/**
* Returns the key to use to store the action involving application of an
* input to a given state internally.
*
* @param State $currentState
* @param Input $input
*
* @return string
*/
private function getActionKey(State $currentState, Input $input) : string
{
return sprintf('%s | %s', $currentState->getName(), $input->getName());
}
/**
* Prepares exception message that includes the invalid input and state
*
* @param Input $input
* @param State $state
*/
public function __construct(Input $input, State $state)
{
$this->input = $input;
$this->state = $state;
parent::__construct(sprintf('Cannot %s a %s object', $input->getName(), $state->getName()));
}
/**
* {@inheritdoc}
*
*/
public function getCurrentStateName() : string
{
$this->assertHasCurrentState();
return $this->currentState->getName();
}
/**
* Creates an event name based on an input, current state, and when that event should be emitted
*
* @param string $executedWhen
* @param Input $input
* @param State $currentState
*
* @return string
*/
private function getEventName(string $executedWhen, Input $input, State $currentState) : string
{
return sprintf('%s %s %s', $executedWhen, $input->getName(), $currentState->getName());
}