source: josm/trunk/src/org/openstreetmap/josm/data/osm/visitor/paint/relations/MultipolygonCache.java@ 7395

Last change on this file since 7395 was 7395, checked in by Don-vip, 10 years ago

javadoc update/cleanup
File size: 12.7 KB
Line 
1// License: GPL. For details, see LICENSE file.
2package org.openstreetmap.josm.data.osm.visitor.paint.relations;
3
4import java.util.ArrayList;
5import java.util.Collection;
6import java.util.HashMap;
7import java.util.Iterator;
8import java.util.List;
9import java.util.Map;
10
11import org.openstreetmap.josm.Main;
12import org.openstreetmap.josm.data.SelectionChangedListener;
13import org.openstreetmap.josm.data.osm.DataSet;
14import org.openstreetmap.josm.data.osm.Node;
15import org.openstreetmap.josm.data.osm.OsmPrimitive;
16import org.openstreetmap.josm.data.osm.Relation;
17import org.openstreetmap.josm.data.osm.Way;
18import org.openstreetmap.josm.data.osm.event.AbstractDatasetChangedEvent;
19import org.openstreetmap.josm.data.osm.event.DataChangedEvent;
20import org.openstreetmap.josm.data.osm.event.DataSetListener;
21import org.openstreetmap.josm.data.osm.event.NodeMovedEvent;
22import org.openstreetmap.josm.data.osm.event.PrimitivesAddedEvent;
23import org.openstreetmap.josm.data.osm.event.PrimitivesRemovedEvent;
24import org.openstreetmap.josm.data.osm.event.RelationMembersChangedEvent;
25import org.openstreetmap.josm.data.osm.event.TagsChangedEvent;
26import org.openstreetmap.josm.data.osm.event.WayNodesChangedEvent;
27import org.openstreetmap.josm.data.osm.visitor.paint.relations.Multipolygon.PolyData;
28import org.openstreetmap.josm.data.projection.Projection;
29import org.openstreetmap.josm.data.projection.ProjectionChangeListener;
30import org.openstreetmap.josm.gui.MapView;
31import org.openstreetmap.josm.gui.MapView.LayerChangeListener;
32import org.openstreetmap.josm.gui.NavigatableComponent;
33import org.openstreetmap.josm.gui.layer.Layer;
34import org.openstreetmap.josm.gui.layer.OsmDataLayer;
35
36/**
37 * A memory cache for {@link Multipolygon} objects.
38 * @since 4623
39 */
40public final class MultipolygonCache implements DataSetListener, LayerChangeListener, ProjectionChangeListener, SelectionChangedListener {
41
42 private static final MultipolygonCache INSTANCE = new MultipolygonCache();
43
44 private final Map<NavigatableComponent, Map<DataSet, Map<Relation, Multipolygon>>> cache;
45
46 private final Collection<PolyData> selectedPolyData;
47
48 private MultipolygonCache() {
49 this.cache = new HashMap<>();
50 this.selectedPolyData = new ArrayList<>();
51 Main.addProjectionChangeListener(this);
52 DataSet.addSelectionListener(this);
53 MapView.addLayerChangeListener(this);
54 }
55
56 /**
57 * Replies the unique instance.
58 * @return the unique instance
59 */
60 public static final MultipolygonCache getInstance() {
61 return INSTANCE;
62 }
63
64 /**
65 * Gets a multipolygon from cache.
66 * @param nc The navigatable component
67 * @param r The multipolygon relation
68 * @return A multipolygon object for the given relation, or {@code null}
69 */
70 public final Multipolygon get(NavigatableComponent nc, Relation r) {
71 return get(nc, r, false);
72 }
73
74 /**
75 * Gets a multipolygon from cache.
76 * @param nc The navigatable component
77 * @param r The multipolygon relation
78 * @param forceRefresh if {@code true}, a new object will be created even of present in cache
79 * @return A multipolygon object for the given relation, or {@code null}
80 */
81 public final Multipolygon get(NavigatableComponent nc, Relation r, boolean forceRefresh) {
82 Multipolygon multipolygon = null;
83 if (nc != null && r != null) {
84 Map<DataSet, Map<Relation, Multipolygon>> map1 = cache.get(nc);
85 if (map1 == null) {
86 cache.put(nc, map1 = new HashMap<>());
87 }
88 Map<Relation, Multipolygon> map2 = map1.get(r.getDataSet());
89 if (map2 == null) {
90 map1.put(r.getDataSet(), map2 = new HashMap<>());
91 }
92 multipolygon = map2.get(r);
93 if (multipolygon == null || forceRefresh) {
94 map2.put(r, multipolygon = new Multipolygon(r));
95 for (PolyData pd : multipolygon.getCombinedPolygons()) {
96 if (pd.selected) {
97 selectedPolyData.add(pd);
98 }
99 }
100 }
101 }
102 return multipolygon;
103 }
104
105 /**
106 * Clears the cache for the given navigatable component.
107 * @param nc the navigatable component
108 */
109 public final void clear(NavigatableComponent nc) {
110 Map<DataSet, Map<Relation, Multipolygon>> map = cache.remove(nc);
111 if (map != null) {
112 map.clear();
113 map = null;
114 }
115 }
116
117 /**
118 * Clears the cache for the given dataset.
119 * @param ds the data set
120 */
121 public final void clear(DataSet ds) {
122 for (Map<DataSet, Map<Relation, Multipolygon>> map1 : cache.values()) {
123 Map<Relation, Multipolygon> map2 = map1.remove(ds);
124 if (map2 != null) {
125 map2.clear();
126 map2 = null;
127 }
128 }
129 }
130
131 /**
132 * Clears the whole cache.
133 */
134 public final void clear() {
135 cache.clear();
136 }
137
138 private final Collection<Map<Relation, Multipolygon>> getMapsFor(DataSet ds) {
139 List<Map<Relation, Multipolygon>> result = new ArrayList<>();
140 for (Map<DataSet, Map<Relation, Multipolygon>> map : cache.values()) {
141 Map<Relation, Multipolygon> map2 = map.get(ds);
142 if (map2 != null) {
143 result.add(map2);
144 }
145 }
146 return result;
147 }
148
149 private static final boolean isMultipolygon(OsmPrimitive p) {
150 return p instanceof Relation && ((Relation) p).isMultipolygon();
151 }
152
153 private final void updateMultipolygonsReferringTo(AbstractDatasetChangedEvent event) {
154 updateMultipolygonsReferringTo(event, event.getPrimitives(), event.getDataset());
155 }
156
157 private final void updateMultipolygonsReferringTo(
158 final AbstractDatasetChangedEvent event, Collection<? extends OsmPrimitive> primitives, DataSet ds) {
159 updateMultipolygonsReferringTo(event, primitives, ds, null);
160 }
161
162 private final Collection<Map<Relation, Multipolygon>> updateMultipolygonsReferringTo(
163 AbstractDatasetChangedEvent event, Collection<? extends OsmPrimitive> primitives,
164 DataSet ds, Collection<Map<Relation, Multipolygon>> initialMaps) {
165 Collection<Map<Relation, Multipolygon>> maps = initialMaps;
166 if (primitives != null) {
167 for (OsmPrimitive p : primitives) {
168 if (isMultipolygon(p)) {
169 if (maps == null) {
170 maps = getMapsFor(ds);
171 }
172 processEvent(event, (Relation) p, maps);
173
174 } else if (p instanceof Way && p.getDataSet() != null) {
175 for (OsmPrimitive ref : p.getReferrers()) {
176 if (isMultipolygon(ref)) {
177 if (maps == null) {
178 maps = getMapsFor(ds);
179 }
180 processEvent(event, (Relation) ref, maps);
181 }
182 }
183 } else if (p instanceof Node && p.getDataSet() != null) {
184 maps = updateMultipolygonsReferringTo(event, p.getReferrers(), ds, maps);
185 }
186 }
187 }
188 return maps;
189 }
190
191 private final void processEvent(AbstractDatasetChangedEvent event, Relation r, Collection<Map<Relation, Multipolygon>> maps) {
192 if (event instanceof NodeMovedEvent || event instanceof WayNodesChangedEvent) {
193 dispatchEvent(event, r, maps);
194 } else if (event instanceof PrimitivesRemovedEvent) {
195 if (event.getPrimitives().contains(r)) {
196 removeMultipolygonFrom(r, maps);
197 }
198 } else {
199 // Default (non-optimal) action: remove multipolygon from cache
200 removeMultipolygonFrom(r, maps);
201 }
202 }
203
204 private final void dispatchEvent(AbstractDatasetChangedEvent event, Relation r, Collection<Map<Relation, Multipolygon>> maps) {
205 for (Map<Relation, Multipolygon> map : maps) {
206 Multipolygon m = map.get(r);
207 if (m != null) {
208 for (PolyData pd : m.getCombinedPolygons()) {
209 if (event instanceof NodeMovedEvent) {
210 pd.nodeMoved((NodeMovedEvent) event);
211 } else if (event instanceof WayNodesChangedEvent) {
212 pd.wayNodesChanged((WayNodesChangedEvent)event);
213 }
214 }
215 }
216 }
217 }
218
219 private final void removeMultipolygonFrom(Relation r, Collection<Map<Relation, Multipolygon>> maps) {
220 for (Map<Relation, Multipolygon> map : maps) {
221 map.remove(r);
222 }
223 }
224
225 @Override
226 public void primitivesAdded(PrimitivesAddedEvent event) {
227 // Do nothing
228 }
229
230 @Override
231 public void primitivesRemoved(PrimitivesRemovedEvent event) {
232 updateMultipolygonsReferringTo(event);
233 }
234
235 @Override
236 public void tagsChanged(TagsChangedEvent event) {
237 // Do nothing
238 }
239
240 @Override
241 public void nodeMoved(NodeMovedEvent event) {
242 updateMultipolygonsReferringTo(event);
243 }
244
245 @Override
246 public void wayNodesChanged(WayNodesChangedEvent event) {
247 updateMultipolygonsReferringTo(event);
248 }
249
250 @Override
251 public void relationMembersChanged(RelationMembersChangedEvent event) {
252 updateMultipolygonsReferringTo(event);
253 }
254
255 @Override
256 public void otherDatasetChange(AbstractDatasetChangedEvent event) {
257 // Do nothing
258 }
259
260 @Override
261 public void dataChanged(DataChangedEvent event) {
262 // Do not call updateMultipolygonsReferringTo as getPrimitives()
263 // can return all the data set primitives for this event
264 Collection<Map<Relation, Multipolygon>> maps = null;
265 for (OsmPrimitive p : event.getPrimitives()) {
266 if (isMultipolygon(p)) {
267 if (maps == null) {
268 maps = getMapsFor(event.getDataset());
269 }
270 for (Map<Relation, Multipolygon> map : maps) {
271 // DataChangedEvent is sent after downloading incomplete members (see #7131),
272 // without having received RelationMembersChangedEvent or PrimitivesAddedEvent
273 // OR when undoing a move of a large number of nodes (see #7195),
274 // without having received NodeMovedEvent
275 // This ensures concerned multipolygons will be correctly redrawn
276 map.remove(p);
277 }
278 }
279 }
280 }
281
282 @Override
283 public void activeLayerChange(Layer oldLayer, Layer newLayer) {
284 // Do nothing
285 }
286
287 @Override
288 public void layerAdded(Layer newLayer) {
289 // Do nothing
290 }
291
292 @Override
293 public void layerRemoved(Layer oldLayer) {
294 if (oldLayer instanceof OsmDataLayer) {
295 clear(((OsmDataLayer) oldLayer).data);
296 }
297 }
298
299 @Override
300 public void projectionChanged(Projection oldValue, Projection newValue) {
301 clear();
302 }
303
304 @Override
305 public void selectionChanged(Collection<? extends OsmPrimitive> newSelection) {
306
307 for (Iterator<PolyData> it = selectedPolyData.iterator(); it.hasNext();) {
308 it.next().selected = false;
309 it.remove();
310 }
311
312 DataSet ds = null;
313 Collection<Map<Relation, Multipolygon>> maps = null;
314 for (OsmPrimitive p : newSelection) {
315 if (p instanceof Way && p.getDataSet() != null) {
316 if (ds == null) {
317 ds = p.getDataSet();
318 }
319 for (OsmPrimitive ref : p.getReferrers()) {
320 if (isMultipolygon(ref)) {
321 if (maps == null) {
322 maps = getMapsFor(ds);
323 }
324 for (Map<Relation, Multipolygon> map : maps) {
325 Multipolygon multipolygon = map.get(ref);
326 if (multipolygon != null) {
327 for (PolyData pd : multipolygon.getCombinedPolygons()) {
328 if (pd.getWayIds().contains(p.getUniqueId())) {
329 pd.selected = true;
330 selectedPolyData.add(pd);
331 }
332 }
333 }
334 }
335 }
336 }
337 }
338 }
339 }
340}
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