source: josm/trunk/src/org/openstreetmap/josm/actions/mapmode/SelectAction.java@ 11553

Last change on this file since 11553 was 11553, checked in by Don-vip, 7 years ago

refactor handling of null values - use Java 8 Optional where possible
  • Property svn:eol-style set to native
File size: 50.3 KB
Line 
1// License: GPL. For details, see LICENSE file.
2package org.openstreetmap.josm.actions.mapmode;
3
4import static org.openstreetmap.josm.gui.help.HelpUtil.ht;
5import static org.openstreetmap.josm.tools.I18n.tr;
6import static org.openstreetmap.josm.tools.I18n.trn;
7
8import java.awt.Cursor;
9import java.awt.Point;
10import java.awt.Rectangle;
11import java.awt.event.KeyEvent;
12import java.awt.event.MouseEvent;
13import java.awt.geom.Point2D;
14import java.util.Collection;
15import java.util.Collections;
16import java.util.HashSet;
17import java.util.Iterator;
18import java.util.LinkedList;
19import java.util.Set;
20
21import javax.swing.JOptionPane;
22
23import org.openstreetmap.josm.Main;
24import org.openstreetmap.josm.actions.MergeNodesAction;
25import org.openstreetmap.josm.command.AddCommand;
26import org.openstreetmap.josm.command.ChangeCommand;
27import org.openstreetmap.josm.command.Command;
28import org.openstreetmap.josm.command.MoveCommand;
29import org.openstreetmap.josm.command.RotateCommand;
30import org.openstreetmap.josm.command.ScaleCommand;
31import org.openstreetmap.josm.command.SequenceCommand;
32import org.openstreetmap.josm.data.coor.EastNorth;
33import org.openstreetmap.josm.data.coor.LatLon;
34import org.openstreetmap.josm.data.osm.DataSet;
35import org.openstreetmap.josm.data.osm.Node;
36import org.openstreetmap.josm.data.osm.OsmPrimitive;
37import org.openstreetmap.josm.data.osm.Way;
38import org.openstreetmap.josm.data.osm.WaySegment;
39import org.openstreetmap.josm.data.osm.visitor.AllNodesVisitor;
40import org.openstreetmap.josm.data.osm.visitor.paint.WireframeMapRenderer;
41import org.openstreetmap.josm.gui.ExtendedDialog;
42import org.openstreetmap.josm.gui.MapFrame;
43import org.openstreetmap.josm.gui.MapView;
44import org.openstreetmap.josm.gui.MapViewState.MapViewPoint;
45import org.openstreetmap.josm.gui.SelectionManager;
46import org.openstreetmap.josm.gui.SelectionManager.SelectionEnded;
47import org.openstreetmap.josm.gui.layer.Layer;
48import org.openstreetmap.josm.gui.layer.OsmDataLayer;
49import org.openstreetmap.josm.gui.util.GuiHelper;
50import org.openstreetmap.josm.gui.util.KeyPressReleaseListener;
51import org.openstreetmap.josm.gui.util.ModifierListener;
52import org.openstreetmap.josm.tools.ImageProvider;
53import org.openstreetmap.josm.tools.Pair;
54import org.openstreetmap.josm.tools.Shortcut;
55import org.openstreetmap.josm.tools.Utils;
56
57/**
58 * Move is an action that can move all kind of OsmPrimitives (except keys for now).
59 *
60 * If an selected object is under the mouse when dragging, move all selected objects.
61 * If an unselected object is under the mouse when dragging, it becomes selected
62 * and will be moved.
63 * If no object is under the mouse, move all selected objects (if any)
64 *
65 * On Mac OS X, Ctrl + mouse button 1 simulates right click (map move), so the
66 * feature "selection remove" is disabled on this platform.
67 */
68public class SelectAction extends MapMode implements ModifierListener, KeyPressReleaseListener, SelectionEnded {
69
70 /**
71 * Select action mode.
72 * @since 7543
73 */
74 public enum Mode {
75 /** "MOVE" means either dragging or select if no mouse movement occurs (i.e. just clicking) */
76 MOVE,
77 /** "ROTATE" allows to apply a rotation transformation on the selected object (see {@link RotateCommand}) */
78 ROTATE,
79 /** "SCALE" allows to apply a scaling transformation on the selected object (see {@link ScaleCommand}) */
80 SCALE,
81 /** "SELECT" means the selection rectangle */
82 SELECT
83 }
84
85 // contains all possible cases the cursor can be in the SelectAction
86 private enum SelectActionCursor {
87 rect("normal", /* ICON(cursor/modifier/) */ "selection"),
88 rect_add("normal", /* ICON(cursor/modifier/) */ "select_add"),
89 rect_rm("normal", /* ICON(cursor/modifier/) */ "select_remove"),
90 way("normal", /* ICON(cursor/modifier/) */ "select_way"),
91 way_add("normal", /* ICON(cursor/modifier/) */ "select_way_add"),
92 way_rm("normal", /* ICON(cursor/modifier/) */ "select_way_remove"),
93 node("normal", /* ICON(cursor/modifier/) */ "select_node"),
94 node_add("normal", /* ICON(cursor/modifier/) */ "select_node_add"),
95 node_rm("normal", /* ICON(cursor/modifier/) */ "select_node_remove"),
96 virtual_node("normal", /* ICON(cursor/modifier/) */ "addnode"),
97 scale(/* ICON(cursor/) */ "scale", null),
98 rotate(/* ICON(cursor/) */ "rotate", null),
99 merge(/* ICON(cursor/) */ "crosshair", null),
100 lasso("normal", /* ICON(cursor/modifier/) */ "rope"),
101 merge_to_node("crosshair", /* ICON(cursor/modifier/) */ "joinnode"),
102 move(Cursor.MOVE_CURSOR);
103
104 private final Cursor c;
105 SelectActionCursor(String main, String sub) {
106 c = ImageProvider.getCursor(main, sub);
107 }
108
109 SelectActionCursor(int systemCursor) {
110 c = Cursor.getPredefinedCursor(systemCursor);
111 }
112
113 public Cursor cursor() {
114 return c;
115 }
116 }
117
118 private boolean lassoMode;
119 public boolean repeatedKeySwitchLassoOption;
120
121 // Cache previous mouse event (needed when only the modifier keys are
122 // pressed but the mouse isn't moved)
123 private MouseEvent oldEvent;
124
125 private Mode mode;
126 private final transient SelectionManager selectionManager;
127 private boolean cancelDrawMode;
128 private boolean drawTargetHighlight;
129 private boolean didMouseDrag;
130 /**
131 * The component this SelectAction is associated with.
132 */
133 private final MapView mv;
134 /**
135 * The old cursor before the user pressed the mouse button.
136 */
137 private Point startingDraggingPos;
138 /**
139 * point where user pressed the mouse to start movement
140 */
141 private EastNorth startEN;
142 /**
143 * The last known position of the mouse.
144 */
145 private Point lastMousePos;
146 /**
147 * The time of the user mouse down event.
148 */
149 private long mouseDownTime;
150 /**
151 * The pressed button of the user mouse down event.
152 */
153 private int mouseDownButton;
154 /**
155 * The time of the user mouse down event.
156 */
157 private long mouseReleaseTime;
158 /**
159 * The time which needs to pass between click and release before something
160 * counts as a move, in milliseconds
161 */
162 private int initialMoveDelay;
163 /**
164 * The screen distance which needs to be travelled before something
165 * counts as a move, in pixels
166 */
167 private int initialMoveThreshold;
168 private boolean initialMoveThresholdExceeded;
169
170 /**
171 * elements that have been highlighted in the previous iteration. Used
172 * to remove the highlight from them again as otherwise the whole data
173 * set would have to be checked.
174 */
175 private transient Set<OsmPrimitive> oldHighlights = new HashSet<>();
176
177 /**
178 * Create a new SelectAction
179 * @param mapFrame The MapFrame this action belongs to.
180 */
181 public SelectAction(MapFrame mapFrame) {
182 super(tr("Select"), "move/move", tr("Select, move, scale and rotate objects"),
183 Shortcut.registerShortcut("mapmode:select", tr("Mode: {0}", tr("Select")), KeyEvent.VK_S, Shortcut.DIRECT),
184 mapFrame,
185 ImageProvider.getCursor("normal", "selection"));
186 mv = mapFrame.mapView;
187 putValue("help", ht("/Action/Select"));
188 selectionManager = new SelectionManager(this, false, mv);
189 }
190
191 @Override
192 public void enterMode() {
193 super.enterMode();
194 mv.addMouseListener(this);
195 mv.addMouseMotionListener(this);
196 mv.setVirtualNodesEnabled(Main.pref.getInteger("mappaint.node.virtual-size", 8) != 0);
197 drawTargetHighlight = Main.pref.getBoolean("draw.target-highlight", true);
198 initialMoveDelay = Main.pref.getInteger("edit.initial-move-delay", 200);
199 initialMoveThreshold = Main.pref.getInteger("edit.initial-move-threshold", 5);
200 repeatedKeySwitchLassoOption = Main.pref.getBoolean("mappaint.select.toggle-lasso-on-repeated-S", true);
201 cycleManager.init();
202 virtualManager.init();
203 // This is required to update the cursors when ctrl/shift/alt is pressed
204 Main.map.keyDetector.addModifierListener(this);
205 Main.map.keyDetector.addKeyListener(this);
206 }
207
208 @Override
209 public void exitMode() {
210 super.exitMode();
211 selectionManager.unregister(mv);
212 mv.removeMouseListener(this);
213 mv.removeMouseMotionListener(this);
214 mv.setVirtualNodesEnabled(false);
215 Main.map.keyDetector.removeModifierListener(this);
216 Main.map.keyDetector.removeKeyListener(this);
217 removeHighlighting();
218 }
219
220 @Override
221 public void modifiersChanged(int modifiers) {
222 if (!Main.isDisplayingMapView() || oldEvent == null) return;
223 if (giveUserFeedback(oldEvent, modifiers)) {
224 mv.repaint();
225 }
226 }
227
228 /**
229 * handles adding highlights and updating the cursor for the given mouse event.
230 * Please note that the highlighting for merging while moving is handled via mouseDragged.
231 * @param e {@code MouseEvent} which should be used as base for the feedback
232 * @return {@code true} if repaint is required
233 */
234 private boolean giveUserFeedback(MouseEvent e) {
235 return giveUserFeedback(e, e.getModifiers());
236 }
237
238 /**
239 * handles adding highlights and updating the cursor for the given mouse event.
240 * Please note that the highlighting for merging while moving is handled via mouseDragged.
241 * @param e {@code MouseEvent} which should be used as base for the feedback
242 * @param modifiers define custom keyboard modifiers if the ones from MouseEvent are outdated or similar
243 * @return {@code true} if repaint is required
244 */
245 private boolean giveUserFeedback(MouseEvent e, int modifiers) {
246 Collection<OsmPrimitive> c = asColl(
247 mv.getNearestNodeOrWay(e.getPoint(), mv.isSelectablePredicate, true));
248
249 updateKeyModifiers(modifiers);
250 determineMapMode(!c.isEmpty());
251
252 Set<OsmPrimitive> newHighlights = new HashSet<>();
253
254 virtualManager.clear();
255 if (mode == Mode.MOVE && !dragInProgress() && virtualManager.activateVirtualNodeNearPoint(e.getPoint())) {
256 DataSet ds = getLayerManager().getEditDataSet();
257 if (ds != null && drawTargetHighlight) {
258 ds.setHighlightedVirtualNodes(virtualManager.virtualWays);
259 }
260 mv.setNewCursor(SelectActionCursor.virtual_node.cursor(), this);
261 // don't highlight anything else if a virtual node will be
262 return repaintIfRequired(newHighlights);
263 }
264
265 mv.setNewCursor(getCursor(c), this);
266
267 // return early if there can't be any highlights
268 if (!drawTargetHighlight || mode != Mode.MOVE || c.isEmpty())
269 return repaintIfRequired(newHighlights);
270
271 // CTRL toggles selection, but if while dragging CTRL means merge
272 final boolean isToggleMode = ctrl && !dragInProgress();
273 for (OsmPrimitive x : c) {
274 // only highlight primitives that will change the selection
275 // when clicked. I.e. don't highlight selected elements unless
276 // we are in toggle mode.
277 if (isToggleMode || !x.isSelected()) {
278 newHighlights.add(x);
279 }
280 }
281 return repaintIfRequired(newHighlights);
282 }
283
284 /**
285 * works out which cursor should be displayed for most of SelectAction's
286 * features. The only exception is the "move" cursor when actually dragging
287 * primitives.
288 * @param nearbyStuff primitives near the cursor
289 * @return the cursor that should be displayed
290 */
291 private Cursor getCursor(Collection<OsmPrimitive> nearbyStuff) {
292 String c = "rect";
293 switch(mode) {
294 case MOVE:
295 if (virtualManager.hasVirtualNode()) {
296 c = "virtual_node";
297 break;
298 }
299 final Iterator<OsmPrimitive> it = nearbyStuff.iterator();
300 final OsmPrimitive osm = it.hasNext() ? it.next() : null;
301
302 if (dragInProgress()) {
303 // only consider merge if ctrl is pressed and there are nodes in
304 // the selection that could be merged
305 if (!ctrl || getLayerManager().getEditDataSet().getSelectedNodes().isEmpty()) {
306 c = "move";
307 break;
308 }
309 // only show merge to node cursor if nearby node and that node is currently
310 // not being dragged
311 final boolean hasTarget = osm instanceof Node && !osm.isSelected();
312 c = hasTarget ? "merge_to_node" : "merge";
313 break;
314 }
315
316 c = (osm instanceof Node) ? "node" : c;
317 c = (osm instanceof Way) ? "way" : c;
318 if (shift) {
319 c += "_add";
320 } else if (ctrl) {
321 c += osm == null || osm.isSelected() ? "_rm" : "_add";
322 }
323 break;
324 case ROTATE:
325 c = "rotate";
326 break;
327 case SCALE:
328 c = "scale";
329 break;
330 case SELECT:
331 if (lassoMode) {
332 c = "lasso";
333 } else {
334 c = "rect" + (shift ? "_add" : (ctrl && !Main.isPlatformOsx() ? "_rm" : ""));
335 }
336 break;
337 }
338 return SelectActionCursor.valueOf(c).cursor();
339 }
340
341 /**
342 * Removes all existing highlights.
343 * @return true if a repaint is required
344 */
345 private boolean removeHighlighting() {
346 boolean needsRepaint = false;
347 DataSet ds = getLayerManager().getEditDataSet();
348 if (ds != null && !ds.getHighlightedVirtualNodes().isEmpty()) {
349 needsRepaint = true;
350 ds.clearHighlightedVirtualNodes();
351 }
352 if (oldHighlights.isEmpty())
353 return needsRepaint;
354
355 for (OsmPrimitive prim : oldHighlights) {
356 prim.setHighlighted(false);
357 }
358 oldHighlights = new HashSet<>();
359 return true;
360 }
361
362 private boolean repaintIfRequired(Set<OsmPrimitive> newHighlights) {
363 if (!drawTargetHighlight)
364 return false;
365
366 boolean needsRepaint = false;
367 for (OsmPrimitive x : newHighlights) {
368 if (oldHighlights.contains(x)) {
369 continue;
370 }
371 needsRepaint = true;
372 x.setHighlighted(true);
373 }
374 oldHighlights.removeAll(newHighlights);
375 for (OsmPrimitive x : oldHighlights) {
376 x.setHighlighted(false);
377 needsRepaint = true;
378 }
379 oldHighlights = newHighlights;
380 return needsRepaint;
381 }
382
383 /**
384 * Look, whether any object is selected. If not, select the nearest node.
385 * If there are no nodes in the dataset, do nothing.
386 *
387 * If the user did not press the left mouse button, do nothing.
388 *
389 * Also remember the starting position of the movement and change the mouse
390 * cursor to movement.
391 */
392 @Override
393 public void mousePressed(MouseEvent e) {
394 mouseDownButton = e.getButton();
395 // return early
396 if (!mv.isActiveLayerVisible() || !(Boolean) this.getValue("active") || mouseDownButton != MouseEvent.BUTTON1)
397 return;
398
399 // left-button mouse click only is processed here
400
401 // request focus in order to enable the expected keyboard shortcuts
402 mv.requestFocus();
403
404 // update which modifiers are pressed (shift, alt, ctrl)
405 updateKeyModifiers(e);
406
407 // We don't want to change to draw tool if the user tries to (de)select
408 // stuff but accidentally clicks in an empty area when selection is empty
409 cancelDrawMode = shift || ctrl;
410 didMouseDrag = false;
411 initialMoveThresholdExceeded = false;
412 mouseDownTime = System.currentTimeMillis();
413 lastMousePos = e.getPoint();
414 startEN = mv.getEastNorth(lastMousePos.x, lastMousePos.y);
415
416 // primitives under cursor are stored in c collection
417
418 OsmPrimitive nearestPrimitive = mv.getNearestNodeOrWay(e.getPoint(), mv.isSelectablePredicate, true);
419
420 determineMapMode(nearestPrimitive != null);
421
422 switch(mode) {
423 case ROTATE:
424 case SCALE:
425 // if nothing was selected, select primitive under cursor for scaling or rotating
426 DataSet ds = getLayerManager().getEditDataSet();
427 if (ds.selectionEmpty()) {
428 ds.setSelected(asColl(nearestPrimitive));
429 }
430
431 // Mode.select redraws when selectPrims is called
432 // Mode.move redraws when mouseDragged is called
433 // Mode.rotate redraws here
434 // Mode.scale redraws here
435 break;
436 case MOVE:
437 // also include case when some primitive is under cursor and no shift+ctrl / alt+ctrl is pressed
438 // so this is not movement, but selection on primitive under cursor
439 if (!cancelDrawMode && nearestPrimitive instanceof Way) {
440 virtualManager.activateVirtualNodeNearPoint(e.getPoint());
441 }
442 OsmPrimitive toSelect = cycleManager.cycleSetup(nearestPrimitive, e.getPoint());
443 selectPrims(asColl(toSelect), false, false);
444 useLastMoveCommandIfPossible();
445 // Schedule a timer to update status line "initialMoveDelay+1" ms in the future
446 GuiHelper.scheduleTimer(initialMoveDelay+1, evt -> updateStatusLine(), false);
447 break;
448 case SELECT:
449 default:
450 if (!(ctrl && Main.isPlatformOsx())) {
451 // start working with rectangle or lasso
452 selectionManager.register(mv, lassoMode);
453 selectionManager.mousePressed(e);
454 break;
455 }
456 }
457 if (giveUserFeedback(e)) {
458 mv.repaint();
459 }
460 updateStatusLine();
461 }
462
463 @Override
464 public void mouseMoved(MouseEvent e) {
465 // Mac OSX simulates with ctrl + mouse 1 the second mouse button hence no dragging events get fired.
466 if (Main.isPlatformOsx() && (mode == Mode.ROTATE || mode == Mode.SCALE)) {
467 mouseDragged(e);
468 return;
469 }
470 oldEvent = e;
471 if (giveUserFeedback(e)) {
472 mv.repaint();
473 }
474 }
475
476 /**
477 * If the left mouse button is pressed, move all currently selected
478 * objects (if one of them is under the mouse) or the current one under the
479 * mouse (which will become selected).
480 */
481 @Override
482 public void mouseDragged(MouseEvent e) {
483 if (!mv.isActiveLayerVisible())
484 return;
485
486 // Swing sends random mouseDragged events when closing dialogs by double-clicking their top-left icon on Windows
487 // Ignore such false events to prevent issues like #7078
488 if (mouseDownButton == MouseEvent.BUTTON1 && mouseReleaseTime > mouseDownTime)
489 return;
490
491 cancelDrawMode = true;
492 if (mode == Mode.SELECT) {
493 // Unregisters selectionManager if ctrl has been pressed after mouse click on Mac OS X in order to move the map
494 if (ctrl && Main.isPlatformOsx()) {
495 selectionManager.unregister(mv);
496 // Make sure correct cursor is displayed
497 mv.setNewCursor(Cursor.MOVE_CURSOR, this);
498 }
499 return;
500 }
501
502 // do not count anything as a move if it lasts less than 100 milliseconds.
503 if ((mode == Mode.MOVE) && (System.currentTimeMillis() - mouseDownTime < initialMoveDelay))
504 return;
505
506 if (mode != Mode.ROTATE && mode != Mode.SCALE && (e.getModifiersEx() & MouseEvent.BUTTON1_DOWN_MASK) == 0) {
507 // button is pressed in rotate mode
508 return;
509 }
510
511 if (mode == Mode.MOVE) {
512 // If ctrl is pressed we are in merge mode. Look for a nearby node,
513 // highlight it and adjust the cursor accordingly.
514 final boolean canMerge = ctrl && !getLayerManager().getEditDataSet().getSelectedNodes().isEmpty();
515 final OsmPrimitive p = canMerge ? findNodeToMergeTo(e.getPoint()) : null;
516 boolean needsRepaint = removeHighlighting();
517 if (p != null) {
518 p.setHighlighted(true);
519 oldHighlights.add(p);
520 needsRepaint = true;
521 }
522 mv.setNewCursor(getCursor(asColl(p)), this);
523 // also update the stored mouse event, so we can display the correct cursor
524 // when dragging a node onto another one and then press CTRL to merge
525 oldEvent = e;
526 if (needsRepaint) {
527 mv.repaint();
528 }
529 }
530
531 if (startingDraggingPos == null) {
532 startingDraggingPos = new Point(e.getX(), e.getY());
533 }
534
535 if (lastMousePos == null) {
536 lastMousePos = e.getPoint();
537 return;
538 }
539
540 if (!initialMoveThresholdExceeded) {
541 int dp = (int) lastMousePos.distance(e.getX(), e.getY());
542 if (dp < initialMoveThreshold)
543 return; // ignore small drags
544 initialMoveThresholdExceeded = true; //no more ingnoring uintil nex mouse press
545 }
546 if (e.getPoint().equals(lastMousePos))
547 return;
548
549 EastNorth currentEN = mv.getEastNorth(e.getX(), e.getY());
550
551 if (virtualManager.hasVirtualWaysToBeConstructed()) {
552 virtualManager.createMiddleNodeFromVirtual(currentEN);
553 } else {
554 if (!updateCommandWhileDragging(currentEN)) return;
555 }
556
557 mv.repaint();
558 if (mode != Mode.SCALE) {
559 lastMousePos = e.getPoint();
560 }
561
562 didMouseDrag = true;
563 }
564
565 @Override
566 public void mouseExited(MouseEvent e) {
567 if (removeHighlighting()) {
568 mv.repaint();
569 }
570 }
571
572 @Override
573 public void mouseReleased(MouseEvent e) {
574 if (!mv.isActiveLayerVisible())
575 return;
576
577 startingDraggingPos = null;
578 mouseReleaseTime = System.currentTimeMillis();
579
580 if (mode == Mode.SELECT) {
581 if (e.getButton() != MouseEvent.BUTTON1) {
582 return;
583 }
584 selectionManager.endSelecting(e);
585 selectionManager.unregister(mv);
586
587 // Select Draw Tool if no selection has been made
588 if (!cancelDrawMode && getLayerManager().getEditDataSet().selectionEmpty()) {
589 Main.map.selectDrawTool(true);
590 updateStatusLine();
591 return;
592 }
593 }
594
595 if (mode == Mode.MOVE && e.getButton() == MouseEvent.BUTTON1) {
596 if (!didMouseDrag) {
597 // only built in move mode
598 virtualManager.clear();
599 // do nothing if the click was to short too be recognized as a drag,
600 // but the release position is farther than 10px away from the press position
601 if (lastMousePos == null || lastMousePos.distanceSq(e.getPoint()) < 100) {
602 updateKeyModifiers(e);
603 selectPrims(cycleManager.cyclePrims(), true, false);
604
605 // If the user double-clicked a node, change to draw mode
606 Collection<OsmPrimitive> c = getLayerManager().getEditDataSet().getSelected();
607 if (e.getClickCount() >= 2 && c.size() == 1 && c.iterator().next() instanceof Node) {
608 // We need to do it like this as otherwise drawAction will see a double
609 // click and switch back to SelectMode
610 Main.worker.execute(() -> Main.map.selectDrawTool(true));
611 return;
612 }
613 }
614 } else {
615 confirmOrUndoMovement(e);
616 }
617 }
618
619 mode = null;
620
621 // simply remove any highlights if the middle click popup is active because
622 // the highlights don't depend on the cursor position there. If something was
623 // selected beforehand this would put us into move mode as well, which breaks
624 // the cycling through primitives on top of each other (see #6739).
625 if (e.getButton() == MouseEvent.BUTTON2) {
626 removeHighlighting();
627 } else {
628 giveUserFeedback(e);
629 }
630 updateStatusLine();
631 }
632
633 @Override
634 public void selectionEnded(Rectangle r, MouseEvent e) {
635 updateKeyModifiers(e);
636 selectPrims(selectionManager.getSelectedObjects(alt), true, true);
637 }
638
639 @Override
640 public void doKeyPressed(KeyEvent e) {
641 if (!repeatedKeySwitchLassoOption || !Main.isDisplayingMapView() || !getShortcut().isEvent(e))
642 return;
643 if (Main.isDebugEnabled()) {
644 Main.debug(getClass().getName()+" consuming event "+e);
645 }
646 e.consume();
647 if (!lassoMode) {
648 Main.map.selectMapMode(Main.map.mapModeSelectLasso);
649 } else {
650 Main.map.selectMapMode(Main.map.mapModeSelect);
651 }
652 }
653
654 @Override
655 public void doKeyReleased(KeyEvent e) {
656 // Do nothing
657 }
658
659 /**
660 * sets the mapmode according to key modifiers and if there are any
661 * selectables nearby. Everything has to be pre-determined for this
662 * function; its main purpose is to centralize what the modifiers do.
663 * @param hasSelectionNearby {@code true} if some primitves are selectable nearby
664 */
665 private void determineMapMode(boolean hasSelectionNearby) {
666 if (shift && ctrl) {
667 mode = Mode.ROTATE;
668 } else if (alt && ctrl) {
669 mode = Mode.SCALE;
670 } else if (hasSelectionNearby || dragInProgress()) {
671 mode = Mode.MOVE;
672 } else {
673 mode = Mode.SELECT;
674 }
675 }
676
677 /**
678 * Determines whenever elements have been grabbed and moved (i.e. the initial
679 * thresholds have been exceeded) and is still in progress (i.e. mouse button still pressed)
680 * @return true if a drag is in progress
681 */
682 private boolean dragInProgress() {
683 return didMouseDrag && startingDraggingPos != null;
684 }
685
686 /**
687 * Create or update data modification command while dragging mouse - implementation of
688 * continuous moving, scaling and rotation
689 * @param currentEN - mouse position
690 * @return status of action (<code>true</code> when action was performed)
691 */
692 private boolean updateCommandWhileDragging(EastNorth currentEN) {
693 // Currently we support only transformations which do not affect relations.
694 // So don't add them in the first place to make handling easier
695 DataSet ds = getLayerManager().getEditDataSet();
696 Collection<OsmPrimitive> selection = ds.getSelectedNodesAndWays();
697 if (selection.isEmpty()) { // if nothing was selected to drag, just select nearest node/way to the cursor
698 OsmPrimitive nearestPrimitive = mv.getNearestNodeOrWay(mv.getPoint(startEN), mv.isSelectablePredicate, true);
699 ds.setSelected(nearestPrimitive);
700 }
701
702 Collection<Node> affectedNodes = AllNodesVisitor.getAllNodes(selection);
703 // for these transformations, having only one node makes no sense - quit silently
704 if (affectedNodes.size() < 2 && (mode == Mode.ROTATE || mode == Mode.SCALE)) {
705 return false;
706 }
707 Command c = getLastCommand();
708 if (mode == Mode.MOVE) {
709 if (startEN == null) return false; // fix #8128
710 ds.beginUpdate();
711 if (c instanceof MoveCommand && affectedNodes.equals(((MoveCommand) c).getParticipatingPrimitives())) {
712 ((MoveCommand) c).saveCheckpoint();
713 ((MoveCommand) c).applyVectorTo(currentEN);
714 } else {
715 c = new MoveCommand(selection, startEN, currentEN);
716 Main.main.undoRedo.add(c);
717 }
718 for (Node n : affectedNodes) {
719 LatLon ll = n.getCoor();
720 if (ll != null && ll.isOutSideWorld()) {
721 // Revert move
722 ((MoveCommand) c).resetToCheckpoint();
723 ds.endUpdate();
724 JOptionPane.showMessageDialog(
725 Main.parent,
726 tr("Cannot move objects outside of the world."),
727 tr("Warning"),
728 JOptionPane.WARNING_MESSAGE);
729 mv.setNewCursor(cursor, this);
730 return false;
731 }
732 }
733 } else {
734 startEN = currentEN; // drag can continue after scaling/rotation
735
736 if (mode != Mode.ROTATE && mode != Mode.SCALE) {
737 return false;
738 }
739
740 ds.beginUpdate();
741
742 if (mode == Mode.ROTATE) {
743 if (c instanceof RotateCommand && affectedNodes.equals(((RotateCommand) c).getTransformedNodes())) {
744 ((RotateCommand) c).handleEvent(currentEN);
745 } else {
746 Main.main.undoRedo.add(new RotateCommand(selection, currentEN));
747 }
748 } else if (mode == Mode.SCALE) {
749 if (c instanceof ScaleCommand && affectedNodes.equals(((ScaleCommand) c).getTransformedNodes())) {
750 ((ScaleCommand) c).handleEvent(currentEN);
751 } else {
752 Main.main.undoRedo.add(new ScaleCommand(selection, currentEN));
753 }
754 }
755
756 Collection<Way> ways = ds.getSelectedWays();
757 if (doesImpactStatusLine(affectedNodes, ways)) {
758 Main.map.statusLine.setDist(ways);
759 }
760 }
761 ds.endUpdate();
762 return true;
763 }
764
765 private static boolean doesImpactStatusLine(Collection<Node> affectedNodes, Collection<Way> selectedWays) {
766 for (Way w : selectedWays) {
767 for (Node n : w.getNodes()) {
768 if (affectedNodes.contains(n)) {
769 return true;
770 }
771 }
772 }
773 return false;
774 }
775
776 /**
777 * Adapt last move command (if it is suitable) to work with next drag, started at point startEN
778 */
779 private void useLastMoveCommandIfPossible() {
780 Command c = getLastCommand();
781 Collection<Node> affectedNodes = AllNodesVisitor.getAllNodes(getLayerManager().getEditDataSet().getSelected());
782 if (c instanceof MoveCommand && affectedNodes.equals(((MoveCommand) c).getParticipatingPrimitives())) {
783 // old command was created with different base point of movement, we need to recalculate it
784 ((MoveCommand) c).changeStartPoint(startEN);
785 }
786 }
787
788 /**
789 * Obtain command in undoRedo stack to "continue" when dragging
790 * @return last command
791 */
792 private static Command getLastCommand() {
793 Command c = !Main.main.undoRedo.commands.isEmpty()
794 ? Main.main.undoRedo.commands.getLast() : null;
795 if (c instanceof SequenceCommand) {
796 c = ((SequenceCommand) c).getLastCommand();
797 }
798 return c;
799 }
800
801 /**
802 * Present warning in the following cases and undo unwanted movements: <ul>
803 * <li>large and possibly unwanted movements</li>
804 * <li>movement of node with attached ways that are hidden by filters</li>
805 * </ul>
806 *
807 * @param e the mouse event causing the action (mouse released)
808 */
809 private void confirmOrUndoMovement(MouseEvent e) {
810 if (movesHiddenWay()) {
811 final ExtendedDialog ed = new ConfirmMoveDialog();
812 ed.setContent(tr("Are you sure that you want to move elements with attached ways that are hidden by filters?"));
813 ed.toggleEnable("movedHiddenElements");
814 ed.showDialog();
815 if (ed.getValue() != 1) {
816 Main.main.undoRedo.undo();
817 }
818 }
819 int max = Main.pref.getInteger("warn.move.maxelements", 20), limit = max;
820 for (OsmPrimitive osm : getLayerManager().getEditDataSet().getSelected()) {
821 if (osm instanceof Way) {
822 limit -= ((Way) osm).getNodes().size();
823 }
824 if (--limit < 0) {
825 break;
826 }
827 }
828 if (limit < 0) {
829 final ExtendedDialog ed = new ConfirmMoveDialog();
830 ed.setContent(
831 /* for correct i18n of plural forms - see #9110 */
832 trn("You moved more than {0} element. " + "Moving a large number of elements is often an error.\n" + "Really move them?",
833 "You moved more than {0} elements. " + "Moving a large number of elements is often an error.\n" + "Really move them?",
834 max, max));
835 ed.toggleEnable("movedManyElements");
836 ed.showDialog();
837
838 if (ed.getValue() != 1) {
839 Main.main.undoRedo.undo();
840 }
841 } else {
842 // if small number of elements were moved,
843 updateKeyModifiers(e);
844 if (ctrl) mergePrims(e.getPoint());
845 }
846 getLayerManager().getEditDataSet().fireSelectionChanged();
847 }
848
849 static class ConfirmMoveDialog extends ExtendedDialog {
850 ConfirmMoveDialog() {
851 super(Main.parent,
852 tr("Move elements"),
853 new String[]{tr("Move them"), tr("Undo move")});
854 setButtonIcons(new String[]{"reorder", "cancel"});
855 setCancelButton(2);
856 }
857 }
858
859 private boolean movesHiddenWay() {
860 DataSet ds = getLayerManager().getEditDataSet();
861 final Collection<OsmPrimitive> elementsToTest = new HashSet<>(ds.getSelected());
862 for (Way osm : Utils.filteredCollection(ds.getSelected(), Way.class)) {
863 elementsToTest.addAll(osm.getNodes());
864 }
865 for (OsmPrimitive node : Utils.filteredCollection(elementsToTest, Node.class)) {
866 for (Way ref : Utils.filteredCollection(node.getReferrers(), Way.class)) {
867 if (ref.isDisabledAndHidden()) {
868 return true;
869 }
870 }
871 }
872 return false;
873 }
874
875 /**
876 * Merges the selected nodes to the one closest to the given mouse position if the control
877 * key is pressed. If there is no such node, no action will be done and no error will be
878 * reported. If there is, it will execute the merge and add it to the undo buffer.
879 * @param p mouse position
880 */
881 private void mergePrims(Point p) {
882 DataSet ds = getLayerManager().getEditDataSet();
883 Collection<Node> selNodes = ds.getSelectedNodes();
884 if (selNodes.isEmpty())
885 return;
886
887 Node target = findNodeToMergeTo(p);
888 if (target == null)
889 return;
890
891 if (selNodes.size() == 1) {
892 // Move all selected primitive to preserve shape #10748
893 Collection<OsmPrimitive> selection = ds.getSelectedNodesAndWays();
894 Collection<Node> affectedNodes = AllNodesVisitor.getAllNodes(selection);
895 Command c = getLastCommand();
896 ds.beginUpdate();
897 if (c instanceof MoveCommand
898 && affectedNodes.equals(((MoveCommand) c).getParticipatingPrimitives())) {
899 Node selectedNode = selNodes.iterator().next();
900 EastNorth selectedEN = selectedNode.getEastNorth();
901 EastNorth targetEN = target.getEastNorth();
902 ((MoveCommand) c).moveAgain(targetEN.getX() - selectedEN.getX(),
903 targetEN.getY() - selectedEN.getY());
904 }
905 ds.endUpdate();
906 }
907
908 Collection<Node> nodesToMerge = new LinkedList<>(selNodes);
909 nodesToMerge.add(target);
910 mergeNodes(Main.getLayerManager().getEditLayer(), nodesToMerge, target);
911 }
912
913 /**
914 * Merge nodes using {@code MergeNodesAction}.
915 * Can be overridden for testing purpose.
916 * @param layer layer the reference data layer. Must not be null
917 * @param nodes the collection of nodes. Ignored if null
918 * @param targetLocationNode this node's location will be used for the target node
919 */
920 public void mergeNodes(OsmDataLayer layer, Collection<Node> nodes,
921 Node targetLocationNode) {
922 MergeNodesAction.doMergeNodes(layer, nodes, targetLocationNode);
923 }
924
925 /**
926 * Tries to find a node to merge to when in move-merge mode for the current mouse
927 * position. Either returns the node or null, if no suitable one is nearby.
928 * @param p mouse position
929 * @return node to merge to, or null
930 */
931 private Node findNodeToMergeTo(Point p) {
932 Collection<Node> target = mv.getNearestNodes(p,
933 getLayerManager().getEditDataSet().getSelectedNodes(),
934 mv.isSelectablePredicate);
935 return target.isEmpty() ? null : target.iterator().next();
936 }
937
938 private void selectPrims(Collection<OsmPrimitive> prims, boolean released, boolean area) {
939 DataSet ds = getLayerManager().getEditDataSet();
940
941 // not allowed together: do not change dataset selection, return early
942 // Virtual Ways: if non-empty the cursor is above a virtual node. So don't highlight
943 // anything if about to drag the virtual node (i.e. !released) but continue if the
944 // cursor is only released above a virtual node by accident (i.e. released). See #7018
945 if (ds == null || (shift && ctrl) || (ctrl && !released) || (virtualManager.hasVirtualWaysToBeConstructed() && !released))
946 return;
947
948 if (!released) {
949 // Don't replace the selection if the user clicked on a
950 // selected object (it breaks moving of selected groups).
951 // Do it later, on mouse release.
952 shift |= ds.getSelected().containsAll(prims);
953 }
954
955 if (ctrl) {
956 // Ctrl on an item toggles its selection status,
957 // but Ctrl on an *area* just clears those items
958 // out of the selection.
959 if (area) {
960 ds.clearSelection(prims);
961 } else {
962 ds.toggleSelected(prims);
963 }
964 } else if (shift) {
965 // add prims to an existing selection
966 ds.addSelected(prims);
967 } else {
968 // clear selection, then select the prims clicked
969 ds.setSelected(prims);
970 }
971 }
972
973 /**
974 * Returns the current select mode.
975 * @return the select mode
976 * @since 7543
977 */
978 public final Mode getMode() {
979 return mode;
980 }
981
982 @Override
983 public String getModeHelpText() {
984 if (mouseDownButton == MouseEvent.BUTTON1 && mouseReleaseTime < mouseDownTime) {
985 if (mode == Mode.SELECT)
986 return tr("Release the mouse button to select the objects in the rectangle.");
987 else if (mode == Mode.MOVE && (System.currentTimeMillis() - mouseDownTime >= initialMoveDelay)) {
988 final DataSet ds = getLayerManager().getEditDataSet();
989 final boolean canMerge = ds != null && !ds.getSelectedNodes().isEmpty();
990 final String mergeHelp = canMerge ? (' ' + tr("Ctrl to merge with nearest node.")) : "";
991 return tr("Release the mouse button to stop moving.") + mergeHelp;
992 } else if (mode == Mode.ROTATE)
993 return tr("Release the mouse button to stop rotating.");
994 else if (mode == Mode.SCALE)
995 return tr("Release the mouse button to stop scaling.");
996 }
997 return tr("Move objects by dragging; Shift to add to selection (Ctrl to toggle); Shift-Ctrl to rotate selected; " +
998 "Alt-Ctrl to scale selected; or change selection");
999 }
1000
1001 @Override
1002 public boolean layerIsSupported(Layer l) {
1003 return l instanceof OsmDataLayer;
1004 }
1005
1006 /**
1007 * Enable or diable the lasso mode
1008 * @param lassoMode true to enable the lasso mode, false otherwise
1009 */
1010 public void setLassoMode(boolean lassoMode) {
1011 this.selectionManager.setLassoMode(lassoMode);
1012 this.lassoMode = lassoMode;
1013 }
1014
1015 private final transient CycleManager cycleManager = new CycleManager();
1016 private final transient VirtualManager virtualManager = new VirtualManager();
1017
1018 private class CycleManager {
1019
1020 private Collection<OsmPrimitive> cycleList = Collections.emptyList();
1021 private boolean cyclePrims;
1022 private OsmPrimitive cycleStart;
1023 private boolean waitForMouseUpParameter;
1024 private boolean multipleMatchesParameter;
1025 /**
1026 * read preferences
1027 */
1028 private void init() {
1029 waitForMouseUpParameter = Main.pref.getBoolean("mappaint.select.waits-for-mouse-up", false);
1030 multipleMatchesParameter = Main.pref.getBoolean("selectaction.cycles.multiple.matches", false);
1031 }
1032
1033 /**
1034 * Determine primitive to be selected and build cycleList
1035 * @param nearest primitive found by simple method
1036 * @param p point where user clicked
1037 * @return OsmPrimitive to be selected
1038 */
1039 private OsmPrimitive cycleSetup(OsmPrimitive nearest, Point p) {
1040 OsmPrimitive osm = null;
1041
1042 if (nearest != null) {
1043 osm = nearest;
1044
1045 if (!(alt || multipleMatchesParameter)) {
1046 // no real cycling, just one element in cycle list
1047 cycleList = asColl(osm);
1048
1049 if (waitForMouseUpParameter) {
1050 // prefer a selected nearest node or way, if possible
1051 osm = mv.getNearestNodeOrWay(p, mv.isSelectablePredicate, true);
1052 }
1053 } else {
1054 // Alt + left mouse button pressed: we need to build cycle list
1055 cycleList = mv.getAllNearest(p, mv.isSelectablePredicate);
1056
1057 if (cycleList.size() > 1) {
1058 cyclePrims = false;
1059
1060 // find first already selected element in cycle list
1061 OsmPrimitive old = osm;
1062 for (OsmPrimitive o : cycleList) {
1063 if (o.isSelected()) {
1064 cyclePrims = true;
1065 osm = o;
1066 break;
1067 }
1068 }
1069
1070 // special case: for cycle groups of 2, we can toggle to the
1071 // true nearest primitive on mousePressed right away
1072 if (cycleList.size() == 2 && !waitForMouseUpParameter) {
1073 if (!(osm.equals(old) || osm.isNew() || ctrl)) {
1074 cyclePrims = false;
1075 osm = old;
1076 } // else defer toggling to mouseRelease time in those cases:
1077 /*
1078 * osm == old -- the true nearest node is the
1079 * selected one osm is a new node -- do not break
1080 * unglue ways in ALT mode ctrl is pressed -- ctrl
1081 * generally works on mouseReleased
1082 */
1083 }
1084 }
1085 }
1086 }
1087 return osm;
1088 }
1089
1090 /**
1091 * Modifies current selection state and returns the next element in a
1092 * selection cycle given by
1093 * <code>cycleList</code> field
1094 * @return the next element of cycle list
1095 */
1096 private Collection<OsmPrimitive> cyclePrims() {
1097 if (cycleList.size() <= 1) {
1098 // no real cycling, just return one-element collection with nearest primitive in it
1099 return cycleList;
1100 }
1101 // updateKeyModifiers() already called before!
1102
1103 DataSet ds = getLayerManager().getEditDataSet();
1104 OsmPrimitive first = cycleList.iterator().next(), foundInDS = null;
1105 OsmPrimitive nxt = first;
1106
1107 if (cyclePrims && shift) {
1108 for (Iterator<OsmPrimitive> i = cycleList.iterator(); i.hasNext();) {
1109 nxt = i.next();
1110 if (!nxt.isSelected()) {
1111 break; // take first primitive in cycleList not in sel
1112 }
1113 }
1114 // if primitives 1,2,3 are under cursor, [Alt-press] [Shift-release] gives 1 -> 12 -> 123
1115 } else {
1116 for (Iterator<OsmPrimitive> i = cycleList.iterator(); i.hasNext();) {
1117 nxt = i.next();
1118 if (nxt.isSelected()) {
1119 foundInDS = nxt;
1120 // first selected primitive in cycleList is found
1121 if (cyclePrims || ctrl) {
1122 ds.clearSelection(foundInDS); // deselect it
1123 nxt = i.hasNext() ? i.next() : first;
1124 // return next one in cycle list (last->first)
1125 }
1126 break; // take next primitive in cycleList
1127 }
1128 }
1129 }
1130
1131 // if "no-alt-cycling" is enabled, Ctrl-Click arrives here.
1132 if (ctrl) {
1133 // a member of cycleList was found in the current dataset selection
1134 if (foundInDS != null) {
1135 // mouse was moved to a different selection group w/ a previous sel
1136 if (!cycleList.contains(cycleStart)) {
1137 ds.clearSelection(cycleList);
1138 cycleStart = foundInDS;
1139 } else if (cycleStart.equals(nxt)) {
1140 // loop detected, insert deselect step
1141 ds.addSelected(nxt);
1142 }
1143 } else {
1144 // setup for iterating a sel group again or a new, different one..
1145 nxt = cycleList.contains(cycleStart) ? cycleStart : first;
1146 cycleStart = nxt;
1147 }
1148 } else {
1149 cycleStart = null;
1150 }
1151 // return one-element collection with one element to be selected (or added to selection)
1152 return asColl(nxt);
1153 }
1154 }
1155
1156 private class VirtualManager {
1157
1158 private Node virtualNode;
1159 private Collection<WaySegment> virtualWays = new LinkedList<>();
1160 private int nodeVirtualSize;
1161 private int virtualSnapDistSq2;
1162 private int virtualSpace;
1163
1164 private void init() {
1165 nodeVirtualSize = Main.pref.getInteger("mappaint.node.virtual-size", 8);
1166 int virtualSnapDistSq = Main.pref.getInteger("mappaint.node.virtual-snap-distance", 8);
1167 virtualSnapDistSq2 = virtualSnapDistSq*virtualSnapDistSq;
1168 virtualSpace = Main.pref.getInteger("mappaint.node.virtual-space", 70);
1169 }
1170
1171 /**
1172 * Calculate a virtual node if there is enough visual space to draw a
1173 * crosshair node and the middle of a way segment is clicked. If the
1174 * user drags the crosshair node, it will be added to all ways in
1175 * <code>virtualWays</code>.
1176 *
1177 * @param p the point clicked
1178 * @return whether
1179 * <code>virtualNode</code> and
1180 * <code>virtualWays</code> were setup.
1181 */
1182 private boolean activateVirtualNodeNearPoint(Point p) {
1183 if (nodeVirtualSize > 0) {
1184
1185 Collection<WaySegment> selVirtualWays = new LinkedList<>();
1186 Pair<Node, Node> vnp = null, wnp = new Pair<>(null, null);
1187
1188 for (WaySegment ws : mv.getNearestWaySegments(p, mv.isSelectablePredicate)) {
1189 Way w = ws.way;
1190
1191 wnp.a = w.getNode(ws.lowerIndex);
1192 wnp.b = w.getNode(ws.lowerIndex + 1);
1193 MapViewPoint p1 = mv.getState().getPointFor(wnp.a);
1194 MapViewPoint p2 = mv.getState().getPointFor(wnp.b);
1195 if (WireframeMapRenderer.isLargeSegment(p1, p2, virtualSpace)) {
1196 Point2D pc = new Point2D.Double((p1.getInViewX() + p2.getInViewX()) / 2, (p1.getInViewY() + p2.getInViewY()) / 2);
1197 if (p.distanceSq(pc) < virtualSnapDistSq2) {
1198 // Check that only segments on top of each other get added to the
1199 // virtual ways list. Otherwise ways that coincidentally have their
1200 // virtual node at the same spot will be joined which is likely unwanted
1201 Pair.sort(wnp);
1202 if (vnp == null) {
1203 vnp = new Pair<>(wnp.a, wnp.b);
1204 virtualNode = new Node(mv.getLatLon(pc.getX(), pc.getY()));
1205 }
1206 if (vnp.equals(wnp)) {
1207 // if mutiple line segments have the same points,
1208 // add all segments to be splitted to virtualWays list
1209 // if some lines are selected, only their segments will go to virtualWays
1210 (w.isSelected() ? selVirtualWays : virtualWays).add(ws);
1211 }
1212 }
1213 }
1214 }
1215
1216 if (!selVirtualWays.isEmpty()) {
1217 virtualWays = selVirtualWays;
1218 }
1219 }
1220
1221 return !virtualWays.isEmpty();
1222 }
1223
1224 private void createMiddleNodeFromVirtual(EastNorth currentEN) {
1225 Collection<Command> virtualCmds = new LinkedList<>();
1226 virtualCmds.add(new AddCommand(virtualNode));
1227 for (WaySegment virtualWay : virtualWays) {
1228 Way w = virtualWay.way;
1229 Way wnew = new Way(w);
1230 wnew.addNode(virtualWay.lowerIndex + 1, virtualNode);
1231 virtualCmds.add(new ChangeCommand(w, wnew));
1232 }
1233 virtualCmds.add(new MoveCommand(virtualNode, startEN, currentEN));
1234 String text = trn("Add and move a virtual new node to way",
1235 "Add and move a virtual new node to {0} ways", virtualWays.size(),
1236 virtualWays.size());
1237 Main.main.undoRedo.add(new SequenceCommand(text, virtualCmds));
1238 getLayerManager().getEditDataSet().setSelected(Collections.singleton((OsmPrimitive) virtualNode));
1239 clear();
1240 }
1241
1242 private void clear() {
1243 virtualWays.clear();
1244 virtualNode = null;
1245 }
1246
1247 private boolean hasVirtualNode() {
1248 return virtualNode != null;
1249 }
1250
1251 private boolean hasVirtualWaysToBeConstructed() {
1252 return !virtualWays.isEmpty();
1253 }
1254 }
1255
1256 /**
1257 * Returns {@code o} as collection of {@code o}'s type.
1258 * @param <T> object type
1259 * @param o any object
1260 * @return {@code o} as collection of {@code o}'s type.
1261 */
1262 protected static <T> Collection<T> asColl(T o) {
1263 return o == null ? Collections.emptySet() : Collections.singleton(o);
1264 }
1265}
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