@Override
  public void addAssociation(PsiFile file, PsiFile assoc) {
    final VirtualFile virtualFile = assoc.getVirtualFile();
    if (virtualFile == null) {
      LOG.warn("No VirtualFile for " + file.getName());
      return;
    }
    addAssociation(file, virtualFile);
  }
@Override
  public void addAssociation(PsiFile file, PsiFile assoc)