return parent.toString();
        }
    }

    public void setSeacher(final RankFusionSearcher searcher) {
        this.searchers[0] = searcher;
    }

    public void register(final RankFusionSearcher searcher) {
        if (logger.isDebugEnabled()) {
            logger.debug("Load {}", searcher.getClass().getSimpleName());
        }