");
   }
}