/**
* Copyright (c) 1999-2014, Ecole des Mines de Nantes
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Ecole des Mines de Nantes nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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*/
package solver.constraints.ternary;
import solver.constraints.Constraint;
import solver.exception.SolverException;
import solver.variables.IntVar;
/**
* X*Y = Z
* <br/>
*
* @author Charles Prud'homme
* @since 26/01/11
*/
public class Times extends Constraint {
private static boolean inIntBounds(IntVar x, IntVar y) {
boolean l1 = inIntBounds((long) x.getLB() * (long) y.getLB());
boolean l2 = inIntBounds((long) x.getUB() * (long) y.getLB());
boolean l3 = inIntBounds((long) x.getLB() * (long) y.getUB());
boolean l4 = inIntBounds((long) x.getUB() * (long) y.getUB());
return l1 && l2 && l3 && l4;
}
/**
* @param l1 a long
* @return Integer.MIN_VALUE < l1 < Integer.MAX_VALUE
*/
public static boolean inIntBounds(long l1) {
return l1 > Integer.MIN_VALUE && l1 < Integer.MAX_VALUE;
}
public Times(IntVar v1, IntVar v2, IntVar result) {
super("Times",new PropTimesNaive(v1,v2,result));
if (!inIntBounds(v1, v2)) {
throw new SolverException("Integer overflow.\nConsider reducing the variable domains.");
}
}
}