jopt.csp.spi.search.localsearch
Class ImproveSolutionAction

java.lang.Object
  jopt.csp.spi.search.localsearch.ImproveSolutionAction

All Implemented Interfaces:

jopt.csp.search.SearchAction

public class ImproveSolutionAction

extends java.lang.Object

implements jopt.csp.search.SearchAction

Action that will post a constraint during searching that will require additional solutions located to be better than the solution given to this action.

Version:

$Revision: 1.3 $

Author:

Nick Coleman

See Also:

AddConstraintAction

Constructor Summary

ImproveSolutionAction(ConstraintStore store, jopt.csp.solution.SolverSolution solution, double step)

Method Summary

static jopt.csp.variable.CspConstraint	createImprovementConstraint(jopt.csp.variable.CspNumExpr obj, double newObjVal, boolean lessThan) Creates constraint to improve an objective
jopt.csp.search.SearchAction	performAction()

Methods inherited from class java.lang.Object

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

Constructor Detail

ImproveSolutionAction

public ImproveSolutionAction(ConstraintStore store,
                             jopt.csp.solution.SolverSolution solution,
                             double step)

Method Detail

performAction

public jopt.csp.search.SearchAction performAction()
                                           throws jopt.csp.variable.PropagationFailureException

Specified by:

performAction in interface jopt.csp.search.SearchAction

Throws:

jopt.csp.variable.PropagationFailureException

createImprovementConstraint

public static jopt.csp.variable.CspConstraint createImprovementConstraint(jopt.csp.variable.CspNumExpr obj,
                                                                          double newObjVal,
                                                                          boolean lessThan)

Creates constraint to improve an objective

Parameters:

obj - Objective expression to improve upon

newObjVal - New objective value that expression is constrained against

lessThan - True if objective should be <= to new val, false if objective should be >= new val