public void addQuery(final String s) {
        if (query == null) {
            query = new String[] { s };
        } else {
            final String[] newQuery = Arrays.copyOf(query, query.length + 1);
            newQuery[query.length] = s;
            query = newQuery;
        }
        if (logger.isDebugEnabled()) {
            logger.debug("loaded facet query: {}", s);
        }
    }

    @Override