Struct Condition 

pub struct Condition {
    pub expression: ConditionExpression,
    pub operator: Operator,
    pub value: Value,
    /* private fields */
}

Represents a single condition in a rule

Fields

expression: ConditionExpression

The expression to evaluate (field or function call)

operator: Operator

The comparison operator to use

value: Value

The value to compare against

Implementations

impl Condition

pub fn new(field: String, operator: Operator, value: Value) -> Self

Create a new condition with a field reference

pub fn with_function( function_name: String, args: Vec<String>, operator: Operator, value: Value, ) -> Self

Create a new condition with a function call

pub fn with_test(function_name: String, args: Vec<String>) -> Self

Create a new Test CE condition The function must return a boolean value

pub fn with_multifield_collect(field: String, variable: String) -> Self

Create multi-field collect condition Example: Order.items $?all_items

pub fn with_multifield_count( field: String, operator: Operator, value: Value, ) -> Self

Create multi-field count condition Example: Order.items count > 0

pub fn with_multifield_first(field: String, variable: Option<String>) -> Self

Create multi-field first condition Example: Queue.tasks first $first_task

pub fn with_multifield_last(field: String, variable: Option<String>) -> Self

Create multi-field last condition Example: Queue.tasks last $last_task

pub fn with_multifield_empty(field: String) -> Self

Create multi-field empty condition Example: ShoppingCart.items empty

pub fn with_multifield_not_empty(field: String) -> Self

Create multi-field not_empty condition Example: ShoppingCart.items not_empty

pub fn evaluate(&self, facts: &HashMap<String, Value>) -> bool

Evaluate this condition against the given facts

pub fn evaluate_with_engine( &self, facts: &HashMap<String, Value>, function_registry: &HashMap<String, Arc<dyn Fn(Vec<Value>, &HashMap<String, Value>) -> Result<Value> + Send + Sync>>, ) -> bool

Evaluate condition with access to engine’s function registry This is needed for function call evaluation

Trait Implementations

impl Clone for Condition

fn clone(&self) -> Condition

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Condition

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

Formats the value using the given formatter.