[−][src]Trait terminus_store::layer::LayerSubjectPredicateLookup

pub trait LayerSubjectPredicateLookup {
    fn subject(&self) -> u64;
    fn predicate(&self) -> u64;
    fn objects(&self) -> Box<dyn Iterator<Item = u64>>;
    fn has_object(&self, object: u64) -> bool;

    fn triples(&self) -> Box<dyn Iterator<Item = IdTriple>> { ... }
    fn triple(&self, object: u64) -> Option<IdTriple> { ... }
}

a trait that caches a lookup in a layer by subject and predicate, but only for that layer and not its parents.

This is returned by SubjectLookup::predicates and SubjectLookup::lookup_predicate. It stores slices of the relevant data structures to allow quick retrieval of objects when one already knows the subject and predicate.

Required methods

`fn subject(&self) -> u64`

The subject that this lookup is based on.

`fn predicate(&self) -> u64`

The predicate that this lookup is based on.

`fn objects(&self) -> Box<dyn Iterator<Item = u64>>`

Returns an iterator over all objects that can be found by this lookup.

`fn has_object(&self, object: u64) -> bool`

Returns true if the given object exists, and false otherwise.

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Provided methods

`fn triples(&self) -> Box<dyn Iterator<Item = IdTriple>>`

Returns an iterator over all triples that can be found by this lookup.

`fn triple(&self, object: u64) -> Option<IdTriple>`

Returns a triple for the given object, or None if it doesn't exist.

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Implementors

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