src/NotFilter.php
public function filter(EventInterface $event)
    {
        $result = $this->filter->filter($event);
        if ($result === null) {
            return null;
        }
        return !$result;
    }
public function filter(EventInterface $event)
    {
        $result = $this->filter->filter($event);
        if ($result === null) {
            return null;
        }
        return !$result;
    }
public function filter ( EventInterface $ event ) { $ result = $ this -> filter -> filter ( $ event ) ; if ( $ result === null ) { return null ; } return ! $ result ; }
Filters events that do not pass the contained filter.

@param \Phergie\Irc\Event\EventInterface $event
@return boolean|null TRUE if the contained filter fails, FALSE if it passes,
or NULL if it returns NULL.
Filters events that do not pass the contained filter .