| 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.FileNotFoundException;
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| 8 | import java.io.IOException;
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| 9 | import java.io.OutputStream;
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| 10 | import java.io.OutputStreamWriter;
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| 11 | import java.io.PrintWriter;
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| 12 | import java.io.Writer;
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| 13 | import java.nio.charset.StandardCharsets;
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| 14 | import java.text.MessageFormat;
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| 15 |
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| 16 | import javax.swing.JOptionPane;
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| 17 |
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| 18 | import org.openstreetmap.josm.Main;
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| 19 | import org.openstreetmap.josm.actions.ExtensionFileFilter;
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| 20 | import org.openstreetmap.josm.gui.layer.Layer;
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| 21 | import org.openstreetmap.josm.gui.layer.OsmDataLayer;
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| 22 | import org.openstreetmap.josm.tools.Utils;
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| 23 |
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| 24 | /**
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| 25 | * Exports data to an .osm file.
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| 26 | * @since 1949
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| 27 | */
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| 28 | public class OsmExporter extends FileExporter {
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| 29 |
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| 30 | /**
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| 31 | * Constructs a new {@code OsmExporter}.
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| 32 | */
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| 33 | public OsmExporter() {
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| 34 | super(OsmImporter.FILE_FILTER);
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| 35 | }
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| 36 |
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| 37 | /**
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| 38 | * Constructs a new {@code OsmExporter}.
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| 39 | * @param filter The extension file filter
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| 40 | */
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| 41 | public OsmExporter(ExtensionFileFilter filter) {
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| 42 | super(filter);
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| 43 | }
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| 44 |
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| 45 | @Override
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| 46 | public boolean acceptFile(File pathname, Layer layer) {
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| 47 | if (!(layer instanceof OsmDataLayer))
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| 48 | return false;
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| 49 | return super.acceptFile(pathname, layer);
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| 50 | }
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| 51 |
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| 52 | @Override
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| 53 | public void exportData(File file, Layer layer) throws IOException {
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| 54 | exportData(file, layer, false);
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| 55 | }
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| 56 |
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| 57 | /**
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| 58 | * Exports OSM data to the given file.
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| 59 | * @param file Output file
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| 60 | * @param layer Data layer. Must be an instance of {@link OsmDataLayer}.
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| 61 | * @param noBackup if {@code true}, the potential backup file created if the output file already exists will be deleted
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| 62 | * after a successful export
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| 63 | * @throws IllegalArgumentException if {@code layer} is not an instance of {@code OsmDataLayer}
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| 64 | */
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| 65 | public void exportData(File file, Layer layer, boolean noBackup) {
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| 66 | checkOsmDataLayer(layer);
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| 67 | save(file, (OsmDataLayer) layer, noBackup);
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| 68 | }
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| 69 |
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| 70 | protected static void checkOsmDataLayer(Layer layer) {
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| 71 | if (!(layer instanceof OsmDataLayer)) {
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| 72 | throw new IllegalArgumentException(MessageFormat.format("Expected instance of OsmDataLayer. Got ''{0}''.", layer
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| 73 | .getClass().getName()));
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| 74 | }
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| 75 | }
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| 76 |
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| 77 | protected static OutputStream getOutputStream(File file) throws FileNotFoundException, IOException {
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| 78 | return Compression.getCompressedFileOutputStream(file);
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| 79 | }
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| 80 |
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| 81 | private void save(File file, OsmDataLayer layer, boolean noBackup) {
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| 82 | File tmpFile = null;
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| 83 | try {
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| 84 | // use a tmp file because if something errors out in the
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| 85 | // process of writing the file, we might just end up with
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| 86 | // a truncated file. That can destroy lots of work.
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| 87 | if (file.exists()) {
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| 88 | tmpFile = new File(file.getPath() + "~");
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| 89 | Utils.copyFile(file, tmpFile);
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| 90 | }
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| 91 |
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| 92 | doSave(file, layer);
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| 93 | if (noBackup || !Main.pref.getBoolean("save.keepbackup", false)) {
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| 94 | if (tmpFile != null) {
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| 95 | tmpFile.delete();
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| 96 | }
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| 97 | }
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| 98 | layer.onPostSaveToFile();
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| 99 | } catch (IOException e) {
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| 100 | Main.error(e);
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| 101 | JOptionPane.showMessageDialog(
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| 102 | Main.parent,
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| 103 | tr("<html>An error occurred while saving.<br>Error is:<br>{0}</html>", e.getMessage()),
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| 104 | tr("Error"),
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| 105 | JOptionPane.ERROR_MESSAGE
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| 106 | );
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| 107 |
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| 108 | try {
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| 109 | // if the file save failed, then the tempfile will not
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| 110 | // be deleted. So, restore the backup if we made one.
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| 111 | if (tmpFile != null && tmpFile.exists()) {
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| 112 | Utils.copyFile(tmpFile, file);
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| 113 | }
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| 114 | } catch (IOException e2) {
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| 115 | Main.error(e2);
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| 116 | JOptionPane.showMessageDialog(
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| 117 | Main.parent,
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| 118 | tr("<html>An error occurred while restoring backup file.<br>Error is:<br>{0}</html>", e2.getMessage()),
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| 119 | tr("Error"),
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| 120 | JOptionPane.ERROR_MESSAGE
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| 121 | );
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| 122 | }
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| 123 | }
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| 124 | }
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| 125 |
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| 126 | protected void doSave(File file, OsmDataLayer layer) throws IOException, FileNotFoundException {
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| 127 | // create outputstream and wrap it with gzip or bzip, if necessary
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| 128 | try (
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| 129 | OutputStream out = getOutputStream(file);
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| 130 | Writer writer = new OutputStreamWriter(out, StandardCharsets.UTF_8);
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| 131 | OsmWriter w = OsmWriterFactory.createOsmWriter(new PrintWriter(writer), false, layer.data.getVersion());
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| 132 | ) {
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| 133 | layer.data.getReadLock().lock();
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| 134 | try {
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| 135 | w.writeLayer(layer);
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| 136 | } finally {
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| 137 | layer.data.getReadLock().unlock();
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| 138 | }
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| 139 | }
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| 140 | }
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| 141 | }
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