Struct InMemoryDataset 

pub struct InMemoryDataset { /* private fields */ }

In-memory dataset implementation for testing.

Each stored triple carries an optional graph label: None places it in the default graph, Some(iri) in the named graph iri. This lets the in-memory dataset exercise GRAPH / FROM scoping without a backing quad store.

Implementations

impl InMemoryDataset

pub fn new() -> Self

pub fn add_triple( &mut self, subject: AlgebraTerm, predicate: AlgebraTerm, object: AlgebraTerm, )

Add a triple to the default graph.

pub fn add_triple_in_graph( &mut self, graph: NamedNode, subject: AlgebraTerm, predicate: AlgebraTerm, object: AlgebraTerm, )

Add a triple to the named graph graph.

pub fn from_triples( triples: Vec<(AlgebraTerm, AlgebraTerm, AlgebraTerm)>, ) -> Self

Build a default-graph-only dataset from a list of triples.

Trait Implementations

impl Clone for InMemoryDataset

fn clone(&self) -> InMemoryDataset

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Dataset for InMemoryDataset

fn find_triples( &self, pattern: &TriplePattern, ) -> Result<Vec<(AlgebraTerm, AlgebraTerm, AlgebraTerm)>>

Find all triples matching the given pattern in the dataset’s active default graph.

fn find_triples_in( &self, selector: &GraphSelector, pattern: &TriplePattern, ) -> Result<Vec<(AlgebraTerm, AlgebraTerm, AlgebraTerm)>>

Find all triples matching pattern within the graph selected by selector.

fn has_graph_support(&self) -> bool

Whether this dataset can honor graph-scoped access (Dataset::find_triples_in) and named-graph enumeration (Dataset::named_graphs).

fn named_graphs(&self) -> Result<Vec<AlgebraTerm>>

Enumerate the named graphs visible in this dataset, as Term::Iri values, for GRAPH ?g evaluation.

fn contains_triple( &self, subject: &AlgebraTerm, predicate: &AlgebraTerm, object: &AlgebraTerm, ) -> Result<bool>

Check if a triple exists in the dataset

fn subjects(&self) -> Result<Vec<AlgebraTerm>>

Get all subjects in the dataset

fn predicates(&self) -> Result<Vec<AlgebraTerm>>

Get all predicates in the dataset

fn objects(&self) -> Result<Vec<AlgebraTerm>>

Get all objects in the dataset

impl Debug for InMemoryDataset

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

Formats the value using the given formatter.

impl Default for InMemoryDataset

fn default() -> InMemoryDataset

Returns the “default value” for a type.