bundles/org.simantics.g2d/src/org/simantics/g2d/diagram/participant/ElementPainter.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.g2d.diagram.participant;
  13
  14 import java.awt.BasicStroke;
  15 import java.awt.Color;
  16 import java.awt.Composite;
  17 import java.awt.Shape;
  18 import java.awt.geom.AffineTransform;
  19 import java.awt.geom.Point2D;
  20 import java.awt.geom.Rectangle2D;
  21 import java.nio.CharBuffer;
  22 import java.util.ArrayList;
  23 import java.util.Collection;
  24 import java.util.Collections;
  25 import java.util.HashMap;
  26 import java.util.HashSet;
  27 import java.util.Iterator;
  28 import java.util.List;
  29 import java.util.Map;
  30 import java.util.Random;
  31 import java.util.Set;
  32 import java.util.UUID;
  33 import java.util.concurrent.ConcurrentHashMap;
  34 import java.util.concurrent.ConcurrentMap;
  35 import java.util.function.Consumer;
  36
  37 import org.simantics.g2d.canvas.Hints;
  38 import org.simantics.g2d.canvas.ICanvasContext;
  39 import org.simantics.g2d.canvas.impl.DependencyReflection.Dependency;
  40 import org.simantics.g2d.canvas.impl.DependencyReflection.Reference;
  41 import org.simantics.g2d.canvas.impl.HintReflection.HintListener;
  42 import org.simantics.g2d.canvas.impl.SGNodeReflection.SGCleanup;
  43 import org.simantics.g2d.canvas.impl.SGNodeReflection.SGInit;
  44 import org.simantics.g2d.connection.handler.ConnectionHandler;
  45 import org.simantics.g2d.diagram.DiagramHints;
  46 import org.simantics.g2d.diagram.DiagramUtils;
  47 import org.simantics.g2d.diagram.IDiagram;
  48 import org.simantics.g2d.diagram.IDiagram.CompositionListener;
  49 import org.simantics.g2d.diagram.handler.RelationshipHandler;
  50 import org.simantics.g2d.diagram.handler.RelationshipHandler.Relation;
  51 import org.simantics.g2d.diagram.handler.TransactionContext;
  52 import org.simantics.g2d.diagram.handler.TransactionContext.Transaction;
  53 import org.simantics.g2d.diagram.handler.TransactionContext.TransactionListener;
  54 import org.simantics.g2d.element.ElementClass;
  55 import org.simantics.g2d.element.ElementHints;
  56 import org.simantics.g2d.element.ElementUtils;
  57 import org.simantics.g2d.element.IElement;
  58 import org.simantics.g2d.element.SceneGraphNodeKey;
  59 import org.simantics.g2d.element.handler.BendsHandler;
  60 import org.simantics.g2d.element.handler.Children;
  61 import org.simantics.g2d.element.handler.Children.ChildEvent;
  62 import org.simantics.g2d.element.handler.Children.ChildListener;
  63 import org.simantics.g2d.element.handler.FillColor;
  64 import org.simantics.g2d.element.handler.Outline;
  65 import org.simantics.g2d.element.handler.OutlineColorSpec;
  66 import org.simantics.g2d.element.handler.Parent;
  67 import org.simantics.g2d.element.handler.SceneGraph;
  68 import org.simantics.g2d.element.handler.SelectionOutline;
  69 import org.simantics.g2d.element.handler.SelectionSpecification;
  70 import org.simantics.g2d.element.handler.StrokeSpec;
  71 import org.simantics.g2d.element.handler.TerminalTopology;
  72 import org.simantics.g2d.element.handler.Transform;
  73 import org.simantics.g2d.layers.ILayer;
  74 import org.simantics.g2d.layers.ILayersEditor;
  75 import org.simantics.g2d.layers.ILayersEditor.ILayersEditorListener;
  76 import org.simantics.g2d.participant.TransformUtil;
  77 import org.simantics.g2d.scenegraph.SceneGraphConstants;
  78 import org.simantics.g2d.utils.ElementNodeBridge;
  79 import org.simantics.g2d.utils.TopologicalSelectionExpander;
  80 import org.simantics.scenegraph.INode;
  81 import org.simantics.scenegraph.Node;
  82 import org.simantics.scenegraph.g2d.G2DParentNode;
  83 import org.simantics.scenegraph.g2d.G2DSceneGraph;
  84 import org.simantics.scenegraph.g2d.IG2DNode;
  85 import org.simantics.scenegraph.g2d.nodes.ConnectionNode;
  86 import org.simantics.scenegraph.g2d.nodes.DataNode;
  87 import org.simantics.scenegraph.g2d.nodes.LinkNode;
  88 import org.simantics.scenegraph.g2d.nodes.SelectionNode;
  89 import org.simantics.scenegraph.g2d.nodes.ShapeNode;
  90 import org.simantics.scenegraph.g2d.nodes.SingleElementNode;
  91 import org.simantics.scenegraph.g2d.nodes.UnboundedNode;
  92 import org.simantics.scenegraph.g2d.nodes.spatial.RTreeNode;
  93 import org.simantics.scenegraph.utils.ColorUtil;
  94 import org.simantics.scenegraph.utils.NodeUtil;
  95 import org.simantics.utils.datastructures.collections.CollectionUtils;
  96 import org.simantics.utils.datastructures.hints.HintListenerAdapter;
  97 import org.simantics.utils.datastructures.hints.IHintContext.Key;
  98 import org.simantics.utils.datastructures.hints.IHintContext.KeyOf;
  99 import org.simantics.utils.datastructures.hints.IHintListener;
 100 import org.simantics.utils.datastructures.hints.IHintObservable;
 101
 102 /**
 103  * A diagram participant that keeps a diagram and its elements synchronized with
 104  * the active canvas scene graph.
 105  *
 106  * <p>
 107  * Responsibilities include:
 108  * <ul>
 109  * <li>ensure that the scene graph contains a {@link SingleElementNode} instance
 110  * for each diagram element</li>
 111  * <li>ensure that the scene graph node order matches the diagram element order</li>
 112  * <li>ensure that the scene graph contains a {@link SelectionNode} under the
 113  * element instance nodes for each selected node. TODO: maybe try getting
 114  * selection out of here into a different participant, but without cloning the
 115  * entire listening/element<->scene graph updating infrastructure.</li>
 116  * <li></li>
 117  * </ul>
 118  *
 119  * @author Tuukka Lehtonen
 120  *
 121  * @see ElementNodeBridge
 122  */
 123 public class ElementPainter extends AbstractDiagramParticipant implements CompositionListener, TransactionListener, ChildListener {
 124
 125     public static final Key      KEY_SELECTION_PROVIDER = new KeyOf(ISelectionProvider.class);
 126
 127     public static final int SELECTION_PAINT_PRIORITY    = 100;
 128
 129     public static final Key KEY_SELECTION_FRAME_COLOR   = new KeyOf(Color.class, "SELECTION_FRAME_COLOR");
 130     public static final Key KEY_SELECTION_CONTENT_COLOR = new KeyOf(Color.class, "SELECTION_CONTENT_COLOR");
 131
 132
 133     /**
 134      * Implement to customize the way a selection is visualized by
 135      * ElementPainter.
 136      */
 137     public static interface ISelectionProvider {
 138         public void init(final IElement e, final G2DParentNode parentNode, final String nodeId,
 139                 final AffineTransform transform, final Rectangle2D bounds, final Color color);
 140     }
 141
 142     private static final boolean DEBUG                  = false;
 143
 144     public static final int      ELEMENT_PAINT_PRIORITY = 10;
 145
 146     @Reference
 147     ZOrderHandler zOrderHandler;
 148
 149     @Dependency
 150     TransformUtil util;
 151
 152     @Dependency
 153     Selection selection;
 154
 155     SingleElementNode diagramParent;
 156     RTreeNode elementParent;
 157
 158     boolean paintSelectionFrames;
 159
 160     /**
 161      * Internally reused to avert constant reallocation.
 162      */
 163     private transient List<Relation> relations = new ArrayList<Relation>(4);
 164     /**
 165      * Internally reused to avert constant reallocation.
 166      */
 167     private transient Set<IElement> relatedElements = new HashSet<IElement>(8);
 168
 169     public ElementPainter() {
 170         this(true);
 171     }
 172
 173     public ElementPainter(boolean paintSelectionFrames) {
 174         this.paintSelectionFrames = paintSelectionFrames;
 175     }
 176
 177     @Override
 178     public void addedToContext(ICanvasContext ctx) {
 179         super.addedToContext(ctx);
 180         if (zOrderHandler != null) {
 181             zOrderHandler.addOrderListener(zOrderListener);
 182         }
 183     }
 184
 185     @Override
 186     public void removedFromContext(ICanvasContext ctx) {
 187         if (zOrderHandler != null) {
 188             zOrderHandler.removeOrderListener(zOrderListener);
 189         }
 190         selections.clear();
 191         super.removedFromContext(ctx);
 192     }
 193
 194     @Override
 195     protected void onDiagramSet(IDiagram newValue, IDiagram oldValue) {
 196         if (oldValue == newValue)
 197             return;
 198
 199         if (oldValue != null) {
 200             for (IElement e : oldValue.getElements()) {
 201                 removeElement(e);
 202             }
 203
 204             oldValue.removeCompositionListener(this);
 205             oldValue.removeKeyHintListener(Hints.KEY_DIRTY, diagramHintListener);
 206             oldValue.removeKeyHintListener(Hints.KEY_DISABLE_PAINTING, diagramHintListener);
 207
 208             ILayersEditor layers = oldValue.getHint(DiagramHints.KEY_LAYERS_EDITOR);
 209             if (layers != null) {
 210                 layers.removeListener(layersListener);
 211             }
 212
 213             for (TransactionContext tc : oldValue.getDiagramClass().getItemsByClass(TransactionContext.class)) {
 214                 tc.removeTransactionListener(oldValue, this);
 215             }
 216         }
 217
 218         if (newValue != null) {
 219             for (IElement e : newValue.getElements()) {
 220                 addElement(e, false);
 221             }
 222
 223             newValue.addCompositionListener(this);
 224             newValue.addKeyHintListener(Hints.KEY_DISABLE_PAINTING, diagramHintListener);
 225             newValue.addKeyHintListener(Hints.KEY_DIRTY, diagramHintListener);
 226
 227             ILayersEditor layers = newValue.getHint(DiagramHints.KEY_LAYERS_EDITOR);
 228             if (layers != null) {
 229                 layers.addListener(layersListener);
 230             }
 231
 232             for (TransactionContext tc : newValue.getDiagramClass().getItemsByClass(TransactionContext.class)) {
 233                 tc.addTransactionListener(newValue, this);
 234             }
 235         }
 236
 237         updateAll();
 238     }
 239
 240     @SGInit
 241     public void initSG(G2DParentNode parent) {
 242         diagramParent = parent.addNode("elements_"+Node.IDCOUNTER, UnboundedNode.class);
 243         diagramParent.setZIndex(ELEMENT_PAINT_PRIORITY);
 244         elementParent = diagramParent.addNode("spatialRoot", RTreeNode.class);
 245         elementParent.setZIndex(0);
 246     }
 247
 248     @SGCleanup
 249     public void cleanupSG() {
 250         diagramParent.remove();
 251         elementParent = null;
 252         diagramParent = null;
 253     }
 254
 255     public INode getDiagramElementParentNode() {
 256         return elementParent;
 257     }
 258
 259     // <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
 260     // Element z-order listening and update logic
 261     // ------------------------------------------------------------------------
 262
 263     ZOrderListener zOrderListener = new ZOrderListener() {
 264         @Override
 265         public void orderChanged(IDiagram diagram) {
 266             if (diagram == ElementPainter.this.diagram) {
 267                 updateZOrder(diagram, ElementHints.KEY_SG_NODE);
 268             }
 269         }
 270     };
 271
 272     protected static void updateZOrder(IDiagram diagram, Key elementSgNodeKey) {
 273         int zIndex = 0;
 274         for (IElement e : diagram.getElements()) {
 275             Node node = e.getHint(elementSgNodeKey);
 276             if (node instanceof IG2DNode) {
 277                 ((IG2DNode) node).setZIndex(++zIndex);
 278             }
 279         }
 280     }
 281
 282     // ------------------------------------------------------------------------
 283     // Element z-order listening and update logic end
 284     // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
 285
 286
 287     // <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
 288     // Layer configuration change listening and reaction logic
 289     // ------------------------------------------------------------------------
 290
 291     ILayersEditorListener layersListener = new ILayersEditorListener() {
 292         private void layersChanged() {
 293             Object task = BEGIN("EP.layersChanged");
 294             // Update visibility/focusability for each node only, do not reinitialize the graphics.
 295             updateAllVisibility();
 296             END(task);
 297         }
 298         @Override
 299         public void layerRemoved(ILayer layer) {
 300             layersChanged();
 301         }
 302         @Override
 303         public void layerDeactivated(ILayer layer) {
 304             layersChanged();
 305         }
 306         @Override
 307         public void layerAdded(ILayer layer) {
 308             layersChanged();
 309         }
 310         @Override
 311         public void layerActivated(ILayer layer) {
 312             layersChanged();
 313         }
 314         @Override
 315         public void ignoreFocusChanged(boolean value) {
 316                 ICanvasContext ctx = getContext();
 317                 if(ctx == null) return;
 318                 G2DSceneGraph sg = ctx.getSceneGraph();
 319                 if(sg == null) return;
 320                 sg.setGlobalProperty(G2DSceneGraph.IGNORE_FOCUS, value);
 321         }
 322         @Override
 323         public void ignoreVisibilityChanged(boolean value) {
 324             layersChanged();
 325         }
 326     };
 327
 328     protected void updateAllVisibility() {
 329         // TODO: optimize, no node reinitialization
 330         updateAll();
 331     }
 332
 333     // ------------------------------------------------------------------------
 334     // Layer configuration change listening and reaction logic
 335     // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
 336
 337
 338     // <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
 339     // Diagram/Element hint listeners
 340     // ------------------------------------------------------------------------
 341
 342     class DiagramHintListener extends HintListenerAdapter {
 343         @Override
 344         public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
 345             if (key == Hints.KEY_DISABLE_PAINTING) {
 346                 if (diagramParent != null) {
 347                     diagramParent.setVisible(!Boolean.TRUE.equals(newValue));
 348                 }
 349             } else if (key == Hints.KEY_DIRTY) {
 350                 if (newValue == Hints.VALUE_Z_ORDER_CHANGED) {
 351                     diagram.removeHint(Hints.KEY_DIRTY);
 352
 353                     if (DEBUG)
 354                         System.out.println("Diagram z-order changed: " + diagram);
 355
 356                     updateZOrder(diagram, ElementHints.KEY_SG_NODE);
 357                 }
 358             }
 359         }
 360     };
 361
 362     private final DiagramHintListener diagramHintListener = new DiagramHintListener();
 363
 364     /**
 365      * This element hint listener tries to ensure that diagram elements and the
 366      * normal diagram scene graph stay in sync by listening to any changes
 367      * occurring in elements, i.e. in their hints.
 368      *
 369      * It does this by listening to {@link Hints#KEY_DIRTY} hint changes.
 370      *
 371      * @author Tuukka Lehtonen
 372      */
 373     class ElementHintListener implements IHintListener {
 374         @Override
 375         public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
 376             if (key == Hints.KEY_DIRTY) {
 377                 if (newValue == Hints.VALUE_SG_DIRTY) {
 378                     if (sender instanceof IElement) {
 379                         assert getContext().getThreadAccess().currentThreadAccess();
 380                         Object task = BEGIN("element dirty");
 381
 382                         IElement e = (IElement) sender;
 383                         e.removeHint(Hints.KEY_DIRTY);
 384
 385                         if (DEBUG)
 386                             System.out.println("Element is dirty: " + e);
 387
 388                         updateSelfAndNeighbors(e, COMPLETE_UPDATE);
 389                         END(task);
 390                     }
 391                 }
 392             } else if (key == ElementHints.KEY_FOCUS_LAYERS || key == ElementHints.KEY_VISIBLE_LAYERS) {
 393                 if (sender instanceof IElement) {
 394                     assert getContext().getThreadAccess().currentThreadAccess();
 395                     IElement e = (IElement) sender;
 396                     Object task = BEGIN("layers changed: " + e);
 397                     update(e);
 398                     END(task);
 399                 }
 400             }
 401         }
 402
 403         @Override
 404         public void hintRemoved(IHintObservable sender, Key key, Object oldValue) {
 405         }
 406     }
 407
 408     private final ElementHintListener elementHintListener = new ElementHintListener();
 409
 410     private final Set<Transaction> activeTransactions = new HashSet<Transaction>();
 411
 412     @Override
 413     public void transactionStarted(IDiagram d, Transaction t) {
 414         activeTransactions.add(t);
 415     }
 416
 417     Consumer<IElement> COMPLETE_UPDATE = element -> {
 418         // Connections may need rerouting
 419         if (element.getElementClass().containsClass(ConnectionHandler.class))
 420             DiagramUtils.validateAndFix(diagram, Collections.singleton(element));
 421
 422         //System.out.println("COMPLETE_UPDATE(" + element + ")");
 423         update(element);
 424         updateSelection(element);
 425     };
 426
 427     Set<IElement> addRelatedElements(Set<IElement> elements) {
 428         RelationshipHandler rh = diagram.getDiagramClass().getAtMostOneItemOfClass(RelationshipHandler.class);
 429         if (rh != null) {
 430             relatedElements.clear();
 431             for (IElement el : elements) {
 432                 relations.clear();
 433                 rh.getRelations(diagram, el, relations);
 434                 for (Relation r : relations) {
 435                     Object obj = r.getObject();
 436                     if (obj instanceof IElement) {
 437                         relatedElements.add((IElement) obj);
 438                     }
 439                 }
 440                 relations.clear();
 441             }
 442             elements.addAll(relatedElements);
 443             relatedElements.clear();
 444         }
 445         return elements;
 446     }
 447
 448     /**
 449      * @param e
 450      * @param updateCallback
 451      */
 452     protected void updateSelfAndNeighbors(IElement e, Consumer<IElement> updateCallback) {
 453         // Slight optimization for cases that are known to be topologically
 454         // non-expandable.
 455         if (!isNotSelectionExpandable(e)) {
 456             Set<IElement> single = Collections.singleton(e);
 457
 458             Set<IElement> expanded =
 459                 // Also update all elements somehow related to e.
 460                 addRelatedElements(
 461                         // Get all topological neighbors and element self.
 462                         CollectionUtils.join(
 463                                 single,
 464                                 TopologicalSelectionExpander.expandSelection(diagram, single)
 465                         )
 466                 );
 467             // Perform the updates.
 468             for (IElement el : expanded) {
 469                 updateCallback.accept(el);
 470             }
 471         } else {
 472             updateCallback.accept(e);
 473         }
 474     }
 475
 476     /**
 477      * @param e
 478      * @return
 479      */
 480     protected boolean isNotSelectionExpandable(IElement e) {
 481         ElementClass ec = e.getElementClass();
 482         return !ec.containsClass(ConnectionHandler.class)
 483         && !ec.containsClass(BendsHandler.class)
 484         && !ec.containsClass(TerminalTopology.class);
 485     }
 486
 487     @Override
 488     public void transactionFinished(IDiagram d, Transaction t) {
 489         activeTransactions.remove(t);
 490     }
 491
 492     boolean inDiagramTransaction() {
 493         return !activeTransactions.isEmpty();
 494     }
 495
 496     @Override
 497     public void onElementAdded(IDiagram d, IElement e) {
 498         if (DEBUG)
 499             System.out.println("EP.onElementAdded(" + d + ", " + e + ")");
 500
 501         if (inDiagramTransaction()) {
 502             addElement(e, false);
 503         } else {
 504             addElement(e, true);
 505         }
 506     }
 507     @Override
 508     public void onElementRemoved(IDiagram d, IElement e) {
 509         if (DEBUG)
 510             System.out.println("EP.onElementRemoved(" + d + ", " + e + ")");
 511
 512         removeElement(e);
 513     }
 514
 515     @Override
 516     public void elementChildrenChanged(ChildEvent event) {
 517         if (DEBUG)
 518             System.out.println("EP.elementChildrenChanged: " + event);
 519
 520         for (IElement removed : event.removed) {
 521             removeElement(removed);
 522         }
 523         for (IElement added : event.added) {
 524             addElement(added, false);
 525         }
 526     }
 527
 528     private final List<IElement> childrenTemp = new ArrayList<IElement>();
 529
 530     public void addElement(IElement e, boolean synchronizeSceneGraphNow) {
 531         if (DEBUG)
 532             System.out.println("EP.addElement(now=" + synchronizeSceneGraphNow + ", " + e + ")");
 533
 534         e.addKeyHintListener(Hints.KEY_DIRTY, elementHintListener);
 535         e.addKeyHintListener(ElementHints.KEY_VISIBLE_LAYERS, elementHintListener);
 536         e.addKeyHintListener(ElementHints.KEY_FOCUS_LAYERS, elementHintListener);
 537
 538         ElementClass clazz = e.getElementClass();
 539         G2DParentNode parentNode = elementParent;
 540         Key sgKey = ElementHints.KEY_SG_NODE;
 541
 542         Parent parent = clazz.getAtMostOneItemOfClass(Parent.class);
 543         if (parent != null) {
 544             IElement parentElement = parent.getParent(e);
 545             if (parentElement != null) {
 546                 SingleElementNode parentHolder = parentElement.getHint(sgKey);
 547                 if (parentHolder != null) {
 548                     parentNode = parentHolder;
 549                 }
 550             }
 551         }
 552
 553         boolean isConnection = e.getElementClass().containsClass(ConnectionHandler.class);
 554
 555         if(isConnection) {
 556
 557             ConnectionNode holder = e.getHint(sgKey);
 558             if (holder == null) {
 559                 holder = parentNode.addNode(ElementUtils.generateNodeId(e), ConnectionNode.class);
 560                 holder.setKey(e.getHint(ElementHints.KEY_OBJECT));
 561                 holder.setTransferableProvider(new ElementTransferableProvider(getContext(), e));
 562                 e.setHint(sgKey, holder);
 563                 holder.setZIndex(parentNode.getNodeCount() + 1);
 564             }
 565
 566         } else {
 567
 568             SingleElementNode holder = e.getHint(sgKey);
 569             if (holder == null) {
 570                 holder = parentNode.addNode(ElementUtils.generateNodeId(e), SingleElementNode.class);
 571                 holder.setKey(e.getHint(ElementHints.KEY_OBJECT));
 572                 holder.setTransferableProvider(new ElementTransferableProvider(getContext(), e));
 573                 e.setHint(sgKey, holder);
 574                 holder.setZIndex(parentNode.getNodeCount() + 1);
 575             }
 576
 577         }
 578
 579         Children children = clazz.getAtMostOneItemOfClass(Children.class);
 580         if (children != null) {
 581             children.addChildListener(e, this);
 582
 583             childrenTemp.clear();
 584             children.getChildren(e, childrenTemp);
 585             //System.out.println("children: " + childrenTemp);
 586             for (IElement child : childrenTemp) {
 587                 addElement(child, false);
 588             }
 589             childrenTemp.clear();
 590         }
 591
 592         if (synchronizeSceneGraphNow)
 593             updateElement(e, sgKey);
 594
 595         //setTreeDirty();
 596     }
 597
 598     protected void removeElement(IElement e) {
 599         if (DEBUG)
 600             System.out.println("EP.removeElement(" + e + ")");
 601
 602         e.removeKeyHintListener(Hints.KEY_DIRTY, elementHintListener);
 603         e.removeKeyHintListener(ElementHints.KEY_VISIBLE_LAYERS, elementHintListener);
 604         e.removeKeyHintListener(ElementHints.KEY_FOCUS_LAYERS, elementHintListener);
 605
 606         ElementClass clazz = e.getElementClass();
 607         if (clazz.containsClass(Children.class)) {
 608             Children children = clazz.getSingleItem(Children.class);
 609             children.removeChildListener(e, this);
 610         }
 611
 612         List<SceneGraph> nodeHandlers = e.getElementClass().getItemsByClass(SceneGraph.class);
 613         for (SceneGraph n : nodeHandlers) {
 614             n.cleanup(e);
 615         }
 616
 617         // Remove all hints related to scene graph nodes to prevent leakage of
 618         // scene graph resources.
 619         Map<SceneGraphNodeKey, Object> sgHints = e.getHintsOfClass(SceneGraphNodeKey.class);
 620         for (SceneGraphNodeKey sgKey : sgHints.keySet()) {
 621             Node n = e.removeHint(sgKey);
 622             if (n != null) {
 623                 n.remove();
 624             }
 625         }
 626
 627         //setTreeDirty();
 628     }
 629
 630     /**
 631      * Invalidate the whole scene graph spatial structure. It will be rebuilt by
 632      * RTreeNode when needed the next time.
 633      */
 634     private void setTreeDirty() {
 635         elementParent.setDirty();
 636     }
 637
 638     /**
 639      * Mark the specified node invalid with respect to the scene graph spatial
 640      * structure.
 641      *
 642      * @param node a scene graph node that has somehow changed
 643      */
 644     private void invalidateNode(INode node) {
 645         // TODO: optimize rtree updates instead of killing the whole tree
 646         elementParent.setDirty();
 647     }
 648
 649     // ------------------------------------------------------------------------
 650     // Diagram/Element hint listeners
 651     // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
 652
 653     public void updateAll() {
 654         if (DEBUG)
 655             System.out.println("EP.updateAll()");
 656
 657         Object task = BEGIN("EP.updateAll");
 658         paintDiagram(elementParent, diagram, null);
 659         updateSelections();
 660         setTreeDirty();
 661         END(task);
 662     }
 663
 664     public void update(IElement element) {
 665         updateElement(element, ElementHints.KEY_SG_NODE);
 666     }
 667
 668     /**
 669      *
 670      * @param controlGC
 671      * @param diagram
 672      * @param elementsToPaint
 673      *            elements to paint or null for all elements
 674      */
 675     public void paintDiagram(G2DParentNode parent, IDiagram diagram, Collection<IElement> elementsToPaint) {
 676         Object task = BEGIN("EP.paintDiagram");
 677         paintDiagram(parent, diagram, elementsToPaint, ElementHints.KEY_SG_NODE);
 678         END(task);
 679     }
 680
 681     /**
 682      *
 683      * @param controlGC
 684      * @param diagram
 685      * @param elementsToPaint
 686      *            elements to paint or null for all elements
 687      */
 688     public void paintDiagram(G2DParentNode parent, IDiagram diagram, Collection<IElement> elementsToPaint, Key elementSgNodeKey) {
 689         if(diagram == null) return;
 690         ICanvasContext ctx = getContext();
 691         assert (ctx != null);
 692
 693         Boolean disablePaint = diagram.getHint(Hints.KEY_DISABLE_PAINTING);
 694         if (Boolean.TRUE.equals(disablePaint)) {
 695             parent.removeNodes();
 696             return;
 697         }
 698
 699         // Paint elementsToPaint in correct z-order from diagram.getElements()
 700         List<IElement> elements = diagram.getSnapshot();
 701
 702         Set<SingleElementNode> tmp = new HashSet<SingleElementNode>();
 703         int zIndex = 0;
 704         for (int pass = 0; pass < 1; ++pass) {
 705             for (IElement e : elements) {
 706                 if (elements != elementsToPaint && elementsToPaint != null)
 707                     if (!elementsToPaint.contains(e))
 708                         continue;
 709
 710                 if (DEBUG)
 711                     System.out.println("EP.paintDiagram(" + zIndex + ", " + e + ")");
 712
 713                 SingleElementNode holder = updateElement(parent, e, elementSgNodeKey, false);
 714                 if (holder != null) {
 715                     tmp.add(holder);
 716                     holder.setZIndex(++zIndex);
 717                 }
 718             }
 719         }
 720
 721         // Hide unaccessed nodes (but don't remove)
 722         for (IG2DNode node : parent.getNodes()) {
 723             if (!tmp.contains(node)) {
 724                 ((SingleElementNode)node).setVisible(false);
 725             }
 726         }
 727     }
 728
 729     public void updateElement(IElement e, Key elementSgNodeKey) {
 730         updateElement(null, e, elementSgNodeKey, true);
 731     }
 732
 733     /**
 734      * @param parent if <code>null</code> the scene graph node structure
 735      *        will not be created if it is missing
 736      * @param e
 737      * @param elementSgNodeKey
 738      * @param invalidateNode
 739      */
 740     public SingleElementNode updateElement(G2DParentNode parent, IElement e, Key elementSgNodeKey, boolean invalidateNode) {
 741         if (DEBUG)
 742             System.out.println("EP.updateElement(" + e + ", " + elementSgNodeKey + ")");
 743         Object task = BEGIN("EP.updateElement");
 744
 745         try {
 746             SingleElementNode holder = e.getHint(elementSgNodeKey);
 747             if (holder == null && parent == null)
 748                 return null;
 749
 750             if (ElementUtils.isHidden(e))
 751                 return null;
 752
 753 //            ElementClass ec = e.getElementClass();
 754 //            ILayers layers = diagram.getHint(DiagramHints.KEY_LAYERS);
 755 //            if (layers != null && !layers.getIgnoreVisibilitySettings()) {
 756 //                ElementLayers el = ec.getAtMostOneItemOfClass(ElementLayers.class);
 757 //                if (el != null && !el.isVisible(e, layers)) {
 758 //                    return null;
 759 //                }
 760 //            }
 761
 762             // Update the node scene graph through SceneGraph handlers.
 763             List<SceneGraph> nodeHandlers = e.getElementClass().getItemsByClass(SceneGraph.class);
 764             Collection<SceneGraph> decorators = e.getHint(ElementHints.KEY_DECORATORS);
 765             if (nodeHandlers.isEmpty() && (decorators == null || decorators.isEmpty()))
 766                 return null;
 767
 768             Composite composite = e.getHint(ElementHints.KEY_COMPOSITE);
 769
 770             if (holder == null) {
 771                 holder = parent.addNode(ElementUtils.generateNodeId(e), SingleElementNode.class);
 772                 e.setHint(elementSgNodeKey, holder);
 773             }
 774             holder.setComposite(composite);
 775             holder.setVisible(true);
 776
 777             for (SceneGraph n : nodeHandlers) {
 778                 n.init(e, holder);
 779             }
 780
 781             // Process decorators
 782             if (decorators == null || decorators.isEmpty()) {
 783                 holder.removeNode("decorators");
 784             } else {
 785                 G2DParentNode decoratorHolder = holder.getOrCreateNode("decorators", G2DParentNode.class);
 786                 decoratorHolder.removeNodes();
 787                 for (SceneGraph decorator : decorators) {
 788                     decorator.init(e, decoratorHolder);
 789                 }
 790             }
 791
 792             if (invalidateNode)
 793                 invalidateNode(holder);
 794
 795             return holder;
 796         } finally {
 797             END(task);
 798         }
 799     }
 800
 801     /**
 802      * @param elementsToUpdate to explicitly specify which elements to update
 803      *        the selection scene graph for, or <code>null</code> to update
 804      *        everything
 805      */
 806     public void updateSelections() {
 807         Object task = BEGIN("EP.updateSelections");
 808
 809         try {
 810             if (!paintSelectionFrames)
 811                 return;
 812             if (selection == null)
 813                 return;
 814
 815             boolean selectionsChanged = false;
 816
 817             // Update and "touch" all selections.
 818             Set<Integer> existingSelections = new HashSet<Integer>();
 819             Set<INode> selectionNodes = new HashSet<INode>();
 820             Set<INode> tmp = new HashSet<INode>();
 821             Map<INode, LinkNode> selectionLinks = new HashMap<INode, LinkNode>();
 822
 823             for (Map.Entry<Integer, Set<IElement>> entry : selection.getSelections().entrySet()) {
 824                 Integer selectionId = entry.getKey();
 825                 Set<IElement> selectedElements = entry.getValue();
 826
 827                 existingSelections.add(selectionId);
 828
 829 //                System.out.println("SELECTION[" + selectionId + "]: " + selectedElements);
 830                 ElementNodeBridge bridge = getOrCreateSelectionMap(selectionId);
 831                 selectionNodes.clear();
 832                 selectionsChanged |= paintSelection(selectedElements, selectionId, selectionNodes, bridge);
 833
 834                 // Remove selection nodes that were not referenced during the update.
 835 //                System.out.println("BRIDGE: " + bridge.toString());
 836 //                System.out.println("SELECTED: " + selectionNodes);
 837                 tmp.clear();
 838                 tmp.addAll(bridge.getRightSet());
 839                 tmp.removeAll(selectionNodes);
 840 //                System.out.println("REMOVED: " + tmp);
 841 //                System.out.println("BRIDGE BEFORE: " + bridge);
 842                 selectionsChanged |= bridge.retainAllRight(selectionNodes);
 843 //                System.out.println("BRIDGE AFTER: " + bridge);
 844
 845                 G2DParentNode selectionsNode = getSelectionsNode(selectionId);
 846                 selectionLinks.clear();
 847                 getSelectedNodeReferences(selectionsNode, selectionLinks);
 848
 849                 for (INode node : tmp) {
 850                     INode linkNode = selectionLinks.get(node.getParent());
 851                     if (linkNode != null) {
 852                         linkNode.remove();
 853                     }
 854 //                    System.out.println("REMOVED SELECTION: -> " + node);
 855                     node.remove();
 856                 }
 857             }
 858
 859             for (Iterator<Map.Entry<Integer, ElementNodeBridge>> iterator = selections.entrySet().iterator(); iterator.hasNext();) {
 860                 Map.Entry<Integer, ElementNodeBridge> entry = iterator.next();
 861                 Integer selectionId = entry.getKey();
 862                 if (!existingSelections.contains(selectionId)) {
 863                     // Selection no longer exists.
 864                     selectionsChanged = true;
 865                     for (INode node : entry.getValue().getRightSet()) {
 866 //                        System.out.println("REMOVED SELECTION: " + node);
 867                         node.remove();
 868                     }
 869                     iterator.remove();
 870
 871                     G2DParentNode selectionsNode = getSelectionsNode(selectionId);
 872                     selectionsNode.removeNodes();
 873                 }
 874             }
 875
 876             // Make sure the view is refreshed after selection changes.
 877             if (selectionsChanged) {
 878                 setDirty();
 879             }
 880         } finally {
 881             END(task);
 882         }
 883     }
 884
 885     private G2DParentNode getSelectionsNode() {
 886         G2DParentNode sels = NodeUtil.lookup(diagramParent, SceneGraphConstants.SELECTIONS_NODE_NAME, G2DParentNode.class);
 887         if (sels == null) {
 888             DataNode data= NodeUtil.lookup(diagramParent, SceneGraphConstants.DATA_NODE_NAME, DataNode.class);
 889             sels = data.addNode(SceneGraphConstants.SELECTIONS_NODE_NAME, G2DParentNode.class);
 890             sels.setLookupId(SceneGraphConstants.SELECTIONS_NODE_NAME);
 891         }
 892         return sels;
 893     }
 894
 895     private G2DParentNode getSelectionsNode(int selectionId) {
 896         G2DParentNode selectionsNode = getSelectionsNode();
 897         G2DParentNode s = selectionsNode.getOrCreateNode(String.valueOf(selectionId), G2DParentNode.class);
 898         return s;
 899     }
 900
 901     private Map<INode, LinkNode> getSelectedNodeReferences(G2DParentNode selectionsNode, Map<INode, LinkNode> result) {
 902         for (IG2DNode node : selectionsNode.getSortedNodes()) {
 903             if (node instanceof LinkNode) {
 904                 INode n = ((LinkNode) node).getDelegate();
 905                 if (n != null)
 906                     result.put(n, (LinkNode) node);
 907             }
 908         }
 909         return result;
 910     }
 911
 912     public void updateSelection(IElement el) {
 913         Object task = BEGIN("EP.updateSelection");
 914
 915         try {
 916             if (!paintSelectionFrames)
 917                 return;
 918
 919             G2DParentNode elementNode = (G2DParentNode) el.getHint(ElementHints.KEY_SG_NODE);
 920             if (elementNode == null)
 921                 return;
 922
 923             boolean nodesUpdated = false;
 924
 925             for (Map.Entry<Integer, ElementNodeBridge> entry : selections.entrySet()) {
 926                 Integer selectionId = entry.getKey();
 927                 ElementNodeBridge bridge = entry.getValue();
 928                 Color color = getSelectionColor(selectionId);
 929
 930                 G2DParentNode selectionNode = (G2DParentNode) bridge.getRight(el);
 931                 if (selectionNode == null)
 932                     continue;
 933
 934                 if (NodeUtil.needSelectionPaint(elementNode))
 935                     paintSelectionFrame(elementNode, selectionNode, el, color);
 936
 937                 nodesUpdated = true;
 938             }
 939
 940             // Make sure the view is refreshed after selection changes.
 941             if (nodesUpdated)
 942                 setDirty();
 943         } finally {
 944             END(task);
 945         }
 946     }
 947
 948     /**
 949      * @param selection
 950      * @param selectionId
 951      * @param selectionNodes for collecting all the "selection" nodes created or
 952      *        referenced by this method
 953      * @param bridge
 954      * @return
 955      */
 956     public boolean paintSelection(Set<IElement> selection, int selectionId, Set<INode> selectionNodes, ElementNodeBridge bridge) {
 957
 958         boolean result = false;
 959         Color color = getSelectionColor(selectionId);
 960         G2DParentNode selectionsNode = getSelectionsNode(selectionId);
 961
 962         for (IElement e : selection) {
 963             Node elementNode = e.getHint(ElementHints.KEY_SG_NODE);
 964 //            System.out.println("selectionNode: " + elementNode + " " + e);
 965             if (elementNode instanceof G2DParentNode) {
 966                 G2DParentNode en = (G2DParentNode) elementNode;
 967                 G2DParentNode selectionNode = en.getOrCreateNode(NodeUtil.SELECTION_NODE_NAME, G2DParentNode.class);
 968                 selectionNode.setZIndex(SELECTION_PAINT_PRIORITY);
 969                 if (selectionNodes != null)
 970                     selectionNodes.add(selectionNode);
 971                 if (!bridge.containsLeft(e)) {
 972                     //System.out.println("ADDED SELECTION: " + e + " -> " + selectionNode);
 973                     bridge.map(e, selectionNode);
 974                     result = true;
 975                 }
 976
 977                 // Mark this node selected in the scene graph "data area"
 978                 createSelectionReference(selectionsNode, elementNode);
 979
 980                 if (NodeUtil.needSelectionPaint(elementNode))
 981                     paintSelectionFrame(en, selectionNode, e, color);
 982
 983             } else {
 984                 if (elementNode != null) {
 985                     // Cannot paint selection for unrecognized non-parenting node
 986                     System.out.println("Cannot add selection child node for non-parent element node: " + elementNode);
 987                 }
 988             }
 989         }
 990
 991 //        if (selection.isEmpty()) {
 992 //            Node pivotNode = (Node) parent.getNode("pivot");
 993 //            if (pivotNode != null)
 994 //                pivotNode.remove();
 995 //        } else {
 996 //            Point2D pivot = ElementUtils.getElementBoundsCenter(selection, pivotPoint);
 997 //            if (pivot != null) {
 998 //                //System.out.println("painting pivot: " + pivot);
 999 //                SelectionPivotNode pivotNode = parent.getOrCreateNode("pivot", SelectionPivotNode.class);
1000 //                pivotNode.setPivot(pivot);
1001 //            } else {
1002 //                parent.removeNode("pivot");
1003 //            }
1004 //        }
1005
1006         return result;
1007     }
1008
1009     public void paintSelectionFrame(G2DParentNode elementNode, G2DParentNode selectionNode, final IElement e, Color color) {
1010         // The element node already has the correct transform.
1011         AffineTransform selectionTransform = ElementUtils.getTransform(e);// no it doesnt ... new AffineTransform();
1012         Shape shape = ElementUtils.getElementShapeOrBounds(e);
1013         Rectangle2D bounds = shape.getBounds2D();
1014         //System.out.println("selection bounds: "+bounds);
1015         final double marginX = 1 / selectionTransform.getScaleX();
1016         final double marginY = 1 / selectionTransform.getScaleY();
1017         bounds.setFrame(bounds.getMinX() - marginX, bounds.getMinY() - marginY, bounds.getWidth() + 2*marginX, bounds.getHeight() + 2*marginY);
1018
1019         List<SelectionSpecification> ss = e.getElementClass().getItemsByClass(SelectionSpecification.class);
1020         if (!ss.isEmpty()) {
1021             G2DParentNode shapeholder = selectionNode.getOrCreateNode(getNodeId("outlines", e), G2DParentNode.class);
1022
1023             for (SelectionSpecification es : ss) {
1024                 Outline outline = (Outline) es.getAdapter(Outline.class);
1025                 if (outline == null || outline.getElementShape(e) == null)
1026                         continue;
1027                 ShapeNode shapenode = shapeholder.getOrCreateNode(getNodeId("outline", e, es), ShapeNode.class);
1028 //                shapenode.setShape(es.getSelectionShape(e));
1029 //                shapenode.setStroke(SELECTION_STROKE);
1030 //                shapenode.setScaleStroke(true);
1031 //                shapenode.setColor(color);
1032 //                shapenode.setTransform(selectionTransform);
1033 //                shapenode.setFill(false);
1034                 shapenode.setShape(outline.getElementShape(e));
1035                 StrokeSpec strokeSpec = (StrokeSpec) es.getAdapter(StrokeSpec.class);
1036                 if (strokeSpec != null && strokeSpec.getStroke(e) != null)
1037                         shapenode.setStroke(strokeSpec.getStroke(e));
1038
1039                 shapenode.setScaleStroke(false);
1040                 //shapenode.setColor(color);
1041                 OutlineColorSpec foregroundColor = (OutlineColorSpec) es.getAdapter(OutlineColorSpec.class);
1042                 if (foregroundColor != null && foregroundColor.getColor(e) != null)
1043                         shapenode.setColor(foregroundColor.getColor(e));
1044
1045                 Transform transform = (Transform) es.getAdapter(Transform.class);
1046                 if (transform != null && transform.getTransform(e) != null)
1047                         shapenode.setTransform(transform.getTransform(e));
1048
1049                 shapenode.setFill(false);
1050                 FillColor fillColor = (FillColor) es.getAdapter(FillColor.class);
1051                 if (fillColor != null && fillColor.getFillColor(e) != null)
1052                     shapenode.setFill(true);
1053 //                      shapenode.setColor(ColorUtil.withAlpha(backgroundColor.getColor(e), 192));
1054             }
1055             return;
1056         }
1057
1058         List<SelectionOutline> shapeHandlers = e.getElementClass().getItemsByClass(SelectionOutline.class);
1059         if (!shapeHandlers.isEmpty()) {
1060             G2DParentNode shapeholder = selectionNode.getOrCreateNode(getNodeId("outlines", e), G2DParentNode.class);
1061
1062             for (SelectionOutline es : shapeHandlers) {
1063                 ShapeNode shapenode = shapeholder.getOrCreateNode(getNodeId("outline", e, es), ShapeNode.class);
1064 //                shapenode.setShape(es.getSelectionShape(e));
1065 //                shapenode.setStroke(SELECTION_STROKE);
1066 //                shapenode.setScaleStroke(true);
1067 //                shapenode.setColor(color);
1068 //                shapenode.setTransform(selectionTransform);
1069 //                shapenode.setFill(false);
1070                 shapenode.setShape(es.getSelectionShape(e));
1071                 shapenode.setStroke(null);
1072                 shapenode.setScaleStroke(false);
1073                 //shapenode.setColor(color);
1074                 shapenode.setColor(ColorUtil.withAlpha(color, 192));
1075                 shapenode.setTransform(selectionTransform);
1076                 shapenode.setFill(true);
1077             }
1078             return;
1079         }
1080
1081         ISelectionProvider provider = this.getContext().getDefaultHintContext().getHint(KEY_SELECTION_PROVIDER);
1082         if (provider != null) {
1083             provider.init(e, selectionNode, getNodeId("shape", e), selectionTransform, bounds, color);
1084         } else {
1085             SelectionNode s = selectionNode.getOrCreateNode(getNodeId("shape", e), SelectionNode.class);
1086             s.init(selectionTransform, bounds, color);
1087         }
1088     }
1089
1090     private void createSelectionReference(G2DParentNode selectionsNode, INode elementNode) {
1091         String id = NodeUtil.lookupId(elementNode);
1092         String uuid = null;
1093         if (id == null)
1094             id = uuid = UUID.randomUUID().toString();
1095         NodeUtil.map(elementNode, id);
1096         LinkNode link = selectionsNode.getOrCreateNode(id, LinkNode.class);
1097         link.setDelegateId(id);
1098         link.setIgnoreDelegate(true);
1099         link.setLookupIdOwner(uuid != null);
1100     }
1101
1102     private transient CharBuffer buf = CharBuffer.allocate(32);
1103
1104     private String getNodeId(String prefix, Object first) {
1105         return getNodeId(prefix, first, null);
1106     }
1107
1108     private String getNodeId(String prefix, Object first, Object second) {
1109         buf.clear();
1110         if (prefix != null)
1111             buf.append(prefix);
1112         if (first != null) {
1113             buf.append('_');
1114             buf.append("" + first.hashCode());
1115         }
1116         if (second != null) {
1117             buf.append('_');
1118             buf.append("" + second.hashCode());
1119         }
1120         buf.limit(buf.position());
1121         buf.rewind();
1122         //System.out.println("node id: " + buf.toString());
1123         return buf.toString();
1124     }
1125
1126     /**
1127      * Get selection color for a selection Id
1128      * @param selectionId selection id
1129      * @return color for the id
1130      */
1131     protected Color getSelectionColor(int selectionId) {
1132         if (selectionId == 0) {
1133             Color c = getHint(KEY_SELECTION_FRAME_COLOR);
1134             if (c != null)
1135                 return c;
1136             return Color.BLACK;
1137         }
1138         Color c = selectionColor.get(selectionId);
1139         if (c == null) {
1140             Random r = new Random(selectionId);
1141             c = new Color(r.nextFloat(), r.nextFloat(), r.nextFloat());
1142             selectionColor.put(selectionId, c);
1143         }
1144         return c;
1145     }
1146
1147     private transient ConcurrentMap<Integer, ElementNodeBridge> selections = new ConcurrentHashMap<Integer, ElementNodeBridge>();
1148
1149     ElementNodeBridge getSelectionMap(int selectionId) {
1150         return selections.get(Integer.valueOf(selectionId));
1151     }
1152
1153     ElementNodeBridge getOrCreateSelectionMap(int selectionId) {
1154         Integer id = Integer.valueOf(selectionId);
1155         synchronized (selections) {
1156             ElementNodeBridge map = selections.get(id);
1157             if (map != null)
1158                 return map;
1159
1160             selections.put(id, map = new ElementNodeBridge(id));
1161             return map;
1162         }
1163     }
1164
1165     private transient Map<Integer, Color>     selectionColor              = new HashMap<Integer, Color>();
1166
1167     private transient BasicStroke             SELECTION_STROKE            = new BasicStroke(1.0f, BasicStroke.CAP_BUTT,
1168             BasicStroke.JOIN_BEVEL, 10.0f,
1169             new float[] { 5.0f, 5.0f }, 0.0f);
1170
1171     private transient Point2D                 pivotPoint                  = new Point2D.Double();
1172
1173     @HintListener(Class=Selection.class, Field="SELECTION0")
1174     public void selectionChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
1175         //System.out.println("new selection: " + newValue);
1176         updateSelections();
1177     }
1178
1179     @HintListener(Class=Selection.class, Field="SELECTION0")
1180     public void selectionRemoved(IHintObservable sender, Key key, Object oldValue) {
1181         //System.out.println("selection removed: " + oldValue);
1182         updateSelections();
1183     }
1184
1185     private static Object BEGIN(String name) {
1186         if (DEBUG) {
1187             //return ThreadLog.BEGIN(name);
1188         }
1189         return null;
1190     }
1191
1192     private static void END(Object task) {
1193         if (DEBUG) {
1194             //((Task) task).end();
1195         }
1196     }
1197
1198 }