bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/widgets/GraphExplorerComposite.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2012 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.browsing.ui.swt.widgets;
  13
  14 import java.util.Collection;
  15 import java.util.Collections;
  16 import java.util.HashSet;
  17 import java.util.Map;
  18 import java.util.Set;
  19 import java.util.function.BiFunction;
  20 import java.util.function.Consumer;
  21
  22 import org.eclipse.core.runtime.IAdaptable;
  23 import org.eclipse.core.runtime.Platform;
  24 import org.eclipse.jface.action.IMenuManager;
  25 import org.eclipse.jface.layout.GridDataFactory;
  26 import org.eclipse.jface.layout.GridLayoutFactory;
  27 import org.eclipse.jface.layout.TreeColumnLayout;
  28 import org.eclipse.jface.resource.JFaceResources;
  29 import org.eclipse.jface.resource.LocalResourceManager;
  30 import org.eclipse.jface.viewers.ColumnWeightData;
  31 import org.eclipse.jface.viewers.ISelectionProvider;
  32 import org.eclipse.swt.SWT;
  33 import org.eclipse.swt.dnd.DND;
  34 import org.eclipse.swt.dnd.DragSource;
  35 import org.eclipse.swt.dnd.DragSourceEvent;
  36 import org.eclipse.swt.dnd.DragSourceListener;
  37 import org.eclipse.swt.dnd.DropTarget;
  38 import org.eclipse.swt.dnd.DropTargetEvent;
  39 import org.eclipse.swt.dnd.DropTargetListener;
  40 import org.eclipse.swt.dnd.FileTransfer;
  41 import org.eclipse.swt.dnd.TextTransfer;
  42 import org.eclipse.swt.dnd.Transfer;
  43 import org.eclipse.swt.widgets.Composite;
  44 import org.eclipse.swt.widgets.Control;
  45 import org.eclipse.swt.widgets.Event;
  46 import org.eclipse.swt.widgets.Listener;
  47 import org.eclipse.swt.widgets.Tree;
  48 import org.eclipse.swt.widgets.TreeColumn;
  49 import org.eclipse.swt.widgets.TreeItem;
  50 import org.eclipse.ui.ISelectionListener;
  51 import org.eclipse.ui.IWorkbenchSite;
  52 import org.eclipse.ui.contexts.IContextService;
  53 import org.simantics.browsing.ui.BuiltinKeys;
  54 import org.simantics.browsing.ui.Column;
  55 import org.simantics.browsing.ui.ExplorerState;
  56 import org.simantics.browsing.ui.GraphExplorer;
  57 import org.simantics.browsing.ui.GraphExplorer.TransientExplorerState;
  58 import org.simantics.browsing.ui.NodeContext;
  59 import org.simantics.browsing.ui.StatePersistor;
  60 import org.simantics.browsing.ui.common.ColumnKeys;
  61 import org.simantics.browsing.ui.common.EvaluatorData;
  62 import org.simantics.browsing.ui.common.EvaluatorDataImpl;
  63 import org.simantics.browsing.ui.common.processors.ComparableFactoryResolver;
  64 import org.simantics.browsing.ui.common.processors.ComparableSelectorQueryProcessor;
  65 import org.simantics.browsing.ui.common.processors.FilterSelectionRequestQueryProcessor;
  66 import org.simantics.browsing.ui.common.processors.ImageDecoratorFactoryResolver;
  67 import org.simantics.browsing.ui.common.processors.ImagerFactoryResolver;
  68 import org.simantics.browsing.ui.common.processors.LabelDecoratorFactoryResolver;
  69 import org.simantics.browsing.ui.common.processors.LabelerFactoryResolver;
  70 import org.simantics.browsing.ui.common.processors.UserSelectedComparableFactoryQueryProcessor;
  71 import org.simantics.browsing.ui.common.processors.UserSelectedViewpointFactoryQueryProcessor;
  72 import org.simantics.browsing.ui.common.processors.ViewpointFactoryResolver;
  73 import org.simantics.browsing.ui.common.views.FilterAreaSource;
  74 import org.simantics.browsing.ui.common.views.IFilterArea;
  75 import org.simantics.browsing.ui.common.views.IFilterAreaProvider;
  76 import org.simantics.browsing.ui.graph.impl.AsyncReadGraphDataSource;
  77 import org.simantics.browsing.ui.graph.impl.Evaluators;
  78 import org.simantics.browsing.ui.graph.impl.InheritsQueryProcessor;
  79 import org.simantics.browsing.ui.graph.impl.ReadGraphDataSource;
  80 import org.simantics.browsing.ui.graph.impl.RelatedObjectsQueryProcessor;
  81 import org.simantics.browsing.ui.graph.impl.SessionContextInputSource;
  82 import org.simantics.browsing.ui.model.browsecontexts.BrowseContext;
  83 import org.simantics.browsing.ui.model.nodetypes.NodeType;
  84 import org.simantics.browsing.ui.swt.Activator;
  85 import org.simantics.browsing.ui.swt.AdaptableHintContext;
  86 import org.simantics.browsing.ui.swt.ComparatorSelector;
  87 import org.simantics.browsing.ui.swt.ContextMenuInitializer;
  88 import org.simantics.browsing.ui.swt.DefaultExplorerSelectionListener;
  89 import org.simantics.browsing.ui.swt.DefaultIsCheckedProcessor2;
  90 import org.simantics.browsing.ui.swt.DefaultKeyListener;
  91 import org.simantics.browsing.ui.swt.DefaultMouseListener;
  92 import org.simantics.browsing.ui.swt.DefaultSelectionDataResolver;
  93 import org.simantics.browsing.ui.swt.FilterArea;
  94 import org.simantics.browsing.ui.swt.GraphExplorerFactory;
  95 import org.simantics.browsing.ui.swt.IContextMenuInitializer;
  96 import org.simantics.browsing.ui.swt.RootFilterArea;
  97 import org.simantics.browsing.ui.swt.StandardContextTypesQueryProcessor;
  98 import org.simantics.browsing.ui.swt.TypesQueryProcessor;
  99 import org.simantics.browsing.ui.swt.ViewpointSelector;
 100 import org.simantics.browsing.ui.swt.widgets.impl.Widget;
 101 import org.simantics.browsing.ui.swt.widgets.impl.WidgetSupport;
 102 import org.simantics.db.AsyncReadGraph;
 103 import org.simantics.db.ReadGraph;
 104 import org.simantics.db.Resource;
 105 import org.simantics.db.Session;
 106 import org.simantics.db.exception.DatabaseException;
 107 import org.simantics.db.layer0.SelectionHints;
 108 import org.simantics.db.layer0.request.PossibleVariable;
 109 import org.simantics.db.layer0.request.PossibleVariableRepresents;
 110 import org.simantics.db.layer0.variable.Variable;
 111 import org.simantics.db.management.ISessionContext;
 112 import org.simantics.db.management.ISessionContextChangedListener;
 113 import org.simantics.db.management.ISessionContextProvider;
 114 import org.simantics.db.management.SessionContextChangedEvent;
 115 import org.simantics.project.ProjectKeys;
 116 import org.simantics.ui.SimanticsUI;
 117 import org.simantics.ui.dnd.LocalObjectTransfer;
 118 import org.simantics.ui.dnd.LocalSelectionDragSourceListener;
 119 import org.simantics.ui.dnd.NoImageDragSourceEffect;
 120 import org.simantics.ui.dnd.SessionContainer;
 121 import org.simantics.ui.selection.AnyResource;
 122 import org.simantics.ui.selection.AnyVariable;
 123 import org.simantics.ui.selection.ExplorerColumnContentType;
 124 import org.simantics.ui.selection.ExplorerInputContentType;
 125 import org.simantics.ui.selection.WorkbenchSelectionContentType;
 126 import org.simantics.ui.selection.WorkbenchSelectionElement;
 127 import org.simantics.ui.selection.WorkbenchSelectionUtils;
 128 import org.simantics.utils.ObjectUtils;
 129 import org.simantics.utils.datastructures.Function;
 130 import org.simantics.utils.datastructures.disposable.DisposeState;
 131 import org.simantics.utils.datastructures.hints.HintListenerAdapter;
 132 import org.simantics.utils.datastructures.hints.HintTracker;
 133 import org.simantics.utils.datastructures.hints.IHintContext.Key;
 134 import org.simantics.utils.datastructures.hints.IHintListener;
 135 import org.simantics.utils.datastructures.hints.IHintObservable;
 136 import org.simantics.utils.datastructures.hints.IHintTracker;
 137 import org.slf4j.Logger;
 138 import org.slf4j.LoggerFactory;
 139
 140
 141 public class GraphExplorerComposite extends Composite implements Widget, IAdaptable {
 142
 143     private static final Logger LOGGER = LoggerFactory.getLogger(GraphExplorerComposite.class);
 144
 145     protected UserSelectedComparableFactoryQueryProcessor userSelectedComparableFactoryQueryProcessor;
 146     protected UserSelectedViewpointFactoryQueryProcessor  userSelectedViewpointFactoryQueryProcessor;
 147     protected FilterSelectionRequestQueryProcessor        filterSelectionRequestQueryProcessor;
 148     protected IFilterArea                                 filterArea;
 149     protected EvaluatorData                               evaluatorData;
 150
 151     protected LocalResourceManager                        resourceManager;
 152
 153     protected ISelectionListener                          workbenchSelectionListener;
 154
 155     private final int                                     style;
 156
 157     final private IWorkbenchSite                          site;
 158
 159     protected GraphExplorer                               explorer;
 160
 161     protected IMenuManager                                menuManager;
 162
 163     private final Map<String, Object>                     args;
 164
 165     protected ISessionContextProvider                       contextProvider;
 166
 167     private ISessionContext                               sessionContext;
 168
 169     private Object                                        dragSource;
 170
 171     private IHintTracker                                  sessionContextTracker = new SessionContextProjectTracker();
 172
 173     private InputSource                                   inputSource           = new DirectInputSource();
 174     private FilterAreaSource                              filterAreaSource    = new SelectionFilterAreaSource();
 175
 176     private final TreeColumnLayout                                                        ad;
 177     private String[]                                        editingColumn = ColumnKeys.KEYS_SINGLE;
 178
 179     private StatePersistor                                                                      persistor = null;
 180
 181     private final Composite                                                                       toolComposite;
 182     private final Composite                                                                       toolComposite2;
 183     private final Composite                                                                       explorerComposite;
 184     final private WidgetSupport                                 support;
 185     private final boolean                                                                       useNodeBrowseContexts;
 186     private final boolean                                                                       useNodeActionContexts;
 187
 188     static class SelectionElement extends AdaptableHintContext {
 189
 190         final public WorkbenchSelectionElement wse;
 191         final public Object content;
 192         final public Resource resource;
 193         final public Variable variable;
 194         final public Object input;
 195         final public TransientExplorerState explorerState;
 196
 197         private WorkbenchSelectionElement extractWse(Object content) {
 198             if(content instanceof NodeContext) {
 199                 NodeContext context = (NodeContext)content;
 200                 Object input = context.getConstant(NodeType.TYPE);
 201                 if(input instanceof NodeType)
 202                     return ((NodeType)input).getWorkbenchSelectionElement(context);
 203             }
 204             return null;
 205         }
 206
 207         private Resource extractResource(Object content) {
 208                 if(content instanceof NodeContext) {
 209                         NodeContext context = (NodeContext)content;
 210                         Object input = context.getConstant(BuiltinKeys.INPUT);
 211                         if(input instanceof Resource) return (Resource)input;
 212                         if(input instanceof IAdaptable) {
 213                                 Resource var = (Resource)((IAdaptable)input).getAdapter(Resource.class);
 214                                 if(var != null) return var;
 215                         }
 216                 }
 217                 return null;
 218         }
 219
 220         private Variable extractVariable(Object content) {
 221                 if(content instanceof NodeContext) {
 222                         NodeContext context = (NodeContext)content;
 223                         Object input = context.getConstant(BuiltinKeys.INPUT);
 224                         if(input instanceof Variable) return (Variable)input;
 225                         if(input instanceof IAdaptable) {
 226                                 Variable var = (Variable)((IAdaptable)input).getAdapter(Variable.class);
 227                                 if(var != null) return var;
 228                         }
 229                 }
 230                 return null;
 231         }
 232
 233         private Object extractInput(Object content) {
 234                 if(content instanceof NodeContext) {
 235                         NodeContext context = (NodeContext)content;
 236                         return context.getConstant(BuiltinKeys.INPUT);
 237                 }
 238                 return null;
 239         }
 240
 241         public SelectionElement(GraphExplorer explorer, Key[] keys, Object content) {
 242             super(keys);
 243             this.content = content;
 244             this.wse = extractWse(content);
 245             this.resource = extractResource(content);
 246             this.variable = extractVariable(content);
 247             this.input = extractInput(content);
 248             this.explorerState = explorer.getTransientState();
 249         }
 250
 251         @SuppressWarnings("unchecked")
 252         @Override
 253         public <T> T getContent(WorkbenchSelectionContentType<T> contentType) {
 254             if (wse != null) {
 255                 T result = wse.getContent(contentType);
 256                 if (result != null)
 257                     return result;
 258             }
 259
 260             if (contentType instanceof AnyResource) {
 261                 if (resource != null)
 262                     return (T) resource;
 263                 if (variable == null)
 264                     return null;
 265                 try {
 266                     return (T) ((AnyResource) contentType).processor.syncRequest(new PossibleVariableRepresents(variable));
 267                 } catch (DatabaseException e) {
 268                     LOGGER.error("Unexpected error occurred while resolving Resource from Variable " + variable, e);
 269                 }
 270             }
 271             else if (contentType instanceof AnyVariable) {
 272                 if (variable != null)
 273                     return (T) variable;
 274                 if (resource == null)
 275                     return null;
 276                 try {
 277                     return (T) ((AnyVariable) contentType).processor.syncRequest(new PossibleVariable(resource));
 278                 } catch (DatabaseException e) {
 279                     LOGGER.error("Unexpected error occurred while resolving Variable from Resource " + resource, e);
 280                 }
 281             } else if (contentType instanceof ExplorerInputContentType) {
 282                 return (T) input;
 283             } else if (contentType instanceof ExplorerColumnContentType) {
 284                 return (T) explorerState.getActiveColumn();
 285             }
 286             return null;
 287         }
 288
 289         @SuppressWarnings("rawtypes")
 290         @Override
 291         public Object getAdapter(Class adapter) {
 292                 if(WorkbenchSelectionElement.class == adapter) {
 293                         return wse;
 294                 }
 295                 if(NodeContext.class == adapter) {
 296                     if(content instanceof NodeContext)
 297                         return (NodeContext)content;
 298                     else
 299                         return null;
 300                 }
 301                 return super.getAdapter(adapter);
 302         }
 303
 304     }
 305     private BiFunction<GraphExplorer, Object[], Object[]> selectionTransformation = new BiFunction<GraphExplorer, Object[], Object[]>() {
 306
 307         private Key[] KEYS = new Key[] { SelectionHints.KEY_MAIN };
 308
 309         @Override
 310         public Object[] apply(GraphExplorer explorer, Object[] objects) {
 311             Object[] result = new Object[objects.length];
 312             for (int i = 0; i < objects.length; i++) {
 313                 SelectionElement context = new SelectionElement(explorer, KEYS, objects[i]);
 314                 context.setHint(SelectionHints.KEY_MAIN, objects[i]);
 315                 result[i] = context;
 316             }
 317             return result;
 318         }
 319
 320     };
 321
 322     private Set<String>                                   browseContexts        = null;
 323
 324     private DisposeState                                  disposeState          = DisposeState.Alive;
 325
 326     private boolean                                       created               = false;
 327
 328     protected String                                      contextMenuId         = null;
 329
 330     protected Set<String>                                 uiContext             = null;
 331
 332     protected ISessionContextChangedListener              contextChangeListener = new ISessionContextChangedListener() {
 333         @Override
 334         public void sessionContextChanged(SessionContextChangedEvent event) {
 335             sessionContext = event.getNewValue();
 336             sessionContextTracker.track(sessionContext);
 337         }
 338     };
 339
 340     public GraphExplorerComposite(Map<String, Object> args, IWorkbenchSite site, Composite parent, WidgetSupport support, int style) {
 341
 342         super(parent, SWT.NONE);
 343
 344         if (args == null)
 345             args = Collections.emptyMap();
 346
 347         this.args = args;
 348         this.site = site;
 349         this.style = style;
 350         this.resourceManager = new LocalResourceManager(JFaceResources.getResources(parent.getDisplay()), this);
 351
 352         contextProvider = getSessionContextProvider(site);
 353
 354         Integer maxChildren = (Integer)args.get("maxChildren");
 355
 356         GridLayoutFactory.fillDefaults().equalWidth(false).numColumns(1).margins(0,0).spacing(0,0).applyTo(this);
 357
 358         toolComposite = new Composite(this, SWT.NONE);
 359 //        toolComposite.setBackground(toolComposite.getDisplay().getSystemColor(SWT.COLOR_DARK_YELLOW));
 360 //        GridDataFactory.fillDefaults().grab(true, false).minSize(1, 1).applyTo(toolComposite);
 361         GridDataFactory.fillDefaults().grab(true, false).applyTo(toolComposite);
 362         GridLayoutFactory.fillDefaults().applyTo(toolComposite);
 363
 364         ad = new TreeColumnLayout();
 365         explorerComposite = new Composite(this, SWT.NONE);
 366         explorerComposite.setLayout(ad);
 367         GridDataFactory.fillDefaults().grab(true, true).minSize(1, 50).applyTo(explorerComposite);
 368
 369         if (args.containsKey("treeView") && Boolean.TRUE.equals(args.get("treeView"))) {
 370                 explorer = createExplorerControl2(explorerComposite, maxChildren);
 371         } else if (args.containsKey("natTable") && Boolean.TRUE.equals(args.get("natTable"))) {
 372                 explorer = createExplorerControl3(explorerComposite, maxChildren);
 373         } else {
 374                 explorer = createExplorerControl(explorerComposite, maxChildren);
 375         }
 376         explorer.addListener(new DefaultMouseListener(explorer));
 377
 378         if (args.containsKey("useNodeBrowseContexts") && Boolean.TRUE.equals(args.get("useNodeBrowseContexts"))) {
 379                 useNodeBrowseContexts = true;
 380         } else {
 381                 useNodeBrowseContexts = false;
 382         }
 383
 384         if (args.containsKey("useNodeActionContexts") && Boolean.TRUE.equals(args.get("useNodeActionContexts"))) {
 385                 useNodeActionContexts = true;
 386         } else {
 387                 useNodeActionContexts = false;
 388         }
 389
 390         toolComposite2 = new Composite(this, SWT.NONE);
 391 //        toolComposite2.setBackground(toolComposite2.getDisplay().getSystemColor(SWT.COLOR_DARK_YELLOW));
 392 //        GridDataFactory.fillDefaults().grab(true, false).minSize(1, 1).applyTo(toolComposite);
 393         GridDataFactory.fillDefaults().grab(true, false).applyTo(toolComposite2);
 394         GridLayoutFactory.fillDefaults().applyTo(toolComposite2);
 395
 396         this.support = support;
 397
 398         if (support != null)
 399             support.register(this);
 400
 401     }
 402
 403     public GraphExplorerComposite(Map<String, Object> args, IWorkbenchSite site, Composite parent, int style) {
 404
 405         this(args, site, parent, null, style);
 406
 407     }
 408
 409     public ISessionContextProvider getSessionContextProvider(IWorkbenchSite site) {
 410         if(site != null)
 411             return SimanticsUI.getSessionContextProvider(site.getWorkbenchWindow());
 412         else
 413             return SimanticsUI.getSessionContextProvider();
 414     }
 415
 416     public GraphExplorer getExplorer() {
 417         return explorer;
 418     }
 419
 420     public Composite getExplorerComposite() {
 421         return explorerComposite;
 422     }
 423
 424     public <T> T getExplorerControl() {
 425         return explorer.getControl();
 426     }
 427
 428     public void addListenerToControl(int eventType, Listener listener) {
 429         ((Control)explorer.getControl()).addListener(eventType, listener);
 430     }
 431
 432     public void finish() {
 433         created = true;
 434         createControls(site);
 435         attachToSession();
 436     }
 437
 438     IWorkbenchSite getSite() {
 439         return site;
 440     }
 441
 442     protected void activateUiContexts() {
 443         Collection<String> contexts = getUiContexts();
 444         if (contexts == null || contexts.isEmpty())
 445             return;
 446         IWorkbenchSite site = getSite();
 447         if (site != null) {
 448             IContextService cs = (IContextService) getSite().getService(IContextService.class);
 449             for (String context : contexts)
 450                 cs.activateContext(context);
 451         }
 452     }
 453
 454     protected void createControls(IWorkbenchSite site) {
 455
 456         // Initialize explorer control.
 457 //        GridDataFactory.fillDefaults().grab(true, true).applyTo(explorer.getControl());
 458
 459         Control control = explorer.getControl();
 460
 461         // Initialize context menu if an initializer is provided.
 462         IContextMenuInitializer cmi = getContextMenuInitializer();
 463         if (cmi != null) {
 464             ISelectionProvider selectionProvider = (ISelectionProvider)explorer.getAdapter(ISelectionProvider.class);
 465             menuManager = cmi.createContextMenu(control, selectionProvider, site);
 466         }
 467
 468         // Initialize UI contexts
 469         activateUiContexts();
 470
 471         // Initialize DND.
 472         dragSource = setupDND(explorer);
 473
 474         // Listeners are only added once per listener, not every time the
 475         // session context changes.
 476         addListeners(explorer, menuManager);
 477
 478         userSelectedComparableFactoryQueryProcessor = new UserSelectedComparableFactoryQueryProcessor();
 479         userSelectedViewpointFactoryQueryProcessor = new UserSelectedViewpointFactoryQueryProcessor();
 480         filterSelectionRequestQueryProcessor = new FilterSelectionRequestQueryProcessor();
 481
 482         explorer.setPrimitiveProcessor(filterSelectionRequestQueryProcessor);
 483
 484         boolean hasExtraControls = false;
 485         boolean hasExtraControls2 = false;
 486
 487         Boolean displaySelectors = (Boolean)args.get("displaySelectors");
 488         if(displaySelectors == null || displaySelectors == true) {
 489
 490             @SuppressWarnings("unused")
 491             ComparatorSelector comparatorSelector = new ComparatorSelector(explorer, userSelectedComparableFactoryQueryProcessor, toolComposite, SWT.READ_ONLY);
 492 //            comparatorSelector.moveAbove(control);
 493
 494             @SuppressWarnings("unused")
 495             ViewpointSelector viewpointSelector = new ViewpointSelector(explorer, userSelectedViewpointFactoryQueryProcessor, toolComposite, SWT.READ_ONLY);
 496 //            viewpointSelector.moveAbove(control);
 497
 498             hasExtraControls = true;
 499
 500         }
 501
 502         Boolean displayFilter = (Boolean)args.get("displayFilter");
 503         if(displayFilter == null || displayFilter == true) {
 504
 505
 506                 filterArea = filterAreaSource.getFilterArea(toolComposite, explorer);
 507 //            filterArea = new FilterArea(explorer, filterSelectionRequestQueryProcessor, toolComposite, SWT.READ_ONLY);
 508             //filterArea.moveAbove(control);
 509
 510             hasExtraControls = true;
 511
 512         }
 513
 514         Boolean displayFilter2 = (Boolean)args.get("displayFilter2");
 515         if(displayFilter2 != null && displayFilter2 == true) {
 516
 517                 filterArea = filterAreaSource.getFilterArea(toolComposite2, explorer);
 518 //            filterArea = new FilterArea(explorer, filterSelectionRequestQueryProcessor, toolComposite2, SWT.READ_ONLY);
 519 //            //filterArea.moveAbove(control);
 520
 521             hasExtraControls2 = true;
 522
 523         }
 524
 525 //        filterArea = new FilterArea(explorer, filterSelectionRequestQueryProcessor, this, SWT.READ_ONLY);
 526 //        filterArea.moveAbove(control);
 527
 528         if(!hasExtraControls)
 529             GridDataFactory.fillDefaults().grab(true, false).minSize(0, 0).hint(0, 0).applyTo(toolComposite);
 530         if(!hasExtraControls2)
 531             GridDataFactory.fillDefaults().grab(true, false).minSize(0, 0).hint(0, 0).applyTo(toolComposite2);
 532
 533         GridDataFactory.fillDefaults().grab(true, true).span(2,1).applyTo(control);
 534
 535         //tree.getTree().setLayout(new FillLayout()
 536         //this.setLayout(LayoutUtils.createNoBorderGridLayout(2, false));
 537
 538         DropTarget target = new DropTarget(control, DND.DROP_COPY | DND.DROP_MOVE | DND.DROP_LINK | DND.DROP_DEFAULT);
 539         target.setTransfer(getAcceptedDataTypes());
 540         if (control instanceof Tree)  {
 541         target.addDropListener(new DropTargetListener() {
 542
 543             Tree tree = (Tree)explorer.getControl();
 544
 545             @Override
 546             public void dragEnter(DropTargetEvent event) {
 547                 event.detail = DND.DROP_COPY;
 548             }
 549
 550             @Override
 551             public void dragLeave(DropTargetEvent event) {
 552             }
 553
 554             @Override
 555             public void dragOperationChanged(DropTargetEvent event) {
 556             }
 557
 558             @Override
 559             public void dragOver(DropTargetEvent event) {
 560             }
 561
 562             @Override
 563             public void drop(DropTargetEvent event) {
 564                 TreeItem item = tree.getItem(tree.toControl(event.x, event.y));
 565                 if(item != null) {
 566                         Object data = item.getData();
 567                         if (data instanceof NodeContext)
 568                                 handleDrop(event.data, (NodeContext) data);
 569                         else if (data instanceof IAdaptable) {
 570                                 IAdaptable a = (IAdaptable) data;
 571                                 handleDrop(event.data, (NodeContext) a.getAdapter(NodeContext.class));
 572                         }
 573                 } else
 574                     handleDrop(event.data, null);
 575             }
 576
 577             @Override
 578             public void dropAccept(DropTargetEvent event) {
 579             }
 580
 581         });
 582         }
 583
 584         // Add workbench listeners and make sure they are cleaned up
 585         setWorkbenchListeners();
 586         control.addListener(SWT.Dispose, new Listener() {
 587             @Override
 588             public void handleEvent(Event event) {
 589                 doDispose();
 590             }
 591         });
 592     }
 593
 594     @SuppressWarnings({ "rawtypes", "unchecked" })
 595     @Override
 596     public Object getAdapter(Class adapter) {
 597         if (GraphExplorer.class == adapter)
 598             return explorer;
 599         if (EvaluatorData.class == adapter)
 600             return evaluatorData;
 601         if (BrowseContext.class == adapter) {
 602             EvaluatorData ed = evaluatorData;
 603             return ed != null ? ed.getBrowseContext() : null;
 604         }
 605         if (adapter == IFilterAreaProvider.class)
 606             return filterArea;
 607         return explorer.getAdapter(adapter);
 608     }
 609
 610     protected void doDispose() {
 611         //System.out.println(this + ".GraphExplorerComposite.doDispose()");
 612         removeWorkbenchListeners();
 613         userSelectedComparableFactoryQueryProcessor = null;
 614         userSelectedViewpointFactoryQueryProcessor = null;
 615         filterSelectionRequestQueryProcessor = null;
 616
 617         disposeState = DisposeState.Disposing;
 618         try {
 619             //System.out.println(this + ".GraphExplorerViewBase.dispose()");
 620             if (contextProvider != null) {
 621                 contextProvider.removeContextChangedListener(contextChangeListener);
 622                 contextProvider = null;
 623             }
 624             sessionContextTracker.untrack();
 625             resourceManager = null;
 626             explorer = null;
 627             sessionContext = null;
 628             dragSource = null;
 629 //            parent = null;
 630         } finally {
 631             disposeState = DisposeState.Disposed;
 632         }
 633     }
 634
 635     @Override
 636     public void dispose() {
 637         doDispose();
 638         super.dispose();
 639     }
 640
 641     protected StatePersistor getStatePersistor() {
 642         return persistor;
 643     }
 644
 645     public void setStatePersistor(StatePersistor persistor) {
 646         this.persistor = persistor;
 647     }
 648
 649     protected void initializeExplorer(GraphExplorer explorer, ISessionContext context) {
 650
 651         if(explorer == null || explorer.isDisposed()) return;
 652         if(context == null) return;
 653         if(browseContexts == null) return;
 654
 655         Session session = context != null ? context.getSession() : null;
 656         setupDragSource(session);
 657
 658         if (session != null) {
 659             evaluatorData = createEvaluatorData(session);
 660             explorer.setDataSource(new AsyncReadGraphDataSource(session));
 661             explorer.setDataSource(new ReadGraphDataSource(session));
 662         }
 663         else {
 664             evaluatorData = new EvaluatorDataImpl();
 665             explorer.removeDataSource(AsyncReadGraph.class);
 666             explorer.removeDataSource(ReadGraph.class);
 667         }
 668
 669         explorer.setPersistor(getStatePersistor());
 670
 671         explorer.setProcessor(new ComparableFactoryResolver(evaluatorData));
 672         explorer.setProcessor(new ViewpointFactoryResolver(evaluatorData));
 673         explorer.setProcessor(new LabelerFactoryResolver(evaluatorData));
 674         explorer.setProcessor(new ImagerFactoryResolver(evaluatorData));
 675         explorer.setProcessor(new LabelDecoratorFactoryResolver(evaluatorData));
 676         explorer.setProcessor(new ImageDecoratorFactoryResolver(evaluatorData));
 677         explorer.setProcessor(new DefaultIsCheckedProcessor2(evaluatorData));
 678         explorer.setPrimitiveProcessor(new TypesQueryProcessor());
 679         explorer.setPrimitiveProcessor(new StandardContextTypesQueryProcessor());
 680         explorer.setPrimitiveProcessor(new InheritsQueryProcessor());
 681         explorer.setPrimitiveProcessor(new RelatedObjectsQueryProcessor());
 682
 683         explorer.setPrimitiveProcessor(userSelectedViewpointFactoryQueryProcessor);
 684         explorer.setProcessor(new ComparableSelectorQueryProcessor());
 685         explorer.setPrimitiveProcessor(userSelectedComparableFactoryQueryProcessor);
 686         explorer.setPrimitiveProcessor(filterSelectionRequestQueryProcessor);
 687
 688         initializeExplorerWithEvaluator(explorer, context, evaluatorData);
 689     }
 690
 691     protected void initializeExplorerWithEvaluator(GraphExplorer explorer, ISessionContext context, EvaluatorData data) {
 692     }
 693
 694     protected EvaluatorData createEvaluatorData(Session context) {
 695
 696 //        Set<String> browseContexts = getArgument("browseContexts");
 697
 698         return Evaluators.load(context.getSession(), browseContexts, resourceManager, useNodeBrowseContexts, useNodeActionContexts);
 699
 700     }
 701
 702     protected Transfer[] getAcceptedDataTypes() {
 703         return new Transfer[] { LocalObjectTransfer.getTransfer(), FileTransfer.getInstance(), TextTransfer.getInstance() };
 704     }
 705
 706     protected void handleDrop(Object data, NodeContext target) {
 707     }
 708
 709     DragSourceListenerFactory dragSourceListenerFactory = new DragSourceListenerFactory() {
 710
 711         final Transfer[] transfers = new Transfer[] {LocalObjectTransfer.getTransfer(), TextTransfer.getInstance() };
 712
 713         @Override
 714         public DragSourceListener get(ISelectionProvider selectionProvider) {
 715
 716                 LocalSelectionDragSourceListener ls = new LocalSelectionDragSourceListener(selectionProvider);
 717
 718                 return new DragSourceListener() {
 719
 720                                 @Override
 721                                 public void dragStart(DragSourceEvent event) {
 722                                         ls.dragStart(event);
 723                                 }
 724
 725                                 @Override
 726                                 public void dragSetData(DragSourceEvent event) {
 727                                         if(TextTransfer.getInstance().isSupportedType(event.dataType)) {
 728                                         try {
 729                                                         event.data = WorkbenchSelectionUtils.getPossibleJSON(selectionProvider.getSelection());
 730                                                 } catch (DatabaseException e) {
 731                                                         event.data = "{ type:\"Exception\" }";
 732                                                         LOGGER.error("Failed to get current selection as JSON.", e);
 733                                                 }
 734                                         } else if (LocalObjectTransfer.getTransfer().isSupportedType(event.dataType)) {
 735                                                 ls.dragSetData(event);
 736                                         }
 737                                 }
 738
 739                                 @Override
 740                                 public void dragFinished(DragSourceEvent event) {
 741                                         ls.dragFinished(event);
 742                                 }
 743                         };
 744         }
 745
 746         @Override
 747         public Transfer[] getTransfers() {
 748             return transfers;
 749         }
 750
 751     };
 752
 753     public void setDragSourceListenerFactory(DragSourceListenerFactory dragSourceListenerFactory) {
 754         this.dragSourceListenerFactory = dragSourceListenerFactory;
 755     }
 756
 757     protected DragSourceListener setupDND(GraphExplorer explorer) {
 758
 759         ISelectionProvider selectionProvider = (ISelectionProvider)explorer.getAdapter(ISelectionProvider.class);
 760
 761         DragSourceListener listener = createDragSourceListener(selectionProvider);
 762
 763         Control control = explorer.getControl();
 764         DragSource source = createDragSource(control);
 765         source.setTransfer(getTransfers());
 766         source.addDragListener(listener);
 767         source.setDragSourceEffect(new NoImageDragSourceEffect(control));
 768
 769         return listener;
 770
 771     }
 772
 773     protected DragSourceListener createDragSourceListener(ISelectionProvider selectionProvider) {
 774         return dragSourceListenerFactory.get(selectionProvider);
 775     }
 776
 777     private int dragStyle = DND.DROP_LINK | DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_DEFAULT;
 778
 779     protected void setDragStyle(int style) {
 780         this.dragStyle = style;
 781     }
 782
 783     protected int getDragStyle() {
 784         return dragStyle;
 785     }
 786
 787     protected DragSource createDragSource(Control control) {
 788         return new DragSource(control, getDragStyle());
 789     }
 790
 791     protected Transfer[] getTransfers() {
 792         return dragSourceListenerFactory.getTransfers();
 793     }
 794
 795     public EvaluatorData getEvaluatorData() {
 796         return evaluatorData;
 797     }
 798
 799     public interface InputSource {
 800         /**
 801          * @param ctx the session context to read the input from. May be
 802          *        <code>null</code> if there is no session.
 803          * @return the input object of a graph explorer. To indicate no input,
 804          *         use {@link GraphExplorerConstants#EMPTY_INPUT}. Never return
 805          *         <code>null</code>.
 806          */
 807         Object get(ISessionContext ctx, Object selection);
 808     }
 809
 810     public interface FilterSource {
 811
 812
 813
 814     }
 815
 816     /**
 817      * The default hint tracker that will be active if
 818      * {@link GraphExplorerComposite#setSessionContextTracker(IHintTracker) is
 819      * not called.
 820      */
 821     public class SessionContextProjectTracker extends HintTracker {
 822         public SessionContextProjectTracker() {
 823             IHintListener activeProjectListener = new HintListenerAdapter() {
 824                 @Override
 825                 public void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
 826                     applySessionContext(getSessionContext());
 827                 }
 828             };
 829             addKeyHintListener(ProjectKeys.KEY_PROJECT, activeProjectListener);
 830         }
 831     }
 832
 833     public class DirectInputSource implements InputSource {
 834         @Override
 835         public Object get(ISessionContext ctx, Object selection) {
 836             return selection;
 837         }
 838     }
 839
 840     public static class SelectionFilterAreaSource implements FilterAreaSource {
 841
 842                 @Override
 843                 public IFilterArea getFilterArea(Composite parent, GraphExplorer explorer) {
 844                         FilterSelectionRequestQueryProcessor processor = (FilterSelectionRequestQueryProcessor)explorer.getPrimitiveProcessor(BuiltinKeys.SELECTION_REQUESTS);
 845                         return new FilterArea(explorer, processor, parent, SWT.READ_ONLY);
 846                 }
 847
 848     }
 849
 850     public static class RootFilterAreaSource implements FilterAreaSource {
 851
 852                 @Override
 853                 public IFilterArea getFilterArea(Composite parent, GraphExplorer explorer) {
 854                         FilterSelectionRequestQueryProcessor processor = (FilterSelectionRequestQueryProcessor)explorer.getPrimitiveProcessor(BuiltinKeys.SELECTION_REQUESTS);
 855                         return new RootFilterArea(explorer, processor, parent, SWT.READ_ONLY);
 856                 }
 857
 858     }
 859
 860     protected void setSessionContextTracker(IHintTracker tracker) {
 861         this.sessionContextTracker = tracker;
 862     }
 863
 864     public void setInputSource(InputSource source) {
 865         this.inputSource = source;
 866     }
 867
 868     public void setFilterAreaSource(FilterAreaSource provider) {
 869         this.filterAreaSource = provider;
 870     }
 871
 872     public void setSelectionTransformation(BiFunction<GraphExplorer, Object[], Object[]> transformation) {
 873         this.selectionTransformation = transformation;
 874         if(explorer != null) explorer.setSelectionTransformation(transformation);
 875     }
 876
 877     protected Set<String> getBrowseContexts() {
 878         return browseContexts;
 879     }
 880
 881     public void setBrowseContexts(Set<String> contexts) {
 882         this.browseContexts = contexts;
 883         //initializeExplorer(explorer, getSessionContext());
 884     }
 885
 886     public void setBrowseContexts(String ... contexts) {
 887         this.browseContexts = new HashSet<String>();
 888         for(String s : contexts) this.browseContexts.add(s);
 889         initializeExplorer(explorer, getSessionContext());
 890     }
 891
 892     public void setContextMenuId(String contextMenuId) {
 893         this.contextMenuId = contextMenuId;
 894     }
 895
 896 //    protected IContextMenuInitializer getContextMenuInitializer() {
 897 //        String contextMenuId = getContextMenuId();
 898 //        if(contextMenuId != null) {
 899 //            return new ContextMenuInitializer(contextMenuId);
 900 //        } else {
 901 //            return null;
 902 //        }
 903 //    }
 904
 905     protected String getContextMenuId() {
 906         return this.contextMenuId;
 907     }
 908
 909     public void setUiContexts(Set<String> uiContext) {
 910         this.uiContext = uiContext;
 911     }
 912
 913     public Set<String> getUiContexts() {
 914         return uiContext;
 915     }
 916
 917     protected InputSource getInputSource() {
 918         return inputSource;
 919     }
 920
 921     protected Map<String, Object> getArguments() {
 922         return args;
 923     }
 924
 925     @SuppressWarnings("unchecked")
 926     protected <T> T getArgument(String key) {
 927         return (T) args.get(key);
 928     }
 929
 930     protected DisposeState getDisposeState() {
 931         return disposeState;
 932     }
 933
 934     public ISessionContext getSessionContext() {
 935         return sessionContext;
 936     }
 937
 938     public ISessionContextProvider getSessionContextProvider() {
 939         return contextProvider;
 940     }
 941
 942     @Override
 943     public boolean setFocus() {
 944         if (explorer != null && !explorer.isDisposed())
 945             explorer.setFocus();
 946         return true;
 947     }
 948
 949     public void setWorkbenchListeners() {
 950         if (workbenchSelectionListener == null && getSite() != null) {
 951             ISelectionProvider selectionProvider = (ISelectionProvider) explorer.getAdapter(ISelectionProvider.class);
 952             getSite().setSelectionProvider(selectionProvider);
 953
 954             // Listen to the workbench selection also to propagate it to
 955             // the explorer also.
 956             workbenchSelectionListener = new DefaultExplorerSelectionListener(site.getPage().getActivePart(), explorer);
 957             //System.out.println("ADD WORKBENCH SELECTION LISTENER: " + workbenchSelectionListener);
 958             getSite().getWorkbenchWindow().getSelectionService().addPostSelectionListener(workbenchSelectionListener);
 959         }
 960     }
 961
 962     protected void removeWorkbenchListeners() {
 963         //System.out.println("REMOVE WORKBENCH SELECTION LISTENER: " + workbenchSelectionListener);
 964         // Remember to remove the installed workbench selection listener
 965         if (workbenchSelectionListener != null) {
 966             getSite().getWorkbenchWindow().getSelectionService().removePostSelectionListener(workbenchSelectionListener);
 967             workbenchSelectionListener = null;
 968
 969             ISelectionProvider selectionProvider = (ISelectionProvider) explorer.getAdapter(ISelectionProvider.class);
 970             if(getSite().getSelectionProvider() == selectionProvider) getSite().setSelectionProvider(null);
 971
 972         }
 973     }
 974
 975     protected final void attachToSession() {
 976
 977         // Track active ISessionContext changes
 978         //contextProvider = SimanticsUI.getSessionContextProvider(getViewSite().getWorkbenchWindow());
 979         contextProvider.addContextChangedListener(contextChangeListener);
 980
 981         // Start tracking the current session context for input changes.
 982         // This will/must cause applySessionContext to get called.
 983         // Doing the applySessionContext initialization this way
 984         // instead of directly calling it will also make sure that
 985         // applySessionContext is only called once when first initialized,
 986         // and not twice like with the direct invocation.
 987         this.sessionContext = contextProvider.getSessionContext();
 988         sessionContextTracker.track(sessionContext);
 989     }
 990
 991     // /////////////////////////////////////////////////////////////////////////
 992     // Override / implement these:
 993
 994 //    /**
 995 //     * Returns an ID that is used for persisting a GraphExplorer instance.
 996 //     *
 997 //     * Used for </code>restoreState(IMemento)</code> and
 998 //     * <code>restoreState(IMemento)</code> in OntologyExplorer. Must be unique
 999 //     * within a workbench part.
1000 //     *
1001 //     * @return a unique name for this particular graph explorer view used for
1002 //     *         saving and restoring the state of this view part
1003 //     */
1004 //    public String getExplorerName() {
1005 //        return "GraphExplorerViewBase";
1006 //    }
1007
1008     /**
1009      * Override this method to add controls to the view part. This is invoked
1010      * before attaching the view part to a database session.
1011      *
1012      * @param parent
1013      */
1014     protected void createControls(Composite parent) {
1015
1016     }
1017
1018     /**
1019      * Override this method and provide a proper context menu initializer if you
1020      * want to have this base class initialize one for you.
1021      *
1022      * @return the initializer to be used by {@link #createControls(Composite)}
1023      */
1024     protected IContextMenuInitializer getContextMenuInitializer() {
1025         String contextMenuId = getContextMenuId();
1026         if(contextMenuId != null) {
1027             return new ContextMenuInitializer(contextMenuId);
1028         } else {
1029             return null;
1030         }
1031     }
1032
1033     /**
1034      * @param parent
1035      * @return
1036      */
1037     protected GraphExplorer createExplorerControl(Composite parent, Integer maxChildren) {
1038         GraphExplorerFactory factory = GraphExplorerFactory.getInstance();
1039         if(maxChildren != null) factory = factory.maxChildrenShown(maxChildren);
1040
1041         GraphExplorer ge = factory
1042         .selectionDataResolver(new DefaultSelectionDataResolver())
1043         .selectionTransformation(selectionTransformation)
1044         .setServiceLocator(site)
1045         .create(parent, style);
1046
1047         return ge;
1048     }
1049
1050     protected GraphExplorer createExplorerControl2(Composite parent, Integer maxChildren) {
1051         GraphExplorerFactory factory = GraphExplorerFactory.getInstance();
1052         if(maxChildren != null) factory = factory.maxChildrenShown(maxChildren);
1053
1054         GraphExplorer ge = factory
1055         .selectionDataResolver(new DefaultSelectionDataResolver())
1056         .selectionTransformation(selectionTransformation)
1057         .setServiceLocator(site)
1058         .create2(parent, style);
1059
1060         return ge;
1061     }
1062
1063     protected GraphExplorer createExplorerControl3(Composite parent, Integer maxChildren) {
1064         GraphExplorerFactory factory = GraphExplorerFactory.getInstance();
1065         if(maxChildren != null) factory = factory.maxChildrenShown(maxChildren);
1066
1067         GraphExplorer ge = factory
1068         .selectionDataResolver(new DefaultSelectionDataResolver())
1069         .selectionTransformation(selectionTransformation)
1070         .setServiceLocator(site)
1071         .create3(parent, style);
1072
1073         return ge;
1074     }
1075
1076     protected void setupDragSource(Session session) {
1077         if (dragSource instanceof SessionContainer) {
1078             ((SessionContainer) dragSource).setSession(session);
1079         }
1080     }
1081
1082     /**
1083      * Override to customize the addition of listeners a newly created
1084      * GraphExplorer.
1085      *
1086      * @param explorer
1087      */
1088     protected void addListeners(GraphExplorer explorer, IMenuManager menuManager) {
1089         addSelectionInputListeners(explorer, menuManager);
1090     }
1091
1092     protected void addSelectionInputListeners(GraphExplorer explorer, IMenuManager menuManager) {
1093         // Consider ENTER presses to simulate mouse left button double clicks
1094         explorer.addListener(new DefaultKeyListener(contextProvider, explorer, new Function<String[]>() {
1095             @Override
1096             public String[] execute(Object... obj) {
1097                 return getEditingColumn((NodeContext) obj[0]);
1098             }
1099         }));
1100         // Default double click handling
1101         explorer.addListener(new DefaultMouseListener(explorer));
1102     }
1103
1104     protected String[] getEditingColumn(NodeContext context) {
1105         return editingColumn;
1106     }
1107
1108     public void setEditingColumn(String... columnKeysInOrderOfTrial) {
1109         this.editingColumn = columnKeysInOrderOfTrial;
1110     }
1111
1112     // Needed for preventing unnecessary re-initialization of the explorer with the same input.
1113     private Object currentInput;
1114     private Object currentRoot;
1115
1116     /**
1117      * Invoke this to reinitialize the explorer and reset its input. The input
1118      * will be resolved from the specified ISessionContext based on the
1119      * {@link SessionContextInputSource} that is currently in use. If the input
1120      * is identical to the previous input, nothing will be done.
1121      *
1122      * @param context
1123      */
1124     public final boolean applySessionContext(ISessionContext context) {
1125
1126         // If control is not alive anymore, do nothing.
1127         //System.out.println(this + ": applySessionContext(" + context + "), explorer="  + explorer);
1128         if (disposeState != DisposeState.Alive)
1129             return false;
1130
1131         //System.out.println(this + ": initializeExplorer(" + explorer + ", " + context + ")");
1132         initializeExplorer(explorer, context);
1133
1134
1135         // Start tracking the session context.
1136         //
1137         // If this is not the same session that is currently tracked, it will
1138         // cause IHintListeners of the sessionContextTracker to fire.
1139         // For this we need the above input equality (identity) checking.
1140         // This is here just to make sure that we are tracking the correct
1141         // session context.
1142         sessionContextTracker.track(sessionContext);
1143
1144         this.sessionContext = context;
1145         Object root = inputSource.get(context, currentInput);
1146         if (ObjectUtils.objectEquals(root, currentRoot))
1147             return false;
1148
1149         currentRoot = root;
1150
1151         //System.out.println(this + ": setRoot(" + input + ")");
1152         explorer.setUIContexts(uiContext);
1153         explorer.setRoot(root);
1154
1155         return true;
1156
1157     }
1158
1159     protected boolean isImportantInput(Object previousSelection, Object selection) {
1160         return !ObjectUtils.objectEquals(previousSelection, selection);
1161     }
1162
1163     public void setInput(Object selection, boolean force) {
1164
1165         assert(created);
1166
1167         if (isDisposed())
1168             return;
1169         if (sessionContext == null)
1170             return;
1171
1172         // Check if this is a duplicate of the previous selection to reduce unnecessary flicker.
1173         if (!force && !isImportantInput(currentInput, selection))
1174             return;
1175
1176         currentInput = selection;
1177
1178         Object root = inputSource.get(sessionContext, selection);
1179
1180         currentRoot = root;
1181
1182         explorer.setUIContexts(uiContext);
1183
1184         if (root == null) {
1185             explorer.setRoot(GraphExplorer.EMPTY_INPUT);
1186         } else {
1187             explorer.setRoot(root);
1188         }
1189
1190     }
1191
1192     public void setColumnsVisible(boolean visible) {
1193         explorer.setColumnsVisible(visible);
1194     }
1195
1196     private int getColumnWidth(Column column, ExplorerState state) {
1197         // Get saved width from the persistor if there is one.
1198         if (state != null && state.columnWidths != null) {
1199                 Integer width = state.columnWidths.get(column.getLabel());
1200                 if (width != null)
1201                         return width;
1202         }
1203         return column.getWidth();
1204     }
1205
1206     public void setColumns(Column[] columns) {
1207
1208         explorer.setColumns(columns, new Consumer<Map<Column, Object>>() {
1209
1210             @Override
1211             public void accept(Map<Column, Object> objects) {
1212                 ExplorerState state = null;
1213                 if (persistor != null) {
1214                         state = persistor.deserialize(
1215                                 Platform.getStateLocation(Activator.getDefault().getBundle()).toFile(),
1216                                 explorer.getRoot());
1217                 }
1218
1219                 for(Map.Entry<Column, Object> entry : objects.entrySet()) {
1220                     Column column = entry.getKey();
1221                     TreeColumn treeColumn = (TreeColumn)entry.getValue();
1222
1223                     if (column.getWidth() < 0) {
1224                         throw new IllegalArgumentException("Column minimum width cannot be < 0, got " + column.getWidth());
1225                     }
1226
1227                     int width = getColumnWidth(column, state);
1228                     if(column.hasGrab()) {
1229
1230                         ad.setColumnData(treeColumn, new ColumnWeightData(column.getWeight(), width));
1231
1232                     } else {
1233
1234                         ad.setColumnData(treeColumn, new ColumnWeightData(0, width));
1235
1236                     }
1237
1238                 }
1239             }
1240
1241         });
1242
1243     }
1244
1245     @Override
1246     public void setInput(ISessionContext context, Object input) {
1247         setInput(input, false);
1248     }
1249
1250     public void setMaxChildren(int maxChildren) {
1251         explorer.setMaxChildren(maxChildren);
1252     }
1253
1254     public <T> void addListener(ExplorerMouseListenerImpl<T> listener) {
1255
1256         support.register(listener);
1257         listener.register(explorer);
1258         explorer.addListener(listener);
1259
1260     }
1261
1262 //    @Override
1263 //    public Point computeSize(int wHint, int hHint) {
1264 //      Point p = super.computeSize(wHint, hHint);
1265 //      System.err.println("graphExplorerComposite.computeSize " + p);
1266 //      return p;
1267 //    }
1268 //
1269 //    @Override
1270 //    public Point computeSize(int wHint, int hHint, boolean changed) {
1271 //      Point p = super.computeSize(wHint, hHint, changed);
1272 //      System.err.println("graphExplorerComposite.computeSize " + p);
1273 //      return p;
1274 //    }
1275
1276 }