private boolean processSelection(final Processor<? super Library> processor) {
    DefaultMutableTreeNode[] nodes = myTree.getSelectedNodes(DefaultMutableTreeNode.class, null);
    for (Object element : ContainerUtil.map(nodes, node -> ((NodeDescriptor<?>)node.getUserObject()).getElement())) {
      if (element instanceof Library) {
        if (!processor.process((Library)element)) return false;
      }
    }
    return true;
  }
private boolean processSelection(final Processor<? super Library> processor)