private void addLibraryFile(LibraryId id, VirtualFile file, boolean isSource) {
      if (isSource) {
        sourceFilesFromLibraries.putValue(id, file);
      }
      else {
        classFilesFromLibraries.putValue(id, file);
      }
    }
private void addLibraryFile(LibraryId id, VirtualFile file, boolean isSource)