Struct GraphQuery 

pub struct GraphQuery<V: GraphValue> {
    pub query_nodes: Rc<dyn Fn() -> Vec<Pattern<V>>>,
    pub query_relationships: Rc<dyn Fn() -> Vec<Pattern<V>>>,
    pub query_incident_rels: Rc<dyn Fn(&Pattern<V>) -> Vec<Pattern<V>>>,
    pub query_source: Rc<dyn Fn(&Pattern<V>) -> Option<Pattern<V>>>,
    pub query_target: Rc<dyn Fn(&Pattern<V>) -> Option<Pattern<V>>>,
    pub query_degree: Rc<dyn Fn(&Pattern<V>) -> usize>,
    pub query_node_by_id: Rc<dyn Fn(&V::Id) -> Option<Pattern<V>>>,
    pub query_relationship_by_id: Rc<dyn Fn(&V::Id) -> Option<Pattern<V>>>,
    pub query_containers: Rc<dyn Fn(&Pattern<V>) -> Vec<Pattern<V>>>,
}

Portable graph query interface: a struct of nine closures.

All graph algorithms operate against GraphQuery<V>, not against any specific backing representation. Cloning is cheap — it increments reference counts only.

Construction

Use crate::from_pattern_graph to wrap a crate::PatternGraph, or build manually by providing all nine closure fields.

Thread Safety

By default uses Rc (single-threaded). Enable the thread-safe Cargo feature to use Arc with Send + Sync bounds throughout.

Fields

query_nodes: Rc<dyn Fn() -> Vec<Pattern<V>>>

Returns all node patterns in the graph.

query_relationships: Rc<dyn Fn() -> Vec<Pattern<V>>>

Returns all relationship patterns in the graph.

query_incident_rels: Rc<dyn Fn(&Pattern<V>) -> Vec<Pattern<V>>>

Returns all relationships incident to the given node (as source or target).

query_source: Rc<dyn Fn(&Pattern<V>) -> Option<Pattern<V>>>

Returns the source node of a relationship, or None if not available.

query_target: Rc<dyn Fn(&Pattern<V>) -> Option<Pattern<V>>>

Returns the target node of a relationship, or None if not available.

query_degree: Rc<dyn Fn(&Pattern<V>) -> usize>

Returns the count of incident relationships for a node.

query_node_by_id: Rc<dyn Fn(&V::Id) -> Option<Pattern<V>>>

Returns the node with the given identity, or None.

query_relationship_by_id: Rc<dyn Fn(&V::Id) -> Option<Pattern<V>>>

Returns the relationship with the given identity, or None.

query_containers: Rc<dyn Fn(&Pattern<V>) -> Vec<Pattern<V>>>

Returns all direct containers of the given element (relationships, walks, annotations).

Trait Implementations

impl<V: GraphValue> Clone for GraphQuery<V>

Available on non-crate feature thread-safe only.

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.