build method

TreeNode build(
  1. TreeBuildContext context
)

Implementation

TreeNode build(TreeBuildContext context) {
  _validate();

  var rootBuilders = _stateBuilders.values.where((b) => b._stateType == _StateType.root).toList();
  if (rootBuilders.isEmpty) {
    throw StateError('No root builders available');
  } else if (rootBuilders.length > 1) {
    throw StateError('Found multiple root nodes.');
  }

  // If there is a single root, then we have a well formed state tree.
  return rootBuilders.first._toNode(context, _stateBuilders);
}