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A graph module for Choco Solver.

There is a newer version: 4.2.2

/*
 * 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
 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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/**
 * Created by IntelliJ IDEA.
 * User: Jean-Guillaume Fages
 * Date: 14/01/12
 * Time: 01:03
 */

package org.chocosolver.graphsolver.cstrs.cost;

import org.chocosolver.util.objects.graphs.IGraph;

public interface IGraphRelaxation {

    /**
     * @return true iff arc (i,j) belongs to the current solution of the relaxation
     */
    boolean contains(int i, int j);

    /**
     * @return the cost augmentation induced by the removal of arc (i,j)
     *         assumes that (i,j) belongs to the current solution of the relaxation
     */
    double getReplacementCost(int i, int j);

    /**
     * @return the cost augmentation induced by the enforcing of arc (i,j)
     *         assumes that (i,j) does not belong to the current solution of the relaxation
     */
    double getMarginalCost(int i, int j);

    /**
     * @return the (graph) support of the relaxation
     */
    IGraph getSupport();
}