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; 008import java.util.List; 009 010import javax.xml.xpath.XPath; 011import javax.xml.xpath.XPathConstants; 012import javax.xml.xpath.XPathExpression; 013import javax.xml.xpath.XPathExpressionException; 014import javax.xml.xpath.XPathFactory; 015 016import org.openstreetmap.josm.gui.layer.GpxLayer; 017import org.openstreetmap.josm.gui.layer.Layer; 018import org.openstreetmap.josm.gui.layer.markerlayer.MarkerLayer; 019import org.openstreetmap.josm.gui.progress.ProgressMonitor; 020import org.openstreetmap.josm.io.GpxImporter; 021import org.openstreetmap.josm.io.IllegalDataException; 022import org.openstreetmap.josm.io.session.SessionReader.ImportSupport; 023import org.w3c.dom.Element; 024 025public class MarkerSessionImporter implements SessionLayerImporter { 026 027 @Override 028 public Layer load(Element elem, ImportSupport support, ProgressMonitor progressMonitor) throws IOException, IllegalDataException { 029 String version = elem.getAttribute("version"); 030 if (!"0.1".equals(version)) { 031 throw new IllegalDataException(tr("Version ''{0}'' of meta data for marker layer is not supported. Expected: 0.1", version)); 032 } 033 try { 034 XPathFactory xPathFactory = XPathFactory.newInstance(); 035 XPath xpath = xPathFactory.newXPath(); 036 XPathExpression fileExp = xpath.compile("file/text()"); 037 String fileStr = (String) fileExp.evaluate(elem, XPathConstants.STRING); 038 if (fileStr == null || fileStr.isEmpty()) { 039 throw new IllegalDataException(tr("File name expected for layer no. {0}", support.getLayerIndex())); 040 } 041 042 try (InputStream in = support.getInputStream(fileStr)) { 043 GpxImporter.GpxImporterData importData = GpxImporter.loadLayers(in, support.getFile(fileStr), support.getLayerName(), null, progressMonitor); 044 045 support.addPostLayersTask(importData.getPostLayerTask()); 046 047 GpxLayer gpxLayer = null; 048 List<SessionReader.LayerDependency> deps = support.getLayerDependencies(); 049 if (!deps.isEmpty()) { 050 Layer layer = deps.iterator().next().getLayer(); 051 if (layer instanceof GpxLayer) { 052 gpxLayer = (GpxLayer) layer; 053 } 054 } 055 056 MarkerLayer markerLayer = importData.getMarkerLayer(); 057 if (markerLayer != null) { 058 markerLayer.fromLayer = gpxLayer; 059 } 060 061 return markerLayer; 062 } 063 } catch (XPathExpressionException e) { 064 throw new IllegalDataException(e); 065 } 066 } 067}