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