Struct ConcatPF 

pub struct ConcatPF { /* private fields */ }

apf:concat - Concatenate multiple string arguments.

Usage: (?a ?b ?c) apf:concat ?result

Implementations

impl ConcatPF

pub fn new() -> Self

Trait Implementations

impl Debug for ConcatPF

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

Formats the value using the given formatter.

impl Default for ConcatPF

fn default() -> Self

Returns the “default value” for a type.

impl PropertyFunction for ConcatPF

fn metadata(&self) -> PropertyFunctionMetadata

Return metadata describing this property function.

fn evaluate( &self, subject: &PropertyFunctionArg, _object: &PropertyFunctionArg, ) -> Result<PropertyFunctionResult, OxirsError>

Evaluate the property function given the subject and object arguments.

fn estimated_cardinality( &self, _subject: &PropertyFunctionArg, _object: &PropertyFunctionArg, ) -> Option<u64>

Estimated cardinality of results (for query planning). Returns None if unknown. Default is None.

fn validate( &self, subject: &PropertyFunctionArg, object: &PropertyFunctionArg, ) -> Result<(), OxirsError>

Validate arguments before evaluation (optional override).