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.OsmImporter; 016import org.openstreetmap.josm.gui.layer.Layer; 017import org.openstreetmap.josm.gui.layer.OsmDataLayer; 018import org.openstreetmap.josm.gui.progress.ProgressMonitor; 019import org.openstreetmap.josm.io.IllegalDataException; 020import org.openstreetmap.josm.io.session.SessionReader.ImportSupport; 021import org.w3c.dom.Element; 022 023/** 024 * Session importer for {@link OsmDataLayer}. 025 * @since 4685 026 */ 027public class OsmDataSessionImporter implements SessionLayerImporter { 028 029 @Override 030 public Layer load(Element elem, ImportSupport support, ProgressMonitor progressMonitor) throws IOException, IllegalDataException { 031 String version = elem.getAttribute("version"); 032 if (!"0.1".equals(version)) { 033 throw new IllegalDataException(tr("Version ''{0}'' of meta data for osm data layer is not supported. Expected: 0.1", version)); 034 } 035 try { 036 XPathFactory xPathFactory = XPathFactory.newInstance(); 037 XPath xpath = xPathFactory.newXPath(); 038 XPathExpression fileExp = xpath.compile("file/text()"); 039 String fileStr = (String) fileExp.evaluate(elem, XPathConstants.STRING); 040 if (fileStr == null || fileStr.isEmpty()) { 041 throw new IllegalDataException(tr("File name expected for layer no. {0}", support.getLayerIndex())); 042 } 043 044 OsmImporter importer = new OsmImporter(); 045 try (InputStream in = support.getInputStream(fileStr)) { 046 OsmImporter.OsmImporterData importData = importer.loadLayer(in, support.getFile(fileStr), support.getLayerName(), 047 progressMonitor); 048 049 support.addPostLayersTask(importData.getPostLayerTask()); 050 return importData.getLayer(); 051 } 052 } catch (XPathExpressionException e) { 053 throw new IllegalDataException(e); 054 } 055 } 056}