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