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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.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, TspSolution.class, new TspExporter());
        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;
        }
    }

}