seek()

bool MayaFlux::IO::DelimitedTextReader::seek ( const std::vector< uint64_t > &  position )

overridevirtual

Seek to a zero-based data record by replaying from the first.

Parameters

position

One record index.

Returns

False for an invalid or out-of-range position.

Note

On an out-of-range position, the reader is left at the end of file (get_read_position() reflects how far the replay reached, and subsequent read_next() calls return an empty array), not at an undefined position.

Implements MayaFlux::IO::FileReader.

Definition at line 375 of file DelimitedTextReader.cpp.

{
    if (!is_open() || position.size() != 1) {
        m_last_error = "Seek requires one record position in an open file";
        return false;
    }
    m_file.clear();
    m_file.seekg(m_data_start);
    m_row_position = 0;
    m_at_end = false;
 
    std::vector<ParsedField> fields;
 
    while (m_row_position < position[0]) {
        bool at_end = false;
 
        if (!read_record(fields, at_end))
            return false;
 
        if (at_end) {
            m_at_end = true;
            m_last_error = "Seek position is past the end of the file";
            return false;
        }
 
        ++m_row_position;
    }
 
    m_last_error.clear();
    return true;
}

References MayaFlux::Kakshya::CompositeArray::clear(), is_open(), m_at_end, m_data_start, m_file, MayaFlux::IO::CompositeReader::m_last_error, m_row_position, position, and read_record().

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