1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.dialogs.changeset;
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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.awt.Component;
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7 | import java.io.IOException;
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8 | import java.util.ArrayList;
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9 | import java.util.Collection;
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10 | import java.util.Collections;
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11 | import java.util.HashSet;
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12 | import java.util.List;
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13 | import java.util.Set;
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14 |
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15 | import org.openstreetmap.josm.data.osm.Changeset;
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16 | import org.openstreetmap.josm.data.osm.ChangesetCache;
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17 | import org.openstreetmap.josm.data.osm.ChangesetDataSet;
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18 | import org.openstreetmap.josm.gui.ExceptionDialogUtil;
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19 | import org.openstreetmap.josm.gui.PleaseWaitRunnable;
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20 | import org.openstreetmap.josm.io.OsmServerChangesetReader;
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21 | import org.openstreetmap.josm.io.OsmTransferCancelledException;
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22 | import org.openstreetmap.josm.io.OsmTransferException;
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23 | import org.xml.sax.SAXException;
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24 |
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25 | /**
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26 | * This is an asynchronous task for downloading the changeset content of a collection of
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27 | * changesets.
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28 | *
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29 | */
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30 | public class ChangesetContentDownloadTask extends PleaseWaitRunnable implements ChangesetDownloadTask{
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31 |
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32 | /** the list of changeset ids to download */
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33 | private final List<Integer> toDownload = new ArrayList<Integer>();
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34 | /** true if the task was canceled */
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35 | private boolean canceled;
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36 | /** keeps the last exception thrown in the task, if any */
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37 | private Exception lastException;
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38 | /** the reader object used to read changesets from the API */
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39 | private OsmServerChangesetReader reader;
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40 | /** the set of downloaded changesets */
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41 | private Set<Changeset> downloadedChangesets;
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42 |
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43 | /**
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44 | * Initialize the task with a collection of changeset ids to download
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45 | *
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46 | * @param ids the collection of ids. May be null.
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47 | */
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48 | protected void init(Collection<Integer> ids) {
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49 | if (ids == null) {
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50 | ids = Collections.emptyList();
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51 | }
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52 | for (Integer id: ids) {
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53 | if (id == null || id <= 0) {
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54 | continue;
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55 | }
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56 | toDownload.add(id);
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57 | }
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58 | downloadedChangesets = new HashSet<Changeset>();
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59 | }
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60 |
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61 | /**
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62 | * Creates a download task for a single changeset
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63 | *
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64 | * @param changesetId the changeset id. >0 required.
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65 | * @throws IllegalArgumentException thrown if changesetId <= 0
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66 | */
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67 | public ChangesetContentDownloadTask(int changesetId) throws IllegalArgumentException{
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68 | super(tr("Downloading changeset content"), false /* don't ignore exceptions */);
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69 | if (changesetId <= 0)
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70 | throw new IllegalArgumentException(tr("Expected integer value > 0 for parameter ''{0}'', got ''{1}''", "changesetId", changesetId));
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71 | init(Collections.singleton(changesetId));
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72 | }
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73 |
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74 | /**
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75 | * Creates a download task for a collection of changesets. null values and id <=0 in
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76 | * the collection are sillently discarded.
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77 | *
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78 | * @param changesetIds the changeset ids. Empty collection assumed, if null.
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79 | */
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80 | public ChangesetContentDownloadTask(Collection<Integer> changesetIds) {
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81 | super(tr("Downloading changeset content"), false /* don't ignore exceptions */);
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82 | init(changesetIds);
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83 | }
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84 |
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85 | /**
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86 | * Creates a download task for a single changeset
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87 | *
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88 | * @param parent the parent component for the {@see PleaseWaitDialog}. Must not be null.
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89 | * @param changesetId the changeset id. >0 required.
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90 | * @throws IllegalArgumentException thrown if changesetId <= 0
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91 | * @throws IllegalArgumentException thrown if parent is null
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92 | */
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93 | public ChangesetContentDownloadTask(Component parent, int changesetId) throws IllegalArgumentException{
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94 | super(parent, tr("Downloading changeset content"), false /* don't ignore exceptions */);
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95 | if (changesetId <= 0)
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96 | throw new IllegalArgumentException(tr("Expected integer value > 0 for parameter ''{0}'', got ''{1}''", "changesetId", changesetId));
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97 | init(Collections.singleton(changesetId));
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98 | }
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99 |
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100 | /**
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101 | * Creates a download task for a collection of changesets. null values and id <=0 in
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102 | * the collection are sillently discarded.
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103 | *
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104 | * @param parent the parent component for the {@see PleaseWaitDialog}. Must not be null.
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105 | * @param changesetIds the changeset ids. Empty collection assumed, if null.
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106 | * @throws IllegalArgumentException thrown if parent is null
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107 | */
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108 | public ChangesetContentDownloadTask(Component parent, Collection<Integer> changesetIds) throws IllegalArgumentException {
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109 | super(parent, tr("Downloading changeset content"), false /* don't ignore exceptions */);
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110 | init(changesetIds);
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111 | }
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112 |
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113 | /**
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114 | * Replies true if the local {@see ChangesetCache} already includes the changeset with
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115 | * id <code>changesetId</code>.
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116 | *
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117 | * @param changsetId the changeset id
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118 | * @return true if the local {@see ChangesetCache} already includes the changeset with
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119 | * id <code>changesetId</code>
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120 | */
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121 | protected boolean isAvailableLocally(int changsetId) {
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122 | return ChangesetCache.getInstance().get(changsetId) != null;
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123 | }
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124 |
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125 | /**
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126 | * Downloads the changeset with id <code>changesetId</code> (only "header"
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127 | * information, no content)
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128 | *
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129 | * @param changesetId the changeset id
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130 | * @throws OsmTransferException thrown if something went wrong
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131 | */
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132 | protected void downloadChangeset(int changesetId) throws OsmTransferException {
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133 | synchronized(this) {
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134 | reader = new OsmServerChangesetReader();
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135 | }
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136 | Changeset cs = reader.readChangeset(changesetId, getProgressMonitor().createSubTaskMonitor(0, false));
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137 | synchronized(this) {
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138 | reader = null;
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139 | }
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140 | ChangesetCache.getInstance().update(cs);
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141 | }
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142 |
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143 | @Override
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144 | protected void cancel() {
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145 | canceled = true;
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146 | synchronized (this) {
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147 | if (reader != null) {
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148 | reader.cancel();
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149 | }
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150 | }
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151 | }
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152 |
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153 | @Override
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154 | protected void finish() {
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155 | if (canceled) return;
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156 | if (lastException != null) {
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157 | ExceptionDialogUtil.explainException(lastException);
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158 | }
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159 | }
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160 |
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161 | @Override
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162 | protected void realRun() throws SAXException, IOException, OsmTransferException {
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163 | try {
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164 | getProgressMonitor().setTicksCount(toDownload.size());
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165 | int i=0;
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166 | for (int id: toDownload) {
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167 | i++;
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168 | if (!isAvailableLocally(id)) {
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169 | getProgressMonitor().setCustomText(tr("({0}/{1}) Downloading changeset {2}...", i, toDownload.size(), id));
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170 | downloadChangeset(id);
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171 | }
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172 | if (canceled) return;
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173 | synchronized(this) {
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174 | reader = new OsmServerChangesetReader();
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175 | }
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176 | getProgressMonitor().setCustomText(tr("({0}/{1}) Downloading content for changeset {2}...", i, toDownload.size(), id));
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177 | ChangesetDataSet ds = reader.downloadChangeset(id, getProgressMonitor().createSubTaskMonitor(0, false));
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178 | synchronized(this) {
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179 | reader = null;
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180 | }
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181 | Changeset cs = ChangesetCache.getInstance().get(id);
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182 | cs.setContent(ds);
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183 | ChangesetCache.getInstance().update(cs);
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184 | downloadedChangesets.add(cs);
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185 | getProgressMonitor().worked(1);
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186 | }
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187 | } catch(OsmTransferCancelledException e) {
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188 | // the download was cancelled by the user. This exception is caught if the
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189 | // user canceled the authentication dialog.
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190 | //
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191 | canceled = true;
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192 | return;
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193 | } catch(OsmTransferException e) {
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194 | if (canceled)
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195 | return;
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196 | lastException = e;
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197 | } catch(RuntimeException e) {
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198 | throw e;
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199 | }
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200 | }
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201 |
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202 | /* ------------------------------------------------------------------------------- */
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203 | /* interface ChangesetDownloadTask */
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204 | /* ------------------------------------------------------------------------------- */
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205 | public Set<Changeset> getDownloadedChangesets() {
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206 | return downloadedChangesets;
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207 | }
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208 |
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209 | public boolean isCanceled() {
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210 | return canceled;
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211 | }
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212 |
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213 | public boolean isFailed() {
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214 | return lastException != null;
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215 | }
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216 | }
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