001 // License: GPL. For details, see LICENSE file. 002 package org.openstreetmap.josm.io.session; 003 004 import static org.openstreetmap.josm.tools.I18n.tr; 005 006 import java.io.IOException; 007 import java.io.InputStream; 008 009 import javax.xml.xpath.XPath; 010 import javax.xml.xpath.XPathConstants; 011 import javax.xml.xpath.XPathExpression; 012 import javax.xml.xpath.XPathExpressionException; 013 import javax.xml.xpath.XPathFactory; 014 015 import org.w3c.dom.Element; 016 017 import org.openstreetmap.josm.gui.layer.Layer; 018 import org.openstreetmap.josm.gui.progress.ProgressMonitor; 019 import org.openstreetmap.josm.io.IllegalDataException; 020 import org.openstreetmap.josm.io.OsmImporter; 021 import org.openstreetmap.josm.io.session.SessionReader.ImportSupport; 022 023 public class OsmDataSessionImporter implements SessionLayerImporter { 024 025 @Override 026 public Layer load(Element elem, ImportSupport support, ProgressMonitor progressMonitor) throws IOException, IllegalDataException { 027 String version = elem.getAttribute("version"); 028 if (!"0.1".equals(version)) { 029 throw new IllegalDataException(tr("Version ''{0}'' of meta data for osm data layer is not supported. Expected: 0.1", version)); 030 } 031 try { 032 XPathFactory xPathFactory = XPathFactory.newInstance(); 033 XPath xpath = xPathFactory.newXPath(); 034 XPathExpression fileExp = xpath.compile("file/text()"); 035 String fileStr = (String) fileExp.evaluate(elem, XPathConstants.STRING); 036 if (fileStr == null || fileStr.equals("")) { 037 throw new IllegalDataException(tr("File name expected for layer no. {0}", support.getLayerIndex())); 038 } 039 040 OsmImporter importer = new OsmImporter(); 041 InputStream in = support.getInputStream(fileStr); 042 OsmImporter.OsmImporterData importData = importer.loadLayer(in, support.getFile(fileStr), support.getLayerName(), progressMonitor); 043 044 support.addPostLayersTask(importData.getPostLayerTask()); 045 return importData.getLayer(); 046 047 } catch (XPathExpressionException e) { 048 throw new RuntimeException(e); 049 } 050 } 051 } 052