private void calculateRoots() {
    final ModuleManager moduleManager = ModuleManager.getInstance(myProject);
    // assertion for read access inside
    final Module[] modules =
        ApplicationManager.getApplication()
            .runReadAction(
                new Computable<Module[]>() {
                  public Module[] compute() {
                    return moduleManager.getModules();
                  }
                });

    final TreeSet<VirtualFile> checkSet =
        new TreeSet<VirtualFile>(FilePathComparator.getInstance());
    myRoots = new HashSet<VirtualFile>();
    myRoots.addAll(myInitialRoots);
    checkSet.addAll(myInitialRoots);
    for (Module module : modules) {
      final VirtualFile[] files = ModuleRootManager.getInstance(module).getContentRoots();
      for (VirtualFile file : files) {
        final VirtualFile floor = checkSet.floor(file);
        if (floor != null) {
          myModulesSet.put(file, module.getName());
          myRoots.add(file);
        }
      }
    }
  }
 private void updateRightTreeModel() {
   Set<PsiFile> deps = new HashSet<PsiFile>();
   Set<PsiFile> scope = getSelectedScope(myLeftTree);
   myIllegalsInRightTree = new HashSet<PsiFile>();
   for (PsiFile psiFile : scope) {
     Map<DependencyRule, Set<PsiFile>> illegalDeps = myIllegalDependencies.get(psiFile);
     if (illegalDeps != null) {
       for (final DependencyRule rule : illegalDeps.keySet()) {
         myIllegalsInRightTree.addAll(illegalDeps.get(rule));
       }
     }
     final Set<PsiFile> psiFiles = myDependencies.get(psiFile);
     if (psiFiles != null) {
       for (PsiFile file : psiFiles) {
         if (file != null && file.isValid()) {
           deps.add(file);
         }
       }
     }
   }
   deps.removeAll(scope);
   myRightTreeExpansionMonitor.freeze();
   myRightTree.setModel(buildTreeModel(deps, myRightTreeMarker));
   myRightTreeExpansionMonitor.restore();
   expandFirstLevel(myRightTree);
 }
 @NotNull
 public static List<GotoRelatedItem> collectRelatedItems(
     @NotNull PsiElement contextElement, @Nullable DataContext dataContext) {
   Set<GotoRelatedItem> items = ContainerUtil.newLinkedHashSet();
   for (GotoRelatedProvider provider : Extensions.getExtensions(GotoRelatedProvider.EP_NAME)) {
     items.addAll(provider.getItems(contextElement));
     if (dataContext != null) {
       items.addAll(provider.getItems(dataContext));
     }
   }
   GotoRelatedItem[] result = items.toArray(new GotoRelatedItem[items.size()]);
   Arrays.sort(
       result,
       (i1, i2) -> {
         String o1 = i1.getGroup();
         String o2 = i2.getGroup();
         return StringUtil.isEmpty(o1) ? 1 : StringUtil.isEmpty(o2) ? -1 : o1.compareTo(o2);
       });
   return Arrays.asList(result);
 }