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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.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.xml.XMLConstants;

import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.JDOMException;
import org.jdom2.input.SAXBuilder;
import org.jdom2.input.sax.XMLReaders;
import org.optaplanner.core.api.domain.solution.PlanningSolution;
import org.optaplanner.examples.common.business.SolutionBusiness;

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

    private static final String DEFAULT_INPUT_FILE_SUFFIX = "xml";

    @Override
    public String getInputFileSuffix() {
        return DEFAULT_INPUT_FILE_SUFFIX;
    }

    public abstract XmlInputBuilder createXmlInputBuilder();

    @Override
    public Solution_ readSolution(File inputFile) {
        try (InputStream in = new BufferedInputStream(new FileInputStream(inputFile))) {
            // CVE-2021-33813
            SAXBuilder builder = new SAXBuilder(XMLReaders.NONVALIDATING);
            builder.setProperty(XMLConstants.ACCESS_EXTERNAL_DTD, "");
            builder.setProperty(XMLConstants.ACCESS_EXTERNAL_SCHEMA, "");
            builder.setExpandEntities(false);

            Document document = builder.build(in);
            XmlInputBuilder xmlInputBuilder = createXmlInputBuilder();
            xmlInputBuilder.setInputFile(inputFile);
            xmlInputBuilder.setDocument(document);
            try {
                Solution_ solution = xmlInputBuilder.readSolution();
                logger.info("Imported: {}", inputFile);
                return solution;
            } catch (IllegalArgumentException | IllegalStateException e) {
                throw new IllegalArgumentException("Exception in inputFile (" + inputFile + ")", e);
            }
        } catch (IOException e) {
            throw new IllegalArgumentException("Could not read the file (" + inputFile.getName() + ").", e);
        } catch (JDOMException e) {
            throw new IllegalArgumentException("Could not parse the XML file (" + inputFile.getName() + ").", e);
        }
    }

    public static abstract class XmlInputBuilder extends InputBuilder {

        protected File inputFile;
        protected Document document;

        public void setInputFile(File inputFile) {
            this.inputFile = inputFile;
        }

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

        public abstract Solution_ readSolution() throws IOException, JDOMException;

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

        public String getInputId() {
            return SolutionBusiness.getBaseFileName(inputFile);
        }

        protected void assertElementName(Element element, String name) {
            if (!element.getName().equals(name)) {
                throw new IllegalStateException("Element name (" + element.getName()
                        + ") should be " + name + ".");
            }
        }

    }

}