/*
This class is part of a Java port of Craig Nevill-Manning's Sequitur algorithm.
Copyright (C) 1997 Eibe Frank

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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

public class guard extends symbol{

  rule r;

  guard(rule theRule){
    r = theRule;
    value = 0;
    p = this;
    n = this;
  }

  public void cleanUp(){
    join(p,n);
  }

  public boolean isGuard(){
    return true;
  }

  public void deleteDigram(){
    
    // Do nothing
  }
  
  public boolean check(){
    return false;
  }
}