001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.io.session;
003
004import static org.openstreetmap.josm.tools.I18n.tr;
005
006import java.io.IOException;
007import java.io.InputStream;
008
009import javax.xml.xpath.XPath;
010import javax.xml.xpath.XPathConstants;
011import javax.xml.xpath.XPathExpression;
012import javax.xml.xpath.XPathExpressionException;
013import javax.xml.xpath.XPathFactory;
014
015import org.openstreetmap.josm.gui.io.importexport.NoteImporter;
016import org.openstreetmap.josm.gui.layer.Layer;
017import org.openstreetmap.josm.gui.layer.NoteLayer;
018import org.openstreetmap.josm.gui.progress.ProgressMonitor;
019import org.openstreetmap.josm.io.IllegalDataException;
020import org.openstreetmap.josm.io.session.SessionReader.ImportSupport;
021import org.openstreetmap.josm.tools.Utils;
022import org.w3c.dom.Element;
023import org.xml.sax.SAXException;
024
025/**
026 * Session importer for {@link NoteLayer}.
027 * @since 9746
028 */
029public class NoteSessionImporter implements SessionLayerImporter {
030
031    @Override
032    public Layer load(Element elem, ImportSupport support, ProgressMonitor progressMonitor) throws IOException, IllegalDataException {
033        String version = elem.getAttribute("version");
034        if (!"0.1".equals(version)) {
035            throw new IllegalDataException(tr("Version ''{0}'' of meta data for note layer is not supported. Expected: 0.1", version));
036        }
037        try {
038            XPathFactory xPathFactory = XPathFactory.newInstance();
039            XPath xpath = xPathFactory.newXPath();
040            XPathExpression fileExp = xpath.compile("file/text()");
041            String fileStr = (String) fileExp.evaluate(elem, XPathConstants.STRING);
042            if (Utils.isEmpty(fileStr)) {
043                throw new IllegalDataException(tr("File name expected for layer no. {0}", support.getLayerIndex()));
044            }
045
046            NoteImporter importer = new NoteImporter();
047            try (InputStream in = support.getInputStream(fileStr)) {
048                return importer.loadLayer(in, support.getFile(fileStr), support.getLayerName(), progressMonitor);
049            }
050        } catch (XPathExpressionException | SAXException e) {
051            throw new IllegalDataException(e);
052        }
053    }
054}