Struct EdgeCtx 

pub struct EdgeCtx<'a, S> { /* private fields */ }

Per-edge context passed to a Kernel.

Holds the current edge (src)-[edge]->(dest) and the relevant per-path state. Typed getters read node/edge Arrow payload columns by internal row id.

Implementations

impl<'a, S> EdgeCtx<'a, S>

pub fn with_state<'b>(&'b self, state: &'b S) -> EdgeCtx<'b, S>

Returns a context borrowing state in place of the current one.

Mirrors the DSL’s with_state; used to evaluate stop against the child state produced by next_state.

pub fn graph(&self) -> &'a Graph

The graph being traversed.

pub fn src(&self) -> NodeId

Internal id of the edge’s source node.

pub fn dest(&self) -> NodeId

Internal id of the edge’s destination node.

pub fn edge(&self) -> EdgeId

Internal id of the current edge.

pub fn state(&self) -> &S

The per-path state.

pub fn src_id(&self) -> Option<GraphId<'a>>

External id of the source node, if present.

pub fn dest_id(&self) -> Option<GraphId<'a>>

External id of the destination node, if present.

pub fn edge_id(&self) -> Option<GraphId<'a>>

External id of the current edge, if present.

pub fn src_value(&self, col: &str) -> Result<Value>

Reads node payload column col for the source node.

pub fn dest_value(&self, col: &str) -> Result<Value>

Reads node payload column col for the destination node.

pub fn edge_value(&self, col: &str) -> Result<Value>

Reads edge payload column col for the current edge.

pub fn src_u64(&self, col: &str) -> Result<Option<u64>>

Source node payload col as u64.

Coerces from integer/float when lossless; Ok(None) if null. Errors on negative or non-integral values.

pub fn dest_u64(&self, col: &str) -> Result<Option<u64>>

Destination node payload col as u64.

Coerces from integer/float when lossless; Ok(None) if null. Errors on negative or non-integral values.

pub fn edge_u64(&self, col: &str) -> Result<Option<u64>>

Edge payload col as u64.

Coerces from integer/float when lossless; Ok(None) if null. Errors on negative or non-integral values.

pub fn src_i64(&self, col: &str) -> Result<Option<i64>>

Source node payload col as i64.

Coerces from integer/float when lossless; Ok(None) if null. Errors on out-of-range or non-integral values.

pub fn dest_i64(&self, col: &str) -> Result<Option<i64>>

Destination node payload col as i64.

Coerces from integer/float when lossless; Ok(None) if null. Errors on out-of-range or non-integral values.

pub fn edge_i64(&self, col: &str) -> Result<Option<i64>>

Edge payload col as i64.

Coerces from integer/float when lossless; Ok(None) if null. Errors on out-of-range or non-integral values.

pub fn src_f64(&self, col: &str) -> Result<Option<f64>>

Source node payload col as f64.

Coerces from any numeric type; Ok(None) if null.

pub fn dest_f64(&self, col: &str) -> Result<Option<f64>>

Destination node payload col as f64.

Coerces from any numeric type; Ok(None) if null.

pub fn edge_f64(&self, col: &str) -> Result<Option<f64>>

Edge payload col as f64.

Coerces from any numeric type; Ok(None) if null.

pub fn src_bool(&self, col: &str) -> Result<Option<bool>>

Source node payload col as bool. Ok(None) if null.

pub fn dest_bool(&self, col: &str) -> Result<Option<bool>>

Destination node payload col as bool. Ok(None) if null.

pub fn edge_bool(&self, col: &str) -> Result<Option<bool>>

Edge payload col as bool. Ok(None) if null.

pub fn src_str(&self, col: &str) -> Result<Option<String>>

Source node payload col as String. Ok(None) if null.

pub fn dest_str(&self, col: &str) -> Result<Option<String>>

Destination node payload col as String. Ok(None) if null.

pub fn edge_str(&self, col: &str) -> Result<Option<String>>

Edge payload col as String. Ok(None) if null.