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.GpxImporter;
016import org.openstreetmap.josm.gui.io.importexport.NMEAImporter;
017import org.openstreetmap.josm.gui.layer.GpxLayer;
018import org.openstreetmap.josm.gui.layer.Layer;
019import org.openstreetmap.josm.gui.progress.ProgressMonitor;
020import org.openstreetmap.josm.io.IllegalDataException;
021import org.w3c.dom.Element;
022
023/**
024 * Session exporter for {@link GpxLayer}.
025 * @since 5501
026 */
027public class GpxTracksSessionImporter implements SessionLayerImporter {
028
029    @Override
030    public Layer load(Element elem, SessionReader.ImportSupport support, ProgressMonitor progressMonitor)
031            throws IOException, IllegalDataException {
032        String version = elem.getAttribute("version");
033        if (!"0.1".equals(version)) {
034            throw new IllegalDataException(tr("Version ''{0}'' of meta data for gpx track layer is not supported. Expected: 0.1", version));
035        }
036        try {
037            XPathFactory xPathFactory = XPathFactory.newInstance();
038            XPath xpath = xPathFactory.newXPath();
039            XPathExpression fileExp = xpath.compile("file/text()");
040            String fileStr = (String) fileExp.evaluate(elem, XPathConstants.STRING);
041            if (fileStr == null || fileStr.isEmpty()) {
042                throw new IllegalDataException(tr("File name expected for layer no. {0}", support.getLayerIndex()));
043            }
044
045            try (InputStream in = support.getInputStream(fileStr)) {
046                GpxImporter.GpxImporterData importData;
047
048                if (NMEAImporter.FILE_FILTER.acceptName(fileStr)) {
049                    importData = NMEAImporter.loadLayers(in, support.getFile(fileStr), support.getLayerName(), null);
050                } else {
051                    importData = GpxImporter.loadLayers(in, support.getFile(fileStr), support.getLayerName(), null, progressMonitor);
052                }
053
054                support.addPostLayersTask(importData.getPostLayerTask());
055                return importData.getGpxLayer();
056            }
057
058        } catch (XPathExpressionException e) {
059            throw new IllegalDataException(e);
060        }
061    }
062}