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}