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/*
* This file is part of choco-solver, http://choco-solver.org/
*
* Copyright (c) 2023, IMT Atlantique. All rights reserved.
*
* Licensed under the BSD 4-clause license.
*
* See LICENSE file in the project root for full license information.
*/
package org.chocosolver.solver.constraints;
import org.chocosolver.solver.constraints.reification.PropConditional;
import org.chocosolver.solver.variables.Variable;
import java.util.function.Function;
import java.util.function.Supplier;
/**
* Interface to make constraints over BoolVar, IntVar, RealVar and SetVar
*
* A kind of factory relying on interface default implementation to allow (multiple) inheritance
*
* @author Jean-Guillaume FAGES
*/
public interface IConstraintFactory extends IIntConstraintFactory, IRealConstraintFactory, ISetConstraintFactory, IGraphConstraintFactory {
/**
* Create a constraint that acts as an observer.
* and anytime a variable from {@code scope} is modified,
* the condition defined by {@code checker} is checked.
* If the condition holds, then the constraints provided by {@code provider} are posted in the current sub-tree
* (i.e., they are removed upon backtrack).
*
* @param scope set of variables on the modifications of which the condition in {@code checker} is verified
* @param checker condition checker
* @param provider constraints provider
* @return a conditional constraint. Can supply {@code null}.
* @implNote the constraint does not filter values from variables in {@code scope}, it just acts as an observer.
* @see PropConditional#ALL_INSTANTIATED
* @see PropConditional#ONE_INSTANTIATED
*/
default Constraint conditional(
Variable[] scope,
Function checker,
Supplier provider) {
return new Constraint(
ConstraintsName.CONDITION,
new PropConditional(scope, checker, provider)
);
}
}