@Override
 public Object[] getDirectoryCachedValueDependencies(PsiPackage psiPackage) {
   return new Object[] {
     PsiModificationTracker.OUT_OF_CODE_BLOCK_MODIFICATION_COUNT,
     ProjectRootManager.getInstance(psiPackage.getProject())
   };
 }
  private static PsiDirectory[] suggestMostAppropriateDirectories(PsiPackage psiPackage) {
    final Project project = psiPackage.getProject();
    PsiDirectory[] directories = null;
    final Editor editor = FileEditorManager.getInstance(project).getSelectedTextEditor();
    if (editor != null) {
      final Document document = editor.getDocument();
      final PsiFile psiFile = PsiDocumentManager.getInstance(project).getPsiFile(document);
      if (psiFile != null) {
        final Module module = ModuleUtil.findModuleForPsiElement(psiFile);
        if (module != null) {
          directories =
              psiPackage.getDirectories(GlobalSearchScope.moduleWithDependenciesScope(module));
        } else {
          directories =
              psiPackage.getDirectories(
                  GlobalSearchScope.notScope(GlobalSearchScope.projectScope(project)));
        }
      }
    }

    if (directories == null || directories.length == 0) {
      directories = psiPackage.getDirectories();
    }
    return directories;
  }
 @Override
 public void navigate(final PsiPackage psiPackage, final boolean requestFocus) {
   final Project project = psiPackage.getProject();
   ToolWindow window =
       ToolWindowManager.getInstance(project).getToolWindow(ToolWindowId.PROJECT_VIEW);
   window.activate(null);
   window
       .getActivation()
       .doWhenDone(
           new Runnable() {
             @Override
             public void run() {
               final ProjectView projectView = ProjectView.getInstance(project);
               PsiDirectory[] directories = suggestMostAppropriateDirectories(psiPackage);
               if (directories.length == 0) return;
               projectView.select(directories[0], directories[0].getVirtualFile(), requestFocus);
             }
           });
 }
  @Override
  public void handleQualifiedNameChange(
      final PsiPackage psiPackage, final String newQualifiedName) {
    ApplicationManager.getApplication().assertWriteAccessAllowed();
    final String oldQualifedName = psiPackage.getQualifiedName();
    final boolean anyChanged = changePackagePrefixes(psiPackage, oldQualifedName, newQualifiedName);
    if (anyChanged) {
      UndoManager.getInstance(psiPackage.getProject())
          .undoableActionPerformed(
              new GlobalUndoableAction() {
                @Override
                public void undo() {
                  changePackagePrefixes(psiPackage, newQualifiedName, oldQualifedName);
                }

                @Override
                public void redo() {
                  changePackagePrefixes(psiPackage, oldQualifedName, newQualifiedName);
                }
              });
    }
  }
  private static boolean changePackagePrefixes(
      PsiPackage psiPackage, final String oldQualifiedName, final String newQualifiedName) {
    final Module[] modules = ModuleManager.getInstance(psiPackage.getProject()).getModules();
    List<ModifiableRootModel> modelsToCommit = new ArrayList<ModifiableRootModel>();
    for (final Module module : modules) {
      boolean anyChange = false;
      final ModifiableRootModel rootModel =
          ModuleRootManager.getInstance(module).getModifiableModel();
      for (final ContentEntry contentEntry : rootModel.getContentEntries()) {
        for (final SourceFolder sourceFolder :
            contentEntry.getSourceFolders(JavaModuleSourceRootTypes.SOURCES)) {
          final String packagePrefix = sourceFolder.getPackagePrefix();
          if (packagePrefix.startsWith(oldQualifiedName)) {
            sourceFolder.setPackagePrefix(
                newQualifiedName + packagePrefix.substring(oldQualifiedName.length()));
            anyChange = true;
          }
        }
      }
      if (anyChange) {
        modelsToCommit.add(rootModel);
      } else {
        rootModel.dispose();
      }
    }

    if (!modelsToCommit.isEmpty()) {
      ModifiableRootModel[] rootModels =
          modelsToCommit.toArray(new ModifiableRootModel[modelsToCommit.size()]);
      if (rootModels.length > 0) {
        ModifiableModelCommitter.multiCommit(
            rootModels, ModuleManager.getInstance(rootModels[0].getProject()).getModifiableModel());
      }
      return true;
    } else {
      return false;
    }
  }
  @Override
  public VirtualFile[] occursInPackagePrefixes(PsiPackage psiPackage) {
    List<VirtualFile> result = new ArrayList<VirtualFile>();
    final Module[] modules = ModuleManager.getInstance(psiPackage.getProject()).getModules();

    for (final Module module : modules) {
      for (final ContentEntry contentEntry :
          ModuleRootManager.getInstance(module).getContentEntries()) {
        final List<SourceFolder> sourceFolders =
            contentEntry.getSourceFolders(JavaModuleSourceRootTypes.SOURCES);
        for (final SourceFolder sourceFolder : sourceFolders) {
          final String packagePrefix = sourceFolder.getPackagePrefix();
          if (packagePrefix.startsWith(psiPackage.getQualifiedName())) {
            final VirtualFile file = sourceFolder.getFile();
            if (file != null) {
              result.add(file);
            }
          }
        }
      }
    }

    return VfsUtil.toVirtualFileArray(result);
  }
 @Override
 public GlobalSearchScope adjustAllScope(
     PsiPackage psiPackage, GlobalSearchScope globalSearchScope) {
   return NonClasspathClassFinder.addNonClasspathScope(psiPackage.getProject(), globalSearchScope);
 }
 @Override
 public boolean packagePrefixExists(PsiPackage psiPackage) {
   return PackagePrefixElementFinder.getInstance(psiPackage.getProject())
       .packagePrefixExists(psiPackage.getQualifiedName());
 }