org.spearce.egit.ui/src/org/spearce/egit/ui/internal/decorators/GitLightweightDecorator.java

   1 /*******************************************************************************
   2  * Copyright (C) 2007, IBM Corporation and others
   3  * Copyright (C) 2007, Dave Watson <dwatson@mimvista.com>
   4  * Copyright (C) 2008, Robin Rosenberg <robin.rosenberg@dewire.com>
   5  * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
   6  * Copyright (C) 2008, Google Inc.
   7  * Copyright (C) 2008, Tor Arne Vestbø <torarnv@gmail.com>
   8  *
   9  * All rights reserved. This program and the accompanying materials
  10  * are made available under the terms of the Eclipse Public License v1.0
  11  * See LICENSE for the full license text, also available.
  12  *******************************************************************************/
  13
  14 package org.spearce.egit.ui.internal.decorators;
  15
  16 import java.io.IOException;
  17 import java.util.HashMap;
  18 import java.util.HashSet;
  19 import java.util.Map;
  20 import java.util.Set;
  21
  22 import org.eclipse.core.resources.IProject;
  23 import org.eclipse.core.resources.IResource;
  24 import org.eclipse.core.resources.IResourceChangeEvent;
  25 import org.eclipse.core.resources.IResourceChangeListener;
  26 import org.eclipse.core.resources.IResourceDelta;
  27 import org.eclipse.core.resources.IResourceDeltaVisitor;
  28 import org.eclipse.core.resources.ResourcesPlugin;
  29 import org.eclipse.core.resources.mapping.ResourceMapping;
  30 import org.eclipse.core.runtime.CoreException;
  31 import org.eclipse.core.runtime.IAdaptable;
  32 import org.eclipse.core.runtime.IStatus;
  33 import org.eclipse.jface.preference.IPreferenceStore;
  34 import org.eclipse.jface.resource.ImageDescriptor;
  35 import org.eclipse.jface.util.IPropertyChangeListener;
  36 import org.eclipse.jface.util.PropertyChangeEvent;
  37 import org.eclipse.jface.viewers.IDecoration;
  38 import org.eclipse.jface.viewers.ILightweightLabelDecorator;
  39 import org.eclipse.jface.viewers.LabelProvider;
  40 import org.eclipse.jface.viewers.LabelProviderChangedEvent;
  41 import org.eclipse.osgi.util.TextProcessor;
  42 import org.eclipse.swt.graphics.ImageData;
  43 import org.eclipse.swt.widgets.Display;
  44 import org.eclipse.team.ui.ISharedImages;
  45 import org.eclipse.team.ui.TeamImages;
  46 import org.eclipse.team.ui.TeamUI;
  47 import org.eclipse.ui.IContributorResourceAdapter;
  48 import org.eclipse.ui.PlatformUI;
  49 import org.spearce.egit.core.GitException;
  50 import org.spearce.egit.core.internal.util.ExceptionCollector;
  51 import org.spearce.egit.core.project.GitProjectData;
  52 import org.spearce.egit.core.project.RepositoryChangeListener;
  53 import org.spearce.egit.core.project.RepositoryMapping;
  54 import org.spearce.egit.ui.Activator;
  55 import org.spearce.egit.ui.UIIcons;
  56 import org.spearce.egit.ui.UIPreferences;
  57 import org.spearce.egit.ui.UIText;
  58 import org.spearce.egit.ui.internal.decorators.IDecoratableResource.Staged;
  59 import org.spearce.jgit.lib.IndexChangedEvent;
  60 import org.spearce.jgit.lib.RefsChangedEvent;
  61 import org.spearce.jgit.lib.Repository;
  62 import org.spearce.jgit.lib.RepositoryChangedEvent;
  63 import org.spearce.jgit.lib.RepositoryListener;
  64
  65 /**
  66  * Supplies annotations for displayed resources
  67  *
  68  * This decorator provides annotations to indicate the status of each resource
  69  * when compared to <code>HEAD</code>, as well as the index in the relevant
  70  * repository.
  71  *
  72  * TODO: Add support for colors and font decoration
  73  */
  74 public class GitLightweightDecorator extends LabelProvider implements
  75                 ILightweightLabelDecorator, IPropertyChangeListener,
  76                 IResourceChangeListener, RepositoryChangeListener, RepositoryListener {
  77
  78         /**
  79          * Property constant pointing back to the extension point id of the
  80          * decorator
  81          */
  82         public static final String DECORATOR_ID = "org.spearce.egit.ui.internal.decorators.GitLightweightDecorator"; //$NON-NLS-1$
  83
  84         /**
  85          * Bit-mask describing interesting changes for IResourceChangeListener
  86          * events
  87          */
  88         private static int INTERESTING_CHANGES = IResourceDelta.CONTENT
  89                         | IResourceDelta.MOVED_FROM | IResourceDelta.MOVED_TO
  90                         | IResourceDelta.OPEN | IResourceDelta.REPLACED
  91                         | IResourceDelta.TYPE;
  92
  93         /**
  94          * Collector for keeping the error view from filling up with exceptions
  95          */
  96         private static ExceptionCollector exceptions = new ExceptionCollector(
  97                         UIText.Decorator_exceptionMessage, Activator.getPluginId(),
  98                         IStatus.ERROR, Activator.getDefault().getLog());
  99
 100         /**
 101          * Constructs a new Git resource decorator
 102          */
 103         public GitLightweightDecorator() {
 104                 TeamUI.addPropertyChangeListener(this);
 105                 Activator.addPropertyChangeListener(this);
 106                 PlatformUI.getWorkbench().getThemeManager().getCurrentTheme()
 107                                 .addPropertyChangeListener(this);
 108                 Repository.addAnyRepositoryChangedListener(this);
 109                 GitProjectData.addRepositoryChangeListener(this);
 110                 ResourcesPlugin.getWorkspace().addResourceChangeListener(this,
 111                                 IResourceChangeEvent.POST_CHANGE);
 112         }
 113
 114         /*
 115          * (non-Javadoc)
 116          *
 117          * @see org.eclipse.jface.viewers.IBaseLabelProvider#dispose()
 118          */
 119         @Override
 120         public void dispose() {
 121                 super.dispose();
 122                 PlatformUI.getWorkbench().getThemeManager().getCurrentTheme()
 123                                 .removePropertyChangeListener(this);
 124                 TeamUI.removePropertyChangeListener(this);
 125                 Activator.removePropertyChangeListener(this);
 126                 Repository.removeAnyRepositoryChangedListener(this);
 127                 GitProjectData.removeRepositoryChangeListener(this);
 128                 ResourcesPlugin.getWorkspace().removeResourceChangeListener(this);
 129         }
 130
 131         /**
 132          * This method should only be called by the decorator thread.
 133          *
 134          * @see org.eclipse.jface.viewers.ILightweightLabelDecorator#decorate(java.lang.Object,
 135          *      org.eclipse.jface.viewers.IDecoration)
 136          */
 137         public void decorate(Object element, IDecoration decoration) {
 138                 final IResource resource = getResource(element);
 139                 if (resource == null)
 140                         return;
 141
 142                 // Don't decorate if the workbench is not running
 143                 if (!PlatformUI.isWorkbenchRunning())
 144                         return;
 145
 146                 // Don't decorate if UI plugin is not running
 147                 Activator activator = Activator.getDefault();
 148                 if (activator == null)
 149                         return;
 150
 151                 // Don't decorate the workspace root
 152                 if (resource.getType() == IResource.ROOT)
 153                         return;
 154
 155                 // Don't decorate non-existing resources
 156                 if (!resource.exists() && !resource.isPhantom())
 157                         return;
 158
 159                 // Make sure we're dealing with a project under Git revision control
 160                 final RepositoryMapping mapping = RepositoryMapping
 161                                 .getMapping(resource);
 162                 if (mapping == null)
 163                         return;
 164
 165                 // Cannot decorate linked resources
 166                 if (mapping.getRepoRelativePath(resource) == null)
 167                         return;
 168
 169                 try {
 170                         DecorationHelper helper = new DecorationHelper(activator
 171                                         .getPreferenceStore());
 172                         helper.decorate(decoration,
 173                                         new DecoratableResourceAdapter(resource));
 174                 } catch (IOException e) {
 175                         handleException(resource, GitException.wrapException(e));
 176                 }
 177         }
 178
 179         /**
 180          * Helper class for doing resource decoration, based on the given
 181          * preferences
 182          *
 183          * Used for real-time decoration, as well as in the decorator preview
 184          * preferences page
 185          */
 186         public static class DecorationHelper {
 187
 188                 /** */
 189                 public static final String BINDING_RESOURCE_NAME = "name"; //$NON-NLS-1$
 190
 191                 /** */
 192                 public static final String BINDING_BRANCH_NAME = "branch"; //$NON-NLS-1$
 193
 194                 /** */
 195                 public static final String BINDING_DIRTY_FLAG = "dirty"; //$NON-NLS-1$
 196
 197                 /** */
 198                 public static final String BINDING_STAGED_FLAG = "staged"; //$NON-NLS-1$
 199
 200                 private IPreferenceStore store;
 201
 202                 /**
 203                  * Define a cached image descriptor which only creates the image data
 204                  * once
 205                  */
 206                 private static class CachedImageDescriptor extends ImageDescriptor {
 207                         ImageDescriptor descriptor;
 208
 209                         ImageData data;
 210
 211                         public CachedImageDescriptor(ImageDescriptor descriptor) {
 212                                 this.descriptor = descriptor;
 213                         }
 214
 215                         public ImageData getImageData() {
 216                                 if (data == null) {
 217                                         data = descriptor.getImageData();
 218                                 }
 219                                 return data;
 220                         }
 221                 }
 222
 223                 private static ImageDescriptor trackedImage;
 224
 225                 private static ImageDescriptor untrackedImage;
 226
 227                 private static ImageDescriptor stagedImage;
 228
 229                 private static ImageDescriptor stagedAddedImage;
 230
 231                 private static ImageDescriptor stagedRemovedImage;
 232
 233                 private static ImageDescriptor conflictImage;
 234
 235                 private static ImageDescriptor assumeValidImage;
 236
 237                 static {
 238                         trackedImage = new CachedImageDescriptor(TeamImages
 239                                         .getImageDescriptor(ISharedImages.IMG_CHECKEDIN_OVR));
 240                         untrackedImage = new CachedImageDescriptor(UIIcons.OVR_UNTRACKED);
 241                         stagedImage = new CachedImageDescriptor(UIIcons.OVR_STAGED);
 242                         stagedAddedImage = new CachedImageDescriptor(UIIcons.OVR_STAGED_ADD);
 243                         stagedRemovedImage = new CachedImageDescriptor(
 244                                         UIIcons.OVR_STAGED_REMOVE);
 245                         conflictImage = new CachedImageDescriptor(UIIcons.OVR_CONFLICT);
 246                         assumeValidImage = new CachedImageDescriptor(UIIcons.OVR_ASSUMEVALID);
 247                 }
 248
 249                 /**
 250                  * Constructs a decorator using the rules from the given
 251                  * <code>preferencesStore</code>
 252                  *
 253                  * @param preferencesStore
 254                  *            the preferences store with the preferred decorator rules
 255                  */
 256                 public DecorationHelper(IPreferenceStore preferencesStore) {
 257                         store = preferencesStore;
 258                 }
 259
 260                 /**
 261                  * Decorates the given <code>decoration</code> based on the state of the
 262                  * given <code>resource</code>, using the preferences passed when
 263                  * constructing this decoration helper.
 264                  *
 265                  * @param decoration
 266                  *            the decoration to decorate
 267                  * @param resource
 268                  *            the resource to retrieve state from
 269                  */
 270                 public void decorate(IDecoration decoration,
 271                                 IDecoratableResource resource) {
 272                         if (resource.isIgnored())
 273                                 return;
 274
 275                         decorateText(decoration, resource);
 276                         decorateIcons(decoration, resource);
 277                 }
 278
 279                 private void decorateText(IDecoration decoration,
 280                                 IDecoratableResource resource) {
 281                         String format = "";
 282                         switch (resource.getType()) {
 283                         case IResource.FILE:
 284                                 format = store
 285                                                 .getString(UIPreferences.DECORATOR_FILETEXT_DECORATION);
 286                                 break;
 287                         case IResource.FOLDER:
 288                                 format = store
 289                                                 .getString(UIPreferences.DECORATOR_FOLDERTEXT_DECORATION);
 290                                 break;
 291                         case IResource.PROJECT:
 292                                 format = store
 293                                                 .getString(UIPreferences.DECORATOR_PROJECTTEXT_DECORATION);
 294                                 break;
 295                         }
 296
 297                         Map<String, String> bindings = new HashMap<String, String>();
 298                         bindings.put(BINDING_RESOURCE_NAME, resource.getName());
 299                         bindings.put(BINDING_BRANCH_NAME, resource.getBranch());
 300                         bindings.put(BINDING_DIRTY_FLAG, resource.isDirty() ? ">" : null);
 301                         bindings.put(BINDING_STAGED_FLAG,
 302                                         resource.staged() != Staged.NOT_STAGED ? "*" : null);
 303
 304                         decorate(decoration, format, bindings);
 305                 }
 306
 307                 private void decorateIcons(IDecoration decoration,
 308                                 IDecoratableResource resource) {
 309                         ImageDescriptor overlay = null;
 310
 311                         if (resource.isTracked()) {
 312                                 if (store.getBoolean(UIPreferences.DECORATOR_SHOW_TRACKED_ICON))
 313                                         overlay = trackedImage;
 314
 315                                 if (store
 316                                                 .getBoolean(UIPreferences.DECORATOR_SHOW_ASSUME_VALID_ICON)
 317                                                 && resource.isAssumeValid())
 318                                         overlay = assumeValidImage;
 319
 320                                 // Staged overrides tracked
 321                                 Staged staged = resource.staged();
 322                                 if (store.getBoolean(UIPreferences.DECORATOR_SHOW_STAGED_ICON)
 323                                                 && staged != Staged.NOT_STAGED) {
 324                                         if (staged == Staged.ADDED)
 325                                                 overlay = stagedAddedImage;
 326                                         else if (staged == Staged.REMOVED)
 327                                                 overlay = stagedRemovedImage;
 328                                         else
 329                                                 overlay = stagedImage;
 330                                 }
 331
 332                                 // Conflicts override everything
 333                                 if (store
 334                                                 .getBoolean(UIPreferences.DECORATOR_SHOW_CONFLICTS_ICON)
 335                                                 && resource.hasConflicts())
 336                                         overlay = conflictImage;
 337
 338                         } else if (store
 339                                         .getBoolean(UIPreferences.DECORATOR_SHOW_UNTRACKED_ICON)) {
 340                                 overlay = untrackedImage;
 341                         }
 342
 343                         // Overlays can only be added once, so do it at the end
 344                         decoration.addOverlay(overlay);
 345                 }
 346
 347                 /**
 348                  * Decorates the given <code>decoration</code>, using the specified text
 349                  * <code>format</code>, and mapped using the variable bindings from
 350                  * <code>bindings</code>
 351                  *
 352                  * @param decoration
 353                  *            the decoration to decorate
 354                  * @param format
 355                  *            the format to base the decoration on
 356                  * @param bindings
 357                  *            the bindings between variables in the format and actual
 358                  *            values
 359                  */
 360                 public static void decorate(IDecoration decoration, String format,
 361                                 Map<String, String> bindings) {
 362                         StringBuffer prefix = new StringBuffer();
 363                         StringBuffer suffix = new StringBuffer();
 364                         StringBuffer output = prefix;
 365
 366                         int length = format.length();
 367                         int start = -1;
 368                         int end = length;
 369                         while (true) {
 370                                 if ((end = format.indexOf('{', start)) > -1) {
 371                                         output.append(format.substring(start + 1, end));
 372                                         if ((start = format.indexOf('}', end)) > -1) {
 373                                                 String key = format.substring(end + 1, start);
 374                                                 String s;
 375
 376                                                 // Allow users to override the binding
 377                                                 if (key.indexOf(':') > -1) {
 378                                                         String[] keyAndBinding = key.split(":", 2);
 379                                                         key = keyAndBinding[0];
 380                                                         if (keyAndBinding.length > 1
 381                                                                         && bindings.get(key) != null)
 382                                                                 bindings.put(key, keyAndBinding[1]);
 383                                                 }
 384
 385                                                 // We use the BINDING_RESOURCE_NAME key to determine if
 386                                                 // we are doing the prefix or suffix. The name isn't
 387                                                 // actually part of either.
 388                                                 if (key.equals(BINDING_RESOURCE_NAME)) {
 389                                                         output = suffix;
 390                                                         s = null;
 391                                                 } else {
 392                                                         s = bindings.get(key);
 393                                                 }
 394
 395                                                 if (s != null) {
 396                                                         output.append(s);
 397                                                 } else {
 398                                                         // Support removing prefix character if binding is
 399                                                         // null
 400                                                         int curLength = output.length();
 401                                                         if (curLength > 0) {
 402                                                                 char c = output.charAt(curLength - 1);
 403                                                                 if (c == ':' || c == '@') {
 404                                                                         output.deleteCharAt(curLength - 1);
 405                                                                 }
 406                                                         }
 407                                                 }
 408                                         } else {
 409                                                 output.append(format.substring(end, length));
 410                                                 break;
 411                                         }
 412                                 } else {
 413                                         output.append(format.substring(start + 1, length));
 414                                         break;
 415                                 }
 416                         }
 417
 418                         String prefixString = prefix.toString().replaceAll("^\\s+", "");
 419                         if (prefixString != null) {
 420                                 decoration.addPrefix(TextProcessor.process(prefixString,
 421                                                 "()[].")); //$NON-NLS-1$
 422                         }
 423                         String suffixString = suffix.toString().replaceAll("\\s+$", "");
 424                         if (suffixString != null) {
 425                                 decoration.addSuffix(TextProcessor.process(suffixString,
 426                                                 "()[].")); //$NON-NLS-1$
 427                         }
 428                 }
 429         }
 430
 431         // -------- Refresh handling --------
 432
 433         /**
 434          * Perform a blanket refresh of all decorations
 435          */
 436         public static void refresh() {
 437                 Display.getDefault().asyncExec(new Runnable() {
 438                         public void run() {
 439                                 Activator.getDefault().getWorkbench().getDecoratorManager()
 440                                                 .update(DECORATOR_ID);
 441                         }
 442                 });
 443         }
 444
 445         /**
 446          * Callback for IPropertyChangeListener events
 447          *
 448          * If any of the relevant preferences has been changed we refresh all
 449          * decorations (all projects and their resources).
 450          *
 451          * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
 452          */
 453         public void propertyChange(PropertyChangeEvent event) {
 454                 final String prop = event.getProperty();
 455                 // If the property is of any interest to us
 456                 if (prop.equals(TeamUI.GLOBAL_IGNORES_CHANGED)
 457                                 || prop.equals(TeamUI.GLOBAL_FILE_TYPES_CHANGED)
 458                                 || prop.equals(Activator.DECORATORS_CHANGED)) {
 459                         postLabelEvent(new LabelProviderChangedEvent(this));
 460                 }
 461         }
 462
 463         /**
 464          * Callback for IResourceChangeListener events
 465          *
 466          * Schedules a refresh of the changed resource
 467          *
 468          * If the preference for computing deep dirty states has been set we walk
 469          * the ancestor tree of the changed resource and update all parents as well.
 470          *
 471          * @see org.eclipse.core.resources.IResourceChangeListener#resourceChanged(org.eclipse.core.resources.IResourceChangeEvent)
 472          */
 473         public void resourceChanged(IResourceChangeEvent event) {
 474                 final Set<IResource> resourcesToUpdate = new HashSet<IResource>();
 475
 476                 try { // Compute the changed resources by looking at the delta
 477                         event.getDelta().accept(new IResourceDeltaVisitor() {
 478                                 public boolean visit(IResourceDelta delta) throws CoreException {
 479
 480                                         // If the file has changed but not in a way that we care
 481                                         // about (e.g. marker changes to files) then ignore
 482                                         if (delta.getKind() == IResourceDelta.CHANGED
 483                                                         && (delta.getFlags() & INTERESTING_CHANGES) == 0) {
 484                                                 return true;
 485                                         }
 486
 487                                         final IResource resource = delta.getResource();
 488
 489                                         // If the resource is not part of a project under Git
 490                                         // revision control
 491                                         final RepositoryMapping mapping = RepositoryMapping
 492                                                         .getMapping(resource);
 493                                         if (mapping == null) {
 494                                                 // Ignore the change
 495                                                 return true;
 496                                         }
 497
 498                                         if (resource.getType() == IResource.ROOT) {
 499                                                 // Continue with the delta
 500                                                 return true;
 501                                         }
 502
 503                                         if (resource.getType() == IResource.PROJECT) {
 504                                                 // If the project is not accessible, don't process it
 505                                                 if (!resource.isAccessible())
 506                                                         return false;
 507                                         }
 508
 509                                         // All seems good, schedule the resource for update
 510                                         resourcesToUpdate.add(resource);
 511
 512                                         if (delta.getKind() == IResourceDelta.CHANGED
 513                                                         && (delta.getFlags() & IResourceDelta.OPEN) > 1)
 514                                                 return false; // Don't recurse when opening projects
 515                                         else
 516                                                 return true;
 517                                 }
 518                         }, true /* includePhantoms */);
 519                 } catch (final CoreException e) {
 520                         handleException(null, e);
 521                 }
 522
 523                 if (resourcesToUpdate.isEmpty())
 524                         return;
 525
 526                 // If ancestor-decoration is enabled in the preferences we walk
 527                 // the ancestor tree of each of the changed resources and add
 528                 // their parents to the update set
 529                 final IPreferenceStore store = Activator.getDefault()
 530                                 .getPreferenceStore();
 531                 if (store.getBoolean(UIPreferences.DECORATOR_RECOMPUTE_ANCESTORS)) {
 532                         final IResource[] changedResources = resourcesToUpdate
 533                                         .toArray(new IResource[resourcesToUpdate.size()]);
 534                         for (IResource current : changedResources) {
 535                                 while (current.getType() != IResource.ROOT) {
 536                                         current = current.getParent();
 537                                         resourcesToUpdate.add(current);
 538                                 }
 539                         }
 540                 }
 541
 542                 postLabelEvent(new LabelProviderChangedEvent(this, resourcesToUpdate
 543                                 .toArray()));
 544         }
 545
 546         /**
 547          * Callback for RepositoryListener events
 548          *
 549          * We resolve the repository mapping for the changed repository and forward
 550          * that to repositoryChanged(RepositoryMapping).
 551          *
 552          * @param e
 553          *            The original change event
 554          */
 555         private void repositoryChanged(RepositoryChangedEvent e) {
 556                 final Set<RepositoryMapping> ms = new HashSet<RepositoryMapping>();
 557                 for (final IProject p : ResourcesPlugin.getWorkspace().getRoot()
 558                                 .getProjects()) {
 559                         final RepositoryMapping mapping = RepositoryMapping.getMapping(p);
 560                         if (mapping != null && mapping.getRepository() == e.getRepository())
 561                                 ms.add(mapping);
 562                 }
 563                 for (final RepositoryMapping m : ms) {
 564                         repositoryChanged(m);
 565                 }
 566         }
 567
 568         /*
 569          * (non-Javadoc)
 570          *
 571          * @see
 572          * org.spearce.jgit.lib.RepositoryListener#indexChanged(org.spearce.jgit
 573          * .lib.IndexChangedEvent)
 574          */
 575         public void indexChanged(IndexChangedEvent e) {
 576                 repositoryChanged(e);
 577         }
 578
 579         /*
 580          * (non-Javadoc)
 581          *
 582          * @see
 583          * org.spearce.jgit.lib.RepositoryListener#refsChanged(org.spearce.jgit.
 584          * lib.RefsChangedEvent)
 585          */
 586         public void refsChanged(RefsChangedEvent e) {
 587                 repositoryChanged(e);
 588         }
 589
 590         /**
 591          * Callback for RepositoryChangeListener events, as well as
 592          * RepositoryListener events via repositoryChanged()
 593          *
 594          * @see org.spearce.egit.core.project.RepositoryChangeListener#repositoryChanged(org.spearce.egit.core.project.RepositoryMapping)
 595          */
 596         public void repositoryChanged(RepositoryMapping mapping) {
 597                 // Until we find a way to refresh visible labels within a project
 598                 // we have to use this blanket refresh that includes all projects.
 599                 postLabelEvent(new LabelProviderChangedEvent(this));
 600         }
 601
 602         // -------- Helper methods --------
 603
 604         private static IResource getResource(Object element) {
 605                 if (element instanceof ResourceMapping) {
 606                         element = ((ResourceMapping) element).getModelObject();
 607                 }
 608
 609                 IResource resource = null;
 610                 if (element instanceof IResource) {
 611                         resource = (IResource) element;
 612                 } else if (element instanceof IAdaptable) {
 613                         final IAdaptable adaptable = (IAdaptable) element;
 614                         resource = (IResource) adaptable.getAdapter(IResource.class);
 615                         if (resource == null) {
 616                                 final IContributorResourceAdapter adapter = (IContributorResourceAdapter) adaptable
 617                                                 .getAdapter(IContributorResourceAdapter.class);
 618                                 if (adapter != null)
 619                                         resource = adapter.getAdaptedResource(adaptable);
 620                         }
 621                 }
 622
 623                 return resource;
 624         }
 625
 626         /**
 627          * Post the label event to the UI thread
 628          *
 629          * @param event
 630          *            The event to post
 631          */
 632         private void postLabelEvent(final LabelProviderChangedEvent event) {
 633                 Display.getDefault().asyncExec(new Runnable() {
 634                         public void run() {
 635                                 fireLabelProviderChanged(event);
 636                         }
 637                 });
 638         }
 639
 640         /**
 641          * Handle exceptions that occur in the decorator. Exceptions are only logged
 642          * for resources that are accessible (i.e. exist in an open project).
 643          *
 644          * @param resource
 645          *            The resource that triggered the exception
 646          * @param e
 647          *            The exception that occurred
 648          */
 649         private static void handleException(IResource resource, CoreException e) {
 650                 if (resource == null || resource.isAccessible())
 651                         exceptions.handleException(e);
 652         }
 653 }