@Nullable
    private LibraryTableModifiableModelProvider getProvider(LibraryLevel libraryLevel) {
      if (libraryLevel == LibraryLevel.PROJECT) {
        return myContext.getProjectLibrariesProvider();
      }
      else if (libraryLevel == LibraryLevel.GLOBAL) {
        return myContext.getGlobalLibrariesProvider();
      }
      else {
        return null;
      }
    }
@Nullable
    private LibraryTableModifiableModelProvider getProvider(LibraryLevel libraryLevel)