sqlitegraph 2.0.7

Embedded graph database with full ACID transactions, HNSW vector search, dual backend support, and comprehensive graph algorithms library
Documentation 
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//! V3 adjacency helpers for neighbor retrieval
//!
//! Minimal implementation for V3 backend - provides same interface as V2's
//! AdjacencyHelpers but without WAL reader parameter (V3 WAL integration
//! is deferred to Phase 65).
//!
//! This is a STUB implementation that returns empty neighbors/degrees. Full V3 neighbor
//! traversal will be implemented in Phase 66 (NodeStore V3) with B+Tree
//! lookup integration.

use crate::backend::native::types::{NativeBackendError, NativeNodeId, NativeResult};
use crate::snapshot::SnapshotId;

/// V3 adjacency helpers - stub until Phase 66
pub struct V3AdjacencyHelpers;

impl V3AdjacencyHelpers {
    /// Get outgoing neighbors - stub implementation
    ///
    /// TODO: Phase 66 will implement B+Tree-based neighbor lookup
    pub fn get_outgoing_neighbors(
        _graph_file: &crate::backend::native::graph_file::GraphFile,
        _node_id: NativeNodeId,
        _snapshot_id: SnapshotId,
    ) -> NativeResult<Vec<NativeNodeId>> {
        // Stub: return empty neighbor list
        // V3 doesn't have adjacency built yet - neighbors come from edge traversal
        // which requires full B+Tree index integration (Phase 66)
        Ok(Vec::new())
    }

    /// Get incoming neighbors - stub implementation
    ///
    /// TODO: Phase 66 will implement B+Tree-based neighbor lookup
    pub fn get_incoming_neighbors(
        _graph_file: &crate::backend::native::graph_file::GraphFile,
        _node_id: NativeNodeId,
        _snapshot_id: SnapshotId,
    ) -> NativeResult<Vec<NativeNodeId>> {
        // Stub: return empty neighbor list
        // V3 doesn't have adjacency built yet - neighbors come from edge traversal
        // which requires full B+Tree index integration (Phase 66)
        Ok(Vec::new())
    }

    /// Get outgoing degree - stub implementation
    ///
    /// TODO: Phase 66 will implement B+Tree-based degree lookup
    pub fn outgoing_degree(
        _graph_file: &crate::backend::native::graph_file::GraphFile,
        _node_id: NativeNodeId,
    ) -> NativeResult<usize> {
        // Stub: return 0 degree
        // V3 doesn't have adjacency built yet - degree comes from edge count
        // which requires full B+Tree index integration (Phase 66)
        Ok(0)
    }

    /// Get incoming degree - stub implementation
    ///
    /// TODO: Phase 66 will implement B+Tree-based degree lookup
    pub fn incoming_degree(
        _graph_file: &crate::backend::native::graph_file::GraphFile,
        _node_id: NativeNodeId,
    ) -> NativeResult<usize> {
        // Stub: return 0 degree
        // V3 doesn't have adjacency built yet - degree comes from edge count
        // which requires full B+Tree index integration (Phase 66)
        Ok(0)
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_v3_adjacency_stubs() {
        // Verify stub implementations compile and return empty/zero results
        let result = V3AdjacencyHelpers::get_outgoing_neighbors(
            &crate::backend::native::graph_file::GraphFile::placeholder(),
            1,
            crate::snapshot::SnapshotId::current(),
        );
        assert!(result.is_ok());
        assert!(result.unwrap().is_empty());

        let degree = V3AdjacencyHelpers::outgoing_degree(
            &crate::backend::native::graph_file::GraphFile::placeholder(),
            1,
        );
        assert!(degree.is_ok());
        assert_eq!(degree.unwrap(), 0);
    }
}