toString method

@override String toString()

A string representation of this object.

Some classes have a default textual representation, often paired with a static parse function (like int.parse). These classes will provide the textual representation as their string representation.

Other classes have no meaningful textual representation that a program will care about. Such classes will typically override toString to provide useful information when inspecting the object, mainly for debugging or logging.

Implementation

@override
String toString() {
  if (alternatives.isNotEmpty) {
    return 'the first provider of the $role, which $requiredBy; a run '
        'asks which one, also offering ${alternatives.join(', ')}';
  }
  return chosen
      ? 'chosen to provide the $role, which $requiredBy'
      : 'the only provider of the $role, which $requiredBy';
}