public function retrieve($key, $default = '')
    {
        $retriever = $this->getService('retriever');
        if($retriever->has($key)){
            return $retriever->get($key);
        }
        return $default;
    }
public function retrieve($key, $default = '')
    {
        $retriever = $this->getService('retriever');
        if($retriever->has($key)){
            return $retriever->get($key);
        }
        return $default;
    }
public function retrieve ( $ key , $ default = '' ) { $ retriever = $ this -> getService ( 'retriever' ) ; if ( $ retriever -> has ( $ key ) ) { return $ retriever -> get ( $ key ) ; } return $ default ; }
retrieves a param from
- the matches of the uri
- the request
- the flash

@param string $key
@param string $default
@return string
retrieves a param from - the matches of the uri - the request - the flash