oxigraph::model

Struct Dataset

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pub struct Dataset { /* private fields */ }
Expand description

An in-memory RDF dataset.

It can accommodate a fairly large number of quads (in the few millions).

It interns the strings and does not do any garbage collection yet: if you insert and remove a lot of different terms, memory will grow without any reduction.

Usage example:

use oxrdf::*;

let mut dataset = Dataset::default();

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

// simple filter
let results: Vec<_> = dataset.quads_for_subject(ex).collect();
assert_eq!(vec![quad], results);

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

Implementations§

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impl Dataset

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pub fn new() -> Dataset

Creates a new dataset

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pub fn graph<'a, 'b>( &'a self, graph_name: impl Into<GraphNameRef<'b>>, ) -> GraphView<'a>

Provides a read-only view on an RDF graph contained in this dataset.

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);
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pub fn graph_mut<'a, 'b>( &'a mut self, graph_name: impl Into<GraphNameRef<'b>>, ) -> GraphViewMut<'a>

Provides a read/write view on an RDF graph contained in this dataset.

use oxrdf::*;

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

// We edit and query the dataset http://example.com graph
{
    let mut graph = dataset.graph_mut(ex);
    graph.insert(TripleRef::new(ex, ex, ex));
    let results: Vec<_> = graph.iter().collect();
    assert_eq!(vec![TripleRef::new(ex, ex, ex)], results);
}

// We have also changes the dataset itself
let results: Vec<_> = dataset.iter().collect();
assert_eq!(vec![QuadRef::new(ex, ex, ex, ex)], results);
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pub fn iter(&self) -> Iter<'_>

Returns all the quads contained by the dataset.

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

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

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

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pub fn quads_for_graph_name<'a, 'b>( &'a self, graph_name: impl Into<GraphNameRef<'b>>, ) -> impl Iterator<Item = QuadRef<'a>> + 'a

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pub fn contains<'a>(&self, quad: impl Into<QuadRef<'a>>) -> bool

Checks if the dataset contains the given quad

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pub fn len(&self) -> usize

Returns the number of quads in this dataset.

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pub fn is_empty(&self) -> bool

Checks if this dataset contains a quad.

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pub fn insert<'a>(&mut self, quad: impl Into<QuadRef<'a>>) -> bool

Adds a quad to the dataset.

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pub fn remove<'a>(&mut self, quad: impl Into<QuadRef<'a>>) -> bool

Removes a concrete quad from the dataset.

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pub fn clear(&mut self)

Clears the dataset.

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pub fn canonicalize(&mut self, algorithm: CanonicalizationAlgorithm)

Canonicalizes the dataset by renaming blank nodes.

Usage example (Dataset isomorphism):

use oxrdf::dataset::CanonicalizationAlgorithm;
use oxrdf::*;

let iri = NamedNodeRef::new("http://example.com")?;

let mut graph1 = Graph::new();
let bnode1 = BlankNode::default();
let g1 = BlankNode::default();
graph1.insert(QuadRef::new(iri, iri, &bnode1, &g1));
graph1.insert(QuadRef::new(&bnode1, iri, iri, &g1));

let mut graph2 = Graph::new();
let bnode2 = BlankNode::default();
let g2 = BlankNode::default();
graph2.insert(QuadRef::new(iri, iri, &bnode2, &g2));
graph2.insert(QuadRef::new(&bnode2, iri, iri, &g2));

assert_ne!(graph1, graph2);
graph1.canonicalize(CanonicalizationAlgorithm::Unstable);
graph2.canonicalize(CanonicalizationAlgorithm::Unstable);
assert_eq!(graph1, graph2);
Blank node ids depends on the current shape of the graph. Adding a new quad might change the ids of a lot of blank nodes. Hence, this canonization might not be suitable for diffs.
This implementation worst-case complexity is in *O(b!)* with *b* the number of blank nodes in the input dataset.
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pub fn canonicalize_blank_nodes( &self, algorithm: CanonicalizationAlgorithm, ) -> HashMap<BlankNodeRef<'_>, BlankNode>

Returns a map between the current dataset blank node and the canonicalized blank node to create a canonical dataset.

See also canonicalize.

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impl Clone for Dataset

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fn clone(&self) -> Dataset

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Dataset

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

Formats the value using the given formatter. Read more
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impl Default for Dataset

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fn default() -> Dataset

Returns the “default value” for a type. Read more
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impl Display for Dataset

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

Formats the value using the given formatter. Read more
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impl Extend<Quad> for Dataset

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fn extend<I>(&mut self, iter: I)
where I: IntoIterator<Item = Quad>,

Extends a collection with the contents of an iterator. Read more
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fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)
Extends a collection with exactly one element.
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fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)
Reserves capacity in a collection for the given number of additional elements. Read more
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impl<'a, T> Extend<T> for Dataset
where T: Into<QuadRef<'a>>,

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fn extend<I>(&mut self, iter: I)
where I: IntoIterator<Item = T>,

Extends a collection with the contents of an iterator. Read more
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fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)
Extends a collection with exactly one element.
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fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)
Reserves capacity in a collection for the given number of additional elements. Read more
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impl FromIterator<Quad> for Dataset

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fn from_iter<I>(iter: I) -> Dataset
where I: IntoIterator<Item = Quad>,

Creates a value from an iterator. Read more
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impl<'a, T> FromIterator<T> for Dataset
where T: Into<QuadRef<'a>>,

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fn from_iter<I>(iter: I) -> Dataset
where I: IntoIterator<Item = T>,

Creates a value from an iterator. Read more
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impl<'a> IntoIterator for &'a Dataset

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type Item = QuadRef<'a>

The type of the elements being iterated over.
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type IntoIter = Iter<'a>

Which kind of iterator are we turning this into?
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fn into_iter(self) -> <&'a Dataset as IntoIterator>::IntoIter

Creates an iterator from a value. Read more
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impl PartialEq for Dataset

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fn eq(&self, other: &Dataset) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Eq for Dataset

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V