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Drools Planner optimizes automated planning by combining metaheuristic search algorithms with rule
engine powered score calculation. This is the drools-planner-examples module which contains examples on how to use
Drools Planner.
/*
* 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.examples.curriculumcourse.domain.solver;
import org.apache.commons.lang.builder.CompareToBuilder;
import org.drools.planner.api.domain.variable.PlanningValueStrengthWeightFactory;
import org.drools.planner.core.solution.Solution;
import org.drools.planner.examples.curriculumcourse.domain.CurriculumCourseSchedule;
import org.drools.planner.examples.curriculumcourse.domain.Period;
import org.drools.planner.examples.curriculumcourse.domain.UnavailablePeriodConstraint;
public class PeriodStrengthWeightFactory implements PlanningValueStrengthWeightFactory {
public Comparable createStrengthWeight(Solution solution, Object planningValue) {
CurriculumCourseSchedule schedule = (CurriculumCourseSchedule) solution;
Period period = (Period) planningValue;
int unavailablePeriodConstraintCount = 0;
for (UnavailablePeriodConstraint constraint : schedule.getUnavailablePeriodConstraintList()) {
if (constraint.getPeriod().equals(period)) {
unavailablePeriodConstraintCount++;
}
}
return new PeriodStrengthWeight(period, unavailablePeriodConstraintCount);
}
public static class PeriodStrengthWeight implements Comparable {
private final Period period;
private final int unavailablePeriodConstraintCount;
public PeriodStrengthWeight(Period period, int unavailablePeriodConstraintCount) {
this.period = period;
this.unavailablePeriodConstraintCount = unavailablePeriodConstraintCount;
}
public int compareTo(PeriodStrengthWeight other) {
return new CompareToBuilder()
// The higher unavailablePeriodConstraintCount, the weaker
.append(other.unavailablePeriodConstraintCount, unavailablePeriodConstraintCount) // Descending
.append(period.getDay().getDayIndex(), other.period.getDay().getDayIndex())
.append(period.getTimeslot().getTimeslotIndex(), other.period.getTimeslot().getTimeslotIndex())
.append(period.getId(), other.period.getId())
.toComparison();
}
}
}