| 1 | // License: GPL. For details, see LICENSE file.
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| 2 | package org.openstreetmap.josm.io;
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| 3 |
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| 4 | import static org.openstreetmap.josm.tools.I18n.tr;
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| 5 |
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| 6 | import java.io.File;
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| 7 | import java.io.FileInputStream;
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| 8 | import java.io.FileNotFoundException;
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| 9 | import java.io.FileOutputStream;
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| 10 | import java.io.IOException;
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| 11 | import java.io.OutputStream;
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| 12 | import java.io.OutputStreamWriter;
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| 13 | import java.io.PrintWriter;
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| 14 | import java.io.Writer;
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| 15 | import java.text.MessageFormat;
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| 16 |
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| 17 | import javax.swing.JOptionPane;
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| 18 |
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| 19 | import org.openstreetmap.josm.Main;
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| 20 | import org.openstreetmap.josm.actions.ExtensionFileFilter;
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| 21 | import org.openstreetmap.josm.gui.layer.Layer;
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| 22 | import org.openstreetmap.josm.gui.layer.OsmDataLayer;
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| 23 |
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| 24 | public class OsmExporter extends FileExporter {
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| 25 |
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| 26 | public OsmExporter() {
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| 27 | super(new ExtensionFileFilter("osm,xml", "osm", tr("OSM Server Files") + " (*.osm *.xml)"));
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| 28 | }
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| 29 |
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| 30 | public OsmExporter(ExtensionFileFilter filter) {
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| 31 | super(filter);
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| 32 | }
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| 33 |
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| 34 | @Override
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| 35 | public boolean acceptFile(File pathname, Layer layer) {
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| 36 | if (!(layer instanceof OsmDataLayer))
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| 37 | return false;
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| 38 | return super.acceptFile(pathname, layer);
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| 39 | }
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| 40 |
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| 41 | @Override
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| 42 | public void exportData(File file, Layer layer) throws IOException {
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| 43 | if (layer instanceof OsmDataLayer) {
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| 44 | save(file, (OsmDataLayer) layer);
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| 45 | } else
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| 46 | throw new IllegalArgumentException(MessageFormat.format("Expected instance of OsmDataLayer. Got ''{0}''.", layer
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| 47 | .getClass().getName()));
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| 48 | }
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| 49 |
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| 50 | protected OutputStream getOutputStream(File file) throws FileNotFoundException, IOException {
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| 51 | return new FileOutputStream(file);
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| 52 | }
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| 53 |
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| 54 | private void save(File file, OsmDataLayer layer) {
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| 55 | File tmpFile = null;
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| 56 | try {
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| 57 | // use a tmp file because if something errors out in the
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| 58 | // process of writing the file, we might just end up with
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| 59 | // a truncated file. That can destroy lots of work.
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| 60 | if (file.exists()) {
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| 61 | tmpFile = new File(file.getPath() + "~");
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| 62 | copy(file, tmpFile);
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| 63 | }
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| 64 |
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| 65 | // create outputstream and wrap it with gzip or bzip, if necessary
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| 66 | OutputStream out = getOutputStream(file);
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| 67 | Writer writer = new OutputStreamWriter(out, "UTF-8");
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| 68 |
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| 69 | OsmWriter w = OsmWriterFactory.createOsmWriter(new PrintWriter(writer), false, layer.data.getVersion());
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| 70 | layer.data.getReadLock().lock();
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| 71 | try {
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| 72 | w.header();
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| 73 | w.writeDataSources(layer.data);
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| 74 | w.writeContent(layer.data);
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| 75 | w.footer();
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| 76 | w.close();
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| 77 | } finally {
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| 78 | layer.data.getReadLock().unlock();
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| 79 | }
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| 80 | // FIXME - how to close?
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| 81 | if (!Main.pref.getBoolean("save.keepbackup", false) && (tmpFile != null)) {
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| 82 | tmpFile.delete();
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| 83 | }
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| 84 | layer.onPostSaveToFile();
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| 85 | } catch (IOException e) {
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| 86 | e.printStackTrace();
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| 87 | JOptionPane.showMessageDialog(
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| 88 | Main.parent,
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| 89 | tr("<html>An error occurred while saving.<br>Error is:<br>{0}</html>", e.getMessage()),
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| 90 | tr("Error"),
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| 91 | JOptionPane.ERROR_MESSAGE
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| 92 | );
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| 93 |
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| 94 | try {
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| 95 | // if the file save failed, then the tempfile will not
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| 96 | // be deleted. So, restore the backup if we made one.
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| 97 | if (tmpFile != null && tmpFile.exists()) {
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| 98 | copy(tmpFile, file);
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| 99 | }
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| 100 | } catch (IOException e2) {
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| 101 | e2.printStackTrace();
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| 102 | JOptionPane.showMessageDialog(
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| 103 | Main.parent,
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| 104 | tr("<html>An error occurred while restoring backup file.<br>Error is:<br>{0}</html>", e2.getMessage()),
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| 105 | tr("Error"),
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| 106 | JOptionPane.ERROR_MESSAGE
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| 107 | );
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| 108 | }
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| 109 | }
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| 110 | }
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| 111 |
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| 112 | private void copy(File src, File dst) throws IOException {
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| 113 | FileInputStream srcStream;
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| 114 | FileOutputStream dstStream;
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| 115 | try {
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| 116 | srcStream = new FileInputStream(src);
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| 117 | dstStream = new FileOutputStream(dst);
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| 118 | } catch (FileNotFoundException e) {
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| 119 | JOptionPane.showMessageDialog(Main.parent, tr("Could not back up file. Exception is: {0}", e
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| 120 | .getMessage()), tr("Error"), JOptionPane.ERROR_MESSAGE);
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| 121 | return;
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| 122 | }
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| 123 | byte buf[] = new byte[1 << 16];
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| 124 | int len;
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| 125 | while ((len = srcStream.read(buf)) != -1) {
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| 126 | dstStream.write(buf, 0, len);
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| 127 | }
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| 128 | srcStream.close();
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| 129 | dstStream.close();
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| 130 | }
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| 131 |
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| 132 | }
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