Struct oxrdf::dataset::GraphView

pub struct GraphView<'a> { /* private fields */ }

A read-only view on an RDF graph contained in a Dataset.

It is built using the Dataset::graph method.

Usage example:

use oxrdf::*;

let mut dataset = Dataset::default();
let ex = NamedNodeRef::new("http://example.com")?;
dataset.insert(QuadRef::new(ex, ex, ex, ex));

let results: Vec<_> = dataset.graph(ex).iter().collect();
assert_eq!(vec![TripleRef::new(ex, ex, ex)], results);

Implementations

impl<'a> GraphView<'a>

pub fn iter(&self) -> GraphViewIter<'a>

Returns all the triples contained by the graph.

pub fn triples_for_subject<'b>( &self, subject: impl Into<SubjectRef<'b>> ) -> impl Iterator<Item = TripleRef<'a>> + 'a

pub fn objects_for_subject_predicate<'b>( &self, subject: impl Into<SubjectRef<'b>>, predicate: impl Into<NamedNodeRef<'b>> ) -> impl Iterator<Item = TermRef<'a>> + 'a

pub fn object_for_subject_predicate<'b>( &self, subject: impl Into<SubjectRef<'b>>, predicate: impl Into<NamedNodeRef<'b>> ) -> Option<TermRef<'a>>

pub fn predicates_for_subject_object<'b>( &self, subject: impl Into<SubjectRef<'b>>, object: impl Into<TermRef<'b>> ) -> impl Iterator<Item = NamedNodeRef<'a>> + 'a

pub fn triples_for_predicate<'b>( &self, predicate: impl Into<NamedNodeRef<'b>> ) -> impl Iterator<Item = TripleRef<'a>> + 'a

pub fn subjects_for_predicate_object<'b>( &self, predicate: impl Into<NamedNodeRef<'b>>, object: impl Into<TermRef<'b>> ) -> impl Iterator<Item = SubjectRef<'a>> + 'a

pub fn subject_for_predicate_object<'b>( &self, predicate: impl Into<NamedNodeRef<'b>>, object: impl Into<TermRef<'b>> ) -> Option<SubjectRef<'a>>

pub fn triples_for_object<'b>( &self, object: impl Into<TermRef<'b>> ) -> impl Iterator<Item = TripleRef<'a>> + 'a

pub fn contains<'b>(&self, triple: impl Into<TripleRef<'b>>) -> bool

Checks if the graph contains the given triple.

pub fn len(&self) -> usize

Returns the number of triples in this graph.

pub fn is_empty(&self) -> bool

Checks if this graph contains a triple.

Trait Implementations

impl<'a> Clone for GraphView<'a>

fn clone(&self) -> GraphView<'a>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for GraphView<'a>

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

Formats the value using the given formatter.

impl<'a> Display for GraphView<'a>

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

Formats the value using the given formatter.

impl<'a, 'b> IntoIterator for &'b GraphView<'a>

type Item = TripleRef<'a>

The type of the elements being iterated over.

type IntoIter = GraphViewIter<'a>

Which kind of iterator are we turning this into?

fn into_iter(self) -> GraphViewIter<'a>

Creates an iterator from a value.

impl<'a> IntoIterator for GraphView<'a>

type Item = TripleRef<'a>

The type of the elements being iterated over.

type IntoIter = GraphViewIter<'a>

Which kind of iterator are we turning this into?

fn into_iter(self) -> GraphViewIter<'a>

Creates an iterator from a value.