Struct LabelRegistry 

pub struct LabelRegistry { /* private fields */ }

Bidirectional label ↔ LabelId catalog with concurrent access.

Cloned cheaply via Arc<LabelRegistry> from GraphStore. Internally uses a single RwLock covering both directions of the map plus the next-id counter so that allocation + insertion is atomic.

Implementations

impl LabelRegistry

pub fn with_legacy_seed() -> LabelRegistry

New empty registry pre-seeded with legacy GraphNodeType and GraphEdgeType variant names so v1-format records decode into stable IDs without a separate migration step.

pub fn empty() -> LabelRegistry

New empty registry with no legacy seeding. Use only when callers do not need to decode v1 graph pages.

pub fn intern( &self, ns: Namespace, label: &str, ) -> Result<LabelId, LabelRegistryError>

Look up an existing label or allocate a new ID. Idempotent.

pub fn lookup(&self, ns: Namespace, label: &str) -> Option<LabelId>

Look up the ID for an existing label. None if not interned.

pub fn resolve(&self, id: LabelId) -> Option<(Namespace, String)>

Resolve an ID back to its (namespace, label). None for unknown or sentinel IDs.

pub fn label_of(&self, ns: Namespace, id: LabelId) -> Option<String>

Resolve an ID to just its label string, scoped to a namespace. Returns None if the ID belongs to a different namespace.

pub fn len(&self) -> usize

Total interned labels (across both namespaces, excludes sentinel).

pub fn is_empty(&self) -> bool

True if no labels have been interned.

pub fn legacy_node_label_id(disc: u8) -> LabelId

Translate a v1 GraphNodeType discriminant (0..=8) into the reserved LabelId it was seeded with. Returns UNSET_LABEL_ID for unknown discriminants (forward-compat).

pub fn legacy_edge_label_id(disc: u8) -> LabelId

Translate a v1 GraphEdgeType discriminant (0..=9) into the reserved LabelId it was seeded with.

pub fn encode(&self) -> Result<Vec<u8>, LabelRegistryError>

Serialize the catalog to a self-describing byte buffer. Format: [count: u32 LE]([id: u32 LE][ns: u8][len: u16 LE][label_bytes])*

pub fn decode(data: &[u8]) -> Result<LabelRegistry, LabelRegistryError>

Inverse of [encode]. Returns a fresh registry; the legacy seed is not re-applied (caller decides whether incoming bytes already contain the legacy entries).

Trait Implementations

impl Debug for LabelRegistry

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

Formats the value using the given formatter.

impl Default for LabelRegistry

fn default() -> LabelRegistry

Returns the “default value” for a type.