1 | // License: GPL. Copyright 2007 by Immanuel Scholz and others
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2 | package org.openstreetmap.josm.actions.downloadtasks;
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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.IOException;
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7 | import java.util.Collection;
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8 | import java.util.concurrent.Future;
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9 | import java.util.logging.Logger;
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10 |
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11 | import org.openstreetmap.josm.Main;
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12 | import org.openstreetmap.josm.data.Bounds;
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13 | import org.openstreetmap.josm.data.coor.LatLon;
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14 | import org.openstreetmap.josm.data.osm.DataSet;
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15 | import org.openstreetmap.josm.data.osm.DataSource;
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16 | import org.openstreetmap.josm.data.osm.visitor.BoundingXYVisitor;
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17 | import org.openstreetmap.josm.gui.PleaseWaitRunnable;
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18 | import org.openstreetmap.josm.gui.layer.Layer;
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19 | import org.openstreetmap.josm.gui.layer.OsmDataLayer;
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20 | import org.openstreetmap.josm.gui.progress.ProgressMonitor;
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21 | import org.openstreetmap.josm.io.BoundingBoxDownloader;
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22 | import org.openstreetmap.josm.io.OsmServerLocationReader;
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23 | import org.openstreetmap.josm.io.OsmServerReader;
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24 | import org.openstreetmap.josm.io.OsmTransferException;
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25 | import org.xml.sax.SAXException;
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26 |
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27 | /**
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28 | * Open the download dialog and download the data.
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29 | * Run in the worker thread.
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30 | */
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31 | public class DownloadOsmTask extends AbstractDownloadTask {
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32 | private static final Logger logger = Logger.getLogger(DownloadOsmTask.class.getName());
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33 |
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34 | private Bounds currentBounds;
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35 | private DataSet downloadedData;
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36 | private DownloadTask downloadTask;
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37 |
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38 | private void rememberDownloadedData(DataSet ds) {
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39 | this.downloadedData = ds;
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40 | }
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41 |
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42 | public DataSet getDownloadedData() {
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43 | return downloadedData;
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44 | }
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45 |
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46 | public Future<?> download(boolean newLayer, Bounds downloadArea, ProgressMonitor progressMonitor) {
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47 |
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48 | downloadTask = new DownloadTask(newLayer,
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49 | new BoundingBoxDownloader(downloadArea), progressMonitor);
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50 | currentBounds = new Bounds(downloadArea);
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51 | // We need submit instead of execute so we can wait for it to finish and get the error
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52 | // message if necessary. If no one calls getErrorMessage() it just behaves like execute.
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53 | return Main.worker.submit(downloadTask);
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54 | }
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55 |
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56 | /**
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57 | * Loads a given URL from the OSM Server
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58 | * @param True if the data should be saved to a new layer
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59 | * @param The URL as String
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60 | */
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61 | public Future<?> loadUrl(boolean new_layer, String url, ProgressMonitor progressMonitor) {
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62 | downloadTask = new DownloadTask(new_layer,
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63 | new OsmServerLocationReader(url),
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64 | progressMonitor);
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65 | currentBounds = new Bounds(new LatLon(0,0), new LatLon(0,0));
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66 | return Main.worker.submit(downloadTask);
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67 | }
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68 |
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69 | public void cancel() {
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70 | if (downloadTask != null) {
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71 | downloadTask.cancel();
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72 | }
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73 | }
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74 |
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75 | private class DownloadTask extends PleaseWaitRunnable {
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76 | private OsmServerReader reader;
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77 | private DataSet dataSet;
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78 | private boolean newLayer;
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79 |
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80 | public DownloadTask(boolean newLayer, OsmServerReader reader, ProgressMonitor progressMonitor) {
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81 | super(tr("Downloading data"), progressMonitor, false);
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82 | this.reader = reader;
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83 | this.newLayer = newLayer;
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84 | }
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85 |
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86 | @Override public void realRun() throws IOException, SAXException, OsmTransferException {
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87 | try {
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88 | if (isCanceled())
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89 | return;
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90 | dataSet = reader.parseOsm(progressMonitor.createSubTaskMonitor(ProgressMonitor.ALL_TICKS, false));
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91 | } catch(Exception e) {
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92 | if (isCanceled()) {
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93 | logger.warning(tr("Ignoring exception because download has been cancelled. Exception was: {0}" + e.toString()));
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94 | return;
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95 | }
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96 | if (e instanceof OsmTransferException) {
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97 | rememberException(e);
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98 | } else {
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99 | rememberException(new OsmTransferException(e));
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100 | }
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101 | DownloadOsmTask.this.setFailed(true);
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102 | }
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103 | }
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104 |
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105 | protected OsmDataLayer getEditLayer() {
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106 | if (!Main.isDisplayingMapView()) return null;
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107 | return Main.map.mapView.getEditLayer();
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108 | }
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109 |
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110 | protected int getNumDataLayers() {
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111 | int count = 0;
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112 | if (!Main.isDisplayingMapView()) return 0;
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113 | Collection<Layer> layers = Main.map.mapView.getAllLayers();
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114 | for (Layer layer : layers) {
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115 | if (layer instanceof OsmDataLayer) {
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116 | count++;
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117 | }
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118 | }
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119 | return count;
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120 | }
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121 |
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122 | protected OsmDataLayer getFirstDataLayer() {
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123 | if (!Main.isDisplayingMapView()) return null;
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124 | Collection<Layer> layers = Main.map.mapView.getAllLayersAsList();
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125 | for (Layer layer : layers) {
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126 | if (layer instanceof OsmDataLayer)
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127 | return (OsmDataLayer) layer;
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128 | }
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129 | return null;
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130 | }
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131 |
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132 | @Override protected void finish() {
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133 | if (isFailed() || isCanceled())
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134 | return;
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135 | if (dataSet == null)
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136 | return; // user canceled download or error occurred
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137 | if (currentBounds == null)
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138 | return; // no data retrieved
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139 | if (dataSet.allPrimitives().isEmpty()) {
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140 | rememberErrorMessage(tr("No data found in this area."));
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141 | // need to synthesize a download bounds lest the visual indication of downloaded
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142 | // area doesn't work
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143 | dataSet.dataSources.add(new DataSource(currentBounds, "OpenStreetMap server"));
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144 | }
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145 | rememberDownloadedData(dataSet);
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146 | int numDataLayers = getNumDataLayers();
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147 | if (newLayer || numDataLayers == 0 || (numDataLayers > 1 && getEditLayer() == null)) {
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148 | // the user explicitly wants a new layer, we don't have any layer at all
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149 | // or it is not clear which layer to merge to
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150 | //
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151 | OsmDataLayer layer = new OsmDataLayer(dataSet, OsmDataLayer.createNewName(), null);
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152 | Main.main.addLayer(layer);
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153 | } else {
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154 | OsmDataLayer target;
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155 | target = getEditLayer();
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156 | if (target == null) {
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157 | target = getFirstDataLayer();
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158 | }
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159 | target.mergeFrom(dataSet);
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160 | BoundingXYVisitor v = new BoundingXYVisitor();
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161 | v.visit(currentBounds);
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162 | Main.map.mapView.recalculateCenterScale(v);
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163 | target.onPostDownloadFromServer();
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164 | }
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165 | }
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166 |
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167 | @Override protected void cancel() {
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168 | setCanceled(true);
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169 | if (reader != null) {
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170 | reader.cancel();
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171 | }
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172 | }
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173 | }
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174 | }
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