RowSet.h

/*
 * MIT License
 *
 * Copyright (c) 2026 F.D.Castel
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
 
#ifndef FBCPP_ROWSET_H
#define FBCPP_ROWSET_H
 
#include "fb-cpp-export.h"
#include "fb-api.h"
#include "Row.h"
#include "SmartPtrs.h"
#include "NumericConverter.h"
#include "CalendarConverter.h"
#include "Descriptor.h"
#include "Exception.h"
#include <cassert>
#include <cstddef>
#include <span>
#include <vector>
 
 
namespace fbcpp
{
    class Statement;
 
    class FB_CPP_EXPORT RowSet final
    {
 
    public:
        explicit RowSet(Statement& statement, unsigned maxRows);
 
        RowSet(RowSet&& o) noexcept
            : client{o.client},
              count{o.count},
              messageLength{o.messageLength},
              buffer{std::move(o.buffer)},
              descriptors{std::move(o.descriptors)},
              statusWrapper{std::move(o.statusWrapper)},
              numericConverter{std::move(o.numericConverter)},
              calendarConverter{std::move(o.calendarConverter)}
        {
            o.count = 0;
            o.messageLength = 0;
        }
 
        RowSet& operator=(RowSet&& o) noexcept
        {
            if (this != &o)
            {
                client = o.client;
                count = o.count;
                messageLength = o.messageLength;
                buffer = std::move(o.buffer);
                descriptors = std::move(o.descriptors);
                statusWrapper = std::move(o.statusWrapper);
                numericConverter = std::move(o.numericConverter);
                calendarConverter = std::move(o.calendarConverter);
                o.count = 0;
                o.messageLength = 0;
            }
 
            return *this;
        }
 
        RowSet(const RowSet&) = delete;
        RowSet& operator=(const RowSet&) = delete;
 
    public:
        unsigned getCount() const noexcept
        {
            return count;
        }
 
        unsigned getMessageLength() const noexcept
        {
            return messageLength;
        }
 
        Row getRow(unsigned index)
        {
            assert(index < count);
            return Row{*client, descriptors, getRawRow(index)};
        }
 
        std::span<const std::byte> getRawRow(unsigned index) const
        {
            assert(index < count);
            const auto* data = buffer.data() + static_cast<std::size_t>(index) * messageLength;
            return {data, messageLength};
        }
 
        const std::vector<std::byte>& getRawBuffer() const noexcept
        {
            return buffer;
        }
 
    private:
        Client* client;
        unsigned count = 0;
        unsigned messageLength = 0;
        std::vector<std::byte> buffer;
        std::vector<Descriptor> descriptors;
        impl::StatusWrapper statusWrapper;
        impl::NumericConverter numericConverter;
        impl::CalendarConverter calendarConverter;
    };
}  // namespace fbcpp
 
#endif  // FBCPP_ROWSET_H