# Additional parameters for events

As the second argument, StateMachine#apply and StateMachine#test will accept an array of properties to be passed
to the dispatched event, and accessible by the listeners.

Default properties can be defined with your state graph.

```php
$stateManager->apply('some_event', array('something' => $value));
```

In your listeners you just have to call ```$event->getProperties()``` to access the passed data.

```php
<?php

namespace My\AwesomeBundle\EventListener;

use Finite\Event\TransitionEvent;

class TransitionListener
{
    /**
     * @param TransitionEvent $event
     */
    public function someEvent(TransitionEvent $event)
    {
        $entity = $event->getStateMachine()->getObject();
        $params = $event->getProperties();

        $entity->setSomething($params['something']);
    }
}
```

**TIP:** Default properties

```php

'transitions' => array(
    'finish'    => array(
        'from' => array('middle'),
        'to'   => 'end',
        'properties' => array('foo' => 'bar'),
        'configure_properties' => function (OptionsResolver $resolver) {
            $resolver->setRequired('baz');
        }
    )
)
```