@Nullable
  private MPSTreeNode getNode(MPSTreeNode rootTreeNode, VirtualFile file) {
    if (rootTreeNode instanceof AbstractFileTreeNode) {
      VirtualFile nodeFile = ((AbstractFileTreeNode) rootTreeNode).getFile();

      if (nodeFile != null) {
        if (nodeFile.getUrl().equals(file.getUrl())) {
          return rootTreeNode;
        }

        if (!VfsUtil.isAncestor(nodeFile, file, false)) {
          return null;
        }
      } else {
        return null;
      }
    }

    for (MPSTreeNode node : rootTreeNode) {
      node.init();
      MPSTreeNode result = getNode(node, file);
      if (result != null) {
        return result;
      }
    }

    return null;
  }
  public Object getData(String dataId) {
    if (PlatformDataKeys.VIRTUAL_FILE_ARRAY.getName().equals(dataId)) {
      List<VirtualFile> files = new LinkedList<VirtualFile>();
      TreePath[] treePaths = getSelectionPaths();
      if (treePaths != null) {
        for (TreePath tp : treePaths) {
          Object lastPathComponent = tp.getLastPathComponent();
          if (lastPathComponent instanceof AbstractFileTreeNode) {
            AbstractFileTreeNode node = (AbstractFileTreeNode) lastPathComponent;
            VirtualFile file = node.getFile();
            if (file.isValid()) {
              files.add(file);
            }
          }
        }
      }
      return files.toArray(new VirtualFile[files.size()]);
    } else if (PlatformDataKeys.VIRTUAL_FILE.getName().equals(dataId)) {
      TreePath tp = getSelectedPath();
      if (tp == null) {
        return super.getData(dataId);
      }
      Object lastPathComponent = tp.getLastPathComponent();
      if (lastPathComponent instanceof AbstractFileTreeNode) {
        AbstractFileTreeNode node = (AbstractFileTreeNode) lastPathComponent;
        VirtualFile file = node.getFile();
        if (file.isValid()) {
          return file;
        }
      }
    } else if (PlatformDataKeys.COPY_PROVIDER.getName().equals(dataId)) {
      return new FilePaneCopyProvider();
    } else if (PlatformDataKeys.PASTE_PROVIDER.getName().equals(dataId)) {
      return new FilePanePasteProvider();
    } else if (PlatformDataKeys.CUT_PROVIDER.getName().equals(dataId)) {
      return new FilePaneCopyProvider();
    } else if (dataId.equals(MPSDataKeys.PLACE.getName())) {
      TreeNode treeNode = getSelectedTreeNode(TreeNode.class);
      if (treeNode instanceof ModuleTreeNode) {
        return ActionPlace.PROJECT_PANE_MODULE;
      } else if (treeNode instanceof FileTreeNode) {
        return ActionPlace.PROJECT_PANE_FILE;
      } else if (treeNode instanceof FolderTreeNode) {
        return ActionPlace.PROJECT_PANE_FOLDER;
      }
    }

    return super.getData(dataId);
  }