private @NotNull PsiFile checkPsiProjectConsistency(@NotNull PsiFile file) {
    if (!file.getProject().equals(getProject())) {
      Logger.getInstance(FileContentImpl.class).error("psi file's project is not equal to file content's project");
    }
    return file;
  }
private @NotNull PsiFile checkPsiProjectConsistency(@NotNull PsiFile file)