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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.persistence;

import java.io.IOException;

import org.optaplanner.examples.common.persistence.AbstractTxtSolutionExporter;
import org.optaplanner.examples.common.persistence.SolutionConverter;
import org.optaplanner.examples.travelingtournament.app.TravelingTournamentApp;
import org.optaplanner.examples.travelingtournament.domain.Day;
import org.optaplanner.examples.travelingtournament.domain.Match;
import org.optaplanner.examples.travelingtournament.domain.Team;
import org.optaplanner.examples.travelingtournament.domain.TravelingTournament;

public class TravelingTournamentExporter extends AbstractTxtSolutionExporter {

    private static final String OUTPUT_FILE_SUFFIX = "trick.txt";

    public static void main(String[] args) {
        SolutionConverter converter =
                SolutionConverter.createExportConverter(TravelingTournamentApp.DATA_DIR_NAME,
                        new TravelingTournamentExporter(), new TravelingTournamentSolutionFileIO());
        converter.convertAll();
    }

    @Override
    public String getOutputFileSuffix() {
        return OUTPUT_FILE_SUFFIX;
    }

    @Override
    public TxtOutputBuilder createTxtOutputBuilder() {
        return new TravelingTournamentOutputBuilder();
    }

    public static class TravelingTournamentOutputBuilder extends TxtOutputBuilder {

        @Override
        public void writeSolution() throws IOException {
            int maximumTeamNameLength = 0;
            for (Team team : solution.getTeamList()) {
                if (team.getName().length() > maximumTeamNameLength) {
                    maximumTeamNameLength = team.getName().length();
                }
            }
            for (Team team : solution.getTeamList()) {
                bufferedWriter.write(String.format("%-" + (maximumTeamNameLength + 3) + "s", team.getName()));
            }
            bufferedWriter.write("\n");
            for (Team team : solution.getTeamList()) {
                bufferedWriter.write(
                        String.format("%-" + (maximumTeamNameLength + 3) + "s", team.getName().replaceAll("[\\w\\d]", "-")));
            }
            bufferedWriter.write("\n");
            for (Day day : solution.getDayList()) {
                for (Team team : solution.getTeamList()) {
                    // this could be put in a hashmap first for performance
                    boolean opponentIsHome = false;
                    Team opponentTeam = null;
                    for (Match match : solution.getMatchList()) {
                        if (match.getDay().equals(day)) {
                            if (match.getHomeTeam().equals(team)) {
                                opponentIsHome = false;
                                opponentTeam = match.getAwayTeam();
                            } else if (match.getAwayTeam().equals(team)) {
                                opponentIsHome = true;
                                opponentTeam = match.getHomeTeam();
                            }
                        }
                    }

                    if (opponentTeam != null) {
                        String opponentName = (opponentIsHome ? "@" : "") + opponentTeam.getName();
                        bufferedWriter.write(String.format("%-" + (maximumTeamNameLength + 3) + "s", opponentName));
                    }
                }
                bufferedWriter.write("\n");
            }
        }

    }

}