1 | // License: GPL. For details, see LICENSE file.
|
---|
2 | package org.openstreetmap.josm.gui.layer;
|
---|
3 |
|
---|
4 | import java.util.ArrayList;
|
---|
5 | import java.util.Collection;
|
---|
6 | import java.util.Collections;
|
---|
7 | import java.util.IdentityHashMap;
|
---|
8 | import java.util.Iterator;
|
---|
9 | import java.util.List;
|
---|
10 | import java.util.Set;
|
---|
11 | import java.util.concurrent.CopyOnWriteArrayList;
|
---|
12 |
|
---|
13 | import org.openstreetmap.josm.Main;
|
---|
14 | import org.openstreetmap.josm.gui.util.GuiHelper;
|
---|
15 | import org.openstreetmap.josm.tools.Utils;
|
---|
16 | import org.openstreetmap.josm.tools.bugreport.BugReport;
|
---|
17 |
|
---|
18 | /**
|
---|
19 | * This class handles the layer management.
|
---|
20 | * <p>
|
---|
21 | * This manager handles a list of layers with the first layer being the front layer.
|
---|
22 | * <h1>Threading</h1>
|
---|
23 | * Methods of this manager may be called from any thread in any order.
|
---|
24 | * Listeners are called while this layer manager is locked, so they should not block.
|
---|
25 | *
|
---|
26 | * @author Michael Zangl
|
---|
27 | * @since 10273
|
---|
28 | */
|
---|
29 | public class LayerManager {
|
---|
30 | /**
|
---|
31 | * Interface to notify listeners of a layer change.
|
---|
32 | */
|
---|
33 | public interface LayerChangeListener {
|
---|
34 | /**
|
---|
35 | * Notifies this listener that a layer has been added.
|
---|
36 | * <p>
|
---|
37 | * Listeners are called in the EDT thread and you can manipulate the layer manager in the current thread.
|
---|
38 | * @param e The new added layer event
|
---|
39 | */
|
---|
40 | void layerAdded(LayerAddEvent e);
|
---|
41 |
|
---|
42 | /**
|
---|
43 | * Notifies this listener that a layer is about to be removed.
|
---|
44 | * <p>
|
---|
45 | * Listeners are called in the EDT thread and you can manipulate the layer manager in the current thread.
|
---|
46 | * @param e The layer to be removed (as event)
|
---|
47 | */
|
---|
48 | void layerRemoving(LayerRemoveEvent e);
|
---|
49 |
|
---|
50 | /**
|
---|
51 | * Notifies this listener that the order of layers was changed.
|
---|
52 | * <p>
|
---|
53 | * Listeners are called in the EDT thread and you can manipulate the layer manager in the current thread.
|
---|
54 | * @param e The order change event.
|
---|
55 | */
|
---|
56 | void layerOrderChanged(LayerOrderChangeEvent e);
|
---|
57 | }
|
---|
58 |
|
---|
59 | protected static class LayerManagerEvent {
|
---|
60 | private final LayerManager source;
|
---|
61 |
|
---|
62 | LayerManagerEvent(LayerManager source) {
|
---|
63 | this.source = source;
|
---|
64 | }
|
---|
65 |
|
---|
66 | public LayerManager getSource() {
|
---|
67 | return source;
|
---|
68 | }
|
---|
69 | }
|
---|
70 |
|
---|
71 | /**
|
---|
72 | * The event that is fired whenever a layer was added.
|
---|
73 | * @author Michael Zangl
|
---|
74 | */
|
---|
75 | public static class LayerAddEvent extends LayerManagerEvent {
|
---|
76 | private final Layer addedLayer;
|
---|
77 |
|
---|
78 | LayerAddEvent(LayerManager source, Layer addedLayer) {
|
---|
79 | super(source);
|
---|
80 | this.addedLayer = addedLayer;
|
---|
81 | }
|
---|
82 |
|
---|
83 | /**
|
---|
84 | * Gets the layer that was added.
|
---|
85 | * @return The added layer.
|
---|
86 | */
|
---|
87 | public Layer getAddedLayer() {
|
---|
88 | return addedLayer;
|
---|
89 | }
|
---|
90 |
|
---|
91 | @Override
|
---|
92 | public String toString() {
|
---|
93 | return "LayerAddEvent [addedLayer=" + addedLayer + ']';
|
---|
94 | }
|
---|
95 | }
|
---|
96 |
|
---|
97 | /**
|
---|
98 | * The event that is fired before removing a layer.
|
---|
99 | * @author Michael Zangl
|
---|
100 | */
|
---|
101 | public static class LayerRemoveEvent extends LayerManagerEvent {
|
---|
102 | private final Layer removedLayer;
|
---|
103 | private final boolean lastLayer;
|
---|
104 | private final Collection<Layer> scheduleForRemoval = new ArrayList<>();
|
---|
105 |
|
---|
106 | LayerRemoveEvent(LayerManager source, Layer removedLayer) {
|
---|
107 | super(source);
|
---|
108 | this.removedLayer = removedLayer;
|
---|
109 | this.lastLayer = source.getLayers().size() == 1;
|
---|
110 | }
|
---|
111 |
|
---|
112 | /**
|
---|
113 | * Gets the layer that is about to be removed.
|
---|
114 | * @return The layer.
|
---|
115 | */
|
---|
116 | public Layer getRemovedLayer() {
|
---|
117 | return removedLayer;
|
---|
118 | }
|
---|
119 |
|
---|
120 | /**
|
---|
121 | * Check if the layer that was removed is the last layer in the list.
|
---|
122 | * @return <code>true</code> if this was the last layer.
|
---|
123 | * @since 10432
|
---|
124 | */
|
---|
125 | public boolean isLastLayer() {
|
---|
126 | return lastLayer;
|
---|
127 | }
|
---|
128 |
|
---|
129 | /**
|
---|
130 | * Schedule the removal of other layers after this layer has been deleted.
|
---|
131 | * <p>
|
---|
132 | * Dupplicate removal requests are ignored.
|
---|
133 | * @param layers The layers to remove.
|
---|
134 | * @since 10507
|
---|
135 | */
|
---|
136 | public void scheduleRemoval(Collection<? extends Layer> layers) {
|
---|
137 | for (Layer layer : layers) {
|
---|
138 | getSource().checkContainsLayer(layer);
|
---|
139 | }
|
---|
140 | scheduleForRemoval.addAll(layers);
|
---|
141 | }
|
---|
142 |
|
---|
143 | @Override
|
---|
144 | public String toString() {
|
---|
145 | return "LayerRemoveEvent [removedLayer=" + removedLayer + ", lastLayer=" + lastLayer + ']';
|
---|
146 | }
|
---|
147 | }
|
---|
148 |
|
---|
149 | /**
|
---|
150 | * An event that is fired whenever the order of layers changed.
|
---|
151 | * <p>
|
---|
152 | * We currently do not report the exact changes.
|
---|
153 | * @author Michael Zangl
|
---|
154 | */
|
---|
155 | public static class LayerOrderChangeEvent extends LayerManagerEvent {
|
---|
156 | LayerOrderChangeEvent(LayerManager source) {
|
---|
157 | super(source);
|
---|
158 | }
|
---|
159 |
|
---|
160 | @Override
|
---|
161 | public String toString() {
|
---|
162 | return "LayerOrderChangeEvent []";
|
---|
163 | }
|
---|
164 | }
|
---|
165 |
|
---|
166 | /**
|
---|
167 | * This is the list of layers we manage.
|
---|
168 | */
|
---|
169 | private final List<Layer> layers = new ArrayList<>();
|
---|
170 |
|
---|
171 | private final List<LayerChangeListener> layerChangeListeners = new CopyOnWriteArrayList<>();
|
---|
172 |
|
---|
173 | /**
|
---|
174 | * Add a layer. The layer will be added at a given psoition.
|
---|
175 | * @param layer The layer to add
|
---|
176 | */
|
---|
177 | public void addLayer(final Layer layer) {
|
---|
178 | // we force this on to the EDT Thread to make events fire from there.
|
---|
179 | // The synchronization lock needs to be held by the EDT.
|
---|
180 | GuiHelper.runInEDTAndWaitWithException(() -> realAddLayer(layer));
|
---|
181 | }
|
---|
182 |
|
---|
183 | protected synchronized void realAddLayer(Layer layer) {
|
---|
184 | if (containsLayer(layer)) {
|
---|
185 | throw new IllegalArgumentException("Cannot add a layer twice.");
|
---|
186 | }
|
---|
187 | LayerPositionStrategy positionStrategy = layer.getDefaultLayerPosition();
|
---|
188 | int position = positionStrategy.getPosition(this);
|
---|
189 | checkPosition(position);
|
---|
190 | insertLayerAt(layer, position);
|
---|
191 | fireLayerAdded(layer);
|
---|
192 | if (Main.map != null) {
|
---|
193 | layer.hookUpMapView(); // needs to be after fireLayerAdded
|
---|
194 | }
|
---|
195 | }
|
---|
196 |
|
---|
197 | /**
|
---|
198 | * Remove the layer from the mapview. If the layer was in the list before,
|
---|
199 | * an LayerChange event is fired.
|
---|
200 | * @param layer The layer to remove
|
---|
201 | */
|
---|
202 | public void removeLayer(final Layer layer) {
|
---|
203 | // we force this on to the EDT Thread to make events fire from there.
|
---|
204 | // The synchronization lock needs to be held by the EDT.
|
---|
205 | GuiHelper.runInEDTAndWaitWithException(() -> realRemoveLayer(layer));
|
---|
206 | }
|
---|
207 |
|
---|
208 | protected synchronized void realRemoveLayer(Layer layer) {
|
---|
209 | GuiHelper.assertCallFromEdt();
|
---|
210 | Set<Layer> toRemove = Collections.newSetFromMap(new IdentityHashMap<Layer, Boolean>());
|
---|
211 | toRemove.add(layer);
|
---|
212 |
|
---|
213 | while (!toRemove.isEmpty()) {
|
---|
214 | Iterator<Layer> iterator = toRemove.iterator();
|
---|
215 | Layer layerToRemove = iterator.next();
|
---|
216 | iterator.remove();
|
---|
217 | checkContainsLayer(layerToRemove);
|
---|
218 |
|
---|
219 | Collection<Layer> newToRemove = realRemoveSingleLayer(layerToRemove);
|
---|
220 | toRemove.addAll(newToRemove);
|
---|
221 | }
|
---|
222 | }
|
---|
223 |
|
---|
224 | protected Collection<Layer> realRemoveSingleLayer(Layer layerToRemove) {
|
---|
225 | Collection<Layer> newToRemove = fireLayerRemoving(layerToRemove);
|
---|
226 | layers.remove(layerToRemove);
|
---|
227 | return newToRemove;
|
---|
228 | }
|
---|
229 |
|
---|
230 | /**
|
---|
231 | * Move a layer to a new position.
|
---|
232 | * @param layer The layer to move.
|
---|
233 | * @param position The position.
|
---|
234 | * @throws IndexOutOfBoundsException if the position is out of bounds.
|
---|
235 | */
|
---|
236 | public void moveLayer(final Layer layer, final int position) {
|
---|
237 | // we force this on to the EDT Thread to make events fire from there.
|
---|
238 | // The synchronization lock needs to be held by the EDT.
|
---|
239 | GuiHelper.runInEDTAndWaitWithException(() -> realMoveLayer(layer, position));
|
---|
240 | }
|
---|
241 |
|
---|
242 | protected synchronized void realMoveLayer(Layer layer, int position) {
|
---|
243 | checkContainsLayer(layer);
|
---|
244 | checkPosition(position);
|
---|
245 |
|
---|
246 | int curLayerPos = layers.indexOf(layer);
|
---|
247 | if (position == curLayerPos)
|
---|
248 | return; // already in place.
|
---|
249 | layers.remove(curLayerPos);
|
---|
250 | insertLayerAt(layer, position);
|
---|
251 | fireLayerOrderChanged();
|
---|
252 | }
|
---|
253 |
|
---|
254 | /**
|
---|
255 | * Insert a layer at a given position.
|
---|
256 | * @param layer The layer to add.
|
---|
257 | * @param position The position on which we should add it.
|
---|
258 | */
|
---|
259 | private void insertLayerAt(Layer layer, int position) {
|
---|
260 | if (position == layers.size()) {
|
---|
261 | layers.add(layer);
|
---|
262 | } else {
|
---|
263 | layers.add(position, layer);
|
---|
264 | }
|
---|
265 | }
|
---|
266 |
|
---|
267 | /**
|
---|
268 | * Check if the (new) position is valid
|
---|
269 | * @param position The position index
|
---|
270 | * @throws IndexOutOfBoundsException if it is not.
|
---|
271 | */
|
---|
272 | private void checkPosition(int position) {
|
---|
273 | if (position < 0 || position > layers.size()) {
|
---|
274 | throw new IndexOutOfBoundsException("Position " + position + " out of range.");
|
---|
275 | }
|
---|
276 | }
|
---|
277 |
|
---|
278 | /**
|
---|
279 | * Gets an unmodifiable list of all layers that are currently in this manager. This list won't update once layers are added or removed.
|
---|
280 | * @return The list of layers.
|
---|
281 | */
|
---|
282 | public List<Layer> getLayers() {
|
---|
283 | return Collections.unmodifiableList(new ArrayList<>(layers));
|
---|
284 | }
|
---|
285 |
|
---|
286 | /**
|
---|
287 | * Replies an unmodifiable list of layers of a certain type.
|
---|
288 | *
|
---|
289 | * Example:
|
---|
290 | * <pre>
|
---|
291 | * List<WMSLayer> wmsLayers = getLayersOfType(WMSLayer.class);
|
---|
292 | * </pre>
|
---|
293 | * @param <T> The layer type
|
---|
294 | * @param ofType The layer type.
|
---|
295 | * @return an unmodifiable list of layers of a certain type.
|
---|
296 | */
|
---|
297 | public <T extends Layer> List<T> getLayersOfType(Class<T> ofType) {
|
---|
298 | return new ArrayList<>(Utils.filteredCollection(getLayers(), ofType));
|
---|
299 | }
|
---|
300 |
|
---|
301 | /**
|
---|
302 | * replies true if the list of layers managed by this map view contain layer
|
---|
303 | *
|
---|
304 | * @param layer the layer
|
---|
305 | * @return true if the list of layers managed by this map view contain layer
|
---|
306 | */
|
---|
307 | public synchronized boolean containsLayer(Layer layer) {
|
---|
308 | return layers.contains(layer);
|
---|
309 | }
|
---|
310 |
|
---|
311 | protected void checkContainsLayer(Layer layer) {
|
---|
312 | if (!containsLayer(layer)) {
|
---|
313 | throw new IllegalArgumentException(layer + " is not managed by us.");
|
---|
314 | }
|
---|
315 | }
|
---|
316 |
|
---|
317 | /**
|
---|
318 | * Adds a layer change listener
|
---|
319 | *
|
---|
320 | * @param listener the listener.
|
---|
321 | * @throws IllegalArgumentException If the listener was added twice.
|
---|
322 | */
|
---|
323 | public synchronized void addLayerChangeListener(LayerChangeListener listener) {
|
---|
324 | addLayerChangeListener(listener, false);
|
---|
325 | }
|
---|
326 |
|
---|
327 | /**
|
---|
328 | * Adds a layer change listener
|
---|
329 | *
|
---|
330 | * @param listener the listener.
|
---|
331 | * @param fireAdd if we should fire an add event for every layer in this manager.
|
---|
332 | * @throws IllegalArgumentException If the listener was added twice.
|
---|
333 | */
|
---|
334 | public synchronized void addLayerChangeListener(LayerChangeListener listener, boolean fireAdd) {
|
---|
335 | if (layerChangeListeners.contains(listener)) {
|
---|
336 | throw new IllegalArgumentException("Listener already registered.");
|
---|
337 | }
|
---|
338 | layerChangeListeners.add(listener);
|
---|
339 | if (fireAdd) {
|
---|
340 | for (Layer l : getLayers()) {
|
---|
341 | listener.layerAdded(new LayerAddEvent(this, l));
|
---|
342 | }
|
---|
343 | }
|
---|
344 | }
|
---|
345 |
|
---|
346 | /**
|
---|
347 | * Removes a layer change listener
|
---|
348 | *
|
---|
349 | * @param listener the listener. Ignored if null or already registered.
|
---|
350 | */
|
---|
351 | public synchronized void removeLayerChangeListener(LayerChangeListener listener) {
|
---|
352 | removeLayerChangeListener(listener, false);
|
---|
353 | }
|
---|
354 |
|
---|
355 | /**
|
---|
356 | * Removes a layer change listener
|
---|
357 | *
|
---|
358 | * @param listener the listener.
|
---|
359 | * @param fireRemove if we should fire a remove event for every layer in this manager. The event is fired as if the layer was deleted but
|
---|
360 | * {@link LayerRemoveEvent#scheduleRemoval(Collection)} is ignored.
|
---|
361 | */
|
---|
362 | public synchronized void removeLayerChangeListener(LayerChangeListener listener, boolean fireRemove) {
|
---|
363 | if (!layerChangeListeners.remove(listener)) {
|
---|
364 | throw new IllegalArgumentException("Listener was not registered before: " + listener);
|
---|
365 | } else {
|
---|
366 | if (fireRemove) {
|
---|
367 | for (Layer l : getLayers()) {
|
---|
368 | listener.layerRemoving(new LayerRemoveEvent(this, l));
|
---|
369 | }
|
---|
370 | }
|
---|
371 | }
|
---|
372 | }
|
---|
373 |
|
---|
374 | private void fireLayerAdded(Layer layer) {
|
---|
375 | GuiHelper.assertCallFromEdt();
|
---|
376 | LayerAddEvent e = new LayerAddEvent(this, layer);
|
---|
377 | for (LayerChangeListener l : layerChangeListeners) {
|
---|
378 | try {
|
---|
379 | l.layerAdded(e);
|
---|
380 | } catch (RuntimeException t) {
|
---|
381 | throw BugReport.intercept(t).put("listener", l).put("event", e);
|
---|
382 | }
|
---|
383 | }
|
---|
384 | }
|
---|
385 |
|
---|
386 | /**
|
---|
387 | * Fire the layer remove event
|
---|
388 | * @param layer The layer to remove
|
---|
389 | * @return A list of layers that should be removed afterwards.
|
---|
390 | */
|
---|
391 | private Collection<Layer> fireLayerRemoving(Layer layer) {
|
---|
392 | GuiHelper.assertCallFromEdt();
|
---|
393 | LayerRemoveEvent e = new LayerRemoveEvent(this, layer);
|
---|
394 | for (LayerChangeListener l : layerChangeListeners) {
|
---|
395 | try {
|
---|
396 | l.layerRemoving(e);
|
---|
397 | } catch (RuntimeException t) {
|
---|
398 | throw BugReport.intercept(t).put("listener", l).put("event", e).put("layer", layer);
|
---|
399 | }
|
---|
400 | }
|
---|
401 | return e.scheduleForRemoval;
|
---|
402 | }
|
---|
403 |
|
---|
404 | private void fireLayerOrderChanged() {
|
---|
405 | GuiHelper.assertCallFromEdt();
|
---|
406 | LayerOrderChangeEvent e = new LayerOrderChangeEvent(this);
|
---|
407 | for (LayerChangeListener l : layerChangeListeners) {
|
---|
408 | try {
|
---|
409 | l.layerOrderChanged(e);
|
---|
410 | } catch (RuntimeException t) {
|
---|
411 | throw BugReport.intercept(t).put("listener", l).put("event", e);
|
---|
412 | }
|
---|
413 | }
|
---|
414 | }
|
---|
415 |
|
---|
416 | /**
|
---|
417 | * Reset all layer manager state. This includes removing all layers and then unregistering all listeners
|
---|
418 | * @since 10432
|
---|
419 | */
|
---|
420 | public void resetState() {
|
---|
421 | // some layer remove listeners remove other layers.
|
---|
422 | while (!getLayers().isEmpty()) {
|
---|
423 | removeLayer(getLayers().get(0));
|
---|
424 | }
|
---|
425 |
|
---|
426 | layerChangeListeners.clear();
|
---|
427 | }
|
---|
428 | }
|
---|