Trait rdftk_core::data_set::DataSet[−][src]

pub trait DataSet {

Show methods    fn is_empty(&self) -> bool;

    fn len(&self) -> usize;

    fn has_default_graph(&self) -> bool;

    fn default_graph(&self) -> Option<&GraphRef>;

    fn has_graph_named(&self, name: &GraphNameRef) -> bool;

    fn graph_named(&self, name: &GraphNameRef) -> Option<&GraphRef>;

    fn graphs<'a>(
        &'a self
    ) -> Box<dyn Iterator<Item = (&'a GraphNameRef, &'a GraphRef)> + 'a>;

    fn has_index(&self, index: &DataSetIndex) -> bool;

    fn set_default_graph(&mut self, graph: GraphRef);

    fn unset_default_graph(&mut self);

    fn insert(&mut self, name: GraphNameRef, graph: GraphRef);

    fn remove(&mut self, name: &GraphNameRef);

    fn clear(&mut self);

    fn factory(&self) -> DataSetFactoryRef;

    fn has_indices(&self, indices: &[DataSetIndex]) -> bool { ... }

}
Expand description

A DataSet is a mapping from GraphName to Graph; this introduces the notion of a named graph although in actuality the graph itself is not named as the name is the key within the data set. Note that this trait represents an immutable data set, a type should also implement the MutableDataSet trait for mutation.

Required methods

fn is_empty(&self) -> bool[src]

Returns true if there are no graphs in this data set, else false.

fn len(&self) -> usize[src]

Return the number of graphs in this data set.

fn has_default_graph(&self) -> bool[src]

Return true if this data set has a default graph, else false.

fn default_graph(&self) -> Option<&GraphRef>[src]

Return the default graph for this data set, if it exists.

fn has_graph_named(&self, name: &GraphNameRef) -> bool[src]

Return true if this data set has a graph with the provided name, else false.

fn graph_named(&self, name: &GraphNameRef) -> Option<&GraphRef>[src]

Return the graph with the provided name from this data set, if it exists.

fn graphs<'a>(
    &'a self
) -> Box<dyn Iterator<Item = (&'a GraphNameRef, &'a GraphRef)> + 'a>[src]

Return an iterator over graph name/graph pairs.

fn has_index(&self, index: &DataSetIndex) -> bool[src]

Returns true if this data set has an index of the specified kind, else false.

fn set_default_graph(&mut self, graph: GraphRef)[src]

Set the provided graph as the default, unnamed graph, for this data set. Only one graph may be the default.

fn unset_default_graph(&mut self)[src]

Remove any graph that may be set as the current default. This operation has no effect if no default graph is present.

fn insert(&mut self, name: GraphNameRef, graph: GraphRef)[src]

Insert a new graph with it’s associated name into the data set.

fn remove(&mut self, name: &GraphNameRef)[src]

Remove the graph with the provided name from this data set. This operation has no effect if no such graph is present.

fn clear(&mut self)[src]

Remove all graphs from this data set.

fn factory(&self) -> DataSetFactoryRef[src]

Return the factory that creates data sets of this kind.

Note that this uses Arc as a reference as factories are explicitly intended for cross-thread usage.

Provided methods

fn has_indices(&self, indices: &[DataSetIndex]) -> bool[src]

Returns true if this data set has *all the specified index kinds, else false.

Implementors