1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data;
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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.BufferedReader;
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7 | import java.io.File;
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8 | import java.io.FileFilter;
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9 | import java.io.FileInputStream;
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10 | import java.io.IOException;
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11 | import java.io.InputStreamReader;
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12 | import java.io.PrintStream;
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13 | import java.lang.management.ManagementFactory;
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14 | import java.util.ArrayList;
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15 | import java.util.Date;
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16 | import java.util.Deque;
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17 | import java.util.HashSet;
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18 | import java.util.Iterator;
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19 | import java.util.LinkedList;
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20 | import java.util.List;
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21 | import java.util.Set;
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22 | import java.util.Timer;
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23 | import java.util.TimerTask;
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24 | import java.util.regex.Pattern;
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25 |
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26 | import org.openstreetmap.josm.Main;
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27 | import org.openstreetmap.josm.actions.OpenFileAction.OpenFileTask;
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28 | import org.openstreetmap.josm.data.osm.DataSet;
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29 | import org.openstreetmap.josm.data.osm.event.AbstractDatasetChangedEvent;
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30 | import org.openstreetmap.josm.data.osm.event.DataSetListenerAdapter;
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31 | import org.openstreetmap.josm.data.osm.event.DataSetListenerAdapter.Listener;
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32 | import org.openstreetmap.josm.data.preferences.BooleanProperty;
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33 | import org.openstreetmap.josm.data.preferences.IntegerProperty;
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34 | import org.openstreetmap.josm.gui.MapView;
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35 | import org.openstreetmap.josm.gui.MapView.LayerChangeListener;
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36 | import org.openstreetmap.josm.gui.layer.Layer;
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37 | import org.openstreetmap.josm.gui.layer.OsmDataLayer;
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38 | import org.openstreetmap.josm.io.OsmExporter;
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39 | import org.openstreetmap.josm.io.OsmImporter;
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40 | import org.openstreetmap.josm.tools.Utils;
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41 |
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42 | /**
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43 | * Saves data layers periodically so they can be recovered in case of a crash.
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44 | *
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45 | * There are 2 directories
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46 | * - autosave dir: copies of the currently open data layers are saved here every
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47 | * PROP_INTERVAL seconds. When a data layer is closed normally, the corresponding
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48 | * files are removed. If this dir is non-empty on start, JOSM assumes
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49 | * that it crashed last time.
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50 | * - deleted layers dir: "secondary archive" - when autosaved layers are restored
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51 | * they are copied to this directory. We cannot keep them in the autosave folder,
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52 | * but just deleting it would be dangerous: Maybe a feature inside the file
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53 | * caused JOSM to crash. If the data is valuable, the user can still try to
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54 | * open with another versions of JOSM or fix the problem manually.
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55 | *
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56 | * The deleted layers dir keeps at most PROP_DELETED_LAYERS files.
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57 | */
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58 | public class AutosaveTask extends TimerTask implements LayerChangeListener, Listener {
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59 |
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60 | private static final char[] ILLEGAL_CHARACTERS = { '/', '\n', '\r', '\t', '\0', '\f', '`', '?', '*', '\\', '<', '>', '|', '\"', ':' };
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61 | private static final String AUTOSAVE_DIR = "autosave";
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62 | private static final String DELETED_LAYERS_DIR = "autosave/deleted_layers";
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63 |
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64 | public static final BooleanProperty PROP_AUTOSAVE_ENABLED = new BooleanProperty("autosave.enabled", true);
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65 | public static final IntegerProperty PROP_FILES_PER_LAYER = new IntegerProperty("autosave.filesPerLayer", 1);
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66 | public static final IntegerProperty PROP_DELETED_LAYERS = new IntegerProperty("autosave.deletedLayersBackupCount", 5);
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67 | public static final IntegerProperty PROP_INTERVAL = new IntegerProperty("autosave.interval", 5 * 60);
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68 | public static final IntegerProperty PROP_INDEX_LIMIT = new IntegerProperty("autosave.index-limit", 1000);
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69 |
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70 | private static class AutosaveLayerInfo {
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71 | OsmDataLayer layer;
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72 | String layerName;
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73 | String layerFileName;
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74 | final Deque<File> backupFiles = new LinkedList<File>();
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75 | }
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76 |
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77 | private final DataSetListenerAdapter datasetAdapter = new DataSetListenerAdapter(this);
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78 | private final Set<DataSet> changedDatasets = new HashSet<DataSet>();
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79 | private final List<AutosaveLayerInfo> layersInfo = new ArrayList<AutosaveLayerInfo>();
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80 | private Timer timer;
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81 | private final Object layersLock = new Object();
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82 | private final Deque<File> deletedLayers = new LinkedList<File>();
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83 |
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84 | private final File autosaveDir = new File(Main.pref.getPreferencesDir() + AUTOSAVE_DIR);
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85 | private final File deletedLayersDir = new File(Main.pref.getPreferencesDir() + DELETED_LAYERS_DIR);
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86 |
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87 | public void schedule() {
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88 | if (PROP_INTERVAL.get() > 0) {
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89 |
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90 | if (!autosaveDir.exists() && !autosaveDir.mkdirs()) {
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91 | Main.warn(tr("Unable to create directory {0}, autosave will be disabled", autosaveDir.getAbsolutePath()));
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92 | return;
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93 | }
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94 | if (!deletedLayersDir.exists() && !deletedLayersDir.mkdirs()) {
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95 | Main.warn(tr("Unable to create directory {0}, autosave will be disabled", deletedLayersDir.getAbsolutePath()));
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96 | return;
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97 | }
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98 |
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99 | for (File f: deletedLayersDir.listFiles()) {
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100 | deletedLayers.add(f); // FIXME: sort by mtime
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101 | }
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102 |
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103 | timer = new Timer(true);
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104 | timer.schedule(this, 1000, PROP_INTERVAL.get() * 1000);
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105 | MapView.addLayerChangeListener(this);
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106 | if (Main.isDisplayingMapView()) {
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107 | for (OsmDataLayer l: Main.map.mapView.getLayersOfType(OsmDataLayer.class)) {
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108 | registerNewlayer(l);
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109 | }
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110 | }
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111 | }
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112 | }
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113 |
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114 | private String getFileName(String layerName, int index) {
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115 | String result = layerName;
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116 | for (char illegalCharacter : ILLEGAL_CHARACTERS) {
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117 | result = result.replaceAll(Pattern.quote(String.valueOf(illegalCharacter)),
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118 | '&' + String.valueOf((int) illegalCharacter) + ';');
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119 | }
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120 | if (index != 0) {
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121 | result = result + '_' + index;
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122 | }
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123 | return result;
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124 | }
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125 |
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126 | private void setLayerFileName(AutosaveLayerInfo layer) {
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127 | int index = 0;
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128 | while (true) {
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129 | String filename = getFileName(layer.layer.getName(), index);
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130 | boolean foundTheSame = false;
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131 | for (AutosaveLayerInfo info: layersInfo) {
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132 | if (info != layer && filename.equals(info.layerFileName)) {
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133 | foundTheSame = true;
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134 | break;
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135 | }
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136 | }
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137 |
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138 | if (!foundTheSame) {
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139 | layer.layerFileName = filename;
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140 | return;
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141 | }
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142 |
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143 | index++;
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144 | }
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145 | }
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146 |
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147 | private File getNewLayerFile(AutosaveLayerInfo layer) {
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148 | int index = 0;
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149 | Date now = new Date();
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150 | while (true) {
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151 | String filename = String.format("%1$s_%2$tY%2$tm%2$td_%2$tH%2$tM%3$s", layer.layerFileName, now, index == 0?"":"_" + index);
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152 | File result = new File(autosaveDir, filename+".osm");
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153 | try {
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154 | if (result.createNewFile()) {
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155 | try {
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156 | File pidFile = new File(autosaveDir, filename+".pid");
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157 | PrintStream ps = new PrintStream(pidFile);
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158 | ps.println(ManagementFactory.getRuntimeMXBean().getName());
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159 | Utils.close(ps);
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160 | } catch (Throwable t) {
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161 | Main.error(t);
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162 | }
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163 | return result;
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164 | } else {
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165 | Main.warn(tr("Unable to create file {0}, other filename will be used", result.getAbsolutePath()));
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166 | if (index > PROP_INDEX_LIMIT.get())
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167 | throw new IOException("index limit exceeded");
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168 | }
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169 | } catch (IOException e) {
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170 | Main.error(tr("IOError while creating file, autosave will be skipped: {0}", e.getMessage()));
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171 | return null;
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172 | }
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173 | index++;
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174 | }
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175 | }
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176 |
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177 | private void savelayer(AutosaveLayerInfo info) throws IOException {
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178 | if (!info.layer.getName().equals(info.layerName)) {
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179 | setLayerFileName(info);
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180 | info.layerName = info.layer.getName();
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181 | }
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182 | if (changedDatasets.remove(info.layer.data)) {
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183 | File file = getNewLayerFile(info);
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184 | if (file != null) {
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185 | info.backupFiles.add(file);
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186 | new OsmExporter().exportData(file, info.layer, true /* no backup with appended ~ */);
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187 | }
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188 | }
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189 | while (info.backupFiles.size() > PROP_FILES_PER_LAYER.get()) {
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190 | File oldFile = info.backupFiles.remove();
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191 | if (!oldFile.delete()) {
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192 | Main.warn(tr("Unable to delete old backup file {0}", oldFile.getAbsolutePath()));
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193 | } else {
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194 | getPidFile(oldFile).delete();
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195 | }
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196 | }
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197 | }
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198 |
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199 | @Override
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200 | public void run() {
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201 | synchronized (layersLock) {
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202 | try {
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203 | for (AutosaveLayerInfo info: layersInfo) {
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204 | savelayer(info);
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205 | }
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206 | changedDatasets.clear();
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207 | } catch (Throwable t) {
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208 | // Don't let exception stop time thread
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209 | Main.error("Autosave failed:");
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210 | Main.error(t);
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211 | t.printStackTrace();
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212 | }
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213 | }
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214 | }
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215 |
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216 | @Override
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217 | public void activeLayerChange(Layer oldLayer, Layer newLayer) {
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218 | // Do nothing
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219 | }
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220 |
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221 | private void registerNewlayer(OsmDataLayer layer) {
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222 | synchronized (layersLock) {
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223 | layer.data.addDataSetListener(datasetAdapter);
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224 | AutosaveLayerInfo info = new AutosaveLayerInfo();
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225 | info.layer = layer;
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226 | layersInfo.add(info);
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227 | }
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228 | }
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229 |
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230 | @Override
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231 | public void layerAdded(Layer newLayer) {
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232 | if (newLayer instanceof OsmDataLayer) {
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233 | registerNewlayer((OsmDataLayer) newLayer);
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234 | }
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235 | }
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236 |
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237 | @Override
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238 | public void layerRemoved(Layer oldLayer) {
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239 | if (oldLayer instanceof OsmDataLayer) {
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240 | synchronized (layersLock) {
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241 | OsmDataLayer osmLayer = (OsmDataLayer) oldLayer;
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242 | osmLayer.data.removeDataSetListener(datasetAdapter);
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243 | Iterator<AutosaveLayerInfo> it = layersInfo.iterator();
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244 | while (it.hasNext()) {
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245 | AutosaveLayerInfo info = it.next();
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246 | if (info.layer == osmLayer) {
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247 |
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248 | try {
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249 | savelayer(info);
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250 | File lastFile = info.backupFiles.pollLast();
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251 | if (lastFile != null) {
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252 | moveToDeletedLayersFolder(lastFile);
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253 | }
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254 | for (File file: info.backupFiles) {
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255 | if (file.delete()) {
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256 | getPidFile(file).delete();
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257 | }
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258 | }
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259 | } catch (IOException e) {
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260 | Main.error(tr("Error while creating backup of removed layer: {0}", e.getMessage()));
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261 | }
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262 |
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263 | it.remove();
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264 | }
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265 | }
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266 | }
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267 | }
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268 | }
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269 |
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270 | @Override
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271 | public void processDatasetEvent(AbstractDatasetChangedEvent event) {
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272 | changedDatasets.add(event.getDataset());
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273 | }
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274 |
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275 | private final File getPidFile(File osmFile) {
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276 | return new File(autosaveDir, osmFile.getName().replaceFirst("[.][^.]+$", ".pid"));
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277 | }
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278 |
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279 | /**
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280 | * Replies the list of .osm files still present in autosave dir, that are not currently managed by another instance of JOSM.
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281 | * These files are hence unsaved layers from an old instance of JOSM that crashed and may be recovered by this instance.
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282 | * @return The list of .osm files still present in autosave dir, that are not currently managed by another instance of JOSM
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283 | */
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284 | public List<File> getUnsavedLayersFiles() {
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285 | List<File> result = new ArrayList<File>();
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286 | File[] files = autosaveDir.listFiles(OsmImporter.FILE_FILTER);
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287 | if (files == null)
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288 | return result;
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289 | for (File file: files) {
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290 | if (file.isFile()) {
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291 | boolean skipFile = false;
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292 | File pidFile = getPidFile(file);
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293 | if (pidFile.exists()) {
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294 | try {
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295 | BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(pidFile)));
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296 | try {
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297 | String jvmId = reader.readLine();
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298 | if (jvmId != null) {
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299 | String pid = jvmId.split("@")[0];
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300 | skipFile = jvmPerfDataFileExists(pid);
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301 | }
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302 | } catch (Throwable t) {
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303 | Main.error(t);
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304 | } finally {
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305 | Utils.close(reader);
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306 | }
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307 | } catch (Throwable t) {
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308 | Main.error(t);
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309 | }
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310 | }
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311 | if (!skipFile) {
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312 | result.add(file);
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313 | }
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314 | }
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315 | }
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316 | return result;
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317 | }
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318 |
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319 | private boolean jvmPerfDataFileExists(final String jvmId) {
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320 | File jvmDir = new File(System.getProperty("java.io.tmpdir") + File.separator + "hsperfdata_" + System.getProperty("user.name"));
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321 | if (jvmDir.exists() && jvmDir.canRead()) {
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322 | File[] files = jvmDir.listFiles(new FileFilter() {
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323 | @Override
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324 | public boolean accept(File file) {
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325 | return file.getName().equals(jvmId) && file.isFile();
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326 | }
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327 | });
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328 | return files != null && files.length == 1;
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329 | }
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330 | return false;
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331 | }
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332 |
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333 | public void recoverUnsavedLayers() {
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334 | List<File> files = getUnsavedLayersFiles();
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335 | final OpenFileTask openFileTsk = new OpenFileTask(files, null, tr("Restoring files"));
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336 | Main.worker.submit(openFileTsk);
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337 | Main.worker.submit(new Runnable() {
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338 | @Override
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339 | public void run() {
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340 | for (File f: openFileTsk.getSuccessfullyOpenedFiles()) {
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341 | moveToDeletedLayersFolder(f);
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342 | }
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343 | }
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344 | });
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345 | }
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346 |
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347 | /**
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348 | * Move file to the deleted layers directory.
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349 | * If moving does not work, it will try to delete the file directly.
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350 | * Afterwards, if the number of deleted layers gets larger than PROP_DELETED_LAYERS,
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351 | * some files in the deleted layers directory will be removed.
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352 | *
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353 | * @param f the file, usually from the autosave dir
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354 | */
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355 | private void moveToDeletedLayersFolder(File f) {
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356 | File backupFile = new File(deletedLayersDir, f.getName());
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357 | File pidFile = getPidFile(f);
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358 |
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359 | if (backupFile.exists()) {
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360 | deletedLayers.remove(backupFile);
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361 | if (!backupFile.delete()) {
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362 | Main.warn(String.format("Could not delete old backup file %s", backupFile));
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363 | }
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364 | }
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365 | if (f.renameTo(backupFile)) {
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366 | deletedLayers.add(backupFile);
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367 | pidFile.delete();
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368 | } else {
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369 | Main.warn(String.format("Could not move autosaved file %s to %s folder", f.getName(), deletedLayersDir.getName()));
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370 | // we cannot move to deleted folder, so just try to delete it directly
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371 | if (!f.delete()) {
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372 | Main.warn(String.format("Could not delete backup file %s", f));
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373 | } else {
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374 | pidFile.delete();
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375 | }
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376 | }
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377 | while (deletedLayers.size() > PROP_DELETED_LAYERS.get()) {
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378 | File next = deletedLayers.remove();
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379 | if (next == null) {
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380 | break;
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381 | }
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382 | if (!next.delete()) {
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383 | Main.warn(String.format("Could not delete archived backup file %s", next));
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384 | }
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385 | }
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386 | }
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387 |
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388 | public void dicardUnsavedLayers() {
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389 | for (File f: getUnsavedLayersFiles()) {
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390 | moveToDeletedLayersFolder(f);
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391 | }
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392 | }
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393 | }
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