mutable_array_base.hpp

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// Copyright 2024 Man Group Operations Limited
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or mplied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#pragma once
 
#include "sparrow/layout/array_base.hpp"
#include "sparrow/utils/mp_utils.hpp"
 
namespace sparrow
{
    template <class D>
    class mutable_array_base : public array_crtp_base<D>
    {
    public:
 
        using self_type = mutable_array_base<D>;
        using base_type = array_crtp_base<D>;
        using derived_type = D;
        using inner_types = array_inner_types<derived_type>;
 
        using size_type = base_type::size_type;
        using difference_type = base_type::difference_type;
 
        using bitmap_type = typename inner_types::bitmap_type;
        using bitmap_reference = bitmap_type::reference;
        using bitmap_const_reference = bitmap_type::const_reference;
        using bitmap_iterator = bitmap_type::iterator;
        using bitmap_range = std::ranges::subrange<bitmap_iterator>;
        using const_bitmap_range = base_type::const_bitmap_range;
 
        using inner_value_type = typename base_type::inner_value_type;
        using value_type = typename base_type::value_type;
 
        using inner_reference = typename inner_types::inner_reference;
        using inner_const_reference = typename base_type::inner_const_reference;
 
        using reference = nullable<inner_reference, bitmap_reference>;
        using const_reference = base_type::const_reference;
 
        using value_iterator = typename inner_types::value_iterator;
 
        using iterator_tag = base_type::iterator_tag;
 
        struct iterator_types
        {
            using value_type = self_type::value_type;
            using reference = self_type::reference;
            using value_iterator = self_type::value_iterator;
            using bitmap_iterator = self_type::bitmap_iterator;
            using iterator_tag = self_type::iterator_tag;
        };
 
        using iterator = layout_iterator<iterator_types>;
        using const_iterator = base_type::const_iterator;
 
        [[nodiscard]] reference operator[](size_type i);
        using base_type::operator[];
 
        [[nodiscard]] iterator begin();
        [[nodiscard]] iterator end();
 
        using base_type::begin;
        using base_type::end;
 
        template <typename T>
        void resize(size_type new_size, const nullable<T>& value);
 
        template <typename T>
        iterator insert(const_iterator pos, const nullable<T>& value);
        template <typename T>
        iterator insert(const_iterator pos, const nullable<T>& value, size_type count);
        template <typename T>
        iterator insert(const_iterator pos, std::initializer_list<nullable<T>> values);

        template <typename InputIt>
            requires std::input_iterator<InputIt>
                     && mpl::is_type_instance_of_v<typename std::iterator_traits<InputIt>::value_type, nullable>
        iterator insert(const_iterator pos, InputIt first, InputIt last)
        {
            SPARROW_ASSERT_TRUE(pos >= this->cbegin())
            SPARROW_ASSERT_TRUE(pos <= this->cend());
            SPARROW_ASSERT_TRUE(first <= last);
            const difference_type distance = std::distance(this->cbegin(), pos);
            const auto validity_range = std::ranges::subrange(first, last)
                                        | std::views::transform(
                                            [](const auto& obj)
                                            {
                                                return obj.has_value();
                                            }
                                        );
            auto& derived = this->derived_cast();
            derived.insert_bitmap(
                sparrow::next(this->bitmap_cbegin(), distance),
                validity_range.begin(),
                validity_range.end()
            );
 
            const auto value_range = std::ranges::subrange(first, last)
                                     | std::views::transform(
                                         [](const auto& obj)
                                         {
                                             return obj.get();
                                         }
                                     );
            derived.insert_values(
                sparrow::next(derived.value_cbegin(), distance),
                value_range.begin(),
                value_range.end()
            );
            const difference_type count = std::distance(first, last);
            // The following must be done after modifying the bitmap and values
            this->get_arrow_proxy().set_length(this->size() + static_cast<size_t>(count));
 
            derived.update();
            return sparrow::next(this->begin(), distance);
        }

        template <std::ranges::input_range R>
            requires mpl::is_type_instance_of_v<std::ranges::range_value_t<R>, nullable>
        iterator insert(const_iterator pos, const R& range)
        {
            return insert(pos, std::ranges::begin(range), std::ranges::end(range));
        }
 
        iterator erase(const_iterator pos);
        iterator erase(const_iterator first, const_iterator last);
 
        template <typename T>
        void push_back(const nullable<T>& value);
        void pop_back();
 
    protected:
 
        mutable_array_base(arrow_proxy);
        mutable_array_base(const mutable_array_base&) = default;
        mutable_array_base& operator=(const mutable_array_base&) = default;
 
        mutable_array_base(mutable_array_base&&) = default;
        mutable_array_base& operator=(mutable_array_base&&) = default;
 
        [[nodiscard]] bitmap_reference has_value(size_type i);
        using base_type::has_value;
 
        [[nodiscard]] bitmap_iterator bitmap_begin();
        [[nodiscard]] bitmap_iterator bitmap_end();
 
        friend class layout_iterator<iterator_types>;
    };
 
    /*************************************
     * mutable_array_base implementation *
     *************************************/
 
    template <class D>
    mutable_array_base<D>::mutable_array_base(arrow_proxy proxy)
        : array_crtp_base<D>(std::forward<arrow_proxy>(proxy))
    {
    }

    template <class D>
    auto mutable_array_base<D>::begin() -> iterator
    {
        return iterator(this->derived_cast().value_begin(), this->derived_cast().bitmap_begin());
    }

    template <class D>
    auto mutable_array_base<D>::end() -> iterator
    {
        return iterator(this->derived_cast().value_end(), this->derived_cast().bitmap_end());
    }

    template <class D>
    auto mutable_array_base<D>::operator[](size_type i) -> reference
    {
        SPARROW_ASSERT_TRUE(i < this->size());
        return reference(inner_reference(this->derived_cast().value(i)), this->derived_cast().has_value(i));
    }
 
    template <class D>
    auto mutable_array_base<D>::has_value(size_type i) -> bitmap_reference
    {
        SPARROW_ASSERT_TRUE(i < this->size());
        return *sparrow::next(bitmap_begin(), i);
    }
 
    template <class D>
    auto mutable_array_base<D>::bitmap_begin() -> bitmap_iterator
    {
        return sparrow::next(this->derived_cast().get_bitmap().begin(), this->get_arrow_proxy().offset());
    }
 
    template <class D>
    auto mutable_array_base<D>::bitmap_end() -> bitmap_iterator
    {
        return sparrow::next(bitmap_begin(), this->size());
    }

    template <class D>
    template <typename T>
    void mutable_array_base<D>::resize(size_type new_length, const nullable<T>& value)
    {
        auto& derived = this->derived_cast();
        derived.resize_bitmap(new_length, value.has_value());
        derived.resize_values(new_length, value.get());
        this->get_arrow_proxy().set_length(new_length);  // Must be done after resizing the bitmap and values
        derived.update();
    }

    template <class D>
    template <typename T>
    auto mutable_array_base<D>::insert(const_iterator pos, const nullable<T>& value) -> iterator
    {
        return insert(pos, value, 1);
    }

    template <class D>
    template <typename T>
    auto mutable_array_base<D>::insert(const_iterator pos, const nullable<T>& value, size_type count)
        -> iterator
    {
        SPARROW_ASSERT_TRUE(pos >= this->cbegin());
        SPARROW_ASSERT_TRUE(pos <= this->cend());
        const size_t distance = static_cast<size_t>(std::distance(this->cbegin(), pos));
        auto& derived = this->derived_cast();
        derived.insert_bitmap(sparrow::next(this->bitmap_cbegin(), distance), value.has_value(), count);
        derived.insert_value(sparrow::next(derived.value_cbegin(), distance), value.get(), count);
        this->get_arrow_proxy().set_length(this->size() + count);  // Must be done after resizing the bitmap
                                                                   // and values
        derived.update();
        return sparrow::next(this->begin(), distance);
    }

    template <class D>
    template <typename T>
    auto mutable_array_base<D>::insert(const_iterator pos, std::initializer_list<nullable<T>> values)
        -> iterator
    {
        return insert(pos, values.begin(), values.end());
    }

    template <class D>
    auto mutable_array_base<D>::erase(const_iterator pos) -> iterator
    {
        SPARROW_ASSERT_TRUE(this->cbegin() <= pos)
        SPARROW_ASSERT_TRUE(pos < this->cend());
        return erase(pos, pos + 1);
    }

    template <class D>
    auto mutable_array_base<D>::erase(const_iterator first, const_iterator last) -> iterator
    {
        SPARROW_ASSERT_TRUE(first < last);
        SPARROW_ASSERT_TRUE(this->cbegin() <= first)
        SPARROW_ASSERT_TRUE(last <= this->cend());
        const difference_type first_index = std::distance(this->cbegin(), first);
        if (first == last)
        {
            return sparrow::next(begin(), first_index);
        }
        const auto count = static_cast<size_t>(std::distance(first, last));
        auto& derived = this->derived_cast();
        derived.erase_bitmap(sparrow::next(this->bitmap_cbegin(), first_index), count);
        derived.erase_values(sparrow::next(derived.value_cbegin(), first_index), count);
        this->get_arrow_proxy().set_length(this->size() - count);  // Must be done after modifying the bitmap
                                                                   // and values
        derived.update();
        return sparrow::next(begin(), first_index);
    }

    template <class D>
    template <typename T>
    void mutable_array_base<D>::push_back(const nullable<T>& value)
    {
        insert(this->cend(), value);
    }

    template <class D>
    void mutable_array_base<D>::pop_back()
    {
        erase(std::prev(this->cend()));
    }
}