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.io.importexport.RtkLibImporter;
018import org.openstreetmap.josm.gui.layer.GpxLayer;
019import org.openstreetmap.josm.gui.layer.Layer;
020import org.openstreetmap.josm.gui.progress.ProgressMonitor;
021import org.openstreetmap.josm.io.IllegalDataException;
022import org.w3c.dom.Element;
023
024/**
025 * Session exporter for {@link GpxLayer}.
026 * @since 5501
027 */
028public class GpxTracksSessionImporter implements SessionLayerImporter {
029
030    @Override
031    public Layer load(Element elem, SessionReader.ImportSupport support, ProgressMonitor progressMonitor)
032            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 gpx track 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 (fileStr == null || fileStr.isEmpty()) {
043                throw new IllegalDataException(tr("File name expected for layer no. {0}", support.getLayerIndex()));
044            }
045
046            try (InputStream in = support.getInputStream(fileStr)) {
047                GpxImporter.GpxImporterData importData;
048
049                if (NMEAImporter.FILE_FILTER.acceptName(fileStr)) {
050                    importData = NMEAImporter.loadLayers(in, support.getFile(fileStr), support.getLayerName(), null);
051                } else if (RtkLibImporter.FILE_FILTER.acceptName(fileStr)) {
052                    importData = RtkLibImporter.loadLayers(in, support.getFile(fileStr), support.getLayerName(), null);
053                } else {
054                    importData = GpxImporter.loadLayers(in, support.getFile(fileStr), support.getLayerName(), null, progressMonitor);
055                }
056
057                support.addPostLayersTask(importData.getPostLayerTask());
058                return importData.getGpxLayer();
059            }
060
061        } catch (XPathExpressionException e) {
062            throw new IllegalDataException(e);
063        }
064    }
065}