org.optaplanner.examples.tsp.solver.score.TspEasyScoreCalculator Maven / Gradle / Ivy
/*
* Copyright 2013 Red Hat, Inc. and/or its affiliates.
*
* 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.optaplanner.examples.tsp.solver.score;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.optaplanner.core.api.score.buildin.simplelong.SimpleLongScore;
import org.optaplanner.core.impl.score.director.easy.EasyScoreCalculator;
import org.optaplanner.examples.tsp.domain.Domicile;
import org.optaplanner.examples.tsp.domain.Standstill;
import org.optaplanner.examples.tsp.domain.TspSolution;
import org.optaplanner.examples.tsp.domain.Visit;
public class TspEasyScoreCalculator implements EasyScoreCalculator {
@Override
public SimpleLongScore calculateScore(TspSolution tspSolution) {
List visitList = tspSolution.getVisitList();
Set tailVisitSet = new HashSet<>(visitList);
long score = 0L;
for (Visit visit : visitList) {
Standstill previousStandstill = visit.getPreviousStandstill();
if (previousStandstill != null) {
score -= visit.getDistanceFromPreviousStandstill();
if (previousStandstill instanceof Visit) {
tailVisitSet.remove(previousStandstill);
}
}
}
Domicile domicile = tspSolution.getDomicile();
for (Visit tailVisit : tailVisitSet) {
if (tailVisit.getPreviousStandstill() != null) {
score -= tailVisit.getDistanceTo(domicile);
}
}
return SimpleLongScore.of(score);
}
}