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}