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.layer.Layer; 016import org.openstreetmap.josm.gui.progress.ProgressMonitor; 017import org.openstreetmap.josm.io.IllegalDataException; 018import org.openstreetmap.josm.io.OsmImporter; 019import org.openstreetmap.josm.io.session.SessionReader.ImportSupport; 020import org.w3c.dom.Element; 021 022public class OsmDataSessionImporter implements SessionLayerImporter { 023 024 @Override 025 public Layer load(Element elem, ImportSupport support, ProgressMonitor progressMonitor) throws IOException, IllegalDataException { 026 String version = elem.getAttribute("version"); 027 if (!"0.1".equals(version)) { 028 throw new IllegalDataException(tr("Version ''{0}'' of meta data for osm data layer is not supported. Expected: 0.1", version)); 029 } 030 try { 031 XPathFactory xPathFactory = XPathFactory.newInstance(); 032 XPath xpath = xPathFactory.newXPath(); 033 XPathExpression fileExp = xpath.compile("file/text()"); 034 String fileStr = (String) fileExp.evaluate(elem, XPathConstants.STRING); 035 if (fileStr == null || fileStr.isEmpty()) { 036 throw new IllegalDataException(tr("File name expected for layer no. {0}", support.getLayerIndex())); 037 } 038 039 OsmImporter importer = new OsmImporter(); 040 try (InputStream in = support.getInputStream(fileStr)) { 041 OsmImporter.OsmImporterData importData = importer.loadLayer(in, support.getFile(fileStr), support.getLayerName(), 042 progressMonitor); 043 044 support.addPostLayersTask(importData.getPostLayerTask()); 045 return importData.getLayer(); 046 } 047 } catch (XPathExpressionException e) { 048 throw new IllegalDataException(e); 049 } 050 } 051} 052