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.layer.Layer; 017import org.openstreetmap.josm.gui.layer.markerlayer.MarkerLayer; 018import org.openstreetmap.josm.gui.progress.ProgressMonitor; 019import org.openstreetmap.josm.io.IllegalDataException; 020import org.openstreetmap.josm.io.session.SessionReader.ImportSupport; 021import org.openstreetmap.josm.tools.Utils; 022import org.w3c.dom.Element; 023 024/** 025 * Session importer for {@link MarkerLayer}. 026 * @since 5684 027 */ 028public class MarkerSessionImporter implements SessionLayerImporter { 029 030 @Override 031 public Layer load(Element elem, ImportSupport support, ProgressMonitor progressMonitor) 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 marker 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 (Utils.isEmpty(fileStr)) { 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 = GpxImporter.loadLayers(in, support.getFile(fileStr), support.getLayerName(), 047 progressMonitor); 048 049 support.addPostLayersTask(importData.getPostLayerTask()); 050 051 return importData.getMarkerLayer(); 052 } 053 } catch (XPathExpressionException e) { 054 throw new IllegalDataException(e); 055 } 056 } 057}