net.sf.cpsolver.ifs.extension
Class ViolatedInitials

java.lang.Object
  net.sf.cpsolver.ifs.extension.Extension
      net.sf.cpsolver.ifs.extension.ViolatedInitials

All Implemented Interfaces:

ModelListener

public class ViolatedInitials
extends Extension

Computation of violated initial values (minimal perturbation problem).

It is using Constraint.isConsistent(Value, Value) to find out what initial values (of different variables) cannot be assigned when an arbitrary value is assigned to a variable. This information is computed in advance, before the solver is executed. It is used for better estimation of perturbation penalty (see PerturbationsCounter) when a value is to be assigned to a variable.

Version:

IFS 1.1 (Iterative Forward Search)
Copyright (C) 2006 Tomáš Müller
muller@unitime.org
Lazenska 391, 76314 Zlin, Czech Republic

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

This library 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

Constructor Summary

ViolatedInitials(Solver solver, DataProperties properties)

Method Summary

Set	getViolatedInitials(Value value) Initial values that cannot be assigned when the given value is assigned
boolean	init() Compute the violations between any value and all other initial values

Methods inherited from class net.sf.cpsolver.ifs.extension.Extension

afterAssigned, afterUnassigned, beforeAssigned, beforeUnassigned, constraintAdded, constraintRemoved, getModel, getProperties, getSolver, init, isRegistered, register, unregister, useValueExtra, useVariableExtra, variableAdded, variableRemoved

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ViolatedInitials

public ViolatedInitials(Solver solver,
                        DataProperties properties)

Method Detail

init

public boolean init()

Compute the violations between any value and all other initial values

getViolatedInitials

public Set getViolatedInitials(Value value)

Initial values that cannot be assigned when the given value is assigned