net.sf.cpsolver.ifs.solution
Class GeneralSolutionComparator<V extends Variable<V,T>,T extends Value<V,T>>

java.lang.Object
  extended by net.sf.cpsolver.ifs.solution.GeneralSolutionComparator<V,T>
All Implemented Interfaces:
SolutionComparator<V,T>
Direct Known Subclasses:
TimetableComparator

public class GeneralSolutionComparator<V extends Variable<V,T>,T extends Value<V,T>>
extends Object
implements SolutionComparator<V,T>

General implementation of solution comparator.

The solution is better than the best ever found solution when it has more variables assigned. In the case, when both solutions have the same number of assigned variables, the better solution is the one with smaller total value, i.e., the sum of Value.toDouble() over all assigned variables.

Version:
IFS 1.2 (Iterative Forward Search)
Copyright (C) 2006 - 2010 Tomas Muller
muller@unitime.org
http://muller.unitime.org

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 3 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 see http://www.gnu.org/licenses/.
See Also:
Solution, Solver

Constructor Summary
GeneralSolutionComparator()
           
GeneralSolutionComparator(DataProperties properties)
          No parameters are used so far.
 
Method Summary
 boolean isBetterThanBestSolution(Solution<V,T> currentSolution)
          Compares two solutions.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

GeneralSolutionComparator

public GeneralSolutionComparator()

GeneralSolutionComparator

public GeneralSolutionComparator(DataProperties properties)
No parameters are used so far.

Method Detail

isBetterThanBestSolution

public boolean isBetterThanBestSolution(Solution<V,T> currentSolution)
Description copied from interface: SolutionComparator
Compares two solutions. Returns true if the given solution is better than its best ever found solution (see Solution.saveBest() and Solution.restoreBest()).

Specified by:
isBetterThanBestSolution in interface SolutionComparator<V extends Variable<V,T>,T extends Value<V,T>>
Parameters:
currentSolution - given solution
Returns:
true if the given solution is better than the best ever found solution


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