object.hpp

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#ifndef OSMIUM_OSM_OBJECT_HPP
#define OSMIUM_OSM_OBJECT_HPP
 
/*
 
This file is part of Osmium (https://osmcode.org/libosmium).
 
Copyright 2013-2021 Jochen Topf <jochen@topf.org> and others (see README).
 
Boost Software License - Version 1.0 - August 17th, 2003
 
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
 
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
 
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, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
 
*/
 
#include <osmium/memory/collection.hpp>
#include <osmium/memory/item.hpp>
#include <osmium/memory/item_iterator.hpp>
#include <osmium/osm/entity.hpp>
#include <osmium/osm/item_type.hpp>
#include <osmium/osm/location.hpp>
#include <osmium/osm/tag.hpp>
#include <osmium/osm/timestamp.hpp>
#include <osmium/osm/types.hpp>
#include <osmium/osm/types_from_string.hpp>
#include <osmium/util/misc.hpp>
 
#include <cstdlib>
#include <cstring>
#include <stdexcept>
#include <tuple>
#include <type_traits>
 
namespace osmium {
 
    namespace builder {
        template <typename TDerived, typename T>
        class OSMObjectBuilder;
    } // namespace builder
 
    class OSMObject : public osmium::OSMEntity {
 
        template <typename TDerived, typename T>
        friend class osmium::builder::OSMObjectBuilder;
 
        object_id_type      m_id = 0;
        bool                m_deleted : 1;
        object_version_type m_version : 31;
        osmium::Timestamp   m_timestamp{};
        user_id_type        m_uid = 0;
        changeset_id_type   m_changeset = 0;
 
        size_t sizeof_object() const noexcept {
            return sizeof(OSMObject) + (type() == item_type::node ? sizeof(osmium::Location) : 0) + sizeof(string_size_type);
        }
 
        unsigned char* user_position() noexcept {
            return data() + sizeof_object() - sizeof(string_size_type);
        }
 
        const unsigned char* user_position() const noexcept {
            return data() + sizeof_object() - sizeof(string_size_type);
        }
 
        string_size_type user_size() const noexcept {
            return *reinterpret_cast<const string_size_type*>(user_position());
        }
 
        unsigned char* subitems_position() {
            return data() + osmium::memory::padded_length(sizeof_object() + user_size());
        }
 
        const unsigned char* subitems_position() const {
            return data() + osmium::memory::padded_length(sizeof_object() + user_size());
        }
 
    protected:
 
        OSMObject(osmium::memory::item_size_type size, osmium::item_type type) :
            OSMEntity(size, type),
            m_deleted(false),
            m_version(0) {
        }
 
        void set_user_size(string_size_type size) {
            *reinterpret_cast<string_size_type*>(user_position()) = size;
        }
 
    public:
 
        constexpr static bool is_compatible_to(osmium::item_type t) noexcept {
            return t == osmium::item_type::node ||
                   t == osmium::item_type::way ||
                   t == osmium::item_type::relation ||
                   t == osmium::item_type::area;
        }
 
        object_id_type id() const noexcept {
            return m_id;
        }
 
        unsigned_object_id_type positive_id() const noexcept {
            return static_cast<unsigned_object_id_type>(std::abs(m_id));
        }
 
        OSMObject& set_id(object_id_type id) noexcept {
            m_id = id;
            return *this;
        }
 
        OSMObject& set_id(const char* id) {
            return set_id(osmium::string_to_object_id(id));
        }
 
        bool deleted() const noexcept {
            return m_deleted;
        }
 
        bool visible() const noexcept {
            return !deleted();
        }
 
        OSMObject& set_deleted(bool deleted) noexcept {
            m_deleted = deleted;
            return *this;
        }
 
        OSMObject& set_visible(bool visible) noexcept {
            m_deleted = !visible;
            return *this;
        }
 
        OSMObject& set_visible(const char* visible) {
            if (!std::strcmp("true", visible)) {
                set_visible(true);
            } else if (!std::strcmp("false", visible)) {
                set_visible(false);
            } else {
                throw std::invalid_argument{"Unknown value for visible attribute (allowed is 'true' or 'false')"};
            }
            return *this;
        }
 
        object_version_type version() const noexcept {
            return m_version;
        }
 
        OSMObject& set_version(object_version_type version) noexcept {
            m_version = version;
            return *this;
        }
 
        OSMObject& set_version(const char* version) {
            return set_version(string_to_object_version(version));
        }
 
        changeset_id_type changeset() const noexcept {
            return m_changeset;
        }
 
        OSMObject& set_changeset(changeset_id_type changeset) noexcept {
            m_changeset = changeset;
            return *this;
        }
 
        OSMObject& set_changeset(const char* changeset) {
            return set_changeset(string_to_changeset_id(changeset));
        }
 
        user_id_type uid() const noexcept {
            return m_uid;
        }
 
        OSMObject& set_uid(user_id_type uid) noexcept {
            m_uid = uid;
            return *this;
        }
 
        OSMObject& set_uid_from_signed(signed_user_id_type uid) noexcept {
            m_uid = uid < 0 ? 0 : static_cast<user_id_type>(uid);
            return *this;
        }
 
        OSMObject& set_uid(const char* uid) {
            m_uid = string_to_uid(uid);
            return *this;
        }
 
        bool user_is_anonymous() const noexcept {
            return m_uid == 0;
        }
 
        osmium::Timestamp timestamp() const noexcept {
            return m_timestamp;
        }
 
        OSMObject& set_timestamp(const osmium::Timestamp& timestamp) noexcept {
            m_timestamp = timestamp;
            return *this;
        }
 
        OSMObject& set_timestamp(const char* timestamp) {
            assert(timestamp);
            m_timestamp = detail::parse_timestamp(timestamp);
            if (timestamp[20] != '\0') {
                throw std::invalid_argument{"can not parse timestamp: garbage after timestamp"};
            }
            return *this;
        }
 
        const char* user() const noexcept {
            return reinterpret_cast<const char*>(data() + sizeof_object());
        }
 
        void clear_user() noexcept {
            std::memset(data() + sizeof_object(), 0, user_size());
        }
 
        const TagList& tags() const {
            return osmium::detail::subitem_of_type<const TagList>(cbegin(), cend());
        }
 
        const char* get_value_by_key(const char* key, const char* default_value = nullptr) const noexcept {
            return tags().get_value_by_key(key, default_value);
        }
 
        OSMObject& set_attribute(const char* attr, const char* value) {
            if (!std::strcmp(attr, "id")) {
                set_id(value);
            } else if (!std::strcmp(attr, "version")) {
                set_version(value);
            } else if (!std::strcmp(attr, "changeset")) {
                set_changeset(value);
            } else if (!std::strcmp(attr, "timestamp")) {
                set_timestamp(value);
            } else if (!std::strcmp(attr, "uid")) {
                set_uid(value);
            } else if (!std::strcmp(attr, "visible")) {
                set_visible(value);
            }
 
            return *this;
        }
 
        using iterator       = osmium::memory::CollectionIterator<Item>;
        using const_iterator = osmium::memory::CollectionIterator<const Item>;
 
        void remove_tags() noexcept {
            for (auto& subitem : *this) {
                if (subitem.type() == osmium::item_type::tag_list) {
                    subitem.set_removed(true);
                }
            }
        }
 
        iterator begin() {
            return iterator(subitems_position());
        }
 
        iterator end() {
            return iterator(next());
        }
 
        const_iterator cbegin() const {
            return const_iterator(subitems_position());
        }
 
        const_iterator cend() const {
            return const_iterator(next());
        }
 
        const_iterator begin() const {
            return cbegin();
        }
 
        const_iterator end() const {
            return cend();
        }
 
        template <typename T>
        osmium::memory::ItemIteratorRange<T> subitems() {
            return osmium::memory::ItemIteratorRange<T>{subitems_position(), next()};
        }
 
        template <typename T>
        osmium::memory::ItemIteratorRange<const T> subitems() const {
            return osmium::memory::ItemIteratorRange<const T>{subitems_position(), next()};
        }
 
        template <typename T>
        using t_iterator = osmium::memory::ItemIterator<T>;
 
        template <typename T>
        using t_const_iterator = osmium::memory::ItemIterator<const T>;
 
        template <typename T>
        t_iterator<T> begin() {
            return t_iterator<T>(subitems_position(), next());
        }
 
        template <typename T>
        t_iterator<T> end() {
            return t_iterator<T>(next(), next());
        }
 
        template <typename T>
        t_const_iterator<T> cbegin() const {
            return t_const_iterator<T>(subitems_position(), next());
        }
 
        template <typename T>
        t_const_iterator<T> cend() const {
            return t_const_iterator<T>(next(), next());
        }
 
        template <typename T>
        t_const_iterator<T> begin() const {
            return cbegin<T>();
        }
 
        template <typename T>
        t_const_iterator<T> end() const {
            return cend<T>();
        }
 
    }; // class OSMObject
 
 
    inline bool operator==(const OSMObject& lhs, const OSMObject& rhs) noexcept {
        return lhs.type()    == rhs.type() &&
               lhs.id()      == rhs.id()   &&
               lhs.version() == rhs.version();
    }
 
    inline bool operator!=(const OSMObject& lhs, const OSMObject& rhs) noexcept {
        return !(lhs == rhs);
    }
 
    inline bool operator<(const OSMObject& lhs, const OSMObject& rhs) noexcept {
        return const_tie(lhs.type(), lhs.id() > 0, lhs.positive_id(), lhs.version(),
                   ((lhs.timestamp().valid() && rhs.timestamp().valid()) ? lhs.timestamp() : osmium::Timestamp())) <
               const_tie(rhs.type(), rhs.id() > 0, rhs.positive_id(), rhs.version(),
                   ((lhs.timestamp().valid() && rhs.timestamp().valid()) ? rhs.timestamp() : osmium::Timestamp()));
    }
 
    inline bool operator>(const OSMObject& lhs, const OSMObject& rhs) noexcept {
        return rhs < lhs;
    }
 
    inline bool operator<=(const OSMObject& lhs, const OSMObject& rhs) noexcept {
        return !(rhs < lhs);
    }
 
    inline bool operator>=(const OSMObject& lhs, const OSMObject& rhs) noexcept {
        return !(lhs < rhs);
    }
 
} // namespace osmium
 
#endif // OSMIUM_OSM_OBJECT_HPP