Function has_content

atomic-core/src/record/workflow/retrieve.rs:279–297

Check if a position has any content. This is a lighter-weight check than full retrieval, useful for quickly determining if a file exists in the graph. # Arguments `txn` - Transaction providing graph access `changes` - Change store for content retrieval `position` - Position to check # Returns `true` if the position has content vertices.

(txn: &T, changes: &C, position: Position<NodeId>)

///
/// `true` if the position has content vertices.
pub fn has_content<T, C>(txn: &T, changes: &C, position: Position<NodeId>) -> RecordResult<bool>
where
    T: GraphTxnT,
    C: ChangeStore,
{
    if position == Position::ROOT {
        return Ok(false);
    }

    // Try to retrieve content - if we get anything, it has content
    let opts = RetrieveContentOptions::new().max_vertices(1);
    match retrieve_content_with_options(txn, changes, position, opts) {
        Ok(result) => Ok(!result.is_empty()),
        Err(RecordError::Pristine(e)) if matches!(*e, PristineError::BlockNotFound { .. }) => {
            Ok(false)
        }
        Err(e) => Err(e),
    }
}

// STATE-BASED CONTENT RETRIEVAL