Evaluator class

An Evaluator instance updates its children nodes as an unordered sequence. Composite child nodes will be updated until they return Status.success, then they are ignored in any future calls update() method of the Evaluator until all other children nodes have returned Status.success.

The Evaluator will only call reset() on children Node instances that have not yet evaluated to one of the accepted Status values. By default, only children nodes that return Status.success are considered as evaluated.

Example:

void evaluatorExample() {
  final random = Random();

  final randomSuccess0 = Closure(() {
    if (random.nextDouble() > 0.95) {
      print('rs0');
      return Status.success;
    }
    return Status.failure;
  });

  final randomSuccess1 = Closure(() {
    if (random.nextDouble() > 0.95) {
      print('rs1');
      return Status.success;
    }
    return Status.failure;
  });

  final evaluator = Sequence([
    Evaluator([
      Identity.success,
      randomSuccess0,
      randomSuccess1
    ]),
    Print('evaluator finished'),
  ], isPartial: false);

  while (evaluator.update() != Status.success) {}
  // sometimes prints rs0, then rs1
  // sometimes prints rs1, then rs0
}

Inheritance

• Object
• Node
• Composite
• Evaluator

Constructors

Evaluator(List<Node> nodes, {List<Status> accepted = const <Status>[Status.success]})

Constructs an Evaluator instance.

Properties

hashCode → int

The hash code for this object.

no setter, inherited

index → int

Index of the current Node of the Composite. The value should represent the index of the child Node that is in execution. The index is not guaranteed to be inside the bounds of the List that holds the children Node instances of the Composite.

no setter, inherited

length → int

Count of the number of Node instances in the Composite.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

reset() → void

override

toString() → String

A string representation of this object.

inherited

update() → Status

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited

operator [](int index) → Node

Indexes into the List of children Node instances.

inherited