build method

StateDefinition<State> build()

Implementation

StateDefinition build() {
  if (_stateDefinition.isLeaf) {
    _initialState = _stateDefinition.stateType;
    return _stateDefinition;
  } else {
    /// If no initial state then the first state is the initial state.
    if (_initialState == _UndefinedInitialState &&
        _stateDefinition.childStateDefinitions.isNotEmpty) {
      _initialState = _stateDefinition.childStateDefinitions[0].stateType;
    }

    assert(_initialState != _UndefinedInitialState, 'unexpeted state');
    final sd = _stateDefinition.findStateDefintion(_initialState,
        includeChildren: false);
    if (sd == null) {
      throw InvalidInitialStateException(
          '''The initialState $_initialState MUST be a child state of ${_stateDefinition.stateType}.''');
    }

    _stateDefinition.initialState = _initialState;

    return _stateDefinition;
  }
}