attribute.hpp File Reference

#include <fcb/generated/header_generated.h>
#include <fcb/key.hpp>
#include <nlohmann/json.hpp>
#include <cstdint>
#include <map>
#include <string>
#include <utility>
#include <vector>
#include <flatbuffers/flatbuffers.h>

Go to the source code of this file.

Classes
struct	fcb::AttributeIndexEntry
	One indexable (column, value) pair pulled out of a feature for the static B+tree builder (M6). More...

Namespaces
namespace	fcb

Typedefs
using	fcb::AttributeSchema = std::map< std::string, std::pair< std::uint16_t, ::ColumnType > >
	Attribute schema: name -> (column index, column type).

Functions
void	fcb::add_attributes (AttributeSchema &schema, const nlohmann::ordered_json &attrs)
	Adds every member of a JSON object to schema, assigning each new, non-null name the next free column index, in the order attrs's own members appear (see the ordered_json note above) – NOT alphabetically.
std::size_t	fcb::attr_size (::ColumnType coltype, const nlohmann::ordered_json &colval)
	Byte width one value of coltype occupies in the attribute blob, EXCLUDING the 2-byte column-index prefix every record also carries.
std::vector< std::uint8_t >	fcb::encode_attributes_with_schema (const nlohmann::ordered_json &attr, const AttributeSchema &schema)
	Encodes attr (a CityJSON attributes object) against schema: repeated [u16 LE column index][value] records, one per schema member present and non-null in attr, in ascending column-index order (NOT attr's own JSON key order).
::flatbuffers::Offset<::flatbuffers::Vector<::flatbuffers::Offset<::Column > > >	fcb::to_columns (::flatbuffers::FlatBufferBuilder &fbb, const AttributeSchema &schema)
	Builds the Column vector for Header.columns or CityObject.columns, in ascending column-index order.
std::vector< AttributeIndexEntry >	fcb::attribute_to_index_entries (const nlohmann::ordered_json &attr, const AttributeSchema &schema, const std::vector< std::string > &indexing_attr)
	Extracts index entries for indexing_attr from one CityJSON attributes object.
std::vector< AttributeIndexEntry >	fcb::cityfeature_to_index_entries (const nlohmann::ordered_json &city_feature, const AttributeSchema &schema, const std::vector< std::string > &indexing_attr)
	Same, over every object in one CityJSONFeature's CityObjects, visited in ascending object-id order (not JSON key order, which need not be stable) so that duplicate-key payload ordering in the eventual B+tree is reproducible.