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; 024 025/** 026 * Session importer for {@link MarkerLayer}. 027 * @since 5684 028 */ 029public class MarkerSessionImporter implements SessionLayerImporter { 030 031 @Override 032 public Layer load(Element elem, ImportSupport support, ProgressMonitor progressMonitor) 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 marker 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 = GpxImporter.loadLayers(in, support.getFile(fileStr), support.getLayerName(), 048 null, progressMonitor); 049 050 support.addPostLayersTask(importData.getPostLayerTask()); 051 052 GpxLayer gpxLayer = null; 053 List<SessionReader.LayerDependency> deps = support.getLayerDependencies(); 054 if (!deps.isEmpty()) { 055 Layer layer = deps.get(0).getLayer(); 056 if (layer instanceof GpxLayer) { 057 gpxLayer = (GpxLayer) layer; 058 } 059 } 060 061 MarkerLayer markerLayer = importData.getMarkerLayer(); 062 if (markerLayer != null) { 063 markerLayer.fromLayer = gpxLayer; 064 } 065 066 return markerLayer; 067 } 068 } catch (XPathExpressionException e) { 069 throw new IllegalDataException(e); 070 } 071 } 072}