Trait Activation 

pub trait Activation: Send + Sync {
    // Required method
    fn resolve(&self, name: &str) -> Option<Value>;

    // Provided method
    fn has(&self, name: &str) -> bool { ... }
}

Trait for resolving variable bindings during evaluation.

An activation provides the values for variables referenced in CEL expressions. Implementations can support simple key-value lookup, hierarchical scopes, or lazy evaluation.

Required Methods

fn resolve(&self, name: &str) -> Option<Value>

Resolve a variable name to its value.

Returns None if the variable is not defined in this activation.

Provided Methods

fn has(&self, name: &str) -> bool

Check if a variable is defined (present check for has() macro).

Default implementation returns true if resolve() returns Some.

Implementations on Foreign Types

impl<T: Activation + ?Sized> Activation for &T

fn resolve(&self, name: &str) -> Option<Value>

fn has(&self, name: &str) -> bool

impl<T: Activation> Activation for Box<T>

fn resolve(&self, name: &str) -> Option<Value>

fn has(&self, name: &str) -> bool

impl<T: Activation> Activation for Arc<T>

fn resolve(&self, name: &str) -> Option<Value>

fn has(&self, name: &str) -> bool

Implementors

impl Activation for EmptyActivation

impl Activation for HierarchicalActivation<'_>

impl Activation for MapActivation

impl Activation for SharedActivation