bitunequalizer.java

Java版的SAT求解器

/*
 * BitUnequalizer.java	1.1 05/03/09
 *
 * Copyright 2004-2005 Positronic Software.
 *
 *
 */
 /**
 An extension of the Problem class which imposes a Boolean relation on two
 * IBooleanVariables. For example, the Problem instance p defined by
 *
 * <p><tt>Problem p=new BitUnequalizer(x,y);</tt></p>
 *
 * is satisfied if and only if the following Boolean relation is satisfied:
 *
 * <p><tt>x!=y</tt></p>
 *
 * Note that BitUnequalizer is equivalent to BitNoter.
 *
 * @author  Kerry Michael Soileau
 * [e-mail]
 * http://web.wt.net/~ksoileau/index.htm
 * @version 1.1, 05/03/09
 * @see IBooleanVariable
 * @see IClause
 * @see Problem
 */

package positronic.satisfiability.elements;

import positronic.satisfiability.exceptions.BitUnequalizerException;

public class BitUnequalizer extends Problem implements IProblem
{
  private static final long serialVersionUID = 1L;
  
  public BitUnequalizer(IBooleanVariable x, IBooleanVariable y) throws Exception
  {
  	if(x==null || y==null)
  		throw new BitUnequalizerException("Null IBooleanVariable was passed to constructor.");
    this.setClauses(new IClause[]
    {
    	Clause.newClause().or(x).or(y),
    	Clause.newClause().orNot(x).orNot(y)
    });
  }
}