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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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package org.optaplanner.examples.travelingtournament.solver.move;

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

import org.optaplanner.core.api.score.director.ScoreDirector;
import org.optaplanner.core.impl.heuristic.move.AbstractMove;
import org.optaplanner.examples.travelingtournament.domain.Day;
import org.optaplanner.examples.travelingtournament.domain.Match;
import org.optaplanner.examples.travelingtournament.domain.TravelingTournament;

public class MatchChainRotationsMove extends AbstractMove {

    private List firstMatchList;
    private List secondMatchList;

    public MatchChainRotationsMove(List firstMatchList, List secondMatchList) {
        this.firstMatchList = firstMatchList;
        this.secondMatchList = secondMatchList;
    }

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

    @Override
    public MatchChainRotationsMove createUndoMove(ScoreDirector scoreDirector) {
        List inverseFirstMatchList = new ArrayList<>(firstMatchList);
        Collections.reverse(inverseFirstMatchList);
        List inverseSecondMatchList = new ArrayList<>(secondMatchList);
        Collections.reverse(inverseSecondMatchList);
        return new MatchChainRotationsMove(inverseFirstMatchList, inverseSecondMatchList);
    }

    @Override
    protected void doMoveOnGenuineVariables(ScoreDirector scoreDirector) {
        rotateList(scoreDirector, firstMatchList);
        if (!secondMatchList.isEmpty()) { // TODO create SingleMatchListRotateMove
            rotateList(scoreDirector, secondMatchList);
        }
    }

    private void rotateList(ScoreDirector scoreDirector, List matchList) {
        Iterator it = matchList.iterator();
        Match previousMatch = it.next();
        Match match = null;
        Day firstDay = previousMatch.getDay();
        while (it.hasNext()) {
            match = it.next();
            TravelingTournamentMoveHelper.moveDay(scoreDirector, previousMatch, match.getDay());
            previousMatch = match;
        }
        TravelingTournamentMoveHelper.moveDay(scoreDirector, match, firstDay);
    }

    @Override
    public MatchChainRotationsMove rebase(ScoreDirector destinationScoreDirector) {
        return new MatchChainRotationsMove(rebaseList(firstMatchList, destinationScoreDirector),
                rebaseList(secondMatchList, destinationScoreDirector));
    }

    @Override
    public Collection getPlanningEntities() {
        List entities = new ArrayList<>(firstMatchList.size() + secondMatchList.size());
        entities.addAll(firstMatchList);
        entities.addAll(secondMatchList);
        return entities;
    }

    @Override
    public Collection getPlanningValues() {
        List values = new ArrayList<>(firstMatchList.size() + secondMatchList.size());
        for (Match match : firstMatchList) {
            values.add(match.getDay());
        }
        for (Match match : secondMatchList) {
            values.add(match.getDay());
        }
        return values;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        final MatchChainRotationsMove other = (MatchChainRotationsMove) o;
        return Objects.equals(firstMatchList, other.firstMatchList) &&
                Objects.equals(secondMatchList, other.secondMatchList);
    }

    @Override
    public int hashCode() {
        return Objects.hash(firstMatchList, secondMatchList);
    }

    @Override
    public String toString() {
        return "Rotation " + firstMatchList + " & Rotation " + secondMatchList;
    }

}