protected String getHostKey(final RelatedContent entity) {
        final String key = entity.getVirtualHost();
        return StringUtil.isBlank(key) ? StringUtil.EMPTY : key;
    }

    public String[] getRelatedContents(final String query) {
        final String key = ComponentUtil.getVirtualHostHelper().getVirtualHostKey();
        final Pair<Map<String, String>, List<Pair<Pattern, String>>> pair = relatedContentMap.get(key);