public function getExport($alias)
    {
        if (!array_key_exists($alias, $this->exports)) {
            throw new \RuntimeException("The export with alias $alias is not known.");
        }
        
        return $this->exports[$alias];
    }
public function getExport($alias)
    {
        if (!array_key_exists($alias, $this->exports)) {
            throw new \RuntimeException("The export with alias $alias is not known.");
        }
        
        return $this->exports[$alias];
    }
public function getExport ( $ alias ) { if ( ! array_key_exists ( $ alias , $ this -> exports ) ) { throw new \ RuntimeException ( "The export with alias $alias is not known." ) ; } return $ this -> exports [ $ alias ] ; }
Return an export by his alias

@param string $alias
@return ExportInterface
@throws \RuntimeException
Return an export by his alias