public void readExternal(Element parentNode) throws InvalidDataException {
    myDisabledHintsFiles.clear();

    Element element = parentNode.getChild(DISABLE_HINTS_TAG);
    if (element != null) {
      for (Object o : element.getChildren(FILE_TAG)) {
        Element e = (Element) o;

        String url = e.getAttributeValue(URL_ATT);
        if (url != null) {
          VirtualFile file = VirtualFileManager.getInstance().findFileByUrl(url);
          if (file != null) {
            myDisabledHintsFiles.add(file);
          }
        }
      }
    }
  }
 public void resetImportHintsEnabledForProject() {
   myDisabledHintsFiles.clear();
 }