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OptaPlanner solves planning problems. This lightweight, embeddable planning engine implements powerful and scalable algorithms to optimize business resource scheduling and planning. This module contains the examples which demonstrate how to use it in a normal Java application.

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/*
 * Copyright 2014 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.cheaptime.solver.move;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

import org.optaplanner.core.impl.heuristic.move.AbstractMove;
import org.optaplanner.core.impl.score.director.ScoreDirector;
import org.optaplanner.examples.cheaptime.domain.CheapTimeSolution;
import org.optaplanner.examples.cheaptime.domain.TaskAssignment;

public class CheapTimePillarSlideMove extends AbstractMove {

    private final List pillar;
    private final int startPeriodDiff;

    public CheapTimePillarSlideMove(List pillar, int startPeriodDiff) {
        this.pillar = pillar;
        this.startPeriodDiff = startPeriodDiff;
    }

    @Override
    public boolean isMoveDoable(ScoreDirector scoreDirector) {
        return true;
    }

    @Override
    public CheapTimePillarSlideMove createUndoMove(ScoreDirector scoreDirector) {
        return new CheapTimePillarSlideMove(pillar, -startPeriodDiff);
    }

    @Override
    protected void doMoveOnGenuineVariables(ScoreDirector scoreDirector) {
        for (TaskAssignment taskAssignment : pillar) {
            scoreDirector.beforeVariableChanged(taskAssignment, "startPeriod");
            taskAssignment.setStartPeriod(taskAssignment.getStartPeriod() + startPeriodDiff);
            scoreDirector.afterVariableChanged(taskAssignment, "startPeriod");
        }
    }

    @Override
    public CheapTimePillarSlideMove rebase(ScoreDirector destinationScoreDirector) {
        return new CheapTimePillarSlideMove(rebaseList(pillar, destinationScoreDirector), startPeriodDiff);
    }

    @Override
    public Collection getPlanningEntities() {
        return Collections.singletonList(pillar);
    }

    @Override
    public Collection getPlanningValues() {
        // Presumes this method is always called after the move is done.
        List startPeriodList = new ArrayList<>(pillar.size());
        for (TaskAssignment taskAssignment : pillar) {
            startPeriodList.add(taskAssignment.getStartPeriod());
        }
        return Collections.singletonList(startPeriodList);
    }

    @Override
    public String toString() {
        return pillar + " {" + (startPeriodDiff < 0 ? startPeriodDiff : "+" + startPeriodDiff) + "}";
    }

}