public function setOutput( OutputInterface $output ) {
		$this->output = $output;

		if ( $output->isDebug() ) {
			$this->verbosity = 3;
		} elseif ( $output->isVeryVerbose() ) {
			$this->verbosity = 2;
		} elseif ( $output->isVerbose() ) {
			$this->verbosity = 1;
		}
	}