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.openstreetmap.josm.tools.Utils;
023import org.w3c.dom.Element;
024
025/**
026 * Session exporter for {@link GpxLayer}.
027 * @since 5501
028 */
029public class GpxTracksSessionImporter implements SessionLayerImporter {
030
031    @Override
032    public Layer load(Element elem, SessionReader.ImportSupport support, ProgressMonitor progressMonitor)
033            throws IOException, IllegalDataException {
034        String version = elem.getAttribute("version");
035        if (!"0.1".equals(version)) {
036            throw new IllegalDataException(tr("Version ''{0}'' of meta data for gpx track layer is not supported. Expected: 0.1", version));
037        }
038        try {
039            XPathFactory xPathFactory = XPathFactory.newInstance();
040            XPath xpath = xPathFactory.newXPath();
041            XPathExpression fileExp = xpath.compile("file/text()");
042            String fileStr = (String) fileExp.evaluate(elem, XPathConstants.STRING);
043            if (Utils.isEmpty(fileStr)) {
044                throw new IllegalDataException(tr("File name expected for layer no. {0}", support.getLayerIndex()));
045            }
046
047            try (InputStream in = support.getInputStream(fileStr)) {
048                GpxImporter.GpxImporterData importData;
049
050                if (NMEAImporter.FILE_FILTER.acceptName(fileStr)) {
051                    importData = NMEAImporter.loadLayers(in, support.getFile(fileStr), support.getLayerName());
052                } else if (RtkLibImporter.FILE_FILTER.acceptName(fileStr)) {
053                    importData = RtkLibImporter.loadLayers(in, support.getFile(fileStr), support.getLayerName());
054                } else {
055                    importData = GpxImporter.loadLayers(in, support.getFile(fileStr), support.getLayerName(), progressMonitor);
056                }
057                if (importData.getGpxLayer() != null && importData.getGpxLayer().data != null) {
058                    importData.getGpxLayer().data.fromSession = true;
059                }
060
061                support.addPostLayersTask(importData.getPostLayerTask());
062                return getLayer(importData);
063            }
064
065        } catch (XPathExpressionException e) {
066            throw new IllegalDataException(e);
067        }
068    }
069
070    protected Layer getLayer(GpxImporter.GpxImporterData importData) {
071        return importData.getGpxLayer();
072    }
073}