Method getNext

3rdparty/qtcsv/sources/contentiterator.cpp:44–88

Get next chunk of information @output: - QString - next chunk of information. If there is no more information to return, function will return empty string

// - QString - next chunk of information. If there is no more information to
// return, function will return empty string
QString ContentIterator::getNext() {
    // Check if we have already get to the end of the content
    if (m_atEnd) { return {}; }

    QString content;
    qsizetype rowsNumber = 0;

    // Initially m_dataRow have negative value. Negative value indicates that
    // client have called this function first time. In this case at the
    // beginning of the chunk we should place header information. And then
    // set m_dataRow to the index of the first row in main data container.
    if (m_dataRow < 0) {
        if (!m_header.isEmpty()) {
            content.append(composeRow(m_header));
            ++rowsNumber;
        }

        m_dataRow = 0;
    }

    // Check if m_dataRow is less than number of rows in m_data. If this is
    // true, add information from the m_data to the chunk. Otherwise, this means
    // that we already have passed all information from the m_data.
    if (m_dataRow < m_data.rowCount()) {
        const auto endRow =
            qMin(m_dataRow + m_chunkSize - rowsNumber, m_data.rowCount());
        for (auto i = m_dataRow; i < endRow; ++i, ++m_dataRow, ++rowsNumber) {
            content.append(composeRow(m_data.rowValues(i)));
        }
    }

    // If we still have place in chunk, try to add footer information to it.
    if (rowsNumber < m_chunkSize) {
        if (!m_footer.isEmpty()) {
            content.append(composeRow(m_footer));
            ++rowsNumber;
        }

        // At this point chunk contains the last row - footer. That
        // means that we get to the end of content.
        m_atEnd = true;
    }

    return content;
}

// Compose row string from values
// @input: