Function IsDirectory

cpp/src/arrow/filesystem/s3fs.cc:1394–1413

}

bool IsDirectory(std::string_view key, const S3Model::HeadObjectResult& result) {
  // If it has a non-zero length, it's a regular file. We do this even if
  // the key has a trailing slash, as directory markers should never have
  // any data associated to them.
  if (result.GetContentLength() > 0) {
    return false;
  }
  // Otherwise, if it has a trailing slash, it's a directory
  if (internal::HasTrailingSlash(key)) {
    return true;
  }
  // Otherwise, if its content type starts with "application/x-directory",
  // it's a directory
  if (result.GetContentType().starts_with(kAwsDirectoryContentType)) {
    return true;
  }

  // Otherwise, it's a regular file.
  return false;
}

// A RandomAccessFile that reads from a S3 object
class ObjectInputFile final : public io::RandomAccessFile {