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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.common.persistence;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import org.jdom.Document;
import org.jdom.JDOMException;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;
import org.optaplanner.core.api.domain.solution.PlanningSolution;

/**
 * @param  the solution type, the class with the {@link PlanningSolution} annotation
 */
public abstract class AbstractXmlSolutionExporter extends AbstractSolutionExporter {

    protected static final String DEFAULT_OUTPUT_FILE_SUFFIX = "xml";

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

    public abstract XmlOutputBuilder createXmlOutputBuilder();

    @Override
    public void writeSolution(Solution_ solution, File outputFile) {
        try (OutputStream out = new BufferedOutputStream(new FileOutputStream(outputFile))) {
            Document document = new Document();
            XmlOutputBuilder xmlOutputBuilder = createXmlOutputBuilder();
            xmlOutputBuilder.setDocument(document);
            xmlOutputBuilder.setSolution(solution);
            xmlOutputBuilder.writeSolution();
            XMLOutputter outputter = new XMLOutputter(Format.getPrettyFormat());
            outputter.output(document, out);
            logger.info("Exported: {}", outputFile);
        } catch (IOException e) {
            throw new IllegalArgumentException("Could not write the file (" + outputFile.getName() + ").", e);
        } catch (JDOMException e) {
            throw new IllegalArgumentException("Could not format the XML file (" + outputFile.getName() + ").", e);
        }
    }

    public static abstract class XmlOutputBuilder extends OutputBuilder {

        protected Document document;

        public void setDocument(Document document) {
            this.document = document;
        }

        public abstract void setSolution(Solution_ solution);

        public abstract void writeSolution() throws IOException, JDOMException;

        // ************************************************************************
        // Helper methods
        // ************************************************************************

    }

}