Struct FunctionRegistry 

pub struct FunctionRegistry { /* private fields */ }

The host functions of a store, by IRI.

Implementations

impl FunctionRegistry

pub fn new() -> FunctionRegistry

pub fn register(&mut self, function: HostFunction) -> Result<(), Error>

Adds a function, replacing one with the same IRI. Fails on an invalid or reserved IRI, and on a Cypher name another function already uses.

pub fn unregister(&mut self, iri: &str) -> bool

Removes a function; false when none has this IRI.

pub fn get(&self, iri: &str) -> Option<&HostFunction>

pub fn by_cypher_name(&self, name: &str) -> Option<&HostFunction>

The function Cypher calls name (case-insensitive).

pub fn iter(&self) -> impl Iterator<Item = &HostFunction>

pub fn is_empty(&self) -> bool

pub fn len(&self) -> usize

pub fn install(&self, evaluator: QueryEvaluator) -> QueryEvaluator

Adds every function to a spareval evaluator.

Trait Implementations

impl Clone for FunctionRegistry

fn clone(&self) -> FunctionRegistry

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FunctionRegistry

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

Formats the value using the given formatter.

impl Default for FunctionRegistry

fn default() -> FunctionRegistry

Returns the “default value” for a type.