EvaluationContext.immutable constructor

EvaluationContext.immutable({ String? targetingKey, Map<String, dynamic> attributes = const {}, EvaluationContext? parent, List<TargetingRule> rules = const [], Duration cacheDuration = const Duration(minutes: 5), })

Copies and freezes evaluation fields, including nested maps/lists. Rule operands outside maps/lists are retained by reference; callers must keep custom mutable operands stable for the lifetime of the snapshot. The map-form targetingKey is a compatibility alias for targetingKey; an explicit argument takes precedence at the same context level.

Implementation

factory EvaluationContext.immutable({
  String? targetingKey,
  Map<String, dynamic> attributes = const {},
  EvaluationContext? parent,
  List<TargetingRule> rules = const [],
  Duration cacheDuration = const Duration(minutes: 5),
}) {
  final mapKey = attributes['targetingKey'];
  if (attributes.containsKey('targetingKey') && mapKey is! String) {
    throw InvalidContextException('attributes.targetingKey must be a string');
  }
  final localKey = targetingKey ?? mapKey as String?;
  final copied = snapshotContextMap({
    ...attributes,
    if (localKey != null) 'targetingKey': localKey,
  });
  return EvaluationContext._snapshot(
    targetingKey: localKey,
    attributes: copied,
    parent: parent?.snapshot(),
    rules: _snapshotRules(rules, HashSet<TargetingRule>.identity(), 'rules'),
    cacheDuration: cacheDuration,
  );
}