Start line:  
End line:  

Snippet Preview

Snippet HTML Code

Stack Overflow Questions
 /*
  * Copyright 2010 JBoss Inc
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.drools.planner.core.localsearch.decider.acceptor.greatdeluge;
TODO Under construction. Feel free to create a patch to improve this acceptor!
public class GreatDelugeAcceptor extends AbstractAcceptor {
    protected final double waterLevelUpperBoundRate;
    protected final double waterRisingRate;
    // TODO lowerboundRate when waterLevel rises on every MoveScope (not just every step) to reset waterlevel to upperbound
//    protected final double waterLevelLowerBoundRate;
    protected Score waterLevelScore = null;
    public GreatDelugeAcceptor(double waterLevelUpperBoundRatedouble waterRisingRate) {
        this. = waterLevelUpperBoundRate;
        this. = waterRisingRate;
    }
    // ************************************************************************
    // Worker methods
    // ************************************************************************
    @Override
    public void phaseStarted(LocalSearchSolverPhaseScope localSearchSolverPhaseScope) {
        if ( < 1.0) {
            throw new IllegalArgumentException("The greatDelugeWaterLevelUpperBoundRate (" + 
                    + ") should be 1.0 or higher.");
        }
        if ( <= 0.0 ||  >= 1.0) {
            throw new IllegalArgumentException("The greatDelugeWaterRisingRate (" + 
                    + ") should be between 0.0 and 1.0 (preferably very close to 0.0).");
        }
         = localSearchSolverPhaseScope.getBestScore().multiply();
        Score perfectMaximumScore = localSearchSolverPhaseScope.getScoreDefinition().getPerfectMaximumScore();
        if (.compareTo(perfectMaximumScore) > 0) {
            throw new IllegalArgumentException("The waterLevelScore (" + 
                    + ") should not be higher than the perfectMaximumScore(" + perfectMaximumScore + ").");
        }
    }
    public double calculateAcceptChance(MoveScope moveScope) {
        if (moveScope.getScore().compareTo() >= 0) {
            return 1.0;
        } else {
            return 0.0;
        }
    }
    @Override
    public void stepTaken(LocalSearchStepScope localSearchStepScope) {
        if (localSearchStepScope.getStepIndex() == localSearchStepScope.getLocalSearchSolverPhaseScope().getBestSolutionStepIndex()) {
            // New best score
        } else {
            Score perfectMaximumScore = localSearchStepScope.getLocalSearchSolverPhaseScope().getScoreDefinition()
                    .getPerfectMaximumScore();
            Score waterLevelAugend = perfectMaximumScore.subtract().multiply();
             = .add(waterLevelAugend);
            // TODO maybe if waterlevel is higher than bestScore, than ...
        }
    }
New to GrepCode? Check out our FAQ X