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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.tsp.persistence;

import java.io.IOException;

import org.optaplanner.examples.common.persistence.AbstractTxtSolutionExporter;
import org.optaplanner.examples.common.persistence.SolutionConverter;
import org.optaplanner.examples.tsp.app.TspApp;
import org.optaplanner.examples.tsp.domain.Standstill;
import org.optaplanner.examples.tsp.domain.TspSolution;
import org.optaplanner.examples.tsp.domain.Visit;

public class TspExporter extends AbstractTxtSolutionExporter {

    public static final String OUTPUT_FILE_SUFFIX = "tour";

    public static void main(String[] args) {
        SolutionConverter converter =
                SolutionConverter.createExportConverter(TspApp.DATA_DIR_NAME, new TspExporter(), new TspSolutionFileIO());
        converter.convertAll();
    }

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

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

    public static class TspOutputBuilder extends TxtOutputBuilder {

        @Override
        public void writeSolution() throws IOException {
            bufferedWriter.write("NAME : " + solution.getName() + "\n");
            bufferedWriter.write("TYPE : TOUR\n");
            bufferedWriter.write("DIMENSION : " + solution.getLocationList().size() + "\n");
            bufferedWriter.write("TOUR_SECTION\n");
            Standstill standstill = solution.getDomicile();
            while (standstill != null) {
                bufferedWriter.write(standstill.getLocation().getId() + "\n");
                standstill = findNextVisit(standstill);
            }
            bufferedWriter.write("EOF\n");
        }

        private Visit findNextVisit(Standstill standstill) {
            for (Visit visit : solution.getVisitList()) {
                if (visit.getPreviousStandstill() == standstill) {
                    return visit;
                }
            }
            return null;
        }
    }

}