get_metadata()

std::optional< FileMetadata > MayaFlux::IO::DelimitedTextReader::get_metadata ( ) const

overridevirtual

File metadata and ordered field names, when open.

Implements MayaFlux::IO::FileReader.

Definition at line 312 of file DelimitedTextReader.cpp.

{
    if (!is_open() || !m_layout)
        return std::nullopt;
 
    FileMetadata metadata;
    metadata.format = m_active_delimiter == '\t' ? "tsv" : "csv";
    metadata.mime_type = m_active_delimiter == '\t'
        ? "text/tab-separated-values"
        : "text/csv";
 
    std::error_code error;
    metadata.file_size = std::filesystem::file_size(m_filepath, error);
    if (error)
        metadata.file_size = 0;
 
    std::vector<std::string> names;
    names.reserve(m_layout->fields().size());
    for (const auto& field : m_layout->fields())
        names.push_back(field.name);
 
    metadata.attributes.emplace("fields", std::move(names));
    return metadata;
}

References MayaFlux::IO::FileMetadata::format, is_open(), m_active_delimiter, m_filepath, m_layout, and metadata.

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