Struct MemObjectIdMapping 

pub struct MemObjectIdMapping { /* private fields */ }

Maintains a mapping between RDF terms and object IDs in memory.

The mapping happens on two levels: first, all strings are interned, second, the encoded term that refers to the interned strings is mapped to an encoded Object ID.

Object IDs

The encoded Object ID is a 32-bit unsigned integer used to uniquely identify RDF terms. Currently, we simply use a counter to allocate new object IDs.

Typed Values

In addition to mapping object ids to terms, we also maintain a mapping to the typed value to speed-up queries working on typed values.

Implementations

impl MemObjectIdMapping

pub fn new() -> MemObjectIdMapping

Creates a new empty MemObjectIdMapping.

The given encodings are used for creating the outputs of the mapping.

Trait Implementations

impl Debug for MemObjectIdMapping

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for MemObjectIdMapping

fn default() -> MemObjectIdMapping

Returns the “default value” for a type.

impl ObjectIdMapping for MemObjectIdMapping

fn encoding(&self) -> ObjectIdEncoding

Returns the encoding.

fn try_get_object_id( &self, scalar: &PlainTermScalar, ) -> Result<Option<ObjectIdScalar>, ObjectIdMappingError>

Try to retrieve the object id of the given scalar.

fn encode_array( &self, array: &PlainTermArray, ) -> Result<ObjectIdArray, ObjectIdMappingError>

Encodings the entire array as an ObjectIdArray. Automatically creates a mapping for a fresh object id if a term is not yet mapped.

fn decode_array( &self, array: &ObjectIdArray, ) -> Result<PlainTermArray, ObjectIdMappingError>

Decodes the entire array as a PlainTermArray.

fn decode_array_to_typed_value( &self, array: &ObjectIdArray, ) -> Result<TypedValueArray, ObjectIdMappingError>

Decodes the entire array as a TypedValueArray.

fn encode_scalar( &self, scalar: &PlainTermScalar, ) -> Result<ObjectIdScalar, ObjectIdMappingError>

Encodes a single scalar as an ObjectIdScalar. Automatically creates a mapping for a fresh object id if the term is not yet mapped.

fn decode_scalar( &self, scalar: &ObjectIdScalar, ) -> Result<PlainTermScalar, ObjectIdMappingError>

Decodes a single scalar as a PlainTermScalar.

fn decode_scalar_to_typed_value( &self, scalar: &ObjectIdScalar, ) -> Result<TypedValueScalar, ObjectIdMappingError>

Decodes a single scalar as a TypedValueScalar.