has method
Does an action exist in the state machine?
@param action The action in question. @return True if the action exists, false if it does not.
Implementation
bool has({String? action, String? state, bool conform = true}) {
var result = false;
bool stateActionExists = false;
bool stateNameExists = false;
if (action != null) {
stateActionExists = _findStateTransitionByAction(action) != null;
} else
stateActionExists = state != null;
if (state != null) {
stateNameExists = _findStateMetaByName(state) != null;
} else
stateNameExists = stateActionExists;
result = conform
? (stateActionExists && stateNameExists)
: (stateActionExists || stateNameExists);
return result;
}