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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 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.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 org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.optaplanner.core.impl.heuristic.move.Move;
import org.optaplanner.core.impl.score.director.ScoreDirector;
import org.optaplanner.examples.travelingtournament.domain.Day;
import org.optaplanner.examples.travelingtournament.domain.Match;

public class MatchChainRotationsMove implements Move {

    private List firstMatchList;
    private List secondMatchList;

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

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

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

    public void doMove(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);
    }

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

    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;
    }

    public boolean equals(Object o) {
        if (this == o) {
            return true;
        } else if (o instanceof MatchChainRotationsMove) {
            MatchChainRotationsMove other = (MatchChainRotationsMove) o;
            return new EqualsBuilder()
                    .append(firstMatchList, other.firstMatchList)
                    .append(secondMatchList, other.secondMatchList)
                    .isEquals();
        } else {
            return false;
        }
    }

    public int hashCode() {
        return new HashCodeBuilder()
                .append(firstMatchList)
                .append(secondMatchList)
                .toHashCode();
    }

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

}