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.w3c.dom.Element;
016
017import org.openstreetmap.josm.gui.layer.Layer;
018import org.openstreetmap.josm.gui.progress.ProgressMonitor;
019import org.openstreetmap.josm.io.IllegalDataException;
020import org.openstreetmap.josm.io.OsmImporter;
021import org.openstreetmap.josm.io.session.SessionReader.ImportSupport;
022
023public 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.isEmpty()) {
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