1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data.osm;
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3 |
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4 | import java.util.ArrayList;
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5 | import java.util.Collection;
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6 | import java.util.HashMap;
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7 | import java.util.HashSet;
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8 | import java.util.List;
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9 | import java.util.Map;
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10 | import java.util.Set;
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11 | import java.util.concurrent.CopyOnWriteArrayList;
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12 |
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13 | import javax.swing.SwingUtilities;
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14 |
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15 | import org.openstreetmap.josm.Main;
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16 | import org.openstreetmap.josm.data.Preferences.PreferenceChangeEvent;
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17 | import org.openstreetmap.josm.data.Preferences.PreferenceChangedListener;
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18 |
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19 | /**
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20 | * ChangesetCache is global in-memory cache for changesets downloaded from
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21 | * an OSM API server. The unique instance is available as singleton, see
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22 | * {@link #getInstance()}.
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23 | *
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24 | * Clients interested in cache updates can register for {@link ChangesetCacheEvent}s
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25 | * using {@link #addChangesetCacheListener(ChangesetCacheListener)}. They can use
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26 | * {@link #removeChangesetCacheListener(ChangesetCacheListener)} to unregister as
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27 | * cache event listener.
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28 | *
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29 | * The cache itself listens to {@link java.util.prefs.PreferenceChangeEvent}s. It
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30 | * clears itself if the OSM API URL is changed in the preferences.
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31 | *
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32 | * {@link ChangesetCacheEvent}s are delivered on the EDT.
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33 | *
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34 | */
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35 | public class ChangesetCache implements PreferenceChangedListener{
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36 | /** the unique instance */
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37 | static private final ChangesetCache instance = new ChangesetCache();
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38 |
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39 | /**
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40 | * Replies the unique instance of the cache
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41 | *
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42 | * @return the unique instance of the cache
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43 | */
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44 | public static ChangesetCache getInstance() {
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45 | return instance;
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46 | }
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47 |
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48 | /** the cached changesets */
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49 | private final Map<Integer, Changeset> cache = new HashMap<Integer, Changeset>();
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50 |
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51 | private final CopyOnWriteArrayList<ChangesetCacheListener> listeners =
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52 | new CopyOnWriteArrayList<ChangesetCacheListener>();
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53 |
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54 | private ChangesetCache() {
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55 | Main.pref.addPreferenceChangeListener(this);
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56 | }
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57 |
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58 | public void addChangesetCacheListener(ChangesetCacheListener listener) {
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59 | listeners.addIfAbsent(listener);
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60 | }
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61 |
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62 | public void removeChangesetCacheListener(ChangesetCacheListener listener) {
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63 | listeners.remove(listener);
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64 | }
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65 |
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66 | protected void fireChangesetCacheEvent(final ChangesetCacheEvent e) {
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67 | Runnable r = new Runnable() {
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68 | public void run() {
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69 | for(ChangesetCacheListener l: listeners) {
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70 | l.changesetCacheUpdated(e);
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71 | }
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72 | }
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73 | };
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74 | if (SwingUtilities.isEventDispatchThread()) {
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75 | r.run();
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76 | } else {
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77 | SwingUtilities.invokeLater(r);
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78 | }
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79 | }
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80 |
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81 | protected void update(Changeset cs, DefaultChangesetCacheEvent e) {
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82 | if (cs == null) return;
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83 | if (cs.isNew()) return;
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84 | Changeset inCache = cache.get(cs.getId());
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85 | if (inCache != null) {
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86 | inCache.mergeFrom(cs);
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87 | e.rememberUpdatedChangeset(inCache);
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88 | } else {
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89 | e.rememberAddedChangeset(cs);
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90 | cache.put(cs.getId(), cs);
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91 | }
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92 | }
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93 |
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94 | public void update(Changeset cs) {
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95 | DefaultChangesetCacheEvent e = new DefaultChangesetCacheEvent(this);
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96 | update(cs, e);
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97 | fireChangesetCacheEvent(e);
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98 | }
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99 |
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100 | public void update(Collection<Changeset> changesets) {
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101 | if (changesets == null || changesets.isEmpty()) return;
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102 | DefaultChangesetCacheEvent e = new DefaultChangesetCacheEvent(this);
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103 | for (Changeset cs: changesets) {
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104 | update(cs, e);
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105 | }
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106 | fireChangesetCacheEvent(e);
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107 | }
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108 |
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109 | public boolean contains(int id) {
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110 | if (id <=0) return false;
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111 | return cache.get(id) != null;
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112 | }
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113 |
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114 | public boolean contains(Changeset cs) {
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115 | if (cs == null) return false;
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116 | if (cs.isNew()) return false;
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117 | return contains(cs.getId());
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118 | }
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119 |
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120 | public Changeset get(int id) {
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121 | return cache.get(id);
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122 | }
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123 |
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124 | public Set<Changeset> getChangesets() {
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125 | return new HashSet<Changeset>(cache.values());
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126 | }
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127 |
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128 | protected void remove(int id, DefaultChangesetCacheEvent e) {
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129 | if (id <= 0) return;
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130 | Changeset cs = cache.get(id);
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131 | if (cs == null) return;
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132 | cache.remove(id);
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133 | e.rememberRemovedChangeset(cs);
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134 | }
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135 |
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136 | public void remove(int id) {
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137 | DefaultChangesetCacheEvent e = new DefaultChangesetCacheEvent(this);
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138 | remove(id, e);
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139 | if (! e.isEmpty()) {
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140 | fireChangesetCacheEvent(e);
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141 | }
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142 | }
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143 |
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144 | public void remove(Changeset cs) {
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145 | if (cs == null) return;
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146 | if (cs.isNew()) return;
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147 | remove(cs.getId());
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148 | }
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149 |
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150 | /**
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151 | * Removes the changesets in <code>changesets</code> from the cache. A
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152 | * {@link ChangesetCacheEvent} is fired.
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153 | *
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154 | * @param changesets the changesets to remove. Ignored if null.
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155 | */
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156 | public void remove(Collection<Changeset> changesets) {
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157 | if (changesets == null) return;
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158 | DefaultChangesetCacheEvent evt = new DefaultChangesetCacheEvent(this);
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159 | for (Changeset cs : changesets) {
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160 | if (cs == null || cs.isNew()) {
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161 | continue;
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162 | }
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163 | remove(cs.getId(), evt);
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164 | }
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165 | if (! evt.isEmpty()) {
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166 | fireChangesetCacheEvent(evt);
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167 | }
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168 | }
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169 |
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170 | public int size() {
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171 | return cache.size();
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172 | }
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173 |
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174 | public void clear() {
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175 | DefaultChangesetCacheEvent e = new DefaultChangesetCacheEvent(this);
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176 | for (Changeset cs: cache.values()) {
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177 | e.rememberRemovedChangeset(cs);
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178 | }
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179 | cache.clear();
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180 | fireChangesetCacheEvent(e);
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181 | }
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182 |
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183 | public List<Changeset> getOpenChangesets() {
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184 | List<Changeset> ret = new ArrayList<Changeset>();
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185 | for (Changeset cs: cache.values()) {
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186 | if (cs.isOpen()) {
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187 | ret.add(cs);
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188 | }
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189 | }
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190 | return ret;
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191 | }
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192 |
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193 | /* ------------------------------------------------------------------------- */
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194 | /* interface PreferenceChangedListener */
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195 | /* ------------------------------------------------------------------------- */
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196 | public void preferenceChanged(PreferenceChangeEvent e) {
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197 | if (e.getKey() == null || ! e.getKey().equals("osm-server.url"))
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198 | return;
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199 |
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200 | // clear the cache when the API url changes
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201 | if (e.getOldValue() == null || e.getNewValue() == null || !e.getOldValue().equals(e.getNewValue())) {
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202 | clear();
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203 | }
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204 | }
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205 | }
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