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 | import java.util.stream.Collectors;
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13 |
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14 | import org.openstreetmap.josm.spi.preferences.PreferenceChangeEvent;
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15 | import org.openstreetmap.josm.spi.preferences.PreferenceChangedListener;
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16 | import org.openstreetmap.josm.data.UserIdentityManager;
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17 | import org.openstreetmap.josm.spi.preferences.Config;
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18 | import org.openstreetmap.josm.tools.SubclassFilteredCollection;
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19 |
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20 | /**
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21 | * ChangesetCache is global in-memory cache for changesets downloaded from
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22 | * an OSM API server. The unique instance is available as singleton, see
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23 | * {@link #getInstance()}.
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24 | *
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25 | * Clients interested in cache updates can register for {@link ChangesetCacheEvent}s
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26 | * using {@link #addChangesetCacheListener(ChangesetCacheListener)}. They can use
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27 | * {@link #removeChangesetCacheListener(ChangesetCacheListener)} to unregister as
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28 | * cache event listener.
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29 | *
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30 | * The cache itself listens to {@link java.util.prefs.PreferenceChangeEvent}s. It
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31 | * clears itself if the OSM API URL is changed in the preferences.
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32 | *
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33 | */
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34 | public final class ChangesetCache implements PreferenceChangedListener {
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35 | /** the unique instance */
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36 | private static final ChangesetCache INSTANCE = new ChangesetCache();
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37 |
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38 | /** the cached changesets */
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39 | private final Map<Integer, Changeset> cache = new HashMap<>();
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40 |
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41 | final CopyOnWriteArrayList<ChangesetCacheListener> listeners = new CopyOnWriteArrayList<>();
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42 |
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43 | /**
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44 | * Constructs a new {@code ChangesetCache}.
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45 | */
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46 | private ChangesetCache() {
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47 | Config.getPref().addPreferenceChangeListener(this);
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48 | }
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49 |
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50 | /**
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51 | * Replies the unique instance of the cache
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52 | * @return the unique instance of the cache
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53 | */
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54 | public static ChangesetCache getInstance() {
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55 | return INSTANCE;
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56 | }
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57 |
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58 | /**
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59 | * Add a changeset cache listener.
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60 | * @param listener changeset cache listener to add
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61 | */
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62 | public void addChangesetCacheListener(ChangesetCacheListener listener) {
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63 | if (listener != null) {
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64 | listeners.addIfAbsent(listener);
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65 | }
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66 | }
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67 |
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68 | /**
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69 | * Remove a changeset cache listener.
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70 | * @param listener changeset cache listener to remove
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71 | */
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72 | public void removeChangesetCacheListener(ChangesetCacheListener listener) {
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73 | if (listener != null) {
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74 | listeners.remove(listener);
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75 | }
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76 | }
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77 |
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78 | private void fireChangesetCacheEvent(final ChangesetCacheEvent e) {
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79 | for (ChangesetCacheListener l: listeners) {
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80 | l.changesetCacheUpdated(e);
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81 | }
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82 | }
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83 |
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84 | private void update(Changeset cs, DefaultChangesetCacheEvent e) {
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85 | if (cs == null) return;
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86 | if (cs.isNew()) return;
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87 | Changeset inCache = cache.get(cs.getId());
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88 | if (inCache != null) {
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89 | inCache.mergeFrom(cs);
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90 | e.rememberUpdatedChangeset(inCache);
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91 | } else {
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92 | e.rememberAddedChangeset(cs);
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93 | cache.put(cs.getId(), cs);
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94 | }
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95 | }
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96 |
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97 | /**
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98 | * Update a single changeset.
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99 | * @param cs changeset to update
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100 | */
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101 | public void update(Changeset cs) {
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102 | DefaultChangesetCacheEvent e = new DefaultChangesetCacheEvent(this);
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103 | update(cs, e);
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104 | fireChangesetCacheEvent(e);
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105 | }
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106 |
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107 | /**
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108 | * Update a collection of changesets.
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109 | * @param changesets changesets to update
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110 | */
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111 | public void update(Collection<Changeset> changesets) {
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112 | if (changesets == null || changesets.isEmpty()) return;
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113 | DefaultChangesetCacheEvent e = new DefaultChangesetCacheEvent(this);
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114 | for (Changeset cs: changesets) {
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115 | update(cs, e);
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116 | }
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117 | fireChangesetCacheEvent(e);
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118 | }
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119 |
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120 | /**
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121 | * Determines if the cache contains an entry for given changeset identifier.
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122 | * @param id changeset id
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123 | * @return {@code true} if the cache contains an entry for {@code id}
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124 | */
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125 | public boolean contains(int id) {
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126 | if (id <= 0) return false;
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127 | return cache.get(id) != null;
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128 | }
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129 |
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130 | /**
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131 | * Determines if the cache contains an entry for given changeset.
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132 | * @param cs changeset
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133 | * @return {@code true} if the cache contains an entry for {@code cs}
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134 | */
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135 | public boolean contains(Changeset cs) {
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136 | if (cs == null) return false;
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137 | if (cs.isNew()) return false;
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138 | return contains(cs.getId());
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139 | }
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140 |
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141 | /**
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142 | * Returns the entry for given changeset identifier.
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143 | * @param id changeset id
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144 | * @return the entry for given changeset identifier, or null
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145 | */
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146 | public Changeset get(int id) {
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147 | return cache.get(id);
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148 | }
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149 |
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150 | /**
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151 | * Returns the list of changesets contained in the cache.
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152 | * @return the list of changesets contained in the cache
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153 | */
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154 | public Set<Changeset> getChangesets() {
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155 | return new HashSet<>(cache.values());
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156 | }
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157 |
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158 | private void remove(int id, DefaultChangesetCacheEvent e) {
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159 | if (id <= 0) return;
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160 | Changeset cs = cache.get(id);
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161 | if (cs == null) return;
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162 | cache.remove(id);
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163 | e.rememberRemovedChangeset(cs);
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164 | }
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165 |
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166 | /**
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167 | * Remove the entry for the given changeset identifier.
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168 | * A {@link ChangesetCacheEvent} is fired.
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169 | * @param id changeset id
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170 | */
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171 | public void remove(int id) {
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172 | DefaultChangesetCacheEvent e = new DefaultChangesetCacheEvent(this);
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173 | remove(id, e);
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174 | if (!e.isEmpty()) {
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175 | fireChangesetCacheEvent(e);
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176 | }
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177 | }
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178 |
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179 | /**
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180 | * Remove the entry for the given changeset.
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181 | * A {@link ChangesetCacheEvent} is fired.
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182 | * @param cs changeset
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183 | */
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184 | public void remove(Changeset cs) {
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185 | if (cs == null) return;
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186 | if (cs.isNew()) return;
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187 | remove(cs.getId());
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188 | }
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189 |
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190 | /**
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191 | * Removes the changesets in <code>changesets</code> from the cache.
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192 | * A {@link ChangesetCacheEvent} is fired.
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193 | *
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194 | * @param changesets the changesets to remove. Ignored if null.
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195 | */
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196 | public void remove(Collection<Changeset> changesets) {
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197 | if (changesets == null) return;
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198 | DefaultChangesetCacheEvent evt = new DefaultChangesetCacheEvent(this);
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199 | for (Changeset cs : changesets) {
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200 | if (cs == null || cs.isNew()) {
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201 | continue;
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202 | }
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203 | remove(cs.getId(), evt);
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204 | }
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205 | if (!evt.isEmpty()) {
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206 | fireChangesetCacheEvent(evt);
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207 | }
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208 | }
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209 |
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210 | /**
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211 | * Returns the number of changesets contained in the cache.
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212 | * @return the number of changesets contained in the cache
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213 | */
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214 | public int size() {
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215 | return cache.size();
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216 | }
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217 |
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218 | /**
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219 | * Clears the cache.
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220 | */
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221 | public void clear() {
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222 | DefaultChangesetCacheEvent e = new DefaultChangesetCacheEvent(this);
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223 | for (Changeset cs: cache.values()) {
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224 | e.rememberRemovedChangeset(cs);
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225 | }
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226 | cache.clear();
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227 | fireChangesetCacheEvent(e);
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228 | }
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229 |
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230 | /**
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231 | * Replies the list of open changesets.
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232 | * @return The list of open changesets
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233 | */
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234 | public List<Changeset> getOpenChangesets() {
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235 | return cache.values().stream()
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236 | .filter(Changeset::isOpen)
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237 | .collect(Collectors.toList());
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238 | }
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239 |
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240 | /**
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241 | * If the current user {@link UserIdentityManager#isAnonymous() is known}, the {@link #getOpenChangesets() open changesets}
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242 | * for the {@link UserIdentityManager#isCurrentUser(User) current user} are returned. Otherwise,
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243 | * the unfiltered {@link #getOpenChangesets() open changesets} are returned.
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244 | *
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245 | * @return a list of changesets
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246 | */
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247 | public List<Changeset> getOpenChangesetsForCurrentUser() {
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248 | if (UserIdentityManager.getInstance().isAnonymous()) {
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249 | return getOpenChangesets();
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250 | } else {
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251 | return new ArrayList<>(SubclassFilteredCollection.filter(getOpenChangesets(),
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252 | object -> UserIdentityManager.getInstance().isCurrentUser(object.getUser())));
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253 | }
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254 | }
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255 |
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256 | /* ------------------------------------------------------------------------- */
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257 | /* interface PreferenceChangedListener */
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258 | /* ------------------------------------------------------------------------- */
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259 | @Override
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260 | public void preferenceChanged(PreferenceChangeEvent e) {
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261 | if (e.getKey() == null || !"osm-server.url".equals(e.getKey()))
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262 | return;
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263 |
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264 | // clear the cache when the API url changes
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265 | if (e.getOldValue() == null || e.getNewValue() == null || !e.getOldValue().equals(e.getNewValue())) {
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266 | clear();
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267 | }
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268 | }
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269 | }
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