Struct VidLabelsIndex 

pub struct VidLabelsIndex { /* private fields */ }

In-memory index mapping VIDs to their labels.

This index is rebuilt from the main vertex table on database open. It provides O(1) lookups for:

• VID → labels (which labels does this vertex have?)
• label → VIDs (which vertices have this label?)

Implementations

impl VidLabelsIndex

pub fn new() -> VidLabelsIndex

Creates a new empty index.

pub fn with_capacity(num_vertices: usize, num_labels: usize) -> VidLabelsIndex

Creates an index with pre-allocated capacity.

pub fn insert(&mut self, vid: Vid, labels: Vec<String>)

Inserts a VID with its labels.

If the VID already exists, its labels are replaced.

pub fn add_label(&mut self, vid: Vid, label: String)

Adds a label to an existing VID.

If the VID doesn’t exist, creates it with just this label.

pub fn remove_label(&mut self, vid: Vid, label: &str) -> bool

Removes a label from a VID.

Returns true if the label was removed, false if it wasn’t present.

pub fn remove_vid(&mut self, vid: Vid)

Removes a VID entirely from the index.

pub fn get_labels(&self, vid: Vid) -> Option<&[String]>

Gets the labels for a VID.

pub fn has_label(&self, vid: Vid, label: &str) -> bool

Checks if a VID has a specific label.

pub fn has_all_labels(&self, vid: Vid, required_labels: &[&str]) -> bool

Checks if a VID has all the specified labels.

pub fn get_vids_with_label(&self, label: &str) -> Option<&HashSet<Vid>>

Gets all VIDs with a specific label.

pub fn get_vids_with_all_labels(&self, labels: &[&str]) -> HashSet<Vid>

Gets all VIDs that have ALL the specified labels.

pub fn len(&self) -> usize

Returns the total number of vertices in the index.

pub fn is_empty(&self) -> bool

Returns true if the index is empty.

pub fn label_count(&self) -> usize

Returns the number of distinct labels.

pub fn labels(&self) -> impl Iterator<Item = &str>

Returns an iterator over all known labels.

pub fn iter(&self) -> impl Iterator<Item = (Vid, &[String])>

Returns an iterator over all (VID, labels) pairs.

pub fn clear(&mut self)

Clears the index.

pub fn memory_usage(&self) -> usize

Approximate memory usage in bytes.

Trait Implementations

impl Clone for VidLabelsIndex

fn clone(&self) -> VidLabelsIndex

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VidLabelsIndex

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

Formats the value using the given formatter.

impl Default for VidLabelsIndex

fn default() -> VidLabelsIndex

Returns the “default value” for a type.