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);
  }
  public Object getData(String dataId) {
    // MPSDK
    if (dataId.equals(MPSDataKeys.NODE.getName())) return getSelectedSNode();
    if (dataId.equals(MPSDataKeys.NODES.getName())) return getSelectedSNodes();

    if (dataId.equals(MPSDataKeys.MODEL.getName())) return getSelectedModel();
    if (dataId.equals(MPSDataKeys.CONTEXT_MODEL.getName())) return getContextModel();
    if (dataId.equals(MPSDataKeys.MODELS.getName())) return getSelectedModels();

    if (dataId.equals(MPSDataKeys.MODULE.getName())) return getSelectedModule();
    if (dataId.equals(MPSDataKeys.CONTEXT_MODULE.getName())) return getContextModule();
    if (dataId.equals(MPSDataKeys.MODULES.getName())) return getSelectedModules();

    if (dataId.equals(MPSDataKeys.VIRTUAL_PACKAGE.getName())) {
      List<String> selectedPackages = getSelectedPackages();
      if (selectedPackages.size() != 1) return null;
      return selectedPackages.get(0);
    }
    if (dataId.equals(MPSDataKeys.VIRTUAL_PACKAGES.getName())) return getSelectedPackages();

    if (dataId.equals(MPSDataKeys.NAMESPACE.getName())) {
      NamespaceTextNode selectedNamespaceNode = getSelectedTreeNode(NamespaceTextNode.class);
      if (selectedNamespaceNode != null) {
        return selectedNamespaceNode.getNamespace();
      }
      return null;
    }

    if (dataId.equals(MPSDataKeys.OPERATION_CONTEXT.getName())) return getContextForSelection();
    if (dataId.equals(MPSDataKeys.LOGICAL_VIEW_NODE.getName()))
      return getSelectedTreeNode(TreeNode.class);
    if (dataId.equals(MPSDataKeys.LOGICAL_VIEW_NODES.getName()))
      return getSelectedTreeNodes(TreeNode.class);
    if (dataId.equals(MPSDataKeys.LOGICAL_VIEW_SELECTION_SIZE.getName())) return getSelectionSize();
    if (dataId.equals(MPSDataKeys.PLACE.getName())) return getPlace();

    // PDK
    if (dataId.equals(PlatformDataKeys.COPY_PROVIDER.getName())) return new MyCopyProvider();
    if (dataId.equals(PlatformDataKeys.PASTE_PROVIDER.getName())) return new MyPasteProvider();
    if (dataId.equals(PlatformDataKeys.CUT_PROVIDER.getName())) return new MyCutProvider();
    if (dataId.equals(PlatformDataKeys.VIRTUAL_FILE_ARRAY.getName())) return getSelectedFiles();

    // not found
    return null;
  }